Mixed Deck — All RDA Topics Flashcards

What radiographic error appears as a cone-shaped radiopaque shadow on the periapical image?

Answer: Cone cutting

Cone cutting occurs when the PID (cone) is not aligned correctly and the primary beam misses part of the film/sensor, resulting in a clear (unexposed) area with a cone/circular shape.

Which action BEST demonstrates the RDA's commitment to continuing education?

Answer: Attending dental conferences, completing CE credits, and staying current with evidence-based practices

Active pursuit of CE credits and evidence-based updates is a professional obligation and marks a committed RDA.

What is the primary purpose of a wooden wedge placed interproximally during a Class II restoration?

Answer: To separate teeth and seal the gingival margin of the matrix band

Wooden wedges are placed to adapt the matrix band tightly at the gingival margin and provide slight tooth separation.

What should the RDA do FIRST if a patient develops syncope (fainting) during a procedure?

Answer: Place patient in Trendelenburg (supine with feet elevated) position

For syncope, the first step is to place the patient in the Trendelenburg position (supine with feet elevated above the heart) to restore blood flow to the brain.

What is the primary role of the RDA when the dentist is administering a local anesthetic injection?

Answer: Monitor the patient, retract tissue, and maintain a calm environment

The RDA supports the procedure by monitoring patient response, retracting tissue as needed, and helping maintain patient comfort and cooperation.

In the Universal Numbering System, which tooth is #17?

Answer: Mandibular left third molar

In the Universal system, #17 is the mandibular left third molar; numbering continues from #16 (maxillary left third molar) around the arch.

When mixing type III gypsum dental stone for a diagnostic model, what does an increased water-to-powder (W:P) ratio result in?

Answer: Weaker model with decreased strength and increased porosity

Too much water (high W:P ratio) produces excess porosity as water evaporates, resulting in a weaker, softer model with poor surface detail and lower compressive strength.

When receiving constructive criticism from a supervising dentist, the MOST professional response is to:

Answer: Listen actively, acknowledge the feedback, and apply the correction to future practice

Receiving feedback with openness and applying it reflects professionalism and a commitment to continuous improvement.

During the setting of zinc phosphate cement, why is the powder incorporated into the liquid in small increments over a wide, cool glass slab?

Answer: To dissipate heat and extend working time

The setting reaction of zinc phosphate is exothermic; spatulating on a cool slab and adding powder incrementally dissipates heat and prolongs working time.

What is the difference between 'direct supervision' and 'general supervision' under California dental law?

Answer: Direct supervision requires the dentist to be physically present in the office and personally authorize treatment; general supervision allows the RDA to perform authorized procedures without the dentist being physically present

Direct supervision requires the dentist to be physically present in the dental facility and available to oversee the procedure. General supervision allows the RDA to perform authorized procedures even when the dentist is not physically present at the time.

After failing a DANB component exam, how long must a candidate typically wait before retesting?

Answer: 30 days

DANB requires a 30-day waiting period between exam attempts to allow candidates time to prepare adequately.

Which bone forms the posterior portion of the hard palate?

Answer: Palatine bone

The hard palate is formed by two bones: the palatine processes of the maxilla (anterior two-thirds) and the horizontal plates of the paired palatine bones (posterior one-third). The vomer forms the nasal septum, not the palate.

What document must an RDA submit to the state dental board to demonstrate completion of required continuing education?

Answer: CE completion certificates

CE completion certificates from approved providers are the standard documentation required by state boards for license renewal.

An enamel hatchet is classified as what type of cutting instrument?

Answer: Chisel

The enamel hatchet is a type of chisel with the blade set at an angle, used to cut and refine enamel walls.

An RDA moves from California to Texas. Which step is required before practicing in Texas?

Answer: Meet Texas-specific licensure requirements

Dental assistant licensure is state-specific, so the RDA must satisfy Texas's own application, exam, and fee requirements.

Which of the following best describes 'direct supervision' as it applies to dental assistant credentialing?

Answer: The dentist is present in the facility and can evaluate work before the patient leaves

Direct supervision means the dentist is on the premises, has diagnosed the condition, and evaluates the completed procedure before the patient is dismissed.

What is the correct compression-to-ventilation ratio for adult CPR according to the AHA?

Answer: 30:2

For adult CPR, the American Heart Association recommends 30 chest compressions followed by 2 rescue breaths (30:2 ratio) when performed by a trained rescuer.

Which error causes radiographic images to appear lighter (less dense) than normal?

Answer: Underexposure

Underexposure (too little radiation reaching the film/sensor) produces a light, low-density image that appears washed out and lacks proper contrast for diagnostic use.

What does 'res ipsa loquitur' mean in the context of dental malpractice?

Answer: The thing speaks for itself — negligence is obvious from the injury

Res ipsa loquitur is a legal doctrine meaning the injury itself is evidence of negligence without need for expert testimony.

Which disinfection level is required for semicritical instruments that are heat-sensitive?

Answer: High-level disinfection

Heat-sensitive semicritical instruments that cannot be sterilized must undergo high-level disinfection (HLD), which kills all microorganisms except large numbers of bacterial spores.