title: Patterns and forces of occlusal contacts during lateral excursions recorded by the T-Scan II system in young Chinese adults with normal occlusions.
abstract: The objective was to characterise the patterns and forces of occlusal contacts during lateral mandibular excursions in a young Chinese adult population. Angle Class I normal occlusions in 85 dental students aged 20-29 were evaluated using the T-Scan II occlusal imaging and analysis system. The frequency of occlusal contacts was recorded for right and left lateral excursions at the position of lateral disclusion, at the canine-to-canine position and at the lateral maximal position. At the canine-to-canine position, the occlusal contact patterns were classified, and the relative forces were compared by multiple regression analysis, with α = 0·05. At the position of lateral disclusion, a high percentage of canine contacts (58·5%) and individual posterior tooth contacts on the working side was observed. At the canine-to-canine position, the canines on the working side contacted most frequently (68·9%), and the occlusal contact patterns could be classified into six groups. At the lateral maximal position, incisors (39·0%) and canines (32·3%) contacted most frequently. At the canine-to-canine position, subjects with occlusal contacts only on canines or on first premolars on the working side had the lowest relative occlusal forces (P < 0·001). Canine protection and group function do not identify all descriptors for lateral occlusal contact patterns in the natural dentition. Six occlusal contact patterns were found at the lateral canine-to-canine position.
authors.affiliation: Institute of Stomatology, Nanjing Medical University, China.
authors.forename: Y-L
authors.initials: YL
authors.lastname: Wang
authors.forename: J
authors.initials: J
authors.lastname: Cheng
authors.forename: Y-M
authors.initials: YM
authors.lastname: Chen
authors.forename: K H-K
authors.initials: KH
authors.lastname: Yip
authors.forename: R J
authors.initials: RJ
authors.lastname: Smales
authors.forename: X-M
authors.initials: XM
authors.lastname: Yin
mesh_terms: D000328:Adult; D044466:Asian People; D001732:Bite Force; D003766:Dental Occlusion; D003799:Dental Stress Analysis / Q000295:instrumentation* / Q000379:methods; D005260:Female; D006801:Humans; D007574:Jaw Relation Record / Q000295:instrumentation; D008297:Male; D008334:Mandible; D008409:Mastication / Q000502:physiology*; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*