Finnish Doctoral Program in Oral Sciences (FINDOS), University of Turku, Institute of Dentistry.
Department of Restorative Dentistry and Cariology, Adhesive Dentistry Research Group, Institute of Dentistry, University of Turku.
Dent Mater J. 2023 Nov 29;42(6):766-773. doi: 10.4012/dmj.2023-025. Epub 2023 Sep 21.
The aim of this study was to determine whether erbium laser irradiation emitted by modified glass-fiber tips would improve the intraradicular bonding of fiber posts. Forty human canines were endodontically treated and prepared for fiber-post placement. Roots were divided into five groups (n=8); according to the laser-tip combinations (2,940 nm Er:YAG and 2,780 nm Er,Cr:YSGG). Non-irradiated root canals served as control. Posts were cemented with self-adhesive resin cement and subjected to push-out test. Failure modes were characterized, and intraradicular bonded interfaces were analyzed by SEM and submitted to nanoleakage evaluation. Data were analyzed by two-way ANOVA and Tukey test (α=0.05). No significant differences were observed in cervical and middle sections (p>0.05), while significantly higher bond strengths were observed in apical sections (p<0.05). Laser irradiation reduced adhesive failures, cement-dentin gap formation, and nanoleakage apically. Laser-irradiation protocols employing end- or radial-firing tips improved bonding to apical intraradicular dentin contributing to more uniform bonded interfaces.
本研究旨在确定经改良玻璃纤维尖端发射的铒激光照射是否会改善纤维桩的根管内粘结。40 个人类恒齿经根管治疗并准备放置纤维桩。将牙根分为五组（n=8）；根据激光尖端组合（2,940nmEr:YAG 和 2,780nmEr,Cr:YSGG）。未照射的根管作为对照。用自粘树脂水门汀粘结桩，并进行推出试验。描述失效模式，并通过 SEM 分析根管内粘结界面，并进行纳米渗漏评估。数据采用双因素方差分析和 Tukey 检验（α=0.05）。在颈中和中部分段未观察到显著差异（p>0.05），而在根尖部分段观察到显著更高的粘结强度（p<0.05）。激光照射减少了根尖部的粘结失败、牙本质-粘结剂间隙形成和纳米渗漏。采用端射或径向发射尖端的激光照射方案改善了根尖内牙本质的粘结，有助于形成更均匀的粘结界面。
