[Mechanical evaluation of crown restoration by means of laser holographic interferometry, with a primary regard to establish a system for an experimental method].

M Yamamura
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Abstract

This study was conducted to perform mechanical evaluations of crown restorations by Laser Holographic Interferometry (LHI). However, in an application of LHI, the Fujinon Holox FHLX-II system (He-Ne Gas Laser GLG-5700, NEC Co.) to this experiment, it was mandatory to do some modifications for loading and measuring evaluations, thereby a whole sequence of this system could be successfully carried out. The experiments were conducted in the following manner: Ten pieces of full cast crowns were constructed by a conventional procedure with 12% Au-Ag-Pd alloy and each test-piece was cemented alternately by zinc phosphate cement on a master die (stainless steel) with a chamfer margin. Successive vertical loadings (0kg-30kg) were applied for each test-piece and holograms were taken for crown restorations under loadings of both 15Kg & 30Kg with an accuracy of 0.3 micron. Three-dimensional measurements of nine points on surface of a testpiece were obtained through interference fringes, which were converted into mathematical values and statistical comparisons were performed for mean values under loadings of both 15 Kg & 30 Kg. The following results were obtained from this experiment. 1. It was successfully performed that an application of Laser Holographic Interferometry (a real time) became an efficient method with some modifications for mechanical evaluations of crown restorations. 2. Besides modification for rigid fixation of a test-piece, it made possible to conduct the loading experiment under Kg unit, which was impossible in previous studies. 3. Three-dimensional measurements were also made possible by an application of mathematical calculations, thereby a total system of experimental procedures was established. 4. Reference points were marked on surface of a test-piece, and this made possible to compare with the displacement values of other test-pieces. 5. Displacements of experimental crowns with both 15 Kg & 30 Kg under areas of loadings showed remarkably and they were gradually spread out toward the outer directions of restorations with slight displacements. From this experiment, it was proved that a cemented crown showed a certain deformational behavior under loadings. Therefore, this system contributes to become an efficient method evaluating mechanical features of crown restorations for further studies.

[激光全息干涉法对冠修复的力学评价,主要是建立一个实验方法的系统]。
本研究采用激光全息干涉法(LHI)对冠修复体进行力学评价。然而,在LHI的应用中,富士通Holox FHLX-II系统(NEC公司的He-Ne气体激光器GLG-5700)用于本实验,强制进行了一些修改以进行加载和测量评估,从而使该系统的整个序列能够成功进行。实验采用以下方法进行:采用常规方法用12% Au-Ag-Pd合金构建10个全铸冠,每个试件在带倒角边缘的主模(不锈钢)上交替用磷酸锌水泥胶结。对每个试件施加连续的垂直载荷(0kg-30kg),并在15Kg和30Kg载荷下拍摄全息图,精度为0.3微米。通过干涉条纹获得试样表面9个点的三维测量值,将其转换为数学值,并对15 Kg和30 Kg载荷下的平均值进行统计比较。实验结果如下:1. 通过对激光全息干涉测量技术的一些改进,成功地应用于冠修复体的力学评价中,成为一种有效的方法。2. 除了对试件进行刚性固定的修改外,还可以进行Kg单位的加载实验,这在以往的研究中是不可能的。3.通过数学计算的应用,三维测量也成为可能,从而建立了一个完整的实验程序系统。4. 在试件表面标记参考点,以便与其他试件的位移值进行比较。5. 15 Kg和30 Kg试验冠在加载面积下的位移表现明显,且位移逐渐向外扩散,且位移较小。试验结果表明,胶结冠在载荷作用下具有一定的变形特性。因此,该系统有助于成为评价冠修复体力学特性的有效方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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