Deposition of crystalline hydroxyapatite nano-particle on zirconia ceramic: a potential solution for the poor bonding characteristic of zirconia ceramics to resin cement

Abstract

The poor bonding strength of zirconia to different dental substrates is one of the challenging issues in restorative dentistry. Hydroxyapatite is an excellent biocompatible material with fine bonding properties. In this study, it was hypothesized that hydroxyapatite coating on zirconia would improve its bond strength. Forty-five zirconia blocks were prepared and randomly divided into three groups: hydroxyapatite coating, sandblasting, and no preparation (control). The blocks were bonded to cement and the micro-shear bond strength was measured following load application. The bond strength values were analyzed with the Kruskal-Wallis test in 3 groups and paired comparisons were made using the Mann-Whitney U test. The failure patterns of the specimens were studied by a stereomicroscope and a scanning electron microscope and then analyzed by the chi-square test (significance level = 0.05). Deposition of hydroxyapatite on the zirconia surface significantly improved its bond strength to the resin cement in comparison with the control specimens (p < 0.0001). Also, the bond strength was similar to the sandblasted group (p = 0.34). The sandblasted and control group only showed adhesive failure, but the hydroxyapatite coated group had mixed failures, indicating the better quality of bonding (p < 0.0001). As a final point, hydroxyapatite coating on the zirconia surface improved the bond strength quality and values.

Effectiveness of Surface Treatment With Blasted Bioceramic Materials on Implants Surfaces

“…Its stability could be explained by a combination of physical and tribo-mechanical bound to the underlying substrate. In contrast, when the same method was used on zirconia surfaces, the coatings were thin and non-uniform in comparison to the thermal spraying method [26].…”

Emergence of Nano-Dentistry as a Reality of Contemporary Dentistry

“…It has been established that nanoglass ceramics cause less abrasion of antagonist enamel than ordinary facing ceramics; in addition, nanoglass ceramics have demonstrated high strength under bending loads [88][89][90].…”

Two simple methods for surface modification of lithium disilicate dental blocks with hydroxyapatite

“…A similar study was done on zircon blocks by Azari et al [9] and compared thermal coating and air abrasion methods. As a result of the study, the crystalline HA structure was found in the thermal coating method while in the air abrasion method HA mini-islands were encountered.…”

“…As a result of the study, the crystalline HA structure was found in the thermal coating method while in the air abrasion method HA mini-islands were encountered. Another research conducted by Azari et al [10], suggested that HA coatings on zirconia blocks could be a solution for increasing the adhesion strength of resin cement. In another study on bone tissue formation, it was observed that HA coatings on zircon block contributed to the formation of new bone tissue [11].…”