An In-Vitro Comparison Of Post Space Impression Using Two Different Technique With Polyvinylsiloxane And Vinyl Siloxane Ether Impression Material

Abstract

Purpose: To identify the best impression material and technique for completeness and voids free  post space impression.

Materials and method: 5 extracted maxillary central incisors mounted on acrylic block used and modified by biomechanical preparation of root canal and  filled with gutta purcha. Post space was prepared and impression were made using Polyvinylsiloxane and Vinyl Siloxane Ether using two different technique. Technique 1 performed only with anesthetic needle and 23 gauge orthodontic wire, whereas technique 2 performed with additional use of lenturospiral.  Data were collected and statistical analysis were done to identify best technique and material for completeness and voids free post space impression.

Results : There was statistical difference between technique 1 and 2 with Polyvinylsiloxane material [Group A = 68%, Group B = 88%] and no difference in both techniques while making impression with Vinyl Siloxane Ether material[Group B,D= 96%].  Maximum voids in post space impression were found in polyvinyl siloxane impression material using technique 1 [mean: 2.424] and least voids found in technique of impression making using Vinyl Siloxane Ether material [mean: 0.52]

Conclusion : Impression made with Vinyl Siloxane Ether impression material, with anesthetic needle, lenturospiral and 23 gauge orthodontic wire, is considered to be the better of Polyvinylsiloxane impression material.