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Unformatted text preview: Angles classification of malocclusion - Uses the relationship of the maxillary and mandibular first molar Class I- (neurocclusion) molars are in normal relationship mesio-buccal cusp of the upper 1st molar occludes with buccal groove of the lower 1st molar Class II- (distoclusion) mesiobuccal cusp of maxillary 1st molar is mesial to the buccal groove of mandibular buccal groove of mandibular 1st molar Class III (mesiobuccal) cusp of maxillary 1st molar is distal to the buccal groove of the mandibular Purpose of positioner and when is it worn? Open bite- Upper and lower anteriors do not occlude, leaving open space between maxillary and mandibular anteriors where jaws are closed. Causes- thumb sucking, mouth breathing and genetics Overjet - Excessive protrusion of the maxillary incisors Overbite - Increased vertical overlap of the maxillary incisors Cross bite - A tooth is not properly aligned with its opposing tooth Arch Width - Use a bow divider to measure the distance from the tip of the cusp of the left cuspid to the tip of the cusp of...
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- Spring '10