ORE Part 1 Dental Anatomy & Occlusion 2

Question 1

What is 'freeway space' (interocclusal distance)?

Accepted Answer

The space between maxillary and mandibular teeth when the mandible is in the rest position, typically 2–4 mm

Answer

Freeway space (interocclusal clearance) is the vertical distance between the upper and lower teeth when the mandible is in rest position. It equals the difference between rest vertical dimension and occlusal vertical dimension.

Question 2

Which cusp is the 'key cusp' for occlusal stability in the mandibular first molar?

Accepted Answer

Mesiolingual cusp (cusp of Carabelli equivalent — actually the dominant cusp of the lower first molar)

Answer

The mesiolingual cusp of the mandibular first molar is the largest and most functionally significant cusp, occluding into the central fossa of the upper first molar. It is critical to occlusal stability.

Question 3

What is the dental formula for the permanent human dentition?

Accepted Answer

I 2/2, C 1/1, P 2/2, M 3/3 = 32 teeth total

Answer

The permanent human dental formula is: 2 incisors, 1 canine, 2 premolars, 3 molars per quadrant, totalling 32 teeth (including third molars/wisdom teeth).

Question 4

What is 'centric occlusion' (maximum intercuspation, MIP)?

Accepted Answer

The mandibular position of maximum tooth contact regardless of condylar position

Answer

Centric occlusion (now termed Maximum Intercuspal Position — MIP) is the occlusal position where maximum tooth contact occurs. It may or may not coincide with centric relation (condyles in terminal hinge position).

Question 5

What is the purpose of the 'curve of Spee'?

Accepted Answer

A naturally occurring anteroposterior curve of the occlusal plane facilitating efficient chewing and distributing occlusal forces

Answer

The Curve of Spee is the anteroposterior curvature of the dental occlusal plane (when viewed from the side). It reduces shear forces during function and is important in prosthodontic planning.

ORE Part 1 Practice Test

ORE Part 1 Practice Test

ORE Part 1 Dental Anatomy & Occlusion 2