Comparative study of ceramic-to-metal bonding

Abstract

Dentists and technicians have used dental ceramics associated with different types of alloys without taking into account the characteristics of compatibility of these materials. Knowing the properties of the alloy and ceramic used in metal/ceramic restorations is a key factor for treatment success. The purpose of this study was to evaluate the bond strength of a palladium-silver alloy (Pors-on 4) to 3 ceramics (Ceramco, Noritake and Vita VMK-68) using shear forces at the metal-ceramic interface. A stainless steel cylindrical matrix was used for preparation of the metal dies, application of ceramic and shear strength testing. Thirty palladium-silver alloy cylinders received two layers of opaque and two layers of body porcelain, and shear tests were performed in a universal testing machine at a cross-head speed of 0.5 mm/min. Shear bond strength means (in MPa) were: 28.21(Ceramco), 28.96 (Noritake) and 24.11 (Vita VMK-68). One-way ANOVA did not show statistically significant differences (p>0.05) among the materials. The results of this study indicate that the three evaluated ceramic systems are suitable to be used in combination with the tested palladium-silver alloy.

Effect of Firing Temperature at the Porcelain‐Metal Alloy Interface in Porcelain‐Fused‐to‐Metal Restorations. A SEM/EDS Study

“…This belongs to the polytypic family. Each Si atom is linked to 10 Cr neighbors (2+3 close Cr neighbors and 2+3 neighbors at a 2.48A and 2.56A) …”

Influence of low concentration acid treatment on lithium disilicate core/veneer ceramic bond strength

“…A cylindrical stainless steel matrix with 30mm diameter and 20mm length with a central perforation with 6.5mm depth and 6mm diameter was used to make the specimens and to perform shear strength tests as described by Scollaro et al (4). …”

“…First crowns fabricated in pure porcelain in this period showed low clinical performance, besides they were very difficult to manufacture. With the evolution of metal alloy casting technics and the knowledge about mechanical behavior and bonding of porcelains fused to metal, starting in 50s, there was a great development in the production of total crowns and fixed prosthodontics that combine these two materials (3,4). In the same way, crowns made fully in ceramic material can be fabricated using ceramic reinforced structures, as alumina infiltrate by glass, glass-ceramic reinforced by lithium disilicate, densely sintered aluminum oxide or yttria-stabilized tetragonal zirconia veneered with their respective porcelain of in order to achieve aesthetics characteristics (5).…”

Assessment of thicknesses and color properties of opaque porcelain layers applied by different dental technicians

“…Despite the increasing popularity of all-ceramic systems, metal-ceramic restorations (MCRs) are still the leading treatment option for fixed restorations (1)(2)(3). The combination of aesthetic and mechanical strength with low cost is one of the most important reason underlying the great success of MCRs since they emerged in the 1950s (4,5). In fact, quite aesthetic MCRs may be produced by talented dental technicians, despite some optical disadvantages of their metal substructures (6).…”