Can exert 80KG of force. Strongest muscle in body.
Pulls - counters masseter
Can close, open, move jaw
Important - inserts into
jaw in a sideways fashion
It pulls itself in anterior fashion,
pulling jaw forward
Muscle that you penetrate
when you give injections
Eminence/slope of bone that houses condyle
This prevents 100% forward movement
Everybody differs in degree here- no way to measure outside of surgery, but you can record it somewhat.
Terminal hinge axis
where mandible is hinging as it opens and closes. AKA Transverse
Side towards which
This one just moves
As this moves right, it moves
medially. Forward, downward,
Working condyle moves according to Bennett’s movement within the cone of Bennett.
= working movement
Bennett’s Side Shift
Explain: condyle is not a sphere, it is an oblong structure. Medial part is always backwards
compared to lateral part. Right image is from the top. Rotates as you move. Center shifts to the side
(this is the idea of the cone of bennett). It “pushes itself” in a way.
Centric occlusion 90%
90% of patients have a touch first
This point of contact is known as centric occlusion.
As you bite down, you get to maximal intercuspation.
What moves is what really bites. Upper
teeth will brace, lower jaw shoves/cuts
Anterior guidance is dictated by
- Position of the incisal edge of the mandibular anterior teeth relative to the lingual surfaces of the maxillary anterior teeth
- Changes in morphology of the lingual surfaces of maxillary anterior teeth.
- Length of mandibular incisors or canines
2. Canine guidance
Missing anterior guidance, have group function (molar contact)
The incisal guides on the articulator serve three functions:
- When anterior teeth are prepared, the angulation of the custom guide provides anterior guidance in place of the anterior teeth.
- When only posterior teeth are to be replaced, the angulation of the guide serves to estimate the buccolingual and mesiodistal cusp angles, so as to avoid interferences in both protrusive and non-working excursions.
- Reduce the amount of wear of the stone casts during excursive movements made on the articulator.