Comparative Evaluation of Colour Stability Among Cad Cam and Resin Interim Restoration- an in Vitro Study

Abstract

The provisional restorations are used for an interim period in fixed prosthodontics. In a few situations, it can also be used as a long term provisional restoration. In the case of long term provisional restorations, the major concern is the aesthetics and function. In anterior tooth replacement, colour stability is the main criteria for selection of material. Colour stability can be affected by various reasons. The aim of the study is to evaluate the colour stability on CAD-CAM interim restoration and the conventional interim restoration. Eight samples each of heat cure provisional and CAD-CAM resin milled provisional are fabricated and tested in a toothbrush simulator for a period of 24hrs. The average period of abrasion is for 9 months. Pre-test and post-test measurement of its absorbance using spectrophotometer done. The results showed that CAD-CAM provisional restorations have better colour stability than conventional heat-cured provisional restorations even after 9 months. This can be due to less monomer residue, better mechanical properties. Colour stability is an important criterion when anterior restoration is concerned. Discolouration of the restoration can be due to various factors that may lead to patient dissatisfaction. The CAD-CAM provisional restorations can be a better choice as a long term provisional restoration in the aesthetic zone.