Abstract
Objective: The aim of this study was to compare the bond strength of High-Translucency zirconia (HT) and lithium disilicate dental ceramics, under different surface treatments. Material And Methods: For this, ceramics were divided into groups: Control Group (C) (n = 5), lithium disilicate sheets, conditioned with 10% hydrofluoric acid, followed by application of 37% phosphoric acid, silane and universal adhesive application; Group HTAI (n = 5), HT zirconia sheets were blasted with silica oxide, followed by the application of universal adhesive; Group HTPAI (n = 5), HT zirconia sheets were blasted with silica oxide, followed by the application of non-thermal plasma and universal adhesive and the HTP Group (n = 5), HT zirconia received only the application of non-thermal argon plasma. Subsequently, the specimens of each group were subjected to a cementation process with resin cement, obtaining cylinders. After 24 h of storage, in distilled water, at 37°C, the specimens were subjected to a mechanical micro-shear test. The data obtained were submitted to ANOVA One-way followed by the Tukey test (5%). Results: The HTP Group was excluded from the statistical analysis, as adhesions failed within the storage period. In addition, it was not possible to verify a statistical difference between the control group C and the experimental groups HTAI and HTPAI. Conclusion: The results showed that the applicability of high translucency zirconia can potentially be compared to the lithium disilicate bond strength, when submitted to the same surface treatments, except for the plasma application, which alone was not effective. KEYWORDS Lithium disilicate; Nonthermal plasma; Zirconia ceramic.
Highlights
Dental restoration aesthetics, the translucency of modern restorative materials, is an important concern to the current perspectives in dentistry [1]
Lithium disilicate ceramics arise as one of the mostly used restorative material, due to its advantages and prospective yielding clinical data [9]. This ceramic presents high values of bond strength and is composed of a silica matrix and lithium oxide (Li2O) crystals [10], for this reason, it was chosen as the control group of this study
Twenty ceramic sheets were made: 5 of lithium disilicate (E-Max – Ivoclar Vivadent Ltda – Tambore/Barueri/SP), where blocks of DS ceramic were sectioned on the ISOMET 1000 PRECISION SAW (BUEHLER - Lake Bluff llinoisUSA), obtaining sheets of 0.7 mm thickness and 15 of Highly translucent zirconia Zolid FX (Amann Girrbach Brasil Ltda - Curitiba - Paraná) frameworks were obtained through milling a solid block using CAD/CAM procedures and either of two systems in the EXOCAD software, and in the sequence by the SIRONA, in the thickness of 0.7 mm
Summary
The translucency of modern restorative materials, is an important concern to the current perspectives in dentistry [1]. Protocols, plans and techniques are constantly developed and improved, associating resistance, durability, biocompatibility, aesthetics and bond strength, increasing the results predictability [2,3] In this sense, dental ceramics offer favorable qualities for oral rehabilitation such as biocompatibility, resistance to chemical degradation, mechanical resistance, low conductivity and thermal diffusivity [4, 5]. Lithium disilicate ceramics arise as one of the mostly used restorative material, due to its advantages and prospective yielding clinical data [9] This ceramic presents high values of bond strength and is composed of a silica matrix and lithium oxide (Li2O) crystals [10], for this reason, it was chosen as the control group of this study
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