不同表面处理对氧化锆陶瓷与牙本质粘接强度的影响

目的 比较喷砂、激光等不同机械处理对氧化锆陶瓷与牙本质粘接强度的影响.方法 制备4 mm×4 mm×6 mm尺寸的长方体瓷块80件,按空白对照及喷砂、Er:YAG激光、Nd:YAG激光、飞秒激光等不同表面处理方式随机分成5组(A～E组,n=16).使用扫描电镜观察表面形貌,轮廓仪测量粗糙度.用树脂粘接剂将瓷块与制备好的...

Effects of different surface treatments on the bonding strength of zirconia ceramics and dentin

Objective To compare the effects of different mechanical treatments such as sandblasting and laser on the shear bonding strength of zirconia ceramics and dentin.Methods Eighty blocks of zirconia cuboid specimens(4 mm×4 mm×6 mm)were prepared and randomly assigned into 5 groups(n=16)in accordance with their surface treatment:(A)untreated,as control;(B)sandblasted with Al2O3;(C)Er:YAG laser;(D)Nd:YAG laser;(E)femtosecond laser.Scanning electron microscopy was taken to observe surface morphology and profilometer was used to measure roughness.Zirconia blocks were cemented with 50 prepared dentin planes with resin cement.All samples were measured for shear bonding strength with a universal testing machine.Each specimen of interface destruction mode was observed using optical microscope.The data were analyzed by one-way ANOVA using SPSS 25.0 software.Results Scanning electron microscopy images showed that the micromorphology of the zirconia surface after different treatments changed significantly.The values of roughness from large to small were:Group B(1.29±0.25)μm,Group E(1.05±0.20)μm,Group C(0.66±0.11)μm,Group D(0.49±0.11)μm,Group A(0.34±0.07)μm.Groups B and E were larger than any other group(P<0.05).The shear bond strength values from large to small were:Group E(10.87±2.67)MPa,Group B(8.90±1.52)MPa,Group C(6.10±1.36)MPa,Group D(5.69±1.01)MPa,Group A(4.21±0.90)MPa.Groups E and B were larger than any other group(P<0.05),and Group E was larger than Group B(P<0.05).The differences in the values of roughness and shear bond strength were both statistically significant after surface treatments(P<0.05),the values of shear bond strength varied with the roughness and the variation tendency of the two were generally consistent.Conclusion Femtosecond laser and sandblasting can significantly roughen the surface of zirconia.So sufficient micromechanical interlocking effect is formed when zirconia ceramics and resin adhesive are bonded,which significantly improves the bonding strength.And femtosecond laser is the most ideal way to improve the shear bonding strength,which is a promising surface treatment for zirconia ceramic.