一种测量牙科复合材料聚合收缩率的简单方法。
A simple method for the measurement of polymerization shrinkage in dental composites.
作者信息
Cook W D, Forrest M, Goodwin A A
机构信息
Department of Materials Engineering, Monash University, Melbourne, Victoria, Australia.
出版信息
Dent Mater. 1999 Nov;15(6):447-9. doi: 10.1016/s0109-5641(99)00073-1.
OBJECTIVE
In this study a simple non-contact method was developed to measure the polymerization shrinkage of dental composites.
METHODS
A gas pycnometer was used to determine the volumes of specimens prior to and after photopolymerization and from which the total volumetric shrinkage could be determined.
RESULTS
Four commercial composites were studied and were found to have polymerization shrinkages varying from 1.6 to 2.5%. The method was found to be labour efficient and produced reproducible results with a standard deviation of approximately 10%.
SIGNIFICANCE
This method is appropriate for shrinkage measurements where only the total amount shrinkage is required and in particular for the measurement of shrinkage of photocured materials which are sensitive to water absorption.
目的
在本研究中，开发了一种简单的非接触方法来测量牙科复合材料的聚合收缩率。
方法
使用气体比重瓶测定光聚合前后样品的体积，并由此确定总体积收缩率。
结果
研究了四种市售复合材料，发现其聚合收缩率在1.6%至2.5%之间。该方法被发现具有高效性，且结果具有可重复性，标准偏差约为10%。
意义
该方法适用于仅需要测量总收缩量的收缩率测量，尤其适用于对吸水敏感的光固化材料的收缩率测量。
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