Ulgey Melih, Zan Recai, Hubbezoglu Ihsan, Gorler Oguzhan, Uysalcan Gozde, Cotur Fatos
Department of Prosthodontics, Faculty of Dentistry, Sivas Cumhuriyet University, Sivas, Turkey.
Department of Endodontics, Faculty of Dentistry, Sivas Cumhuriyet University, Sivas, Turkey.
Lasers Med Sci. 2020 Aug;35(6):1385-1392. doi: 10.1007/s10103-020-02980-w. Epub 2020 Feb 14.
In clinical dentistry, the strength of bonding zirconia posts to root canal dentinal walls currently needs enhancement, and laser application can be an important contribution owing to its features that accommodate adjustable modifications on dental materials. Herein, the effect of different laser treatments applied to dentin surfaces on the strength of bonding zirconia posts to root canal dentinal walls is evaluated by using the pull-out bond strength test in a laboratory setting. A total of 40 single-rooted permanent mandibular premolar teeth that were freshly extracted were used here. The root canal preparation steps were performed using the crown-down technique. Custom-made zirconia posts were produced using CAD/CAM technology. Prior to the application of resin cement, the internal surfaces of the root canals were irradiated using Nd:YAG, Er:YAG, and KTP lasers. Pull-out tests were performed on each specimen by using a universal testing machine. One-way analysis of variance and Tukey post hoc tests were used to compare the pull-out bond strength data. The bond strengths of the laser-treated specimens were greater than those of the untreated controls (p < 0.05). While the value of the pull-out bond strength after Nd:YAG laser treatment was significantly higher than the values obtained after the applications of the Er:YAG and KTP lasers (p < 0.05), the pull-out bond strength after Er:YAG laser treatment was considerably greater than that after KTP laser treatment (p < 0.05). The bond strength between the root canal dentin and the CAD/CAM custom-made zirconia post was improved upon using all the laser modalities in current laboratory settings, among which, application of the Nd:YAG laser was the most successful.
在临床牙科中，目前将氧化锆桩粘结到根管牙本质壁上的强度需要提高，而激光应用因其能够对牙科材料进行可调节改性的特性，可能会做出重要贡献。在此，通过在实验室环境中使用拔出粘结强度测试，评估了应用于牙本质表面的不同激光处理对氧化锆桩与根管牙本质壁粘结强度的影响。这里共使用了40颗新鲜拔除的单根恒下颌前磨牙。根管预备步骤采用冠向下技术进行。使用CAD/CAM技术制作定制的氧化锆桩。在应用树脂水门汀之前，使用Nd:YAG、Er:YAG和KTP激光对根管的内表面进行照射。使用万能试验机对每个样本进行拔出测试。采用单因素方差分析和Tukey事后检验来比较拔出粘结强度数据。激光处理样本的粘结强度大于未处理的对照组（p < 0.05）。虽然Nd:YAG激光处理后的拔出粘结强度值显著高于Er:YAG和KTP激光处理后获得的值（p < 0.05），但Er:YAG激光处理后的拔出粘结强度明显大于KTP激光处理后的强度（p < 0.05）。在当前实验室环境中，使用所有激光方式都提高了根管牙本质与CAD/CAM定制氧化锆桩之间的粘结强度，其中，Nd:YAG激光的应用最为成功。
