Department of Dentistry, Endodontics Division, Federal University of Santa Catarina, Campus Reitor João David Ferreira Lima, Trindade, Florianópolis, Florianopolis, SC, CEP, 88040-900, Brazil.
Department of Radiotherapy, Oncology Research Center (CEPON), Florianópolis, SC, Brazil.
Clin Oral Investig. 2024 Jun 19;28(7):386. doi: 10.1007/s00784-024-05782-4.
This study aimed to evaluate the effect of ultrasonic activation of etch-and-rinse and self-etch adhesive systems on the bond strength of resin cement to irradiated root dentin.
Eighty human maxillary anterior teeth were distributed into 8 groups (n = 10), according to the type of adhesive system used (etch-and-rinse and self-etch), the ultrasonic activation of the adhesive systems, and the dentin condition (irradiated or non-irradiated - 70 Gy). Endodontic treatment was performed followed by fiberglass post-space preparation. After fiberglass posts' luting, the roots were transversely sectioned on dentin discs and submitted to the push-out bond strength test (0.5 mm/min). The fractured specimens were analyzed under a stereomicroscope and Scanning Electron Microscope (SEM) for failure mode classification. One of the dentin discs was analyzed under SEM to evaluate the characteristics of the adhesive interface.
Irradiated specimens had lower bond strength than non-irradiated specimens (P < 0.0001). Ultrasonic activation of both adhesive systems increased the bond strength of the resin cement to irradiated dentin (P < 0.0001). Radiotherapy significantly affected the failure mode in the middle (P = 0.024) and apical thirds (P = 0.032) (adhesive failure).
Non-irradiated specimens had a more homogeneous adhesive interface. When ultrasonically activated, both adhesive systems showed a greater number of resinous tags, regardless of the dentin condition.
Ultrasonic activation of adhesive systems is a feasible strategy to enhance fiberglass posts retention in oncological patients.
本研究旨在评估超声激活酸蚀-冲洗和自酸蚀黏接系统对受辐射牙本质的树脂水门汀黏接强度的影响。
80 颗上颌前牙根据黏接系统的类型（酸蚀-冲洗和自酸蚀）、黏接系统的超声激活以及牙本质状况（辐照或未辐照-70 Gy）分为 8 组（n = 10）。进行根管治疗后，制备纤维桩核空间。纤维桩黏固后，将牙根沿牙本质片横向切割，并进行推出黏接强度测试（0.5 mm/min）。根据断裂标本在立体显微镜和扫描电子显微镜（SEM）下的分析进行失效模式分类。对其中一个牙本质片进行 SEM 分析，以评估黏接界面的特征。
辐照标本的黏接强度低于未辐照标本（P < 0.0001）。两种黏接系统的超声激活均增加了树脂水门汀对受辐射牙本质的黏接强度（P < 0.0001）。放射治疗显著影响了中部（P = 0.024）和根尖部（P = 0.032）的失效模式（黏附性失败）。
未辐照标本的黏接界面更均匀。超声激活时，两种黏接系统均显示出更多的树脂突，无论牙本质状况如何。
黏接系统的超声激活是增强肿瘤患者纤维桩固位的一种可行策略。
