Effect of surface treatment methods on the shear bond strength of resin cement to zirconia ceramic

Lee, Ho Jeong; Ryu, Jae Jun; Shin, Sang Wan; Suh, Kyu Won

Abstract

STATEMENT OF PROBLEM: The aims of the study were to evaluate the effect of current surface conditioning methods on the bond strength of a resin composite luting cement bonded to ceramic surfaces and to identify the optimum cement type. MATERIAL AND METHODS: The sixty zirconia ceramic specimens(10 per group) with EVEREST milling machine and 60 tooth block were made. The zirconia ceramic surface was divided into two groups according to surface treatment: (1) airborne abrasion with 110micrometeraluminum oxide particles; (2) Rocatec system, tribochemical silica coating. The zirconia ceramic specimens were cemented to tooth block using resin cements. The tested resin cements were Rely X ARC, Panavia F and Superbond C and B. Each specimen was mounted in a jig of the universal testing machine for shear strength. The results were subjected to 2-way ANOVA and Post hoc tests was performed using Tukey, Scheffe, and Bonferroni test.
RESULTS
The mean value of shear bond strength(MPa) were as follows: RelyXARC(+Al2O3),5.35+/-1.69; RelyXARC(+Rocatec),8.50+/-2.13; PanaviaF(+Al2O3),9.58+/-1.13; PanaviaF(+Rocatec),12.98+/-1.71; Superbond C and B(+Al2O3),8.27+/-2.04; Superbond C and B(+Rocatec),14.46+/-2.39. There was a significant increase in the shear bond strength when the ceramic surface was subjected to the tribochemical treatment(Rocatec 3M) in all cement groups(P<0.05). Bonding strengths of cements applied to samples treated with Al2O3 were compared; Rely X ARC showed the lowest values, whereas Panavia F cement showed higher value than that of Superbond C and B group with no statistical significance. When the bond strength of cements with Rocatec treatment was compared, Rely X ARC showed lowest values. Overall, it was apparent that tribochemical treated Super-Bond possessed higher mean bond strength.(14.46MPa; P<0.05) than that of Panavia F cement group with no significance.
CONCLUSIONS
Silica coating followed silanization(Rocatec treatment) increase the bond strength between resin cement and zirconia ceramic. Panavia F containing phosphate monomer and Superbond C and B comprised of 4-META tend to bond chemically with zirconia ceramic, thus demonstrating higher bond strength compared to BisGMA resin cement. Superbond C and B has shown to have highest value of bonding strength to zirconia ceramic after Rocatec treatment compared to other cement.