A Coating Agent for Promotion of Metal-to-Porcelain Bonding,
Abstract
Since the early 1950's, esthetic porcelain-fused-to-metal dental treatment devices have enjoyed wide clinical use. The following problems, however, initially encumbered the production of porcelain-metal dental restoration: (1) Fused porcelain displayed cracks after firing because of the mismatch of thermal expansion between the porcelain and the metal substructure; (2) the color of fused porcelain was altered adversely by color forming oxides and by technique; (3) relatively soft gold-based casting alloys lacked sufficient strength and rigidity to withstand rigorous functional service. Over the past decade, the foregoing difficulties have been reduced in frequency of occurrence and in severity. Today, the degree of bonding of fused porcelains to improved gold-containing (precious) alloys appears to be adequate. However, the mechanisms by which bonding occurs are not understood completely. Several explanations of the so-called porcelain-to-metal bond have been advanced. Van der Waal's forces, and the beneficial effects of compression forces resulting from small differences in thermal expansion of two dissimilar phases may contribute to bond formation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1978
- Accession Number
- ADA056450
Entities
People
- Eugene F. Huget
- Laszlo B. De Simon
Organizations
- United States Army Institute of Surgical Research