ADC ADC - Australian Dental Council Dental Anatomy and Occlusion Questions and Answers 1 — Questions and Answers
Question 1: How many cusps does a maxillary first molar typically have?
- 3
- 4 (Correct answer)
- 5
- 6
Correct answer: 4
The maxillary first molar typically has 4 major cusps: mesiobuccal, distobuccal, mesiolingual, and distolingual.
Question 2: Which tooth is known as the 'cornerstone' of the dental arch?
- Central incisor
- Lateral incisor
- Canine (Correct answer)
- First premolar
Correct answer: Canine
The canine is called the cornerstone of the dental arch because it is located at the corner of the arch and plays a key role in guiding occlusion.
Question 3: In Angle's Class II malocclusion, the mesiobuccal cusp of the maxillary first molar occludes:
- In the buccal groove of the mandibular first molar
- Mesial to the buccal groove of the mandibular first molar (Correct answer)
- Distal to the buccal groove of the mandibular first molar
- In the embrasure between the mandibular first and second molars
Correct answer: Mesial to the buccal groove of the mandibular first molar
In Class II malocclusion, the mandibular arch is positioned distally, so the mesiobuccal cusp of the upper first molar occludes mesial to the buccal groove of the lower first molar.
Question 4: The Curve of Spee is a curvature observed in which plane?
- Transverse plane
- Frontal plane
- Sagittal plane (Correct answer)
- Horizontal plane
Correct answer: Sagittal plane
The Curve of Spee is an anteroposterior (sagittal) curvature of the occlusal plane following the buccal cusps of mandibular posterior teeth.
Question 5: Which structure forms the primary reference point for determining the vertical dimension of occlusion?
- The maxillary central incisors
- The temporomandibular joint condyle
- The Frankfort horizontal plane
- The occlusal plane (Correct answer)
Correct answer: The occlusal plane
The occlusal plane is the primary clinical reference used to assess and re-establish vertical dimension of occlusion.
Question 6: What is the Bennett movement in mandibular kinematics?
- Protrusive movement of the mandible
- Lateral bodily shift of the mandible during lateral excursion (Correct answer)
- Rotational movement around the transverse hinge axis
- Retrusive glide from rest to centric occlusion
Correct answer: Lateral bodily shift of the mandible during lateral excursion
The Bennett movement is the lateral bodily shift of the mandible toward the working side during lateral excursion.
ADC ADC - Australian Dental Council Dental Anatomy and Occlusion Questions and Answers 1
How many cusps does a maxillary first molar typically have?