Development of an objective and practical method to evaluate the morphology of edentulous alveolar ridges based on the analysis of the movement of complete dentures

基于全口义齿移动分析，开发客观实用的方法来评估无牙牙槽嵴的形态

基本信息

批准号：
18592107
负责人：
TAKAYAMA Yoshiyuki
金额：
$ 1.8万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

The purpose of this study was to develop a method to evaluate edentulous alveolar ridges based on the movement of the complete dentures calculated with finite element (FE) analysis. Edentulous cast and waxed complete dentures (78 mandibular, 38 maxillary, and 29 both) that passed trials were used. We made customized FE models, each consisting of mucosa and a denture from the surface data obtained using a non-contact 3-D digitizer. The FE analysis was performed under bilateral loads on artificial molars on each side on every case and unilateral loads on mandibular cases. We performed principal component analysis (PCA) of the displacement at three nodes on the dentures. Another PCA was performed with coordinates of the points on the grid defined by regularly dividing of the surface of alveolar ridges.The former PCA showed that the displacement of complete dentures could be expressed with a few principal components (PCs). The latter PCA showed that the morphology of each ridges could also be expressed with six or seven PCs. Although most of these morphological PCs were coincided with protocols previously suggested, others were considered to have been less attentive and to have a potential necessity for protocols to evaluate morphological factors of edentulous alveolar ridges.Next, we investigated the effect of morphology of the ridges on the displacement of dentures using multiple regression analysis with each "displacement" PC as dependent variables and "morphology" PCs as independent variables. However, the coefficients of determination were so low that the "morphology" PCs extracted in this study were considered to be insufficient to express or estimate the displacement of dentures. To progress this study, PCA for partial morphology, more sample size, focusing on "outlier" cases, and/or investigation of the effect of "morphological" PCs on function and prognosis were suggested.

本研究的目的是开发一种基于有限元 (FE) 分析计算的全口义齿运动来评估无牙牙槽嵴的方法。使用通过试验的无牙颌铸造和打蜡全口假牙（下颌 78 个，上颌 38 个，双侧 29 个）。我们根据使用非接触式 3D 数字化仪获得的表面数据制作了定制的 FE 模型，每个模型都包含粘膜和假牙。有限元分析是在每个病例两侧人工磨牙的双边载荷和下颌病例的单侧载荷下进行的。我们对义齿上三个节点的位移进行了主成分分析 (PCA)。另一种PCA是通过规则划分牙槽嵴表面定义的网格上的点坐标进行的。前一种PCA表明，全口义齿的位移可以用几个主成分（PC）来表示。后者的 PCA 显示每个脊的形态也可以用六或七个 PC 来表达。虽然这些形态学 PC 中的大多数与之前建议的方案一致，但其他人被认为不太注意，并且有潜在必要方案来评估无牙牙槽嵴的形态因素。接下来，我们研究了牙槽嵴形态对牙槽嵴的影响。使用多元回归分析计算假牙的位移，其中每个“位移”PC 作为因变量，“形态”PC 作为自变量。然而，决定系数太低，以至于本研究中提取的“形态”PC被认为不足以表达或估计假牙的位移。为了推进这项研究，建议采用部分形态学的PCA、更多的样本量、关注“异常”病例和/或研究“形态学”PC对功能和预后的影响。