ADEX Dental Hygiene Exam — Questions and Answers

Question 1: Which local anesthetic is unique in that it is the only amide with an ester side chain, allowing partial metabolism in the plasma by pseudocholinesterases?

Bupivacaine
Lidocaine
Mepivacaine
Articaine (Correct answer)

Correct answer: Articaine

Articaine contains a thiophene ring and a supplementary ester linkage, enabling approximately 90% of the drug to be hydrolyzed in plasma, reducing hepatic load.

Question 2: Which of the following best describes the purpose of using a periodontal risk assessment tool during a patient assessment?

To calculate the patient's plaque index score for documentation
To determine the exact number of appointments needed for debridement
To select the appropriate ultrasonic tip for subgingival debridement
To identify factors that influence disease susceptibility and guide recall frequency (Correct answer)

Correct answer: To identify factors that influence disease susceptibility and guide recall frequency

Periodontal risk assessment evaluates factors such as BOP, pocket depth, bone loss, smoking, and systemic disease to tailor prevention and recall intervals.

Question 3: The temporomandibular joint (TMJ) is classified as which type of synovial joint?

Ball-and-socket joint
Pure gliding (arthrodial) joint only
Ginglymoarthrodial (combined hinge and gliding) joint (Correct answer)
Pure hinge (ginglymus) joint only

Correct answer: Ginglymoarthrodial (combined hinge and gliding) joint

The TMJ is a ginglymoarthrodial joint capable of both rotational (hinge) movement in the lower joint space and translational (gliding) movement in the upper joint space, separated by the articular disc.

Question 4: Which of the following is classified as 'Other Potentially Infectious Material' (OPIM) under the OSHA BBP Standard?

Sweat and tears
Intact skin contact with blood
Patient's clothing
Saliva in dental settings (Correct answer)

Correct answer: Saliva in dental settings

Under the OSHA BBP Standard, saliva in dental settings is specifically listed as OPIM due to the potential for blood contamination.

Question 5: What kind of education are dental hygienists expected to have?

Medical trauma rescue
Medical emergency management
Cardiopulmonary resuscitation
Medical emergency management and cardiopulmonary resuscitation (Correct answer)

Correct answer: Medical emergency management and cardiopulmonary resuscitation

Dental hygienists are expected to be proficient in both medical emergency management and cardiopulmonary resuscitation (CPR). This comprehensive training ensures they can effectively respond to life-threatening situations that may arise in a dental office, such as anaphylaxis, syncope, or cardiac arrest. Their ability to act quickly and competently in emergencies is crucial for patient safety and well-being.

Question 6: Which property describes a material's ability to withstand repeated loading without fracturing?

Elastic modulus
Fatigue resistance (Correct answer)
Toughness
Hardness

Correct answer: Fatigue resistance

Fatigue resistance is a material's ability to endure cyclic or repeated stresses over time without failure.

Question 7: The mandibular first molar typically has how many roots?

2 (Correct answer)
3
4
1

Correct answer: 2

The mandibular first molar normally has two roots: a mesial and a distal root, each containing canals.

Question 8: When educating a patient about the Bass toothbrushing technique, what is the correct angulation of the brush to the long axis of the tooth?

30 degrees
0 degrees (parallel)
45 degrees (Correct answer)
90 degrees (perpendicular)

Correct answer: 45 degrees

The Bass technique requires placing the brush at a 45-degree angle to the long axis of the tooth to direct bristles into the sulcus.

Question 9: Which of the following best describes the radiographic appearance of a dentigerous (follicular) cyst?

Diffuse radiopacity within the follicle of an unerupted tooth
Ill-defined radiolucency with ragged borders at an impacted tooth apex
Multilocular radiolucency surrounding the root of an erupted tooth
Well-defined unilocular radiolucency attached at the CEJ surrounding the crown of an impacted tooth (Correct answer)

Correct answer: Well-defined unilocular radiolucency attached at the CEJ surrounding the crown of an impacted tooth

A dentigerous cyst presents as a well-defined, corticated unilocular radiolucency that attaches at the cemento-enamel junction surrounding the crown of an unerupted tooth.

Question 10: A dental hygienist recaps a needle using the one-hand scoop technique. This practice is intended to:

Speed up instrument turnover
Reduce the risk of needlestick injury (Correct answer)
Eliminate the need for a sharps container
Allow reuse of disposable needles

Correct answer: Reduce the risk of needlestick injury

The one-hand scoop technique keeps the non-dominant hand away from the needle, significantly reducing the risk of an accidental needlestick.

Question 11: Which Gracey curette is specifically designed for scaling the distobuccal and distolingual surfaces of posterior teeth?

Gracey 13/14 (Correct answer)
Gracey 11/12
Gracey 1/2
Gracey 7/8

Correct answer: Gracey 13/14

The Gracey 13/14 is area-specific for the distal surfaces of posterior teeth.

Question 12: An anxious 18-year-old patient begins breathing rapidly and complains of tingling in their fingers and feeling lightheaded. The most appropriate initial management is to:

Administer oxygen via a face mask.
Place the patient in a supine position and elevate their legs.
Attempt to calm the patient and coach them to slow their breathing rate. (Correct answer)
Have the patient breathe into a paper bag.

Correct answer: Attempt to calm the patient and coach them to slow their breathing rate.

The patient is hyperventilating, which is causing an excessive loss of carbon dioxide. The primary treatment is to calm the patient and help them control their breathing rate. Administering oxygen can worsen the respiratory alkalosis. Breathing into a paper bag is no longer recommended due to the risk of significant hypoxia and misdiagnosis.

Question 13: Which of the following findings during an oral cancer screening warrants biopsy referral rather than a 2-week monitoring period?

A white lesion on the lateral tongue that cannot be wiped off (Correct answer)
A red area on the soft palate following recent denture trauma
A 4mm aphthous ulcer on the buccal mucosa
Fordyce granules scattered on the buccal mucosa

Correct answer: A white lesion on the lateral tongue that cannot be wiped off

A white lesion (leukoplakia) on the lateral tongue that cannot be wiped off may represent dysplasia or carcinoma and warrants biopsy referral.

Question 14: What is the role of an oxygen inhibition layer on the surface of a light-cured composite restoration?

It prevents post-cure shrinkage from occurring at the surface
It protects the restoration from staining during the first 24 hours
It acts as a lubricant to aid polishing procedures immediately after cure
It is an incompletely polymerized tacky surface layer that can bond subsequent increments or veneers (Correct answer)

Correct answer: It is an incompletely polymerized tacky surface layer that can bond subsequent increments or veneers

Oxygen inhibits polymerization at the composite surface, leaving a thin uncured layer that is advantageous for bonding additional increments or veneers chemically.

Question 15: A dental hygienist notices tissue tags remaining after scaling. The MOST appropriate next step is to:

Use a curette to remove the detached tissue tags (Correct answer)
Re-probe the area at the next appointment
Apply chlorhexidine and dismiss the patient
Perform root planing to smooth the root surface

Correct answer: Use a curette to remove the detached tissue tags

Residual tissue tags should be removed with a curette as part of thorough debridement.

Question 16: A patient with a known peanut allergy develops generalized urticaria and throat tightness five minutes after receiving a topical anesthetic. Which drug should be administered first?

Albuterol inhaler
Epinephrine 1:1000 IM (Correct answer)
Diphenhydramine (Benadryl) IM
Hydrocortisone IV

Correct answer: Epinephrine 1:1000 IM

Epinephrine 1:1000 administered IM into the mid-outer thigh is the first-line treatment for anaphylaxis because it reverses airway obstruction and hypotension rapidly.

Question 17: Which term describes bone loss that occurs equally on the mesial and distal aspects of adjacent teeth, resulting in a flat bone crest?

Furcation involvement
Fenestration
Vertical bone loss
Horizontal bone loss (Correct answer)

Correct answer: Horizontal bone loss

Horizontal bone loss describes uniform reduction of alveolar bone height across adjacent teeth, leaving a flat, level bone crest.

Question 18: A radiograph shows a radiolucent area at the apex of a non-vital tooth with an intact lamina dura elsewhere. This finding is most consistent with:

Condensing osteitis
Periapical cemental dysplasia (early stage)
Periapical abscess or granuloma (Correct answer)
Normal anatomical landmark

Correct answer: Periapical abscess or granuloma

A periapical radiolucency on a non-vital tooth with intact surrounding lamina dura is characteristic of a periapical abscess or granuloma.

Question 19: What is the primary purpose of using the paralleling technique in periapical radiography?

To minimize geometric distortion by aligning the film/sensor parallel to the long axis of the tooth (Correct answer)
To reduce patient exposure by using a shorter cone
To allow imaging of the full arch on one film
To improve visualization of soft tissue structures

Correct answer: To minimize geometric distortion by aligning the film/sensor parallel to the long axis of the tooth

The paralleling technique places the receptor parallel to the tooth's long axis and directs the central beam perpendicular to both, minimizing elongation and foreshortening.

Question 20: Amalgam creep refers to:

Corrosion of amalgam margins over time in the oral environment
Slow plastic deformation of amalgam under sustained compressive load (Correct answer)
Setting expansion of amalgam beyond acceptable limits
Fracture of the amalgam isthmus under occlusal stress

Correct answer: Slow plastic deformation of amalgam under sustained compressive load

Creep in amalgam is time-dependent plastic deformation that occurs under sustained compressive stress, which can lead to overhanging margins and marginal breakdown.

Question 21: During aerosol-generating dental procedures, which respiratory protection provides the highest level of protection for the dental hygienist?

Cloth face covering with filter insert
Dust mask rated P100
Standard surgical mask
N95 filtering facepiece respirator fitted and fit-tested (Correct answer)

Correct answer: N95 filtering facepiece respirator fitted and fit-tested

An N95 respirator, when properly fit-tested, filters at least 95% of airborne particles and provides significantly more protection than a surgical mask during aerosol generation.

Question 22: During an extraoral examination, the hygienist notes asymmetric swelling of the parotid gland bilaterally in a patient with a BMI of 16. Which condition should be considered?

Sarcoidosis
Mumps infection
Sjögren's syndrome only
Bulimia nervosa-related sialadenosis (Correct answer)

Correct answer: Bulimia nervosa-related sialadenosis

Bilateral parotid enlargement (sialadenosis) combined with a very low BMI is associated with bulimia nervosa due to repeated purging.

Question 23: When screening for oral cancer, the dental hygienist should pay particular attention to which anatomical sites as the highest-risk locations for squamous cell carcinoma?

Labial mucosa and buccal vestibule
Attached gingiva and buccal frenum
Hard palate and dorsal tongue
Lateral and ventral tongue and floor of mouth (Correct answer)

Correct answer: Lateral and ventral tongue and floor of mouth

The lateral/ventral tongue and floor of the mouth account for the majority of oral squamous cell carcinoma cases and require thorough inspection.

Question 24: Which hepatitis virus is primarily transmitted through the fecal-oral route and poses a lower occupational risk via blood exposure in dentistry?

Hepatitis D
Hepatitis C
Hepatitis A (Correct answer)
Hepatitis B

Correct answer: Hepatitis A

Hepatitis A is transmitted fecal-orally, not through blood, so it poses minimal occupational bloodborne risk in dental settings compared to HBV and HCV.

Question 25: A dental hygienist with a latex allergy should request which alternative glove material that provides similar barrier protection?

Polyethylene gloves for aerosol-generating procedures
Nitrile gloves, which provide comparable barrier protection without latex allergens (Correct answer)
Vinyl gloves for all procedures
Double latex gloves to reduce allergen contact

Correct answer: Nitrile gloves, which provide comparable barrier protection without latex allergens

Nitrile gloves offer excellent barrier protection, durability, and chemical resistance without natural rubber latex proteins that trigger Type I hypersensitivity reactions.

Question 26: What three types of dental mirrors are there?

Front surface, back surface, and marginal surface
Front surface, mid surface, and back surface
Front surface, back surface, and flat surface
Front surface, concave, and plane (Correct answer)

Correct answer: Front surface, concave, and plane

Dental mirrors come in three main types, each offering distinct advantages for intraoral examination. Front surface mirrors provide the clearest image by eliminating ghost images, as the reflective coating is on the front of the glass. Concave (magnifying) mirrors enlarge the image, which can be useful for detailed inspection, while plane (flat) mirrors offer a true-to-size image without magnification or distortion.

Question 27: According to OSHA's Bloodborne Pathogen Standard, who is responsible for providing hepatitis B vaccination to dental employees?

The employer at no cost to the employee (Correct answer)
The employee's private insurance
The employee at their own expense
The state dental board

Correct answer: The employer at no cost to the employee

OSHA 29 CFR 1910.1030 requires employers to offer HBV vaccination to all employees with occupational exposure at no cost within 10 days of assignment.

Question 28: Agar (reversible hydrocolloid) impression material converts from gel to sol by:

Absorption of moisture from surrounding tissue
Addition of a sulfate accelerator
Chemical reaction with a hardening agent
Heating to approximately 100°C (Correct answer)

Correct answer: Heating to approximately 100°C

Agar is a thermoreversible material that liquefies (sol) upon heating to ~100°C and gels upon cooling, allowing it to be reused multiple times.

Question 29: A patient has 30% bone loss, 6 mm probing depths, and tooth mobility. According to the 2017 AAP classification, which Stage of periodontitis best fits this presentation?

Stage II
Stage III (Correct answer)
Stage I
Stage IV

Correct answer: Stage III

Stage III periodontitis is characterized by ≥30% bone loss, probing depths ≥6 mm, and tooth mobility, indicating severe disease with potential for tooth loss.

Question 30: Which of the following is considered subjective data collected during the assessment phase of the dental hygiene process of care?

A 6mm probing depth on the distal of tooth #19.
Radiographic evidence of horizontal bone loss.
A plaque index score of 75%.
The patient's chief complaint of "my gums bleed when I brush." (Correct answer)

Correct answer: The patient's chief complaint of "my gums bleed when I brush."

Subjective data is information provided by the patient, such as their perceptions, feelings, and chief complaint. [28, 30, 34] Objective data is measurable and observable information collected by the clinician, such as probing depths, radiographic findings, and clinical indices. [26, 33]

Question 31: What mechanisms move oxygen?

Blood system and gland system
Respiratory system and gland system
Circulatory system and blood system
Circulatory system and respiratory system system (Correct answer)

Correct answer: Circulatory system and respiratory system system

Oxygen is moved throughout the body primarily by the coordinated efforts of the respiratory and circulatory systems. The respiratory system is responsible for gas exchange, bringing oxygen into the lungs and transferring it to the blood. The circulatory system then transports this oxygenated blood via the bloodstream to all cells and tissues, delivering the vital oxygen needed for cellular respiration.

Question 32: On a periapical radiograph, a widened periodontal ligament space that is uniform around the entire root most likely indicates:

Occlusal trauma or systemic disease causing generalized PDL widening (Correct answer)
Periapical abscess formation
External root resorption at the apex only
Localized periodontal disease attacking one surface

Correct answer: Occlusal trauma or systemic disease causing generalized PDL widening

Uniform widening of the PDL space around the entire root is associated with occlusal trauma, systemic diseases like scleroderma, or early malignant infiltration.

Question 33: A panoramic radiograph of a 45-year-old female patient shows multiple, well-defined, mixed-density lesions with radiolucent rims located in the periapical regions of the vital mandibular anterior teeth. The patient is asymptomatic. Which of the following is the most likely diagnosis?

Paget's Disease of Bone
Chronic Periapical Abscesses
Periapical Cemento-osseous Dysplasia (Correct answer)
Florid Cemento-osseous Dysplasia

Correct answer: Periapical Cemento-osseous Dysplasia

Periapical Cemento-osseous Dysplasia (PCOD) is a benign, reactive fibro-osseous lesion that typically presents in middle-aged females and has a strong predilection for the periapical region of the mandibular anterior teeth. [29] The associated teeth are vital. Radiographically, PCOD progresses through three stages: radiolucent, mixed-density, and finally a mature radiopaque stage, often with a surrounding radiolucent halo. [15, 28] The description matches the intermediate or mixed stage of PCOD.

Question 34: In amalgam, the gamma-2 phase (Sn8Hg) is considered undesirable because it:

Causes mercury toxicity to pulp tissue
Inhibits the formation of the gamma-1 phase
Is the weakest and most corrosion-prone phase (Correct answer)
Increases setting expansion excessively

Correct answer: Is the weakest and most corrosion-prone phase

The gamma-2 phase is the weakest component of amalgam and is highly susceptible to corrosion, leading to marginal breakdown.

Question 35: A patient with a history of adrenal insufficiency is undergoing a lengthy, stressful procedure. Which emergency is this patient at risk for?

Hypertensive crisis
Diabetic ketoacidosis
Addisonian (adrenal) crisis (Correct answer)
Hyperthyroid storm

Correct answer: Addisonian (adrenal) crisis

Patients with adrenal insufficiency cannot produce adequate cortisol in response to surgical stress, potentially triggering an Addisonian crisis with profound hypotension.

Question 36: After managing a medical emergency in the dental office, what documentation should the dental hygienist complete?

A brief note that the appointment was terminated due to a medical event
Only the patient's chief complaint in the progress notes
Documentation is not required unless the patient was transported by EMS
A detailed incident report including timeline, signs, interventions, patient response, and EMS outcome (Correct answer)

Correct answer: A detailed incident report including timeline, signs, interventions, patient response, and EMS outcome

A thorough incident report documenting the timeline, clinical findings, interventions, drug doses, and outcome is required for legal, quality assurance, and continuity-of-care purposes.

Question 37: A conscious patient reports crushing substernal chest pain radiating to the left arm. The dental hygienist suspects myocardial infarction. Which medication should be given while awaiting EMS?

Epinephrine 1:1000 IM
Aspirin 325 mg chewed plus nitroglycerin if not already taken (Correct answer)
Nitroglycerin 0.4 mg sublingual only
Albuterol inhaler

Correct answer: Aspirin 325 mg chewed plus nitroglycerin if not already taken

Aspirin inhibits platelet aggregation and reduces infarct size; it is given along with nitroglycerin (if the patient has not already taken their dose) while awaiting EMS.

Question 38: A patient taking warfarin presents with uncontrolled bleeding after a simple extraction. Which emergency drug found in the dental office emergency kit is MOST relevant?

Glucose gel
Vasoconstrictors are used topically; no systemic emergency drug is indicated (Correct answer)
Nitroglycerin
Epinephrine

Correct answer: Vasoconstrictors are used topically; no systemic emergency drug is indicated

For anticoagulant-induced prolonged bleeding, local hemostatic measures (pressure, gelatin sponge) are used; systemic reversal agents like vitamin K or FFP are not part of the dental emergency kit.

Question 39: Which antibiotic is the first-line prophylaxis recommendation for patients with cardiac conditions requiring infective endocarditis (IE) prevention before dental procedures?

Amoxicillin 2 g orally 30–60 minutes before the procedure (Correct answer)
Clindamycin 600 mg
Azithromycin 500 mg
Metronidazole 500 mg

Correct answer: Amoxicillin 2 g orally 30–60 minutes before the procedure

The AHA recommends amoxicillin 2 g orally 30–60 minutes before high-risk dental procedures as the first-line IE prophylaxis in adults.

Question 40: What is the primary composition of subgingival calculus that differentiates it from supragingival calculus?

Fluoride compounds predominate
Calcium carbonate predominates
It is composed primarily of organic matrix
Iron and magnesium phosphate give it a dark color; derives from gingival crevicular fluid (Correct answer)

Correct answer: Iron and magnesium phosphate give it a dark color; derives from gingival crevicular fluid

Subgingival calculus is dark brown or black due to blood pigments and derives its mineral content from gingival crevicular fluid rather than saliva.

Question 41: Which initiator-accelerator system is used in chemically activated (self-cured) composite resins?

Camphorquinone and amine
Diketone and photoinitiator
Hydrogen peroxide and UV light
Benzoyl peroxide and tertiary amine (Correct answer)

Correct answer: Benzoyl peroxide and tertiary amine

Self-cured composites use a two-paste system where benzoyl peroxide in one paste reacts with a tertiary amine in the other to initiate polymerization.

Question 42: What is the correct action if a dental waterline quality test reveals bacterial counts exceeding 500 CFU/mL?

Report the result to the state dental board immediately
Shock-treat the waterlines with an approved disinfectant protocol and retest before patient use (Correct answer)
Flush the lines for 30 seconds before each patient and retest at the next scheduled interval
Continue using the unit since counts above 500 only affect immunocompromised patients

Correct answer: Shock-treat the waterlines with an approved disinfectant protocol and retest before patient use

The CDC recommends that dental unit water meet the EPA drinking water standard of ≤500 CFU/mL; counts exceeding this require corrective treatment (shocking) and retesting before resuming patient care.

Question 43: Which of the following best describes the cutting edge of a universal curette compared to a Gracey curette?

Universal curettes have one cutting edge; Gracey curettes have two
Gracey curettes have two curved cutting edges; universal curettes have one straight edge
Both types have identical cutting edges
Universal curettes have two cutting edges; Gracey curettes have one functional cutting edge (Correct answer)

Correct answer: Universal curettes have two cutting edges; Gracey curettes have one functional cutting edge

Universal curettes have two usable cutting edges, while Gracey curettes have one lower, offset cutting edge.

Question 44: A dental hygienist sustains a needlestick from a patient with unknown HIV status. What is the FIRST action to take?

Immediately report to the supervisor
Document the incident in the patient record
Flush the wound with soap and water for several minutes (Correct answer)
Begin post-exposure prophylaxis within 72 hours

Correct answer: Flush the wound with soap and water for several minutes

Immediate decontamination by washing with soap and water is the first step before any reporting or prophylaxis decisions.

Question 45: The legal document that grants a dental hygienist permission to practice is called a:

Certification
License (Correct answer)
Registration
Permit

Correct answer: License

A license is the legal credential issued by a state dental board that authorizes a dental hygienist to practice in that state.

Question 46: A patient's blood pressure reading is 148/94 mmHg at two separate appointments. How should this be classified according to the AHA guidelines?

Normal
Elevated
Stage 1 hypertension (Correct answer)
Stage 2 hypertension

Correct answer: Stage 1 hypertension

Stage 1 hypertension is defined as systolic 130-139 mmHg or diastolic 80-89 mmHg; 148/94 falls in Stage 2 (≥140/90).

Question 47: What body temperature is deemed to be abnormally high and may indicate the existence of an illness or infection?

100.1 degrees
98.7 degrees
99.5 degrees (Correct answer)
101.0 degrees

Correct answer: 99.5 degrees

While normal body temperature can vary slightly, a temperature of 99.5 degrees Fahrenheit (37.5 degrees Celsius) is generally considered a low-grade fever and may indicate the presence of an illness or infection. This elevation signals the body's immune response to a pathogen or inflammatory process. It's an important vital sign for dental hygienists to monitor, as it can contraindicate certain dental procedures or necessitate medical referral.

Question 48: Which emergency medication in the dental office kit is used to manage a patient experiencing an adrenal crisis (acute adrenal insufficiency)?

Glucagon IM injection
Diphenhydramine IV
Nitroglycerin sublingual spray
Hydrocortisone sodium succinate (Solu-Cortef) injectable (Correct answer)

Correct answer: Hydrocortisone sodium succinate (Solu-Cortef) injectable

Hydrocortisone (Solu-Cortef) replaces the cortisol that patients on chronic corticosteroid therapy or with Addison's disease cannot produce during surgical stress.

Question 49: Which of the following best describes the signs of hypoglycemia in a dental patient?

Diaphoresis, confusion, and shakiness with rapid onset (Correct answer)
Dry skin, fruity breath, and slow onset
Cyanosis, wheezing, and urticaria
Hypertension, bradycardia, and facial flushing

Correct answer: Diaphoresis, confusion, and shakiness with rapid onset

Hypoglycemia presents with diaphoresis (sweating), confusion, and trembling due to rapid blood glucose drop, distinguishing it from hyperglycemia which has a slower onset.

Question 50: Which of the following actions during instrument reprocessing represents a critical error that could lead to sterilization failure?

Storing sterile packages in a closed, dry cabinet.
Placing clean, but still damp, instruments into a sterilization pouch. (Correct answer)
Using an ultrasonic cleaner with the lid in place.
Wearing puncture-resistant utility gloves while cleaning instruments.

Correct answer: Placing clean, but still damp, instruments into a sterilization pouch.

Instruments must be completely dry before being packaged for heat sterilization. Any residual moisture can interfere with the sterilization process and may cause wet packs, which can wick microorganisms through the packaging material after the cycle is complete, compromising the sterility of the instruments.

Question 51: Which cranial nerve provides motor innervation to all intrinsic and most extrinsic muscles of the tongue?

Hypoglossal nerve (CN XII) (Correct answer)
Vagus nerve (CN X)
Trigeminal nerve (CN V)
Glossopharyngeal nerve (CN IX)

Correct answer: Hypoglossal nerve (CN XII)

The hypoglossal nerve (CN XII) provides motor innervation to all intrinsic tongue muscles and most extrinsic tongue muscles, controlling tongue movement.

Question 52: What is the supragingival source of nutrition?

Calcium (Correct answer)
Protein
Iron
Water

Correct answer: Calcium

Supragingival calculus (tartar) forms above the gumline and is primarily mineralized plaque. Its mineralization is largely influenced by calcium and phosphate ions present in saliva. Therefore, calcium from saliva is considered a primary source of nutrition (minerals) for the formation of supragingival calculus, contributing to its hardened structure.

Question 53: Which local delivery antimicrobial agent is FDA-approved for subgingival placement as an adjunct to scaling and root planing?

Doxycycline hyclate (Atridox) or minocycline microspheres (Arestin) (Correct answer)
Triclosan gel
Sodium hypochlorite irrigation
Amoxicillin tablets

Correct answer: Doxycycline hyclate (Atridox) or minocycline microspheres (Arestin)

Both Atridox (doxycycline hyclate) and Arestin (minocycline microspheres) are FDA-approved for subgingival use adjunctive to SRP.

Question 54: Latex hypersensitivity in dental patients is best managed by:

Scheduling the patient as the last appointment of the day
Pre-medicating the patient with antihistamines only
Using low-allergen powdered latex gloves
Using latex-free gloves and latex-free equipment throughout treatment (Correct answer)

Correct answer: Using latex-free gloves and latex-free equipment throughout treatment

Latex-allergic patients require a completely latex-free environment, including gloves, dams, and any other latex-containing materials.

Question 55: What is an internal tooth stain?

Within stain
Anta
None of the above
Endogenous stain (Correct answer)

Correct answer: Endogenous stain

An endogenous stain is an internal tooth stain, meaning it originates from within the tooth structure during tooth development or after eruption. These stains are often caused by systemic factors like certain medications (e.g., tetracycline), excessive fluoride intake (fluorosis), or trauma. Unlike extrinsic stains, endogenous stains cannot be removed by professional cleaning and often require cosmetic treatments like whitening or veneers.

Question 56: At what depth should chest compressions be performed on an adult patient during CPR according to current AHA guidelines?

At least 2 inches (5 cm), not exceeding 2.4 inches (6 cm) (Correct answer)
As deep as needed to feel a pulse
1–1.5 inches (2.5–3.8 cm)
3 inches (7.6 cm)

Correct answer: At least 2 inches (5 cm), not exceeding 2.4 inches (6 cm)

AHA guidelines specify chest compressions of at least 2 inches (5 cm) but no more than 2.4 inches (6 cm) to optimize cardiac output without causing injury.

Question 57: A patient completes non-surgical periodontal therapy. Four weeks later, the dental hygienist performs a re-assessment, comparing the initial probing depths and bleeding scores with the current findings. This action is a critical part of which phase of the process of care?

Evaluation (Correct answer)
Implementation
Planning
Re-assessment

Correct answer: Evaluation

The evaluation phase is where the dental hygienist measures the extent to which the goals set in the care plan have been achieved. [9, 16] This involves collecting new data and comparing it to the baseline assessment data to determine the success of the implemented interventions and to plan for future care. [1]

Question 58: A simple bone cyst (traumatic bone cyst) most commonly appears radiographically as:

A multilocular radiolucency with sclerotic borders
A mixed radiolucent-radiopaque lesion in the posterior mandible
A unilocular radiolucency with scalloping between tooth roots and no cortical expansion (Correct answer)
A diffuse radiopacity replacing cancellous bone

Correct answer: A unilocular radiolucency with scalloping between tooth roots and no cortical expansion

Simple bone cysts present as unilocular radiolucencies that classically scallop upward between tooth roots; they are empty cavities and teeth test vital.

Question 59: Which position is MOST appropriate for a patient experiencing syncope in the dental chair?

Seated upright with head between knees
Supine with legs elevated above heart level (Trendelenburg) (Correct answer)
Left lateral recumbent position
Semi-reclined at 45 degrees

Correct answer: Supine with legs elevated above heart level (Trendelenburg)

The Trendelenburg position (supine with legs elevated) increases venous return to the heart and improves cerebral perfusion in patients experiencing vasovagal syncope.

Question 60: What does the term 'chain of infection' refer to in infection control?

The order in which PPE is removed
The linked steps required for a pathogen to cause disease in a new host (Correct answer)
The sterilization sequence for dental instruments
The hierarchy of disinfection levels

Correct answer: The linked steps required for a pathogen to cause disease in a new host

The chain of infection describes six links — infectious agent, reservoir, portal of exit, mode of transmission, portal of entry, and susceptible host — that must all be present for infection to occur.

Question 61: Which of the following describes the radiographic appearance of enamel pearls (enamelomas)?

Radiopaque lines running parallel to the root surface
Radiolucent droplets at the CEJ of molars
Small, discrete radiopaque nodules located in the furcation area of molar roots (Correct answer)
Calcified pulp stones visible within the pulp chamber

Correct answer: Small, discrete radiopaque nodules located in the furcation area of molar roots

Enamel pearls are small deposits of ectopic enamel that appear as discrete radiopaque nodules, usually found in the furcation area of maxillary molars.

Question 62: During a procedure, a patient suddenly loses consciousness and begins to experience tonic-clonic movements in the dental chair. Which of the following is the primary and most appropriate immediate response?

Lower the chair, clear the area of hazards, and roll the patient onto their side. (Correct answer)
Place a padded tongue depressor in the patient's mouth to prevent them from biting their tongue.
Attempt to firmly restrain the patient's movements to prevent injury.
Immediately begin chest compressions and call for an AED.

Correct answer: Lower the chair, clear the area of hazards, and roll the patient onto their side.

During a seizure, the primary goal is to protect the patient from injury. This involves clearing the area of any instruments or objects that could cause harm, lowering the chair to prevent a fall, and turning the patient to their side (recovery position) to help maintain an open airway and prevent aspiration. [4, 15, 18] Restraining the patient can cause musculoskeletal injury, and placing any object in the mouth is contraindicated and can cause airway obstruction or damage to the teeth and soft tissues. [18, 23]

Question 63: During local anesthetic injection, a patient suddenly becomes pale, diaphoretic, and loses consciousness for 30 seconds then recovers. What most likely occurred?

Allergic reaction to the local anesthetic
Vasovagal syncope (Correct answer)
Local anesthetic toxicity
Epinephrine overdose

Correct answer: Vasovagal syncope

A brief loss of consciousness following an injection, preceded by pallor and diaphoresis, is classic vasovagal syncope caused by anxiety and pain-induced vagal response.

Question 64: The lingual nerve provides general sensory innervation to which area?

The entire tongue and floor of the mouth
Posterior one-third of the tongue only
Posterior tongue and pharynx only
Anterior two-thirds of the tongue and floor of the mouth (Correct answer)

Correct answer: Anterior two-thirds of the tongue and floor of the mouth

The lingual nerve (a branch of V3) provides general sensation to the anterior two-thirds of the tongue and the floor of the mouth; the chorda tympani joins it to carry taste from the same region.

Question 65: Hand hygiene with an alcohol-based hand rub is NOT appropriate in which of the following situations?

Before donning gloves for patient care
After removing gloves following a routine exam
When hands are visibly soiled with blood or body fluids (Correct answer)
Between patients when hands appear clean

Correct answer: When hands are visibly soiled with blood or body fluids

Alcohol-based hand rubs are ineffective against visible soiling; soap and water must be used when hands are visibly contaminated.

Question 66: Which type of debridement is indicated when residual calculus is detected at a 6-week re-evaluation following initial therapy?

Prophylaxis
Re-instrumentation (retreatment) (Correct answer)
Supragingival scaling only
Gross debridement only

Correct answer: Re-instrumentation (retreatment)

Residual calculus identified at re-evaluation requires re-instrumentation (retreatment) of the affected sites before progressing to supportive care.

Question 67: A patient taking phenytoin (Dilantin) is most likely to exhibit which periodontal condition?

Gingival enlargement (overgrowth) (Correct answer)
Aggressive bone loss
Necrotizing ulcerative gingivitis
Gingival recession

Correct answer: Gingival enlargement (overgrowth)

Phenytoin causes drug-induced gingival enlargement due to increased fibroblast proliferation and altered collagen metabolism.

Question 68: A patient's blood pressure reading is 185/110 mmHg before treatment. According to ADA guidelines, what should the dental hygienist do?

Proceed with treatment as this is within normal limits
Proceed with treatment but avoid epinephrine-containing local anesthetics
Reschedule treatment and refer for medical evaluation (Correct answer)
Administer an antihypertensive from the emergency kit

Correct answer: Reschedule treatment and refer for medical evaluation

A BP ≥180/110 mmHg (Stage 2 hypertensive crisis) requires postponing elective dental treatment and referring the patient for medical evaluation.

Question 69: Bulimia nervosa patients frequently present with which characteristic dental finding caused by repeated gastric acid exposure?

Enamel fluorosis
Generalized tetracycline staining
Cervical abrasion
Perimylolysis (erosion on palatal surfaces of maxillary anterior teeth) (Correct answer)

Correct answer: Perimylolysis (erosion on palatal surfaces of maxillary anterior teeth)

Recurrent self-induced vomiting exposes the palatal surfaces of upper anterior teeth to gastric acid, causing a smooth, glossy erosion pattern called perimylolysis.

Question 70: During a periodontal assessment, a dental hygienist records a 6mm probing depth, 2mm of gingival recession, and class II furcation involvement on the facial aspect of tooth #30. What is the Clinical Attachment Loss (CAL) for this site?

4 mm
2 mm
6 mm
8 mm (Correct answer)

Correct answer: 8 mm

Clinical Attachment Loss (CAL) is calculated by adding the probing depth and the amount of gingival recession. In this scenario, the probing depth is 6 mm and the recession is 2 mm. Therefore, 6 mm + 2 mm = 8 mm of CAL. Furcation involvement is a critical finding but is not used in the calculation of CAL.

Question 71: A patient's periodontal chart shows probing depths of 2-3 mm with bleeding on probing at 45% of sites and no bone loss on radiographs. According to the 2017 classification, this is best described as:

Gingivitis associated with dental biofilm (Correct answer)
Stage I periodontitis
Healthy periodontium
Gingival health on a reduced periodontium

Correct answer: Gingivitis associated with dental biofilm

Bleeding on probing with shallow pockets and no radiographic bone loss in an intact periodontium is classified as gingivitis associated with dental biofilm.

Question 72: The implementation phase of the dental hygiene process of care primarily involves which of the following activities?

Comparing current clinical findings to baseline data to determine success.
Establishing patient-centered goals and treatment sequences.
Collecting and analyzing patient data to identify needs.
Delivering the planned dental hygiene services and education. (Correct answer)

Correct answer: Delivering the planned dental hygiene services and education.

The implementation phase is the action-oriented stage where the dental hygiene care plan is put into action. [1, 2] This includes delivering the therapeutic services (e.g., scaling) and educational interventions that were outlined in the planning phase.

Question 73: During the assessment phase, a dental hygienist notices gingival bleeding on probing in posterior sextants only. Which periodontal classification best describes localized bleeding without bone loss?

Stage II periodontitis
Necrotizing periodontal disease
Gingivitis associated with dental biofilm (Correct answer)
Stage I periodontitis

Correct answer: Gingivitis associated with dental biofilm

Bleeding on probing without attachment or bone loss is consistent with gingivitis associated with dental biofilm per the 2017 classification.

Question 74: When instrumenting a furcation area with Class II furcation involvement, the BEST instrument choice is a:

Standard sickle scaler
Nabers probe and furcation curette (Correct answer)
Gracey 11/12 curette
Universal curette with extended shank

Correct answer: Nabers probe and furcation curette

The Nabers probe identifies furcation depth, and furcation-specific curettes adapt within the concave furcation anatomy.

Question 75: How many different ways are there to use fluoride?

one
two
four
three (Correct answer)

Correct answer: three

Fluoride can be used in three primary ways to prevent dental caries: systemic, topical, and professional. Systemic fluoride is ingested (e.g., fluoridated water, supplements) and incorporated into developing tooth enamel. Topical fluoride is applied directly to the tooth surface (e.g., toothpaste, mouth rinses) to strengthen existing enamel. Professional fluoride applications (e.g., gels, varnishes) provide a higher concentration for enhanced protection.

Question 76: Which of the following is the definitive, first-line medication for treating a patient experiencing a severe, life-threatening allergic reaction (anaphylaxis) characterized by respiratory distress and hypotension?

Oral diphenhydramine (Benadryl)
Intramuscular epinephrine (Correct answer)
Intravenous corticosteroids
An albuterol inhaler

Correct answer: Intramuscular epinephrine

Intramuscular epinephrine is the primary, life-saving medication for anaphylaxis. It acts rapidly to counteract vasodilation and bronchoconstriction, which are the life-threatening components of the reaction. While antihistamines, corticosteroids, and albuterol are used as adjunctive therapies, they do not act fast enough and are not considered first-line treatment.

Question 77: A patient presents with generalized gingival redness, spontaneous bleeding, and painful ulcerations with a punched-out papillary appearance and a pseudomembrane. The most likely diagnosis is:

Desquamative gingivitis from pemphigoid
Necrotizing ulcerative gingivitis (NUG) (Correct answer)
Acute herpetic gingivostomatitis
Plasma cell gingivitis

Correct answer: Necrotizing ulcerative gingivitis (NUG)

NUG is characterized by punched-out necrotic interdental papillae, pseudomembrane formation, spontaneous bleeding, and pain.

Question 78: A patient with a history of angina reports chest pain that is not relieved after one nitroglycerin tablet. What is the appropriate next step?

Administer a second nitroglycerin tablet and wait 10 minutes
Place the patient supine and call 911 immediately
Administer a second nitroglycerin tablet after 5 minutes and call EMS if pain persists after a third dose (Correct answer)
Give aspirin 325 mg and monitor for 30 minutes

Correct answer: Administer a second nitroglycerin tablet after 5 minutes and call EMS if pain persists after a third dose

If one nitroglycerin tablet does not relieve chest pain, a second may be given after 5 minutes; if pain persists after a third dose, EMS must be activated as myocardial infarction is suspected.

Question 79: A dental hygienist sustains a percutaneous injury with a contaminated scaler. After performing immediate first aid by washing the wound with soap and water, what is the required NEXT step according to the OSHA Bloodborne Pathogens Standard?

Complete an incident report at the end of the workday.
Insist that the source patient undergo immediate blood testing.
Report the exposure incident to the employer or designated supervisor. (Correct answer)
Go to an urgent care clinic for post-exposure prophylaxis.

Correct answer: Report the exposure incident to the employer or designated supervisor.

According to OSHA's Bloodborne Pathogens Standard, after immediate first aid, the exposure incident must be reported immediately to the employer. This action initiates the required post-exposure evaluation and follow-up protocol, which the employer is responsible for providing at no cost to the employee. This protocol includes documenting the incident, evaluating the source patient (with consent), and providing confidential medical counseling and testing for the employee.

Question 80: Which of the following is the MOST important initial step when any medical emergency is recognized in the dental office?

Retrieve the emergency drug kit
Activate the office emergency team and call for help (Correct answer)
Document the time the emergency began
Begin CPR regardless of patient status

Correct answer: Activate the office emergency team and call for help

Activating the dental office emergency team ensures help is summoned and roles are assigned, forming the foundation of an organized emergency response before specific interventions.

Question 81: Which radiographic feature helps differentiate a lateral periodontal cyst from a periapical lesion?

The lateral periodontal cyst is ill-defined and associated with non-vital teeth
The periapical lesion is well-corticated while the lateral cyst is not
The lateral periodontal cyst is located lateral to the root of a vital tooth with no periapical involvement (Correct answer)
The lateral periodontal cyst always shows root resorption

Correct answer: The lateral periodontal cyst is located lateral to the root of a vital tooth with no periapical involvement

A lateral periodontal cyst appears as a well-defined radiolucency on the lateral aspect of a vital tooth root, distinguishing it from periapical pathology associated with non-vital teeth.

Question 82: Stage III Grade C periodontitis is most strongly associated with which systemic risk modifier?

Poorly controlled diabetes (HbA1c ≥7%) (Correct answer)
Anemia
Hypothyroidism
Osteoporosis

Correct answer: Poorly controlled diabetes (HbA1c ≥7%)

Grade C periodontitis indicates rapid progression and is strongly associated with poorly controlled diabetes (HbA1c ≥7%) as a systemic risk factor per the 2017 classification.

Question 83: What does the term 'wettability' mean in the context of dental adhesive materials?

The water absorption capacity of a cured resin
The material's resistance to dissolution in oral fluids
The hydrophilicity of dentin bonding agents in wet conditions
The ability of a liquid material to spread over and contact a surface (Correct answer)

Correct answer: The ability of a liquid material to spread over and contact a surface

Wettability describes how well a liquid spreads across a surface; materials with low contact angles spread readily, promoting intimate contact and adhesion.

Question 84: Which of the following BEST describes the purpose of a dental hygiene diagnosis?

Determine the patient's chief complaint
Identify medical diseases requiring physician referral
Label oral conditions the dental hygienist is licensed to treat (Correct answer)
Establish a definitive disease diagnosis for the record

Correct answer: Label oral conditions the dental hygienist is licensed to treat

The dental hygiene diagnosis identifies oral health problems within the dental hygienist's scope that guide individualized care planning.

Question 85: According to CDC guidelines, how often should biological monitoring of steam autoclaves be performed at minimum?

Monthly
Only when mechanical failure occurs
Daily
Weekly (Correct answer)

Correct answer: Weekly

The CDC recommends at least weekly biological monitoring of sterilizers in dental offices to verify their function.

Question 86: A 62-year-old patient with a history of stable angina complains of substernal chest pain. You stop the procedure and administer one dose of their sublingual nitroglycerin. After 5 minutes, the patient states the pain is unimproved. What is the most critical next step?

Administer a second and third dose of nitroglycerin before taking further action.
Have the patient chew a 325 mg aspirin tablet.
Continue to monitor vital signs for another 10 minutes.
Assume the patient is experiencing a myocardial infarction and activate emergency medical services (EMS). (Correct answer)

Correct answer: Assume the patient is experiencing a myocardial infarction and activate emergency medical services (EMS).

Chest pain that is not relieved by one dose of nitroglycerin should be treated as a potential myocardial infarction (heart attack). The absolute priority is to activate EMS (call 911) immediately. While administering oxygen or aspirin may be part of the subsequent management protocol, delaying the call for advanced medical care is detrimental.

Question 87: What is the rate of chest compressions recommended for adult CPR per current AHA guidelines?

80–100 compressions per minute
100–120 compressions per minute (Correct answer)
120–140 compressions per minute
60–80 compressions per minute

Correct answer: 100–120 compressions per minute

Current AHA guidelines recommend a compression rate of 100–120 per minute to maintain adequate cardiac output without reducing effectiveness from excessive speed.

Question 88: A patient reports taking warfarin. Which assessment finding is MOST critical to document before instrumentation?

Blood pressure reading
Pulse oximetry reading
Fasting blood glucose
INR value (Correct answer)

Correct answer: INR value

The INR (International Normalized Ratio) determines bleeding risk for patients on warfarin and must be within a safe range before instrumentation.

Question 89: Furcation involvement in a mandibular first molar is classified as Class II when the probe can:

Enter the furcation but not pass through completely (Correct answer)
Just detect the furcation entrance but not enter
Pass completely through the furcation
Detect bone loss radiographically only

Correct answer: Enter the furcation but not pass through completely

Class II furcation means the probe can enter the furcation area but cannot pass through to the other side, indicating partial bone loss.

Question 90: What is the primary concern when a seizure in a dental patient lasts longer than 5 minutes?

Status epilepticus requiring immediate EMS activation (Correct answer)
Risk of the patient biting the clinician
Aspiration of a dental instrument
Airway obstruction from saliva

Correct answer: Status epilepticus requiring immediate EMS activation

A seizure lasting more than 5 minutes is classified as status epilepticus, a medical emergency requiring EMS and potential administration of benzodiazepines.

Question 91: In the 2017 AAP/EFP classification system, Grade reflects which aspect of periodontitis?

The rate of disease progression, risk factors, and systemic impact (Correct answer)
The number of teeth affected
The depth of periodontal pockets
The severity and extent of bone and attachment loss

Correct answer: The rate of disease progression, risk factors, and systemic impact

Grade (A, B, or C) describes the rate of periodontitis progression, evidence of direct and indirect risk factors, and the disease's potential systemic impact.

Question 92: Mottled enamel (dental fluorosis) results from excessive fluoride intake during which developmental phase?

Enamel matrix formation and calcification (Correct answer)
Post-eruption maturation
Tooth eruption
Root development only

Correct answer: Enamel matrix formation and calcification

Excess fluoride during amelogenesis disrupts enamel protein removal and mineralization, causing hypomineralized or pitted enamel.

Question 93: According to the CDC, what is the maximum acceptable level of heterotrophic bacteria, measured in colony-forming units per milliliter (CFU/mL), for routine dental treatment water?

1000 CFU/mL
100 CFU/mL
200 CFU/mL
500 CFU/mL (Correct answer)

Correct answer: 500 CFU/mL

The CDC states that for routine, non-surgical dental procedures, the water used should meet the EPA's regulatory standard for safe drinking water, which is ≤500 CFU/mL of heterotrophic bacteria.

Question 94: Which vitamin is synthesized in the skin through sunlight exposure and is essential for calcium absorption in the gut, thereby supporting tooth and bone mineralization?

Vitamin E
Vitamin B6
Vitamin A
Vitamin D (Correct answer)

Correct answer: Vitamin D

Vitamin D acts as a hormone that upregulates intestinal calcium-binding proteins, increasing calcium absorption needed for mineralization.

Question 95: The 'red complex' pathogens in periodontal microbiology include which combination?

Porphyromonas gingivalis, Tannerella forsythia, Treponema denticola (Correct answer)
Prevotella intermedia, Peptostreptococcus micros, Eubacterium nodatum
A. actinomycetemcomitans, Fusobacterium nucleatum, Campylobacter rectus
Streptococcus sanguis, Actinomyces naeslundii, Veillonella parvula

Correct answer: Porphyromonas gingivalis, Tannerella forsythia, Treponema denticola

The red complex, identified by Socransky et al., consists of Porphyromonas gingivalis, Tannerella forsythia, and Treponema denticola and is most strongly associated with severe periodontitis.

Question 96: Which of the following BEST describes the activation phase of a stroke during hand instrumentation?

Adapting the toe-third of the blade to the tooth surface
Stabilizing with a fulcrum before instrument insertion
Inserting the instrument to the base of the pocket with the toe closed
Applying lateral pressure and moving the instrument coronally against the tooth (Correct answer)

Correct answer: Applying lateral pressure and moving the instrument coronally against the tooth

The working stroke involves lateral pressure against the deposit while moving the instrument coronally to dislodge calculus.

Question 97: What is the primary purpose of the terminal shank angle on area-specific Gracey curettes?

To enable use on both posterior and anterior teeth equally
To reduce operator hand fatigue
To increase instrument rigidity for heavy calculus
To allow adaptation to specific tooth surfaces and angles (Correct answer)

Correct answer: To allow adaptation to specific tooth surfaces and angles

The offset and angled terminal shank of Gracey curettes is engineered so the lower blade adapts precisely to specific tooth surfaces.

Question 98: The facial artery, which supplies the face and lips, is a direct branch of which major vessel?

Internal carotid artery
External carotid artery (Correct answer)
Maxillary artery
Subclavian artery

Correct answer: External carotid artery

The facial artery arises directly from the external carotid artery and winds around the mandible to supply the face, including the lips and nose.

Question 99: A patient with a latex allergy presents for treatment. Which action is MOST critical before beginning the appointment?

Ensure all latex-containing products are removed from the operatory and use latex-free gloves (Correct answer)
Prescribe an antihistamine prophylactically
Document the allergy but proceed normally if no history of anaphylaxis
Schedule the patient for the last appointment of the day

Correct answer: Ensure all latex-containing products are removed from the operatory and use latex-free gloves

A latex-free environment must be established by removing all latex products because contact or airborne exposure can trigger anaphylaxis.

Question 100: What radiographic change is associated with hypercementosis?

Bulbous thickening of the root with an intact PDL space and lamina dura (Correct answer)
Irregular root surface with external resorption pits
Loss of lamina dura and widened PDL space
Root shortening and blunting of the apex

Correct answer: Bulbous thickening of the root with an intact PDL space and lamina dura

Hypercementosis appears as a bulbous enlargement of the root due to excess cementum deposition, with the PDL space and lamina dura remaining intact.

ADEX Dental Hygiene Exam

The ADEX Dental Hygiene Exam exam validates essential knowledge and skills required for certification or licensure in this field.

100

Questions

120 min

Time Limit

75%

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