Abstract
Objective: to evaluate the effect of aluminum oxide sandblasting (AOS), argon plasma application (APL) and their combination (AOS+APL) on the shear bond strength (SBS) of dual-cure resin cement (Panavia F 2.0, Kuraray Noritake) to two zirconiabased ceramics (Lava, 3M ESPE and Katana, Kuraray Noritake). Material and Methods: One hundred twenty zirconia plates (13 mm in length X 5 mm in width X 1 mm in thickness) were prepared and treated according to the following treatments: 1- AOS, 2- APL,3- AOS+APL and 4- no treatment (control). After treatments, resin cement cylinders (1.4 mm in diameter x 1 mm in height) bonded to zirconia surface were obtained by filling up the silicon matrix. The shear bond test was performed following storage of the samples for 24 hours and one year. Bond strength values were recorded in MPa and the data were analyzed by three-way ANOVA and Tukey post-hoc test (preset alpha of 0.05). Results: In general, AOS and AOS+APL showed the higher SBS. After one-year storage, SBS of the resin cement to the Katana zirconia did not reduce, regardless of the zirconia surface treatment. Conclusion: AOS alone was able to increase the SBS of the resin cement to both zirconia ceramics compared to control and SBS remained stable after one year depending on type of zirconia ceramic.KeywordsAluminum Oxide; Ceramics; Plasma; Resin Cements
Highlights
Y ttria-stabilized tetragonal zirconia polycrystals (Y-TZP) have gained prominence in the field of Dentistry because of their favorable mechanical and aesthetic properties that enable this material to be used appropriately as an alternative for indirect restorations with metallic infrastructure
In order to test the ability of argon plasma to improve the bond strength, this study evaluated the effect of sandblasting with aluminum oxide, argon plasma application and their combination on the shear bond strength of resin cement to two Y-TZP ceramics
Means and standard deviations of shear bond strength obtained are presented in Table 1.Three-way analysis of variance (ANOVA) showed that bond strength results were influenced significantly by the treatmentused (p < 0.0001), type of zirconia (p < 0.0001) and storage period (p < 0.0001)
Summary
Y ttria-stabilized tetragonal zirconia polycrystals (Y-TZP) have gained prominence in the field of Dentistry because of their favorable mechanical and aesthetic properties that enable this material to be used appropriately as an alternative for indirect restorations with metallic infrastructure. Some studies have suggested combining micromechanical retention and chemical bonding in order to provide efficient adhesion of resin cements to zirconia ceramics. Studies have shown that the sandblasting with aluminum oxide abrasive particles creates roughness on the Y-TZP ceramic [3] and when compared to other types of treatments, such as laser irradiation [4] better bonding is obtained. These methods yield satisfactory results, the mechanical stress caused by the sandblasting with abrasive particles produces surface defects following the repetitive impacts of the aluminum oxide particles [5]. The damage generated may be detrimental in the long-term and the fatigue resistance of zirconia-based ceramics may decrease after sandblasting [6], as demonstrated by Zhang et al [7], in which sandblasting reduce zirconia flexural strength by up to 30% compared to well-polished specimens
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