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maxillary first molar occludes in the buccal groove of the permanent

mandibular first molar (Figure 5.8).

2. Angle Class II Occlusion

Angle Class II occlusion is the posterior relationship of the mandible to

the maxilla. The mesiobuccal cusp of the permanent maxillary first

molar occludes

mesial

to the buccal groove of the permanent mandibu-

lar first molar.

3. Angle Class III Occlusion

Angle Class III occlusion is the anterior relationship of the mandible to

the maxilla. The mesiobuccal cusp of the permanent maxillary first

molar occludes

distal

to the buccal groove of the permanent mandibular

first molar.

4. Maximum Intercuspation

Maximum intercuspation refers to the occlusal position of the mandible

in which the cusps of the teeth of both arches fully interpose them-

selves with the cusps of the teeth of the opposing arch. This position is

the goal in repositioning the teeth in proper occlusion during MMF.

5. Wear Facets

A wear facet is a highly polished wear pattern or spot on a tooth

produced by an opposing tooth from chewing or grinding. It is useful in

repositioning teeth into premorbid occlusion when a pre-existing

malocclusion was present (crowding, spacing, midline misalignment).

Figure 5.8

Molar relationship in

Class I occlusion,

mesiobuccal cusp

(MBC) of the upper

first molar occludes

with the buccal groove

(BG) of the lower first

molar.