Department of Prosthodontics, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, 250012, China.
Department of Endodontics, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, 250012, China.
Clin Oral Investig. 2021 Apr;25(4):1979-1988. doi: 10.1007/s00784-020-03506-y. Epub 2020 Aug 11.
The purpose of this in vitro study was to investigate the effects of different air-abrasion pressures on flexural strength and shear bond strength of a translucent zirconia.
The translucent zirconia surface was treated with 50 μm abrasive alumina particles at different pressure: 0.1 MPa; 0.2 MPa; 0.3 MPa; 0.4 MPa; 0.5 MPa; untreated specimens were used as control group (n = 33). For each group, three-point bending test was used to evaluate the flexural strength, and surface characterizations were analyzed. Following adhesive bonding and water storage for 24 h, specimens were subdivided into groups baseline and aged (5000 thermocycles). Then, shear bond strength was measured and failure mode was recorded. Statistical analysis was performed with one-way ANOVA and Tukey test (α = 0.05).
Increasing air-abrasion pressure (0.3 MPa, 0.4 MPa, and 0.5 MPa) decreased the flexural strength. Higher air-abrasion pressure resulted in rougher zirconia surfaces and caused more microcracks. The highest shear bond strength was obtained for zirconia surfaces abraded at 0.2 MPa (15.88 ± 2.70 MPa) and 0.3 MPa (14.32 ± 1.12 MPa). Aging did not decrease the strength for all groups except control group (p < 0.001).
Air-abrasion with 50 μm abrasive alumina particles at 0.2 MPa could achieve good strength for translucent zirconia ceramics while maintaining adequate and durable bonding with resin cement.
A total of 0.2 MPa is recommended for air-abrasion procedure applied before a dental restoration fabricated with translucent zirconia is bonded to resin cement.
本体外研究旨在探讨不同喷砂压力对半透明氧化锆弯曲强度和剪切粘结强度的影响。
使用 50μm 氧化铝磨料颗粒以不同压力（0.1 MPa；0.2 MPa；0.3 MPa；0.4 MPa；0.5 MPa）处理半透明氧化锆表面，未处理的标本作为对照组（n = 33）。对于每组，使用三点弯曲试验评估弯曲强度，并分析表面特性。在粘合和水储存 24 h 后，将样本分为基线组和老化组（5000 次热循环）。然后，测量剪切粘结强度并记录失效模式。采用单因素方差分析和 Tukey 检验（α = 0.05）进行统计学分析。
随着喷砂压力（0.3 MPa、0.4 MPa 和 0.5 MPa）的增加，弯曲强度降低。较高的喷砂压力导致氧化锆表面更粗糙，并产生更多微裂纹。在 0.2 MPa（15.88 ± 2.70 MPa）和 0.3 MPa（14.32 ± 1.12 MPa）下喷砂的氧化锆表面获得最高的剪切粘结强度。除对照组外（p < 0.001），所有组的老化均未降低强度。
使用 50μm 氧化铝磨料颗粒以 0.2 MPa 的喷砂压力可以对半透明氧化锆陶瓷实现良好的强度，同时保持与树脂水泥足够和持久的粘结。
建议在将用半透明氧化锆制作的牙科修复体用树脂水泥粘结之前，采用总压力为 0.2 MPa 的喷砂程序。
