STEREOGRAMMETRIC ANALYSIS OF WEAR OF COMPOSITE

根据ADA对后部复合材料的验收计划， 咬合磨损不应超过250妈妈在五年的时间内， 临床服务 为了确定这种磨损量，或者与 建议使用触针的表面的标准或轮廓映射。 这些技术的局限性在于，它们要么使用较差的 定义的参考平面，或者表示不同状态的样本 必须安装在相同的位置。 此外，这两种方法 缺乏将局部磨损变化与微观形态学 变化 改进磨损测量方法需要：1）建立一个 固定参考平面，2）对样本定位不敏感，3） 局部磨损的定量，以及4）分析局部磨损的能力 微形态变化。 该项目的第一个目标是开发一个能够 对SEM照片进行立体摄影测量， 将这些测量数据传输到能够产生3D图像的微型计算机中， 研究表面的图。 将选择固定的解剖标志 用于确定参考平面。 因此， 所研究的表面和参考平面之间的距离可以是 识别和量化。 当定位到这样的局部变化时， 可以从SEM照片确定该区域的形态。 的 第二个目标是比较所提出的技术与基于 与标准进行目视比较。 五个牙医会估计 通过与标准相比较，在金属表面上切出凹槽。 以下 在此估计中，SEM立体摄影测量方法将用于 确定这些凹槽的深度。 这两个结果 将比较测定结果，并确定SEM的可靠性 将对立体摄影测量方法进行评估， 复合树脂磨损

According to the ADA acceptance program for posterior composite materials, occlusal wear should not exceed 250 Mum during a five year period of clinical service. To determine this amount of wear, either comparison with standards or profile mapping of the surface with a stylus are suggested. The limitations of these techniques are that they either use a poorly defined reference plane or that the samples representing different states of wear must be mounted in identical positions. In addition, both methods lack the ability to relate local wear changes to micro-morphological changes. Improved methods of wear measurement require: 1) the establishment of a fixed reference plane, 2) an insensitivity to specimen positioning, 3) the quantitation of localized wear, and 4) the capability to analyze local micro-morphological changes. The first objective of this project is to develop a system capable of performing stereophotogrammetric measurements on SEM photographs and transfer these measurements to a microcomputer capable of producing 3-D plots of the investigated surface. Fixed anatomic landmarks will be chosen for the determination of a reference plane. Thus, local changes in the distance between the investigated surface and the reference plane can be identified and quantified. When such a local change has been located, the morphology of this region can be determined from the SEM photographs. The second objective is to compare the proposed technique with a method based on visual comparison with standards. Five dentists will estimate the depth of grooves cut into metal surfaces by comparison with standards. Following this estimation, the SEM stereophotogrammetric method will be used to determine the depth of these grooves. The results of these two determinations will be compared and the reliability of the SEM stereophotogrammetric method will be evaluated for potential studies of composite resin wear.