Year : 2017

Volume : Volume 7

Issue : Issue 3

Address for correspondence :
Suresh Khiyani
SureshKhiyani@gmail.com

Abstract

Aim:  One of the major problems of all ceramic restorations is their probable fracture against the occlusal force. The aim of the present in vitro study is to compare the effect of finish lines i.e. (shoulder and chamfer) on the fracture resistance of all ceramic restorations. Material and Methods: On an extracted maxillary central incisor chamfer & shoulder margin was prepared. Impressions were taken using a polyvinylsiloxane. The impressions were poured with stone to fabricate dies. Ceramic crowns were prepared by making wax pattern and press on technique. The crowns were then cemented on the tooth and underwent a fracture test with a universal testing machine and samples were investigated.  Results: Mean fracture resistance ranged from 120 to 270 N. Heat Pressed with shoulder finish line has highest fracture resistance. Conclusion: Within the limitations of this study, preparations done in shoulder preparation was significantly higher as compared to preparations  done in chamfer.

Keywords: Heat Pressed Crowns, Fracture Resistance of heat pressed crowns, Pressed crowns.