Pandey Pragya, Mantri Sneha, Bhasin Abhilasha, Deogade Suryakant C
Consultant Prosthodontist, Clove Dental, Jaipur, Rajasthan, India.
Department of Prosthodontics and Crown and Bridge, Hitkarini Dental College and Hospital, Jabalpur, Madhya Pradesh, India.
Contemp Clin Dent. 2019 Apr-Jun;10(2):203-207. doi: 10.4103/ccd.ccd_324_18.
A new elastomeric impression material which is a combination of vinyl polysiloxane (VPS) and polyether (PE) elastomers called "polyvinyl ether silicone" (PVES) has been introduced with predictable accuracy and high-quality impressions. There is insufficient data on mechanical properties of this material.
A comparative study of mechanical properties of VPS, PE, and PVES was carried out using light- and heavy-body consistencies of the three materials. Three standardized stainless steel molds were made to fabricate study specimens ( = 96). The specimens were tested for elastic recovery, strain under compression, tear energy, and tensile strength (TS) using the universal testing machine. Statistical analysis was done using two-way analysis of variance test.
Elastic recovery was higher in VPS as compared to other two materials. Strain under compression was higher for PE followed by PVES. Tensile energy was significantly higher in PVS while TS was higher in VPS, followed by PVES and PE.
PVES tested was found to be more flexible with high tensile energy. This material can be preferred in cases with undercut areas favoring the removal of impressions without tear and distortion.
一种新型弹性印模材料已被引入，它是乙烯基聚硅氧烷（VPS）和聚醚（PE）弹性体的组合，称为“聚乙烯醚硅酮”（PVES），具有可预测的准确性和高质量的印模。关于这种材料机械性能的数据不足。
使用三种材料的轻体和重体稠度对VPS、PE和PVES的机械性能进行了比较研究。制作了三个标准化不锈钢模具以制造研究标本（n = 96）。使用万能试验机对标本进行弹性恢复、压缩应变、撕裂能和拉伸强度（TS）测试。使用双向方差分析测试进行统计分析。
与其他两种材料相比，VPS的弹性恢复更高。PE的压缩应变更高，其次是PVES。PVS的拉伸能显著更高，而TS在VPS中更高，其次是PVES和PE。
测试发现PVES更具柔韧性且拉伸能高。在存在倒凹区域的情况下，这种材料更受青睐，有利于印模的取出而不会撕裂和变形。
