EVALUATION OF ACCURACY OF TWO DIFFERENT IMPRESSION MATERIALS AND THREE DIFFERENT IMPRESSION TECHNIQUES ON THE VERTICAL MISFIT OF A THREE UNIT IMPLANT SUPPORTED FIXED DENTURE PROSTHESES

AN IN VITRO STUDY

Abstract

AIM: The aim of the study is to evaluate the accuracy of two different impression materials and three different impression techniques on the vertical misfit of a three-unit implant supported fixed denture prostheses.
Materials and Methods: A total of 60 casts were fabricated for the present study with a closed tray, open tray and open tray splinted abutment impression technique. Two different commercially available impression materials were used - polyether and addition silicone. Both the materials were used for all the above impression techniques.
Results: Accordingtotheresultderivedfromthisstudypolyethershowedleastmarginalgap.On the other hand on the basis of impression techniques open tray impression with splinted transfer coping also exhibited a minimum marginal gap.
Conclusion: 1. Higher marginal accuracy was found in impressions made by polyether compared to polyvinyl siloxane. 2. Open tray splinted technique exhibited a minimum marginal gap when used with polyether as impression material compared to open tray non splinted technique and closed tray technique.