ORE Part 1 Dental Anatomy & Occlusion

Question 1

How many cusps does a maxillary first molar typically have?

Accepted Answer

4 cusps (with a 5th Cusp of Carabelli occasionally)

Answer

3 cusps

Answer

5 cusps always

Answer

6 cusps

Question 2

What is the angle formed between the occlusal plane and the condylar guidance path called?

Accepted Answer

The Fischer angle (or Bennett angle — actually these differ; the angle between condylar path and occlusal plane is the Balkwill angle)

Answer

The Bennett angle

Answer

The Frankfort angle

Answer

The Monson angle

Question 3

What is Angle's Class II Division 2 malocclusion characterised by?

Accepted Answer

Retrognathic mandible, upper central incisors retroclined, deep overbite, and increased overjet that may be masked by retroclination

Answer

Prognathic mandible with reverse overjet

Answer

Class I molar relationship with crowding

Answer

Bimaxillary proclination

Question 4

Which permanent tooth has the longest root?

Accepted Answer

Maxillary canine

Answer

Mandibular central incisor

Answer

Maxillary central incisor

Answer

Mandibular first molar

Question 5

In the primary dentition, which tooth does NOT have a permanent successor?

Accepted Answer

Primary second molar (replaced by a permanent premolar)

Answer

All primary teeth have permanent successors

Answer

Primary canine

Answer

Primary first molar

Question 6

What is the term for the physiological resting position of the mandible?

Accepted Answer

Postural rest position (mandibular rest position)

Answer

Centric occlusion

Answer

Retruded contact position

Answer

Maximum intercuspation