Laboratório Especial de Laser em Odontologia, Departamento de Dentística, Faculdade de Odontologia, Universidade de São Paulo, Av. Prof. Lineu Prestes, 2227, São Paulo, SP, 05508-000, Brazil.
Facultade de Odontologia, Area de Rehabilitaçao Oral, Universidade Central do Equador, Av. Universitaria y Av. América, Quito, Ecuador.
Lasers Med Sci. 2021 Sep;36(7):1487-1495. doi: 10.1007/s10103-020-03205-w. Epub 2020 Nov 20.
To evaluate the effect of Er:YAG laser conditioning of a glass-infiltrated alumina-based zirconia-reinforced ceramic on its flexural strength and on bonding to a resin cement. Sixteen blocks (5 × 5 × 4 mm) and 50 discs (Ø 12 mm, 1 mm thickness) of In-Ceram Zirconia (ICZ) obtained from CAD-CAM blocks were infiltrated with glass. For the microtensile bond strength (μTBS) test, all blocks were treated with aluminum oxide (AOX) and divided into 4 groups (n = 4): G1 (AOX), no combined surface treatment; G2 (ROC), tribochemical silica-coating; G3 (EY200), Er:YAG laser 200 mJ/15 Hz; and G4 (EY250), Er:YAG laser 250 mJ/10 Hz. The ceramic blocks were silanated and cemented with a resin cement (Panavia F2.0/Kuraray) to composite resin blocks and subjected to the μTBS test. For the flexural strength evaluation, the discs were divided into 5 groups (n = 10) as described above, in addition to a control group (G5 - CTRL, mirror-polished without further treatment). Each surface treatment was submitted to qualitative evaluation under SEM. One-way ANOVA (α = 5%) revealed the highest bond strength value for EY200 with no significant difference from ROC. The groups AOX and EY250 showed similar μTBS values that were statistically lower than those of EY200. For flexural strength, ROC was the only group with significantly lower values when compared with the CTRL. The use of Er:YAG laser at 200 mJ/15 Hz can be considered an innovative and effective alternative for surface conditioning of ICZ since it did not reduce the flexural strength of the ceramic and improved the resin cement bond to this substrate.
为了评估 Er:YAG 激光对玻璃渗透氧化铝基氧化锆增强陶瓷的预处理对其弯曲强度和与树脂水泥结合的影响。从 CAD-CAM 块中获得了 16 个块（5×5×4mm）和 50 个圆盘（Ø 12mm，1mm 厚）的 In-Ceram Zirconia（ICZ）进行了玻璃渗透。对于微拉伸结合强度（μTBS）测试，所有块均用氧化铝（AOX）处理，并分为 4 组（n=4）：G1（AOX），无组合表面处理；G2（ROC），化学机械硅涂层；G3（EY200），Er:YAG 激光 200mJ/15Hz；G4（EY250），Er:YAG 激光 250mJ/10Hz。陶瓷块经过硅烷化并用树脂水泥（Panavia F2.0/Kuraray）与复合树脂块粘结，并进行μTBS 测试。对于弯曲强度评估，除了对照组（G5-CTRL，未经进一步处理的镜面抛光）外，圆盘还分为 5 组（n=10），如前所述。对每种表面处理方法进行 SEM 下的定性评估。单因素方差分析（α=5%）显示，EY200 的结合强度值最高，与 ROC 无显著差异。AOX 和 EY250 组的 μTBS 值相似，统计学上低于 EY200 组。对于弯曲强度，ROC 是唯一一组与 CTRL 相比值显著降低的组。使用 200mJ/15Hz 的 Er:YAG 激光可被认为是一种创新且有效的 ICZ 表面处理方法，因为它不会降低陶瓷的弯曲强度，并改善了该基底与树脂水泥的结合。
