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Relation between 3-D morphology of dental arch and jaw function.

牙弓 3-D 形态与颌功能之间的关系。

基本信息

批准号：
10671942
负责人：
NAGATA Junko
金额：
$ 2.05万
依托单位：
Kagoshima University Dental School (1999)宮崎医科大学 (1998)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

PurposeThe purpose of this study is to clarify the characteristics of three-dimensional morphology of dental arch and jaw function in humans from infancy to adulthood, and how the relation between them develops.Subjects and MethodsThe subjects selected in this study were divided into five developmental groups : group K at kindergarten ; group E at elementary school ; stage J at junior high school ; group H at high school ; group U at university. Each stage included 8 subjects. Jaw movement at incisal teeth, jaw muscles' activities, relation between both of them, and the three-dimensional measurements of dental arch were analyzed.Results1. The shape of jaw movement was vertical line at group K and like a tear drop in other groups.2. Jaw closing muscles' activities were significantly larger in group K.3. Jaw closing muscles were activated before the start of jaw closing in group K and after in other groups, and those onsets were significantly longer in group U.Jaw opening muscle as activated before the start of jaw opening at all groups, and its onset was significantly longer in groups K and P.4. Larger longer diameter of dental arch and smaller width of alveolar bone in group K, and larger palatal inclination in groups K and P were significantly shown. The palatal depth increased with age.5. In the subjects with unilateral chewing habit, the upper and lower dental arches less overlapped.DiscussionJaw function in group K seemed to be underdeveloped. At stage P, developed jaw movement was shown like as in groups J, H and U, however, relations between jaw movement and muscles' activities seemed to be underdeveloped. Especially in the subjects with unilateral chewing habit, it was suggested that jaw function closely related to the morphology of dental arch.

本研究的目的是阐明人类从婴儿期到成年期牙弓三维形态和颌骨功能的特点，以及它们之间的关系。大学里的U组。每个阶段包括8名受试者。分析下颌运动在切牙处的运动、下颌肌的活动、两者之间的关系以及牙弓的三维测量结果。K组下颌运动呈垂直线状，其余组呈泪滴状. K组大鼠下颌闭合肌活动度明显大于K组。在K组和其他组中，下颌闭合肌肉在下颌闭合开始之前被激活，并且在U组中这些发作时间显著较长。在所有组中，下颌张开肌肉在下颌张开开始之前被激活，并且其发作时间在K组和P组中显著较长。K组牙弓长径、牙槽骨宽度明显增大，K组和P组腭倾斜度明显增大。腭深随年龄增长而增加.单侧咀嚼者上下牙弓重叠较少。讨论K组颌功能欠发达。P期与J、H、U组一样，下颌运动发达，但下颌运动与肌肉活动的关系不发达。特别是在单侧咀嚼习惯的受试者中，提示颌功能与牙弓形态密切相关。