Department of Preventive Dental Sciences, College of Dentistry, University of Hail, 55476 Hail, Saudi Arabia.
Conservative Dentistry Unit, School of Dental Sciences, Universiti Sains Malaysia, Health Campus, Kubang Kerian, 16150 Kelantan, Malaysia.
Biomed Res Int. 2021 May 5;2021:5523242. doi: 10.1155/2021/5523242. eCollection 2021.
This study is aimed at assessing the influence of Nd:YAG, Er,Cr:YSGG laser irradiation, and adjunctive photodynamic therapy (aPDT) on the bond strength of zirconia posts to radicular dentin. Eighty extracted anterior teeth were randomly categorized into 4 groups ( = 20) based on varying laser irradiation treatments, i.e., conventional cleaning and shaping (CCS), Nd:YAG, Er,Cr:YSGG, and aPDT group, respectively. Using a cutting machine, the samples were prepared for push-out bond strength analysis; 4 sections (2 on each apical and cervical) of around 1 mm thickness were sectioned for all roots at a right angle to the long axis of the post. After making the space for the post, they were incorporated into the root system and were subjected to different laser treatments. The universal testing machine was utilized to assess the push-out bond strength, which had a defined 1 mm/minute crosshead speed until the failure was encountered. Specimens in the aPDT group (8.20 ± 2.14 MPa) demonstrated the highest mean push-out bond strength, whereas the lowest was shown by samples in the CCS group (7.08 ± 1.11 MPa). According to the independent -test, the mean push-out bond strength scores of the cervical segments were higher as compared to the apical segments in research groups ( < 0.05). Overall, the adhesive type was the most frequently encountered failure mode in all of the experimental groups, with the least number of failures observed in aPDT treated teeth samples. In conclusion, the push-out bond strength to radicular dentin was not much influenced by Nd:YAG, Er,Cr:YSGG laser, and aPDT in comparison with CCS. Although statistically not significant, however, the application of aPDT provided better outcomes as compared to other research groups.
本研究旨在评估 Nd:YAG、Er,Cr:YSGG 激光照射和辅助光动力疗法（aPDT）对氧化锆桩与根管牙本质粘结强度的影响。将 80 颗前磨牙随机分为 4 组（每组 20 颗），根据不同的激光处理方式进行分类，分别为常规清洗和成形（CCS）组、Nd:YAG 组、Er,Cr:YSGG 组和 aPDT 组。使用切割机，将样本制备用于推出粘结强度分析；将每个根尖和颈部分为 4 个部分（每个部分约 1mm 厚），以与桩的长轴成直角切割所有根。在为桩留出空间后，将它们纳入根系统并进行不同的激光处理。万能试验机用于评估推出粘结强度，其十字头速度设定为 1mm/min，直到发生失效。aPDT 组（8.20 ± 2.14 MPa）的样本显示出最高的平均推出粘结强度，而 CCS 组（7.08 ± 1.11 MPa）的样本则显示出最低的平均推出粘结强度。根据独立样本 t 检验，研究组中颈段的平均推出粘结强度评分高于根尖段（<0.05）。总体而言，在所有实验组中，最常见的失效模式是粘结剂类型，aPDT 处理的牙齿样本中观察到的失效数量最少。结论是，与 CCS 相比，Nd:YAG、Er,Cr:YSGG 激光和 aPDT 对根管牙本质的推出粘结强度影响不大。尽管没有统计学意义，但与其他研究组相比，aPDT 的应用提供了更好的结果。
