J Adhes Dent. 2018;20(5):379-387. doi: 10.3290/j.jad.a41309.
To evaluate the morphological properties, phase transformation, and microshear bond strength of composite cement to bioglass-coated zirconia surfaces treated with Nd:YAG laser.
Seventy-five zirconia disks were divided into five groups (n = 15). Group C received no surface treatment (control). Group S was subjected to sandblasting with 50-μm aluminum oxide particles. Group B samples were coated with bioglass 45S5. Groups BL9 and BL5 received bioglass coating and laser irradiation with 9 J/cm2 and 5 J/cm2 energy density. Morphological assessment was done using atomic force microscopy (AFM) and scanning electron microscopy (SEM). Zirconia phase transformation was assessed by XRD. Microhear bond strength testing was performed using a modified microtensile tester. The data were analyzed using the Welch test and the Games-Howell test (p < 0.05).
The sandblasted and bioglass-coated groups showed the highest bond strengths compared to other groups (p < 0.05). Group S showed the highest surface roughness and the highest frequency of cohesive failure. In all samples, the tetragonal phase decreased after surface treatment. Groups BL9 and BL5 showed some levels of tetragonal to cubic phase transformation.
Bioglass coating of zirconia surfaces (using the slurry method) can increase its microshear bond strength comparable to that of sandblasting. Surface roughness of sandblasted zirconia was the highest among all methods. Irradiation of Nd:YAG laser on bioglass-coated zirconia surfaces is not effective and decreases its bond strength compared to sandblasting and bioglass coating. Increasing the Nd:YAG laser energy density cannot increase the surface roughness of bioglass-coated zirconia surfaces. Bioglass coating results in transformation of the tetragonal to the cubic phase.
评估经 Nd:YAG 激光处理的涂有生物玻璃的氧化锆表面的复合水泥的形态特性、相变和微剪切结合强度。
将 75 个氧化锆圆盘分为五组（n = 15）。组 C 未进行表面处理（对照组）。组 S 用 50-μm 氧化铝颗粒喷砂处理。组 B 样品涂有生物玻璃 45S5。组 BL9 和 BL5 分别用 9 J/cm2 和 5 J/cm2 能量密度进行生物玻璃涂层和激光照射。使用原子力显微镜（AFM）和扫描电子显微镜（SEM）进行形态评估。通过 XRD 评估氧化锆的相变。使用改良的微拉伸试验机进行微剪切结合强度测试。使用 Welch 检验和 Games-Howell 检验（p < 0.05）对数据进行分析。
与其他组相比，喷砂和涂有生物玻璃的组显示出最高的结合强度（p < 0.05）。组 S 显示出最高的表面粗糙度和最高的内聚性失效频率。在所有样品中，四方相在表面处理后减少。组 BL9 和 BL5 显示出一定程度的四方相向立方相转变。
使用浆料法对氧化锆表面进行生物玻璃涂层可以提高其微剪切结合强度，与喷砂处理相当。喷砂氧化锆的表面粗糙度在所有方法中最高。对涂有生物玻璃的氧化锆表面进行 Nd:YAG 激光照射没有效果，与喷砂和涂有生物玻璃相比，会降低其结合强度。增加 Nd:YAG 激光能量密度不能增加涂有生物玻璃的氧化锆表面的粗糙度。生物玻璃涂层会导致四方相向立方相转变。
