Shear bond strength between gingival composite resin and glazed gingival porcelain for implant‐supported prostheses

Abstract

This study determined the shear bond strength (SBS) between an indirect gingival composite resin and glazed gingival porcelain after various surface treatments. A total of 176 porcelain disks with natural glazing were used and assigned to one of four groups: no surface treatment, airborne‐particle abrasion, hydrofluoric acid etching, or a combination of airborne‐particle abrasion followed by hydrofluoric acid etching. Each group was divided into two subgroups: one subgroup was unprimed, and the other was silanized. An indirect composite resin was then bonded to the porcelain disks. Half of the specimens in each group (n = 11) were exposed to 5000 thermocycles. SBSs were measured, and data were analyzed with the Kruskal–Wallis and Steel–Dwass tests. Among silanized specimens, those treated with the combination of airborne‐particle abrasion and hydrofluoric acid etching exhibited the highest bond strengths both before and after thermocycling. However, the SBS values of the silanized and unprimed hydrofluoric acid etched specimens did not differ significantly. Airborne‐particle abrasion followed by hydrofluoric acid etching with silane application yielded stronger, more durable bonds between the indirect gingival composite resin and glazed gingival porcelain.

Aspects and Principles of Material Connections in Restorative Dentistry—A Comprehensive Review

“…According to Komine et al, the correct adhesion protocol of the feldspar ceramics to the composite should include three steps. First, it is necessary to perform sandblasting, then hydrofluoric acid etching and washing with water, and at the end, silane should be applied on the etched surface for creating proper chemical bonding [ 63 ]. Some methods of increasing the surface roughness remain controversial at least from the point of view of work safety, e.g., heating the HF acid to 70 °C, which, according to Del Rio et al, increases the bond strength of the composite material to ceramics [ 64 ].…”