DDS Doctor of Dental Surgery MCQ 2 — Questions and Answers
Question 1: Which nerve provides sensory innervation to the mandibular anterior teeth?
- Inferior alveolar nerve
- Mental nerve
- Incisive nerve (Correct answer)
- Lingual nerve
Correct answer: Incisive nerve
The incisive nerve, a terminal branch of the inferior alveolar nerve, innervates the mandibular anterior teeth and premolars.
Question 2: A patient presents with a 'moth-eaten' pattern of bone destruction on radiograph. This appearance is most characteristic of which condition?
- Chronic periapical abscess
- Osteosarcoma
- Osteomyelitis (Correct answer)
- Central giant cell granuloma
Correct answer: Osteomyelitis
Osteomyelitis classically produces a 'moth-eaten' pattern of bone destruction due to diffuse infiltration by the infectious process.
Question 3: Which salivary gland produces the highest proportion of serous secretion?
- Sublingual gland
- Submandibular gland
- Parotid gland (Correct answer)
- Minor mucous glands
Correct answer: Parotid gland
The parotid gland is purely serous and produces approximately 25% of total saliva but nearly all serous secretion.
Question 4: During a maxillary sinus lift procedure, which vessel is most commonly encountered and must be avoided?
- Posterior superior alveolar artery (Correct answer)
- Infraorbital artery
- Greater palatine artery
- Facial artery
Correct answer: Posterior superior alveolar artery
The posterior superior alveolar artery courses through the lateral sinus wall and is the vessel most frequently encountered during sinus lift procedures.
Question 5: Which class of antibiotics works by inhibiting bacterial cell wall synthesis by binding penicillin-binding proteins?
- Macrolides
- Tetracyclines
- Beta-lactams (Correct answer)
- Aminoglycosides
Correct answer: Beta-lactams
Beta-lactam antibiotics (penicillins, cephalosporins) inhibit transpeptidases (penicillin-binding proteins) needed for peptidoglycan cross-linking in the bacterial cell wall.
Question 6: A patient on warfarin therapy requires a tooth extraction. The target INR range to proceed safely is generally:
- Below 1.0
- 1.5–2.0
- 2.0–3.5 (Correct answer)
- Above 4.0
Correct answer: 2.0–3.5
Current evidence supports proceeding with simple extractions when INR is within the therapeutic range of 2.0–3.5 without altering anticoagulation therapy.
Question 7: The Angle Class II, Division 2 malocclusion is characterized by which combination of features?
- Protruded maxillary incisors and distal molar relationship
- Retroclined maxillary central incisors and distal molar relationship (Correct answer)
- Mesial molar relationship with crowding
- Anterior crossbite with normal molar relationship
Correct answer: Retroclined maxillary central incisors and distal molar relationship
Class II Division 2 features a distal molar relationship with retroclined (not protruded) maxillary central incisors and a deep overbite.
DDS Doctor of Dental Surgery MCQ 2
Which nerve provides sensory innervation to the mandibular anterior teeth?