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Usually the first half inch (16mm) of opening
Rotational center is at the condyle
Second part of opening
Movement down the articular eminence
Rotational center moves to the angle of the mandible
Arc of movement more acute than in rotational
Condyles are in a most retruded physiologic position
Condyles assume a superior position against the articular disk and the stress bearing surface of the articular eminence
Stamp cusps of the max posterior teeth occlude in the fossae and/or on the marginal ridges of the mand teeth
Stamp cusps of the mand posterior teeth occlude in the fossae and/or on the marginal ridges of the max teeth
The anatomical determinants of occlusion
Movement of the condyles in the horizontal plane. It includes laterotrusion and mediotrusion
The path of the mandibular condyles can be studied through the recording of mandibular movement with a
Pantographic tracing device
The amount of detrusion determines..
.. how long the cusps can be and how deep the fossae can be
Also affects the amount of concavity of the anterior teeth
An increase in laterotrusion requires...
... the ridge and groove direction of the mandibular posterior teeth to be more mesial and on the maxillary teeth to be more distal
Shorters cusps for all posterior teeth (to avoid interference)
Greater concavity of max cuspid lingual surface
If the W.C. moves up
Cusps MUST be shorter
Fossae MUST be shallower
Lingual concavity of the anterior teeth MUST be greater
If the W.C. moves down
Cusps MAY be longer
Fossae MAY be deeper
Lingual concavity of the anterior teeth MAY be less
W.C. moves forward as it moves laterally
Mandibular grooves more Distal
Maxillary grooves more Mesial
Concavity must be greater
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