Graduate student, Department of Conservative Dentistry, School of Dentistry, Rio Grande do Sul Federal University (UFRGS), Porto Alegre, RS, Brazil.
Master student, Department of Conservative Dentistry, School of Dentistry, Rio Grande do Sul Federal University (UFRGS), Porto Alegre, RS, Brazil.
J Prosthet Dent. 2022 Feb;127(2):295-301. doi: 10.1016/j.prosdent.2020.07.025. Epub 2020 Nov 24.
Whether ultrasonic activation of the adhesive system improves dentin tubule penetration and the bond strength of fiber posts to root dentin is unclear.
The purpose of this in vitro study was to evaluate the effect of ultrasonic activation of 2 adhesive systems (etch-and-rinse and self-etch) and 1 glass ionomer cement on the dentin tubule penetration and pushout bond strength of fiber posts to root dentin.
Sixty maxillary central incisors were endodontically treated and divided into 6 groups (n=10) as per the post cementation strategy: etch-and-rinse, etch-and-rinse and ultrasonic, self-etch, self-etch and ultrasonic, glass ionomer cement, and glass ionomer cement and ultrasonic. The primers, the adhesives, and the glass ionomer cement were activated for 20 seconds each, and the fiber posts were cemented with a resin cement. Dentin tubule penetration was evaluated by confocal laser scanning microscopy and the pushout bond strength measured at 3 post locations: cervical, middle, and apical. The failure patterns were also described after pushout testing.
Self-etch and ultrasonic showed higher dentin tubule penetration than the other cementation strategies (P<.05) and improved the bond strength values (P<.05), which were higher than etch-and-rinse and ultrasonic and glass ionomer cement and ultrasonic (P<.05). Adhesive failures at the cement and dentin interface were predominant in the etch-and-rinse, self-etch, and self-etch and ultrasonic groups.
Ultrasonic activation improved the dentin tubule penetration of a self-etch adhesive system. The bond strength of fiber posts cemented with a self-etch adhesive system and a resin cement was improved after ultrasonic activation.
超声激活黏结系统是否能改善牙本质小管的渗透和纤维桩与根管牙本质的粘结强度尚不清楚。
本体外研究的目的是评估 2 种黏结系统（酸蚀冲洗和自酸蚀）和 1 种玻璃离子水门汀经超声激活后对纤维桩与根管牙本质的牙本质小管渗透和推出粘结强度的影响。
60 颗上颌中切牙经根管治疗后，根据桩粘结策略分为 6 组（n=10）：酸蚀冲洗、酸蚀冲洗和超声、自酸蚀、自酸蚀和超声、玻璃离子水门汀和玻璃离子水门汀和超声。每种处理方法的底漆、黏结剂和玻璃离子水门汀均激活 20 秒，然后用树脂黏结剂粘结纤维桩。通过共聚焦激光扫描显微镜评估牙本质小管的渗透情况，在 3 个桩位（颈、中、根尖）测量推出粘结强度。推出试验后还描述了失效模式。
自酸蚀和超声处理显示出比其他粘结策略更高的牙本质小管渗透（P<.05），并提高了粘结强度值（P<.05），高于酸蚀冲洗和超声处理以及玻璃离子水门汀和超声处理（P<.05）。在酸蚀冲洗、自酸蚀和自酸蚀和超声处理组中，黏结剂和牙本质界面的黏结失败占主导地位。
超声激活提高了自酸蚀黏结系统的牙本质小管渗透。经超声激活后，用自酸蚀黏结系统和树脂黏结剂粘结纤维桩的粘结强度得到提高。
