Abraham Anamika, Jain Deshraj, Gupta Alka, Chakera J A
Department of Prosthodontics, Government College of Dentistry, Indore, Madhya Pradesh, India.
Principal & Head, Department of Prosthodontics, Government College of Dentistry, Indore, Madhya Pradesh, India.
J Lasers Med Sci. 2021 Nov 7;12:e71. doi: 10.34172/jlms.2021.71. eCollection 2021.
This study was conducted to assess the impact of nanosecond and femtosecond lasers on shear bond strength at the zirconia - veneering ceramic juncture. The first 60 samples of partially sintered zirconia cylindrical discs measuring 7 mm diameter and 4 mm height were milled and sintered. Then they were randomly divided into three groups namely group C (control, n=10), group N (Nd: YAG laser, n=10), and group T (Ti: sapphire laser n=40) which was further divided based on the duration of laser irradiation, into 4 subgroups (n=10 each) which were 30 seconds, 1 minute, 2 minutes and 3 minutes. Surface treatment was done on sintered zirconia discs based on the group. Following the treatment, the discs were ultrasonically cleaned followed by liner application (IPS Emax Zirliner, Ivoclar-Vivadent) and veneer ceramic layering (IPS e.max Ceram, Ivoclar-Vivadent) of 1.5 mm height. Each sample underwent shear stress in the universal test machine on the mounting jig, and bond strength was evaluated. Data were assessed using ANOVA followed by Tukey's post hoc multiple comparison analyses. According to one-way ANOVA, there was a significant difference in shear bond strength between the groups. Tukey's post hoc pair wise comparison test showed a significant difference ( value = 0.001) in shear bond strength of all pairs except group C and group N. The results of repeated measures, ANOVA (related and dependent groups) and Tukey's multiple pair wise comparison test showed that there was a significant difference ( value = 0.001) in shear bond strength at 30 seconds and all other groups. Ti: sapphire laser irradiation for 30 seconds can be used as potential surface treatment to increase shear bond strength at the zirconia-veneering ceramic juncture.
本研究旨在评估纳秒激光和飞秒激光对氧化锆-饰面陶瓷结合处剪切粘结强度的影响。首先对60个部分烧结的氧化锆圆柱形圆盘样品进行铣削和烧结，这些样品直径为7毫米，高度为4毫米。然后将它们随机分为三组，即C组（对照组，n = 10）、N组（钕:钇铝石榴石激光组，n = 10）和T组（钛:蓝宝石激光组，n = 40），T组再根据激光照射时间进一步分为4个亚组（每组n = 10），分别为30秒、1分钟、2分钟和3分钟。根据分组对烧结后的氧化锆圆盘进行表面处理。处理后，将圆盘进行超声清洗，然后涂抹衬层（义获嘉IPS Emax Zirliner）并铺设1.5毫米高的饰面陶瓷（义获嘉IPS e.max Ceram）。每个样品在万能试验机上的安装夹具上承受剪切应力，并评估粘结强度。数据采用方差分析（ANOVA），随后进行Tukey事后多重比较分析。根据单因素方差分析，各组之间的剪切粘结强度存在显著差异。Tukey事后成对比较检验显示，除C组和N组外，所有配对的剪切粘结强度均存在显著差异（P值 = 0.001）。重复测量方差分析（相关和依赖组）以及Tukey多重成对比较检验的结果表明，30秒照射组与所有其他组的剪切粘结强度存在显著差异（P值 = 0.001）。钛:蓝宝石激光照射30秒可作为一种潜在的表面处理方法，以提高氧化锆-饰面陶瓷结合处的剪切粘结强度。
