ObjectiveThis study aims to investigate the influence of different adhesive materials on the shear bond strength of metal brackets bonded to porcelain surfaces.MethodsA total of 40 porcelain specimens were deglazed, etched, rinsed, dried, and treated with silane coupling agent. Then, the 40 porcelain specimens were divided into 4 groups. A total of 40 metal brackets were bonded to each group with the following 4 adhesive materials: light-cured composite resin(group A), one-component chemically cured composite resin(group B), resin-modified light-cured glass ionomer cements(group C), and two-component chemically cured resin adhesive(group D). All specimens were placed with surrounding air and then stored in an artificial saliva bath for 24 h. Shear bond strength was measured by an Instron universal testing machine. Statistical analyses were performed by ANOVA.ResultsThe shear bond strength of group A was the highest among those of the others(P<0 .05). meanwhile, the shear bond strength of group c was lower than that of group b(P<0 .05). no statistically significant difference was found between groups b and d and between groups c and d(P>0.05).ConclusionLight-cured composite resin can acquire the highest shear bond strength among those of the porcelain materials tested. Resin-modified light-cured glass ionomer cements were found unsuitable for use as adhesive to bond metal brackets onto porcelain surfaces.
