Annals and Essences of Dentistry
Open Access

Abstract

AN EVALUATION OF THE EFFECTS OF MARGINAL DESIGN, DIE SPACER, AND SEATING FORCE ON THE MARGINAL FIT OF CAST METAL CROWNS AFTER LUTING – AN INVITRO STUDY

Vara Lakshmu U, Sudha madhuri D, Gopinath A

The marginal adaptation of cast metal crowns is essential for the success of cast restoration. The marginal design, die spacer and the seating force are considered as important factors effecting the marginal fit of cast metal crowns. Aims and Objectives; The aim and objectives of the present study is to evaluate the marginal fit of cast metal crowns 1.With three different marginal designs that are shoulder, shoulder with bevel and chamfer 2.With and without die spacer 3.Under seating forces 100N and 300N. METHODOLOGY: The study was done using 3 brass dies of 6mm height 10o taper with three different marginal designs shoulder, shoulder with 45o bevel and chamfer . 20 impressions of each metal die were made and casts were poured. 10 specimens of each group were coated with die spacer while the other 10 specimens were to serve as control group. Cementation done with GIC under two different seating forces (100N and 300N). The marginal discrepancy is determined by measuring the crown height before and after cementation. From this study it was concluded that specimen with combination of chamfer marginal design with die spacer under 300N seating force exhibited superior marginal adaptation.