不同表面处理方式对釉锆粘接强度的影响

Effects of different surface treatments on the bonding strength of novel self-glazed zirconia dental ceramics

目的:探析不同表面处理方式对釉锆粘接强度的影响。方法:采用三维胶态成型方式制备尺寸为φ×h=4×4mm的釉锆小圆柱共计42个,按不处理、0. 03mm、0. 06mm、0. 10mm 4种不同表面网格密度及喷砂、激光蚀刻、纳米工艺处理3种不同表面机械处理方式分为7组(A^G,n=6)对釉锆粘接面进行处理,与树脂粘接剂进行粘接试验,万能试验机测试剪切粘接强度,扫描电镜观察表面形貌及粘接界面破坏形式,对结果进行统计分析。结果:扫描电镜观察发现,网格处理各组与激光蚀刻组表面形貌与对照组相似,喷砂组及纳米工艺处理组表面形貌显著改变。不同表面网格密度组剪切强度分别为(12. 29±1. 25)MPa、(12. 86±1. 12)MPa、(13. 10±1. 80)MPa,与对照不处理组(12. 44±4. 14)MPa相比无显著提升,差异无统计学意义(P>0. 05)。喷砂组及纳米工艺处理组剪切强度分别为(20. 66±4. 78)MPa、(24. 01±7. 05)MPa,明显大于激光蚀刻组(9. 65±1. 30)MPa及对照组,差异有统计学意义(P<0. 05)。结论:喷砂处理改变釉锆表面形貌和粗糙度,对提升粘接强度有显著效果,纳米工艺处理后可获得预成型多孔纳米陶瓷粘接表面的釉锆,具有与喷砂处理后相当的剪切粘接力。

Objective: To study the effects of different surface treatments on the bonding strength of novel self-glazed zirconia dental ceramics. Methods: 42 blocks of self-glazed zirconia disc specimens(φ×h=4×4 mm) were manufactured by a precision additive three-dimensional gel deposition approach, which were randomly divided into 7 groups(n=6) according to surface treatment methods: A: No treatment;B: The surface mesh density was 0.03 mm;C: The surface mesh density was0.06 mm;D: The surface mesh density was 0.10 mm;E: Sandblasted with Al2 O3 particle;F: Irradiated with Er:YAG laser;G:A performed porous nanoceramic bonding surface treatment. Each group were cemented with self-adhesive resin cement.The shear bonding strength(SBS) test was performed using a universal testing machine. Fractured specimen interface was examined using optical microscope for the evaluation of the failure mode. The data were analyzed by One Way ANOVA with a 5% significance level. Results: Scanning electron microscopy(SEM) showed that surface morphology of groups with different surface mesh density and the Er:YAG laser group were similar to the control group. Sandblasted zirconia group and nanometer processing group showed different uneven surface morphology. The values of shear bond strength of groups with different surface mesh density were(12.29±1.25)MPa,(12.86±1.12)MPa and(13.10±1.80)MPa, which were similar to the control group(12.44±4.14)MPa without statistically significance(P>0.05). The values of shear bond strength of the sandblasting group and the nanometer processing group were(20.66±4.78)MPa and(24.01±7.05)MPa, which were higher than values of the control group and the Er:YAG laser group(9.65±1.30)MPa with statistically significance(P<0.05).Conclusion: Sandblasting with Al2 O3 particle affects the surface morphology and roughness of self-glazed zirconia, which improves the shear bond strength. The self-glazed zirconia with a preformed porous nanoceramic bonding surface obtains comparable shear bond force to the airborne particle abrasion.