Special Laboratory of Lasers in Dentistry (LELO), Department of Restorative Dentistry, School of Dentistry of the University of São Paulo, São Paulo, SP, Brazil.
Lasers Med Sci. 2012 Jan;27(1):7-14. doi: 10.1007/s10103-010-0822-9. Epub 2010 Aug 25.
Tribochemical silica-coating is the recommended conditioning method for improving glass-infiltrated alumina composite adhesion to resin cement. High-intensity lasers have been considered as an alternative for this purpose. This study evaluated the morphological effects of Er,Cr:YSGG laser irradiation on aluminous ceramic, and verified the microtensile bond strength of composite resin to ceramic following silica coating or laser irradiation. In-Ceram Alumina ceramic blocks were polished, submitted to airborne particle abrasion (110 μm Al(2)O(3)), and conditioned with: (CG) tribochemical silica coating (110 μm SiO(2)) + silanization (control group); (L1-L10) Er,Cr:YSGG laser (2.78 μm, 20 Hz, 0.5 to 5.0 W) + silanization. Composite resin blocks were cemented to the ceramic blocks with resin cement. These sets were stored in 37°C distilled water (24 h), embedded in acrylic resin, and sectioned to produce bar specimens that were submitted to microtensile testing. Bond strength values (MPa) were statistically analyzed (α ≤0.05), and failure modes were determined. Additional ceramic blocks were conditioned for qualitative analysis of the topography under SEM. There were no significant differences among silicatization and laser treatments (p > 0.05). Microtensile bond strength ranged from 19.2 to 27.9 MPa, and coefficients of variation ranged from 30 to 55%. Mixed failure of adhesive interface was predominant in all groups (75-96%). No chromatic alteration, cracks or melting were observed after laser irradiation with all parameters tested. Surface conditioning of glass-infiltrated alumina composite with Er,Cr:YSGG laser should be considered an innovative alternative for promoting adhesion of ceramics to resin cement, since it resulted in similar bond strength values compared to the tribochemical treatment.
tribochemical 硅涂层是改善玻璃渗透氧化铝复合树脂粘结强度的推荐处理方法。高强度激光已被认为是一种替代方法。本研究评估了 Er，Cr：YSGG 激光照射对铝陶瓷的形态影响，并验证了在硅涂层或激光照射后复合树脂对陶瓷的微拉伸粘结强度。In-Ceram Alumina 陶瓷块经抛光后，进行气载颗粒喷砂处理（110 μm Al2O3），并用以下方法处理：（CG） tribochemical 硅涂层（110 μm SiO2）+硅烷化（对照组）；（L1-L10）Er，Cr：YSGG 激光（2.78 μm，20 Hz，0.5 至 5.0 W）+硅烷化。将复合树脂块用树脂粘结剂粘结到陶瓷块上。这些组合在 37°C 蒸馏水中（24 h）储存，嵌入丙烯酸树脂中，并切割成生产条状样本，然后进行微拉伸测试。使用统计方法分析粘结强度值（MPa）（α≤0.05），并确定失效模式。对 SEM 下的形貌进行了定性分析。硅烷化和激光处理之间没有显著差异（p＞0.05）。微拉伸粘结强度范围为 19.2 至 27.9 MPa，变异系数范围为 30 至 55%。所有组中均主要为混合性黏附界面失效（75-96%）。用所有测试参数进行激光照射后，未观察到颜色变化、裂纹或熔融。用 Er，Cr：YSGG 激光对玻璃渗透氧化铝复合材料进行表面处理应被视为促进陶瓷与树脂粘结的创新替代方法，因为它与 tribochemical 处理相比产生了相似的粘结强度值。
