Abstract：
OBJECTIVE: 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.
METHODS: 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.
RESULTS: 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).
CONCLUSIONS: 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.
CONCLUSIONS: Ultrasonic activation of adhesive systems is a feasible strategy to enhance fiberglass posts retention in oncological patients.
METHODS: 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.
RESULTS: 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).
CONCLUSIONS: 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.
CONCLUSIONS: Ultrasonic activation of adhesive systems is a feasible strategy to enhance fiberglass posts retention in oncological patients.
摘要：
目的：本研究旨在评估超声激活蚀刻和冲洗和自蚀刻粘合剂体系对树脂水泥与辐照牙根牙本质的粘结强度的影响。
方法：将80颗上颌前牙分为8组（n=10），根据所用粘合剂系统的类型（蚀刻和冲洗和自蚀刻），粘合剂系统的超声波激活，和牙本质状况（辐照或未辐照-70Gy）。进行牙髓治疗，然后进行玻璃纤维后空间准备。玻璃纤维柱润滑后，在牙本质盘上横切根部,并进行推出粘结强度试验(0.5mm/min)。在立体显微镜和扫描电子显微镜（SEM）下分析断裂的试样，以进行失效模式分类。在SEM下分析其中一个牙质盘,以评估粘合剂界面的特性。
结果：辐照样品的粘结强度低于未辐照样品（P<0.0001）。两种粘合剂体系的超声活化均增加了树脂粘固剂与辐照牙本质的粘合强度（P<0.0001）。放射治疗显着影响中段（P=0.024）和顶端（P=0.032）（粘附失败）的失败模式。
结论：未照射的样本具有更均匀的粘附界面。当超声激活时，两种粘合剂系统都显示出更多的树脂标签，不管牙本质状况如何。
结论：超声激活粘合剂系统是提高肿瘤患者玻璃纤维桩固位的可行策略。
方法：将80颗上颌前牙分为8组（n=10），根据所用粘合剂系统的类型（蚀刻和冲洗和自蚀刻），粘合剂系统的超声波激活，和牙本质状况（辐照或未辐照-70Gy）。进行牙髓治疗，然后进行玻璃纤维后空间准备。玻璃纤维柱润滑后，在牙本质盘上横切根部,并进行推出粘结强度试验(0.5mm/min)。在立体显微镜和扫描电子显微镜（SEM）下分析断裂的试样，以进行失效模式分类。在SEM下分析其中一个牙质盘,以评估粘合剂界面的特性。
结果：辐照样品的粘结强度低于未辐照样品（P<0.0001）。两种粘合剂体系的超声活化均增加了树脂粘固剂与辐照牙本质的粘合强度（P<0.0001）。放射治疗显着影响中段（P=0.024）和顶端（P=0.032）（粘附失败）的失败模式。
结论：未照射的样本具有更均匀的粘附界面。当超声激活时，两种粘合剂系统都显示出更多的树脂标签，不管牙本质状况如何。
结论：超声激活粘合剂系统是提高肿瘤患者玻璃纤维桩固位的可行策略。
