A Study on the Morphological Change of Tooth Crown due to the Occlusal Development with Use of the Three Dimensional Measuring System.

本研究的最终目的是为了证明在牙合生长发育过程中，牙合的形态与功能之间存在着相互的、不可缺少的关系。结果如下：1为了测量牙冠形态的表面轮廓，如咬合面或接触面，以及修复体或修复体与牙缘之间界面的口腔内变化，将有两个程序。包括使用划痕针的接触法和光学方法的非接触法。虽然每一种方法都有优缺点，但接触法对于特定点的测量非常有用和准确，例如标准化三维平面，而非接触法对于测量咬合面和接触面的表面轮廓是有效的本研究设计的计算机程序通过输入三个特定的点，然后将必要的信息反馈给三维平面以适当的角度进行三维倾斜，可以非常有效地对三维平面进行标准化。这在分析牙齿轮廓的三维微观变化时是有用的由于咬合功能的发展，咬合接触的三维变化与下颌三维运动方向的变化相协调应用于小儿牙科临床诊断异常的咬合关系，并在进行咬合指导治疗后获得较好的预后。

The ultimate goal of the study is to demonstrate the mutual and indispensable relationship between the form and function during the course of growth and development of the occlusion. The following results were obtained :1 In order to measure the surface contour of the tooth crown morphology such as the occlusal or contact facets and intra-oral change of restoration or interface between restoration and tooth margin, there will be two procedures. Those are the contact method with use of scratch needle and noncontact method by optical way. Although each method has advantageous and disadvantageous points, the contact method is very useful and accurate to measure the particular points, for example to standardize the three dimensional plane, while the non-contact method is efficient to measure the surface contour of the occlusal and contact facets.2 The computer program designed in this study was very effective to standardize the three dimensional plane by to input the three particular points and then the necessary information will be fed back to tilt the three dimensional plane at appropriate angle three dimensionally. This is useful when to analyze the three dimensional micro change of the tooth contour.3 The three dimensional change of occlusal contact was coordinated with the change in direction of three dimensional mandibular movement due to the development of the occlusal function.4 The Occlusat (by Fuji Film Co.) can be applicable in clinics of pediatric dentistry to diagnose the abnormal occlusal relationship and to make the better prognosis after the treatment of occlusal guidance.