1Department of Prosrthodontics, Government Dental College and Hospital, Vijayawada, Andhra Pradesh, India
2Department of Prosthodontics, SIBAR Institute of Dental Sciences, Guntur, Andhrapradesh, India
*Corresponding Author: Dr. U. VARALAKSHMI, M.D.S, Assistant Professor, Department Of Prosthodontics, Govt. Dental College & Hospital, Vijayawada, Andhrapradesh. E mail: varalakshmi_prosdent@yahoo.co.in, Phone No; 9848926869
Online published on 5 November, 2016.
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.
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.
The study was done using 3 brass dies of 6mm height 10° taper with three different marginal designs shoulder, shoulder with 45° 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.
Marginal design, die spacer, shoulder, shoulder with bevel, chamfer
