Evaluation of the Accuracy of Two Impression Techniques for Angulated Implants

Abstract

The first step in achieving an accurate, passively fitting implant-supported prosthesis is to reproduce the relationships of dental implants through impression procedures. It is critical to record the three-dimensional orientation of the implant as it occurs intraorally, since imprecise superstructure fit can result in mechanical and biologic consequences that disrupt the function of dental implants. This study was designed to investigate -in vitro- the dimensional accuracy of 2 different impression techniques on angulated implants. Four triangular master models were constructed from cast acrylic sheets by using a computer software and a laser cutting machine. For each model, a drilling machine was used to drill 3 holes 25 mm apart arranged in a triangular pattern. Each hole received a dummy implant where the center implant was perpendicular to the top surface of the model and the lateral implants were placed with a 10º angluation from the center implant. The main groups were classified according to the depth of placement of the implants as follows: c) Group A: The implants were placed flushing with the top surface of the model. d) Group B: The implants were embedded 2mm below the top surface of the model.