ASSESSMENT OF SURFACE DETAILS REPRODUCTION & DIMENSIONAL ACCURACY OF GYPSUM MODELS RETRIEVED FROM VINYL SILOXANE ETHER IMPRESSIONS AFTER THEIR DISINFECTION

Abstract

Objectives: This study aims to investigate the surface details reproduction and dimensional accuracy of gypsum models retrieved from vinyl siloxane ether impression material after treatment with various modes of disinfection of the impression material.Materials and Methods: An observational study was carried out on a total number of 54 vinyl siloxane ether impressions that were subjected to three diff erent modes of disinfection i.e 3 % of Didecyldimethylammonium chloride , submersion in 2 % Glutaraldehyde solution for around 10 minutes and microwave disinfection for 8 minutes .The data analysis was done using , the paired-samples T-Test for the diff erence in dimensional change between pre and post-treatment of groups, for intergroup comparison, the One-Way ANOVA was used, SPSS version 21 .Numerical data was displayed in form of tables and charts.Results: There was no diff erence between the surface detail reproduction of gypsum models amongthe three diff erent methods of disinfection of the vinyl siloxane ether impression as there was 100 % surface detail reproduction in all 3 groups. A signifi cant diff erence in dimensional accuracy was detected in the gypsum models poured of vinyl siloxane ether treated with microwave disinfection (p<0.001 ) and no signifi cant change was recorded in the dimensional accuracy of groups treated with 3 % Didecyldimethylammonium chloride and submersion in 2 % Glutaraldehyde solution for10 minutes.Conclusion: Microwave disinfection had a remarkable impact on the dimensional accuracy of gypsum models so it should be used with care.