DDS Doctor of Dental Surgery MCQ 5 — Questions and Answers
Question 1: Which condition is characterized by bilateral enlargement of the parotid glands and keratoconjunctivitis sicca (dry eyes)?
- Mikulicz disease
- Sjögren syndrome (Correct answer)
- Sarcoidosis
- Mumps
Correct answer: Sjögren syndrome
Sjögren syndrome is an autoimmune exocrinopathy featuring bilateral parotid enlargement, xerostomia, and keratoconjunctivitis sicca due to lymphocytic infiltration of exocrine glands.
Question 2: When using the 'lost wax' technique in dental casting, the wax is eliminated during which step?
- Spruing
- Investing
- Burnout (Correct answer)
- Casting
Correct answer: Burnout
During burnout, the invested ring is heated in a furnace to completely eliminate (burn out) the wax pattern, creating a mold space for the molten metal.
Question 3: Which index measures the severity of periodontal disease by assessing loss of attachment and bone level?
- OHI-S (Oral Hygiene Index Simplified)
- DMFT index
- Periodontal Disease Index (PDI) (Correct answer)
- Community Periodontal Index (CPI)
Correct answer: Periodontal Disease Index (PDI)
The Periodontal Disease Index (PDI) evaluates gingival inflammation plus sulcus depth and attachment level, reflecting both tissue and bone changes.
Question 4: A patient presents with painless, bluish swelling on the floor of the mouth that fluctuates. The most likely diagnosis is:
- Dermoid cyst
- Ranula (Correct answer)
- Mucocele
- Ludwig's angina
Correct answer: Ranula
A ranula is a mucous retention phenomenon or extravasation cyst arising from the sublingual gland, presenting as a bluish, fluctuant swelling on the floor of the mouth.
Question 5: Which enamel developmental defect results from high fevers during amelogenesis and appears as horizontal lines across affected teeth?
- Fluorosis
- Enamel hypoplasia (Turner's tooth)
- Enamel hypocalcification
- Chronological hypoplasia (Correct answer)
Correct answer: Chronological hypoplasia
Chronological (systemic) hypoplasia results from systemic disturbances (fever, illness, malnutrition) during amelogenesis, producing horizontal bands across the affected dentition.
Question 6: Which articulator type is required to accurately reproduce eccentric jaw movements using individual patient records?
- Non-arcon simple hinge articulator
- Average value articulator
- Semi-adjustable articulator
- Fully adjustable articulator (Correct answer)
Correct answer: Fully adjustable articulator
A fully adjustable (arcon) articulator accepts individual pantographic or stereographic records and replicates the exact condylar guidance and Bennett angle of a specific patient.
Question 7: A dentist notices gingival fibromatosis in a patient taking which medication?
- Metformin
- Amlodipine
- Phenytoin (Correct answer)
- Prednisone
Correct answer: Phenytoin
Phenytoin (Dilantin), an anticonvulsant, is one of the classic causes of drug-induced gingival overgrowth (fibromatosis) along with cyclosporine and calcium channel blockers.
DDS Doctor of Dental Surgery MCQ 5
Which condition is characterized by bilateral enlargement of the parotid glands and keratoconjunctivitis sicca (dry eyes)?