The effect of a zirconia primer on the shear bond strength of Y-TZP ceramic to three different core materials by using a self-adhesive resin cement

Abstract

Aim: Considering the importance of bond strength of zirconia ceramic to different core materials, this study aimed to evaluate the effect of a new zirconia primer, a mixture of organophosphate and carboxylic acid monomers, on the bond strength of zirconia to three core materials cemented with a self-adhesive resin cement. Materials and Methods: The study was done on 36 disk-shaped zirconia specimens in the case (receiving new zirconia primer) and control groups ( n = 18) and three core material subgroups ( n = 6) (amalgam, nickel–chromium [Ni-Cr], and composite resin). A self-adhesive resin-based luting agent bonded the two parts together. The shear bond strength was tested and the facture modes were determined. Two-way ANOVA and Tukey's honestly significant difference tests were used for data analyses (α = 0.05). Results: Zirconia primer could not significantly increase the bond strength of zirconia ceramic to different core materials ( P = 0.754). Composite resin and amalgam cores showed significantly higher bond strength than Ni-Cr core ( P = 0.001). On using zirconia primer, 100% of failures of composite resin cores were cohesive inside the core material, 75% in amalgam core and 100% in Ni-Cr core were adhesive. Conclusions: The use of new zirconia primer based on organophosphate/carboxylic acid monomers could not enhance the bond strength of zirconia ceramic to different core materials. The bond strength of zirconia to amalgam and composite resin cores was higher than that to Ni-Cr core material.

Revisión Sistemática de Protocolos de Cementación en Zirconio

“…Palacios en 2006 y Molin & Rodiger en 2008 en sus estudios in vitro concluyeron que no existe diferencia significativa entre una cementación convencional con ionómero de vidrio modificado con resina y un cemento de resina, pero aclaran que los cementos con contenido de fosfato de zinc dejan una brecha en el margen protésico y por ende tienden a la micro filtración causando degradación hidrolítica y alteración mecánica del cemento.1 Por el contrario muchos estudios afirman que dados los resultados de los test de micro y macro tensión que, el uso de cementos con contenido de 10-MDP brinda una adhesión significativamente superior en comparación al resto de cementos convencionales así como lo demostró Shahim en 2010 con sus estudios in vitro en el cual compara la fuerza de adhesión obtenida al cementar el zirconio con diferentes cementos que varían en su composición.9, 13, 16, 17 20, 30 Finalmente estudios confirman que el uso de primers usados por sí solos no tienen una relevancia en la adhesión, pero dada las condiciones adecuadas con un correcto arenado con partículas de alúmina mas el uso de un primer con contenido de MDP la adhesión es significativamente mayor, proporcionando una mayor resistencia a la tracción y mayor longevidad (Markus B. Blats). 3, 7, 10,11,12,26,27,28…”

Comparative evaluation of the shear bond strength of adhesive and self-adhesive resin luting agents to three commercially available composite core build-up materials: An in vitro study

“…Cast post and cores, silver amalgam, glass ionomer, resin-modified glass ionomer, and composite resin are used as CBM. [ 13 ] Composite CBM is widely used and may be chemical, light, or dual-cured. [ 14 ] Their physical and handling properties may lead the clinician to favor one material over another.…”

Comparative evaluation of shear bond strength at the interface of monolithic zirconia with two distinct core build-up materials: An in vitro study

“…[ 2 ] Therefore, applying hydrofluoric acid (5%–9.5%) and a subsequent silane-coupling agent does not help to its bonding. [ 3 ]…”

“…Carboxylic acid is the other constituent monomer in this primer, contributing to the bond’s development. [ 3 ]…”

“…The core build-up material should have desirable properties such as sufficient compressive strength, flexural strength, and biocompatibility with surrounding tissues and should also have a good bond with the tooth structure, pins, posts, and luting cement. Certain materials have been employed as core build-up materials such as casting core build-up, amalgam, composite resin, glass ionomer cement (GIC), porcelain, compomer, and cention N.[ 3 ]…”