Dental Anatomy & Occlusion Flashcards

What is 'freeway space' (interocclusal distance)?

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

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.

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

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

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.

What is the dental formula for the permanent human dentition?

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

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

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

Answer: The mandibular position of maximum tooth contact regardless of condylar position

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).

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

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

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.

What is the typical overjet and overbite in an ideal Class I occlusion?

Answer: Overjet 2–4 mm; overbite 2–4 mm (covering approximately one-third of lower incisor)

In an ideal Class I occlusion, the overjet (horizontal overlap) is 2–4 mm and the overbite (vertical overlap) is 2–4 mm, covering approximately one-third of the lower incisor crown height.