Dimensional accuracy of implant impression obtained from polysiloxane condensation silicone

Abstract

Objective The aim of the study was to evaluate the dimensional accuracy of implant impressions obtained from different forms of polysiloxane condensation silicon impression materials. One of the major concerns in implant-retained prostheses is the accuracy of impressions. This plays an essential role in prosthesis implant adaptation.Materials and methods Two conventional dental implants were drilled into the interforamina area of a complete edentulous lower stone cast. Impressions were taken 10 times with each of the two impression materials. Each cast was measured three times, and the distances from the reference point at the center of the superior surface of implants were compared with the control model. ResultsAll stone casts obtained with the two techniques had significantly larger dimensions when compared with the original chromium cobalt model, on the basis of the t-test (t > 1.96), with percentage of change 13.77 for the casts obtained with the putty/light impression and 13.55 for stone casts obtained with medium impression material. There was insignificant difference between stone casts obtained from putty/light and medium consistency rubber-based impression material as (P > 0.05).