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Abstract：
This study aims to evaluate the repair micro-shear bond strength of the CAD/CAM resin nanoceramic block treated using four different surface treatments and composite resins of different viscosities. For the current study, 96 samples with dimensions of 14 × 12 × 2 mm were obtained from a CAD/CAM resin nanoceramic block (Cerasmart) with a low-speed precision cutting saw under water cooling. The relevant samples were randomly divided into four groups according to the surface treatment processes: grinding with diamond bur, aluminum oxide airborne-particle abrasion, long-pulse laser, and short-pulse laser. Following silane application, universal adhesive was applied to all surface-treated samples and cured with an LED for 10 s. The samples prepared for the repair procedure were divided into two subgroups (microhybrid composite and injectable composite) according to the viscosity of the repair material to be used (n = 12). After the repair procedure, care was taken to keep the samples in distilled water in an incubator at 37 °C for 24 h. The repair micro-shear bond strength values (μSBSs) of CAD/CAM resin nanoceramic-composite resin complexes were tested. In addition, randomly selected samples from each group were examined with a scanning electron microscope to evaluate the surface topography after both surface treatments and the micro-shear bond strength test. Data were analyzed by two-way ANOVA and Bonferroni test. It was determined that the surface treatment preferred in the repair protocol significantly affected the μSBS value (p < 0.001). While the highest μSBS value was obtained with the short-pulse laser airradiation group, the lowest μSBS values were found in samples with long pulse laser irradiation. However, samples grinded with a bur and airborne-particle abrasion showed similar μSBS values (p > 0.05). The preferred composite viscosity in the repair procedure has a significant effect on the μSBS value (p < 0.001). However, the interaction between the surface treatment and the viscosity of the repair composite does not affect the μSBS values in a statistically significant way (p = 0.193). It may be recommended to clinicians to repair CAD/CAM resin nanoceramic restoration surfaces with injectable composites or after treatment with short-pulse lasers.
摘要：
本研究旨在评估使用四种不同的表面处理和不同粘度的复合树脂处理的CAD/CAM树脂纳米陶瓷块的修复微剪切粘结强度。对于目前的研究，从具有低速精密切割锯的CAD/CAM树脂纳米陶瓷块（Cerasmart）在水冷下获得96个尺寸为14×12×2mm的样品。根据表面处理工艺将相关样品随机分为四组:用金刚石钻头研磨，氧化铝空气颗粒磨损，长脉冲激光,和短脉冲激光.在硅烷应用之后,将通用粘合剂应用于所有表面处理的样品并用LED固化10s。根据要使用的修复材料的粘度(n=12),将为修复程序制备的样品分为两个子组(微混合复合材料和可注射复合材料)。修理程序后,注意将样品在37°C的培养箱中在蒸馏水中保持24小时。测试了CAD/CAM树脂纳米陶瓷-复合树脂复合物的修复微剪切粘结强度值(μSBSs)。此外,用扫描电子显微镜检查每组随机选择的样品，以评估表面处理和微剪切粘结强度测试后的表面形貌。通过双向ANOVA和Bonferroni检验分析数据。确定修复方案中优选的表面处理显著影响μSBS值(p<0.001)。虽然短脉冲激光空气照射组获得了最高的μSBS值，在长脉冲激光照射的样品中发现最低的μSBS值。然而,用钻头研磨和空气颗粒磨损的样品显示出相似的μSBS值(p>0.05)。修复程序中优选的复合粘度对μSBS值具有显著影响(p<0.001)。然而,表面处理和修复复合材料的粘度之间的相互作用不会以统计学上显著的方式影响μSBS值(p=0.193)。可能建议临床医生用可注射复合材料或用短脉冲激光治疗后修复CAD/CAM树脂纳米陶瓷修复表面。
