Gonçalves F S, Popoff D A V, Castro C D L, Silva G C, Magalhães C S, Moreira A N
Eur J Prosthodont Restor Dent. 2011 Dec;19(4):163-6.
The aim of the present paper was to review the literature concerning the dimensional stability of dental elastomeric impression materials, to support recommendations to control the variables that influence the accuracy of these materials. An electronic search of the Scopus and PubMed databases was performed in November 2010. Articles were selected according to the following inclusion criteria: investigation of the dimensional stability of dental elastomers, an experimental study, sample size reported, laboratory tests described, and published in an English language peer-reviewed journal. The search resulted in 47 articles published between 1958 and 2008; of these, 24 were selected for inclusion in the present study. Great variability was discovered in the experimental methodologies used, such as different working times, temperatures and storage mediums for the impressions, impression techniques, material thicknesses, tray types, and methods of evaluation. Despite the lack of standardization among the studies, this review supports the following recommendations to control the dimensional stability: impressions should be stored at temperatures between 21 +/- 2 degrees C; polyether impressions should be stored in an environment with a relative humidity below 50%; time until pouring has been settled for each elastomer material.
本文旨在回顾有关牙科弹性印模材料尺寸稳定性的文献，以支持对影响这些材料准确性的变量进行控制的建议。2010年11月对Scopus和PubMed数据库进行了电子检索。根据以下纳入标准选择文章：牙科弹性体尺寸稳定性的研究、实验研究、报告的样本量、描述的实验室测试以及发表在英文同行评审期刊上。检索结果为1958年至2008年间发表的47篇文章；其中，24篇被选入本研究。在所使用的实验方法中发现了很大的差异，例如印模的不同工作时间、温度和储存介质、印模技术、材料厚度、托盘类型以及评估方法。尽管研究之间缺乏标准化，但本综述支持以下控制尺寸稳定性的建议：印模应储存在21±2摄氏度的温度下；聚醚印模应储存在相对湿度低于50%的环境中；每种弹性体材料的灌注时间已经确定。
