Dirksen D, Runte C, Böröcz Z, Thomas C, von Bally G, Bollmann F
Laboratory of Biophysics, Institute of Experimental Audiology, University of Muenster, Muenster, Germany.
J Prosthet Dent. 2001 Feb;85(2):156-61. doi: 10.1067/mpr.2001.113630.
The analysis of occlusal contacts on mounted diagnostic casts is an important task in prosthetic diagnostics. However, it is still restricted mainly to qualitative aspects because existing measuring techniques fail to provide 3-dimensional data for more than a few single points in acceptable time.
The aim of this study was to develop a method for quantifying occlusal contacts and paths by using anatomically oriented diagnostic casts and to design the method to allow fast acquisition of digital 3-dimensional coordinates.
Plaster casts with color-marked contacts were digitized optically with a profilometric system based on the fringe projection technique. Digital camera images taken simultaneously were used to define the contact areas by marking them either manually or automatically with the help of image-processing routines. Three-dimensional coordinates were determined by finding the corresponding points within the profilometric data set.
Color-marked contact areas on diagnostic casts were successfully digitized with a computer-controlled, automatic setup in approximately 30 seconds. The accuracy of the acquired 3-dimensional data was estimated to be better than 60 microm in lateral and 30 microm in height resolution. The data set was visualized and evaluated in a skull related coordinate system.
This study verified the use of a new tool to quantify color-marked occlusal contacts on diagnostic casts in terms of spatial coordinates. The resulting digital data may be stored easily and analyzed numerically as well as visualized 3-dimensionally with computer graphic equipment. Because the anatomic orientation of the casts is maintained throughout the measurement process, it is possible to compare the data with electronically registered condyle paths and therefore to investigate, for example, their relation to the corresponding guidance paths of the frontal teeth and the canines in dynamic occlusion.
在修复诊断中，分析上架诊断模型上的咬合接触是一项重要任务。然而，由于现有测量技术无法在可接受的时间内为多个单点提供三维数据，其仍主要局限于定性方面。
本研究的目的是开发一种利用解剖学定位的诊断模型来量化咬合接触和路径的方法，并设计该方法以实现数字三维坐标的快速获取。
使用基于条纹投影技术的轮廓测量系统对带有彩色标记接触点的石膏模型进行光学数字化。同时拍摄的数码相机图像用于通过图像处理程序手动或自动标记来定义接触区域。通过在轮廓测量数据集中找到对应点来确定三维坐标。
诊断模型上带有彩色标记的接触区域通过计算机控制的自动设置在大约30秒内成功数字化。所获取三维数据的精度估计为横向分辨率优于60微米，高度分辨率优于30微米。数据集在与颅骨相关的坐标系中进行可视化和评估。
本研究验证了一种新工具在空间坐标方面对诊断模型上彩色标记的咬合接触进行量化的应用。所得数字数据可轻松存储，进行数值分析，并使用计算机图形设备进行三维可视化。由于在整个测量过程中模型的解剖学定位得以保持，因此可以将数据与电子记录的髁突路径进行比较，从而例如研究它们与动态咬合中前牙和尖牙相应引导路径的关系。
