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24 Cards in this Set
- Front
- Back
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Static Occlusion
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contact of maxillary teeth w/ stationary mandibular teeth
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Dynamic Occlusion
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Contact of maxillary teeth with moving mandibular teeth
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Class I Occlusion
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Mesiofacial cusp of maxillary first molar opposes the mesiobuccal developmental groove of the mandibular first molar.
78% of US population is Class I |
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Class II Occlusion
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Mandibular teeth are in distal relationship compared to Class I
20% of US population is Class II |
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Class III Occlusion
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Mandibular teeth are in a mesial relationship compared to Class I
2% of US population is Class III |
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Maximum Intercuspation/Centric Occlusion
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Position of the mandible when teeth are in full static interdigitation with the maxilla
aka convenience occlusion, habitual occlusion, maximum closure, etc. |
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Posterior Rules of Static Occlusion
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1. Maxillary lingual occlusal line lines up with central fossas on the mandibular.
2. Mandibular buccal occlusal line lines up with central fossas on the maxillary 3. Mandibular teeth are 1/2 tooth lingual (behind) and 1/2 tooth mesial to the maxillary teeth |
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Vertical dimension of occlusion (VDO)
Centric stops |
The distance between 2 selected points (1 mandibular and one maxillary) when the teeth are in maximum intercuspation.
The distance is determined by supporting cusps and opposing fossae (centric stops). |
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Supporting cusps (posterior teeth)
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Cusps that contact the opposing teeth along the central fossa line.
mandibular buccal cusps maxillary lingual cusps |
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Guiding/non-supporting cusps (posterior teeth)
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Cusps that overlap the opposing teeth
mandibular lingual cusps maxillary buccal cusps Sit in facial/lingual embrasures or in developmental grooves of opposing teeth |
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Platform area
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Diamond shaped area formed by 2 adjacent marginal ridges
Posterior supporting cusps sit in the platform areas Tooth to 2 tooth occlusion is most stable relationship, where one tooth cusp fits in the platform area formed by 2 teeth. Tooth to 1 tooth relationship is less stable |
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Exceptions to platform areas
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DB cusps of lower molars
ML cusps of upper molars |
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Anterior Rules of Static Occlusion
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1. Mandibular teeth are 1/2 tooth lingual and 1/2 tooth mesial to maxillary teeth (same as posterior)
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Overjet and Overbite
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Overjet--horizontal overlap of anterior teeth
Overbite--vertical overlap of anterior teeth There is an inverse relationship between overjet/overbite and VDO. +VDO = -overjet/overbite Overjet/overbite help prevent cheek biting and provide masticatory function and guidance |
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Vertical Dimension of Rest (VDR) and Freeway space
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VDR--The distance between 2 selected points when the mandible is at rest
Freeway Space--the space between mandibular and maxillary teeth at VDR |
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Determinants of Occlusion
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1. Teeth
2. Muscles 3. TMJ |
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Centric relation
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A maxilla to mandible relationship in which the condyles and discs are thought to be in the midmost, uppermost position.
Difficult to determine anatomically, but is determined clinically by assessing when the jaw can hinge on a fixed terminal axis (up to 25 mm) |
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Cross bite
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Mandibular teeth are facial to maxillary teeth (should be opposite)
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Wear facet
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Any wear line or plane on a tooth surface caused by attrition
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Laterotrusive contacts (working contacts)
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Contacts of teeth made on the side of occlusion toward which the mandible has been moved (side you chew on is working side)
Canines on working side are in contact |
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Mediotrusive contacts (balancing contacts)
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Non-working side contacts in which the working side canines are in contact.
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Premature contact
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A contact that displaces a tooth and diverts the mandible from its intended movement
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Mediotrusive (balancing) interferences
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Balancing contacts in which the working side canines are NOT in contact.
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Food impaction
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Forcing of food into interproximal area between teeth
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