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.

这项研究的目的是阐明从婴儿期到成年的人类牙齿弓和下巴功能的三维形态的特征，以及它们之间的关系如何发展。对本研究中选择的受试者被分为五个发展组：幼儿园的K组；小学E组；初中的J阶段；高中的H组； U组在大学。每个阶段都包括8个主题。分析了牙齿牙齿的下颌运动，下颌肌肉的活动，两者之间的关系以及牙齿拱门的三维测量值。下颌运动的形状是K组的垂直线，就像其他组的泪落下降一样。2。在K.3组中，下颌关闭肌肉的活动明显更大。下颌闭合肌肉在开始在K组中和其他组之后闭合之前就激活了肌肉，并且在所有组开始下颌开放之前被激活的U.Jaw张开肌肉中的这些发作明显更长，其发作显着且发作明显均显着组为K和P.4组更长。显着显示了牙齿弓的较大长直径和牙槽骨的较小宽度，并且在K组中较大的牙齿倾斜度较大。 pa骨深度随着年龄的增长而增加。5。在具有单方面咀嚼习惯的受试者中，上下牙齿拱门的重叠较小。d siscussionjaw在K组中的功能似乎不发达。在P阶段，开发的下巴运动如J，H和U组所示，但是，下颌运动与肌肉活动之间的关系似乎欠发达。尤其是在具有单方面咀嚼习惯的受试者中，建议与牙齿拱形的形态密切相关。