Effect of Metal Design and Technique on the Marginal Characteristics of the Collarless Metal-Ceramic Restoration.
Abstract
In 1983 Prince, Donovan, and Presswood described a method of fabricating collarless metal-ceramic restorations using synthetic wax as the binder for establishing the porcelain margin. Schrader et al. (1986) demonstrated the porcelain/wax technique resulted in 11.4% less shrinkage than a conventional liquid/porcelain technique. Gordner (1986) determined the decrease in porcelain shrinkage attained was due to an increase in porosity. As the ratio of porcelain to wax was increased, the shrinkage percentage, apparent specific gravity, and transverse rupture strength were decreased. When comparing porcelain/wax, direct-lift, and platinum foil techniques for margin fabrication, Cooney et al. (1985) found those produced by the porcelain/wax method yielded the poorest marginal adaptation. They stated modification of coping design and technique application might improve their results. The purposes of this investigation are to: (1) examine how the marginal characteristics of restorations fabricated with a porcelain/wax technique differ from those of a porcelain/liquid technique; (2) determine if metal coping design has any influence on marginal characteristics; and (3) evaluate the effect of labial margin fabrication on lingual margin adaptation.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1987
- Accession Number
- ADA185361
Entities
People
- Donald M. Belles
Organizations
- Air Force Institute of Technology