ADC ADC - Australian Dental Council Dental Anatomy and Occlusion Questions and Answers 2 — Questions and Answers
Question 1: Which root of the mandibular first molar is typically broader buccolingually?
- Mesial root (Correct answer)
- Distal root
- Both roots are equal
- Lingual root
Correct answer: Mesial root
The mesial root of the mandibular first molar is broader buccolingually and commonly has two root canals.
Question 2: The working side condyle during lateral mandibular movement is called:
- Balancing condyle
- Rotating condyle (Correct answer)
- Orbiting condyle
- Protrusive condyle
Correct answer: Rotating condyle
The working side condyle rotates in place during lateral excursion and is sometimes called the rotating or ipsilateral condyle.
Question 3: How many root canals does the maxillary first premolar most commonly have?
- 1
- 2 (Correct answer)
- 3
- 4
Correct answer: 2
The maxillary first premolar most commonly has 2 root canals, one buccal and one palatal.
Question 4: The canine guidance (cuspid protected occlusion) means:
- Posterior teeth guide lateral movements
- The canines bear all lateral occlusal forces and disengage posterior teeth (Correct answer)
- All teeth share equal contact during lateral excursion
- The incisors protect the canines during lateral movement
Correct answer: The canines bear all lateral occlusal forces and disengage posterior teeth
In canine guidance, the canines bear lateral occlusal forces and cause disclusion of all posterior teeth during lateral excursions.
Question 5: Which developmental groove on the mandibular first molar separates the mesiobuccal and distobuccal cusps?
- Central groove
- Buccal groove (Correct answer)
- Lingual groove
- Distal groove
Correct answer: Buccal groove
The buccal groove of the mandibular first molar separates the mesiobuccal and distobuccal cusps on the buccal surface.
Question 6: Centric relation is best described as:
- Maximum intercuspation of teeth
- The most retruded position of the mandible with teeth in contact
- The musculoskeletally stable position of the condyle in the glenoid fossa (Correct answer)
- The rest position of the mandible
Correct answer: The musculoskeletally stable position of the condyle in the glenoid fossa
Centric relation is the musculoskeletally stable position of the condyle-disc assembly seated in the most superior-anterior position in the glenoid fossa.
ADC ADC - Australian Dental Council Dental Anatomy and Occlusion Questions and Answers 2
Which root of the mandibular first molar is typically broader buccolingually?