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29 Cards in this Set
- Front
- Back
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Centric Relation
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Maxillomandibular relationship in which condyles articulate w/ thinnest avascular portion of their respetive disks w/ the complex in the ant-sup position against the shapes of the articular eminences
Position independent of tooth contact |
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Centric Occlusion
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Occlusion of opposing teeth when mandible is in centric relation
May or may not coincide w/ maximal intercuspal position |
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Maximum Intercuspation
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Complete intercuspation of opposing teeth independent of condylar position
Best fit of teeth regardless of condylar position |
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Occlusion
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Contact relationship of teeth in function & parafunction
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Excursive Movement
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Movement occuring when mandible moves away from maximum intercuspation
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TMJ is what type of joint?
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Ginglymoarthroidal joint
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Ginglymus refers to what type of movement?
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Hinge-like movement = Rotation
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Arthrodial refers to what type of movement?
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Glinding movement = Translation
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Position of condyle in rotational movement?
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Rotational movement=
Condyle seated in fossa or anterior to fossa |
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Where does rotational movement in joint occur?
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Occurs in inferior compartment of joint
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Where is condyle in translational movment?
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Condyle leaves fossa
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Where does movement in joint occur during translational movement?
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Occurs in superior compartment of joint
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What is a diarthrodial joint?
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Freely moving joint (capable of substantial movement)
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Which types of masticatory cycles are most frequently found in normal occlusions?
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Type I, II, III
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Which type of chewing cycle is found in 2% of normal occlusions?
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Type IV
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Which types of chewing cycles are not found in normal occlusions?
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Type V, VI, VII
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More recent studies in chewing cycles have identified what difference from the cycles described by Ahlgren?
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Most common forms have greater MD width (forms A & B have lest sharp apex)
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What are border movements?
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Most peripheral movements produced by mandible during: opening, closing, protrusion, retrusion & lateral movemetns
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What is the envelope of motion?
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3D space encompassed by these border movements
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Envelope of motion described by?
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Dr. Ulf Posselt
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Posselt described the superior view of the envelope of motion as what shape?
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Rhomboid
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Movement from retruded contact position to maximum hinge opening is?
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20mm
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Distance from retruded contact position to max opening is?
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40-60mm
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Maximum openings less than 35-40mm & mediolateral movement less than 7-8 are indicative of?
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Dysfunction in TMJ
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Average mediolateral dimensions?
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20 mm (10 R & 10 L)
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When does tooth contact occur during which part of masticatory cycle?
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During medial movement back to midline
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Types of condylar movements?
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Masticatory movements vs lateral mandibular movements
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Working side condyle is?
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Condyle on the side wehre food is being chewed
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Lateral translation of the working side condyle is known as ?
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Bennet movement or sideshift
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