电子散斑干涉在复合树脂固化收缩测试中的应用

Electronic Speckle Pattern Interferometry Method Applied to Measurement of Shrinkage Deformation of Light cured Composite Resin

摘要:

以光固化复合树脂固化收缩变形导致牙体修复失败这一临床问题为背景，运用电子散斑干涉法对R1，R2 两种不同型号光固化复合树脂填充到牙体后的离面收缩量进行了精确测量.实验得到了复合树脂固化过程中的电子散斑干涉条纹图.通过对干涉条纹图的处理，给出了不同情况下R1，R2型光固化复合树脂固化时最大离面收缩量与时间的关系，并且分析了影响复合树脂收缩变形的因素.研究表明随着牙体上窝洞的宽度的增大，复合树脂固化后的离面收缩也逐渐增大，但二者并非线性关系；R1型复合树脂收缩量较小，更加适合临床应用.

Abstract:

Shrinkage deformation of light cured composite resin is a major cause of the failure of dental restoration. Based on the electronic speckle pattern interferometry method (ESPI), the shrinkage deformation of light cured composite resins (Type R1 and Type R2) are measured under the different conditions. The ESPI patterns are obtained during shrinkage of the Type R1 and Type R2 According to these experimental results, the relative curves of the max out of plane displacement and time are plotted. The results show that the shrinkage deformation of light cured composite resin is connected with the width of the hole in the tooth. When the width increase, the shrinkage deformation increase as well, but there was no linear relation between them. The results also show that Type R1 is more suitable for clinical application.