[1] Oral Anatomy Lecture: Occlusion - Picket Fence

Source: https://www.youtube.com/watch?v=fxgD7Zxu1XA&t=1s

MD Central Incisors and MX 3rd Molars

Which teeth occlude with only 1 tooth in the opposing arch?

MX lateral opposes incisal edge of MD lateral & canine but opposes no teeth at its incisal edge.

Explanation:

In dental occlusion, the term "opposes" refers to how the maxillary (upper) and mandibular (lower) teeth interact or come into contact during biting and chewing.

1. The maxillary lateral incisor (MX lateral) primarily opposes the incisal edges of the mandibular lateral incisor (MD lateral) and the mandibular canine.

2. However, the incisal edge of the MX lateral incisor does not directly oppose any other tooth incisal edge-to-incisal edge. Instead, it typically comes into contact at a point just below its edge with the mandibular teeth during occlusion.

This setup helps prevent direct edge-to-edge contact, which would otherwise lead to faster wear on the incisal edges. Instead, the teeth interlock in a way that distributes forces more efficiently along their surfaces.

MX lateral opposes incisal edge of which teeth?

Facial embrasure of MD teeth

Cusp tip of MX canine is in direct alignment of which anatomical item?

MD 1st and 2nd PMs

MX 1st PM opposes which teeth?

MD 2nd PM and 1st M

MX 2nd PM opposes which tooth?

1. Marginal ridges

2. Central and distal fossa

Lingual cusps of MX posterior teeth oppose which anatomical items of which teeth?

Buccal grooves and embrasures

Buccal cusps of MX posterior teeth oppose which anatomical items of which teeth?

Buccal groove of MD 1st M

Mesiobuccal cusp of MX 1st M opposes what anatomical item of which tooth?

Developmental groove of MD 1st M

The distobuccal cusp of which tooth opposes which anatomical feature?

MX Central Incisors

MD central incisors contact which teeth during protrusion and lateral protrusion?

MX central incisors only — Distoincisal aspect of MD central opposes the lingual fossa of MX central

Explanation:

During protrusion, the mandibular central incisors contact only the maxillary central incisors, with the distoincisal aspect of the mandibular centrals opposing the lingual fossa of the maxillary centrals.

In lateral protrusion, this contact may also extend to the maxillary lateral incisors depending on the direction of movement.

MD Central opposes which aspect of which tooth?

Protrusion

When the lower jaw moves forward

Lateral protrusion

When the jaw moves forward and to the side

MMR area of MX 1st PM

Which anatomical feature does the buccal cusp of the mandibular first premolar contact on the opposing tooth?

The mesiobuccal cusp of the mandibular first molar contacts the mesiomarginal ridge (MMR) of the maxillary first molar and the distomarginal ridge (DMR) of the maxillary second molar.

Which anatomical features of the opposing teeth does the mesiobuccal cusp of the mandibular molar contact?