Do occlusal contact areas of maximum closing position during gum chewing and intercuspal position coincide?
Do occlusal contact areas of maximum closing position during gum chewing and intercuspal position coincide?
复制标题
DOI：
10.1016/j.archoralbio.2011.07.004
复制
发表时间：
2011-12-01
影响因子：
3
通讯作者：
Hayasaki, Haruaki
中科院分区：
文献类型：
--
作者：
Iwase, Yoko;Saitoh, Issei;Hayasaki, Haruaki
目的：咬合接触面积（OCA）是食物粉碎过程中最重要的接触面积。最容易在最大牙尖交错位置（ICP）静态测量OCA。然而，动态最大闭合位置（MCP）和静态确定的ICP之间的一致性的假设尚未进行过测试。本研究的目的是介绍一种方法，定量OCA的所有牙齿在动态咀嚼，以确定是否在动态MCP咀嚼过程中的OCA是类似于静态确定的最大可能OCA.Design：13名健康女性参加了这项研究。形态牙齿形状的数据测量使用自动三维数字化仪从牙模型。使用具有6个自由度的光电分析系统记录咀嚼口香糖期间的下颌运动，并选择10个周期进行分析。结果：ICP和MCP时切牙位置的3D平均差异为0.129 mm，动态MCP时最大OCA为静态ICP时最大接触面积（69.46 mm（2））的98.5%（68.42 mm（2））。受试者之间和受试者内的变化是最少的动态MCP.Conclusion：咀嚼过程中的最大OCA是几乎相同的静态确定的最大可能的OCA。(C)2011爱思唯尔有限公司保留所有权利。
Objective: Occlusal contact area (OCA) is most important during the occlusal phase when food particles are being pulverized. OCA is most easily measured statically at the maximum intercuspal position (ICP). However, the assumption of coincidence between dynamic maximum closing position (MCP) and statically determined ICP has not been previously tested. The purpose of this study is to introduce a method of quantifying OCA of all teeth during dynamic mastication to determine whether the OCA at the dynamic MCP during chewing is similar to the statically determined maximum possible OCA.Design: Thirteen healthy females participated in this study. Morphologic tooth shape data were measured from dental models using an automatic 3D digitizer. Mandibular movement during gum chewing was recorded using an optoelectronic analysis system with 6 degrees of freedom, and ten cycles were selected for analysis. The dynamic OCA was estimated with a measurement system combining 3D tracking of mandibular movements with 3D digitization of tooth shape.Results: The estimated mean 3D difference between the incisor position at ICP and MCP was 0.129 mm. At the dynamic MCP, the maximum OCA was 98.5% (68.42 mm(2)) of the maximum possible contact area in the static ICP (69.46 mm(2)). Both between-subject and within-subject variation were least at the dynamic MCP.Conclusion: The maximum OCA during chewing is nearly identical to statically determined maximum possible OCA. (C) 2011 Elsevier Ltd. All rights reserved.