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A Clinical, Periodical and Physiological Evaluation of Changes in Masticatory Load Center and Function

咀嚼负荷中心和功能变化的临床、定期和生理学评估

基本信息

批准号：
08457653
负责人：
MATSUMOTO Makoto
金额：
$ 1.79万
依托单位：
Tokyo Medical and Dental University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

The aim of the study was to evaluate the unilateral shortened arch and occlusal rconstruction by RPD to elucidate relation between distribution of occlusal contacts and location of load center of masticatory musculature activities by EMG and Prescale.Distnbution of occlusal contacts and those loads, also location of load center were measured by extra-thin-layer of pressure indicator (Prescale Fuji Film Co.), with an exchusive analyzing computer system EMG of masticatory activities and occlusal contacts were recorded with Prescale at IP clenching. Ten bilateral shortened arch-cases were used as control and fifteen unilateral shortened dental arches contacts in unilateral shortened arc and after prosthdontic treatments, those occlusal loads, coordinates of the points and amounts, in relation masticatory functions were studied in periodically at pre and post RPD treatments. These data were analyzed and evaluated in those of control group. The outlines of these results were as follows ;I) The location of the occlusal load center in dentate mouth was in about median line of the maxillar first molar region, but in unilateral shortened arch the load center was biased about one premolar breadth anteriorly and inclined toward nemaining dentate side.2) The center of supporting area of unilateral shortened arch edentation was biased toward remaining side and slightly to incisal arch.3) Then after wearing eligible designed RPD for about one year, in unilateral edentate arc, the location of load cnter was improved as dentate arc, presuming physiological and functional recovery, and also activated masticatory musculatures.4) The prosthodontic restoration for unilateral edentate cases (unilateral shortened arch) was quite effective in clinical and physiological standpoints from the follow-up results in one year and 2 months.

本研究的目的是通过RPD评价单侧缩短的牙弓和咬合重建，以阐明咬合接触的分布与咀嚼肌肉活动负荷中心的位置之间的关系。用超薄压力指示器测量咬合接触分布和负荷中心的位置，并用计算机分析系统记录IP咬合时的咀嚼活动和咬合接触的肌电。以10例双侧缩短牙弓患者为对照，15例单侧缩短牙弓接触者，在修复治疗后，定期观察修复前后的咬合载荷、点的坐标和数量与咀嚼功能的关系。对对照组的数据进行分析和评价。这些结果的概要如下：1)牙合载荷中心位于上颌第一磨牙区的中线附近，而单侧缩短的牙弓，载荷中心向前偏约1个前磨牙宽度，向齿状面倾斜。2)单侧缩短的牙弓支撑区中心偏向剩余侧，略偏向切牙弓。3)配戴合格设计的RPD约一年后，在单侧齿状牙弓中，载荷中心位置改善为齿状弧，生理和功能恢复。4)从1年零2个月的随访结果来看，单侧缺牙(单侧牙弓缩短)的修复在临床和生理上都是非常有效的。