Evaluation of Remaining Dentin Thickness (RDT) Following Tooth Preparation for All Ceramic Crowns - An in Vitro Study.

Abstract

Statement of the problem: Enormous tooth substance is removed to receive all ceramic restorations which in turn affects the vitality of the tooth. Purpose of the Study: The purpose of this study is to measure the remaining dentin thichness (RDT) following tooth reduction for all ceramic crowns in freshly extracted premolars and to correlate RDT to Pulpal response. Materials and Methods: 45 freshly extracted human permanent maxillary first premolar teeth, scheduled to be removed for orthodontic purpose were selected from patients ranging from 16 to 30 years of age. The Samples were grouped by Three axial surfaces (Mesio Buccal (MB),Buccal (B) and and Disto-Buccal (DB) Axial Surfaces) , Three Age Groups (G1- 15 to 20, G2 – 21 to 25 , and G3 – 26 to 30) and finally by sex . Tooth preparation was done following standard guidelines for metal free restorations ( 1.2mm radial shoulder and as minimal taper clinically possible) by a single operator. RDT was measured in the three axial surfaces (Buccal, Mesio Buccal and Disto Buccal ) using a Stereomicroscope and Image Analysis Software. The results were statistically analyzed using f – test ( one way anova). Among the three surfaces Disto buccal showed the least RDT least RDT ( 0.97mm) followed by mesio-buccal (1.55mm) and buccal surface( 2.11mm). P<0.001.