School of Dentistry, Faculty of Health Sciences, Jorge Basadre Grohmann National University, Tacna, Perú.
Department of Restorative Dentistry, School of Dentistry, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil.
Microsc Res Tech. 2022 Jun;85(6):2131-2139. doi: 10.1002/jemt.24071. Epub 2022 Feb 10.
The aim of this study was to evaluate the effects of cleaning protocols on the presence of residues, open dentinal tubules, and bond strength of a self-etch adhesive plus a dual-cure resin cement to dentin in the fiber-post space. The methods for cleaning utilized were conventional irrigation (CI), rotary brush with continuous rotary movement (RB), and continuous ultrasonic irrigation (CUI). Sixty bovine incisors were used for fiber-post space preparation. Thirty roots were divided into three groups (n = 10) according to the cleaning protocols and submitted to scanning electron microscope to evaluate presence of residues and relative quantity of open dentinal tubules on dentin surface. Similar protocols were performed in the other thirty roots (n = 10) using a self-etching adhesive system (Scotchbond Universal) and a dual-cure resin cement (Relyx Unicem 2). After 6 months cervical, middle, and apical thirds sections of fiber-post space were submitted to push-out testing. To data ANOVA and Tukey's test were employed (α = 5%). RB and CUI showed the lowest presence of residues on dentin surface (p = .015) and the highest bond strength values (p < .001), regardless of the dentin third. CUI presented the highest quantity of open dentinal tubules in middle and apical thirds (p < .001). CI presented the lowest bond strength value of resin cement, regardless of dentin third (p < .001). Mechanical cleaning protocols, such as RB and CUI, presented better surface cleaning capabilities and higher bond strength than CI with dual-cure resin cement employed. The use of a mechanical cleaning protocol seems to cause appropriate condition on the root dentin surface. Mechanical cleaning of root dentin provided greater bond strength of the self-etching system with dual resin cement. Conventional irrigation did not provide adequate root dentin cleaning. RESEARCH HIGHLIGHTS: • The use of a mechanical cleaning protocol seems to cause appropriate condition on the root dentin surface. • Mechanical cleaning of root dentin provided greater bond strength of the self-etching system with dual resin cement. • Conventional irrigation did not provide adequate root dentin cleaning.
本研究旨在评估不同清洁方案对纤维桩空间内自酸蚀黏结剂和双重固化树脂水门汀与牙本质间残留、开放牙本质小管和黏结强度的影响。所采用的清洁方法包括常规冲洗（CI）、连续旋转刷洗（RB）和连续超声冲洗（CUI）。60 颗牛切牙用于纤维桩空间预备。30 根根根据清洁方案分为三组（n=10），并通过扫描电子显微镜评估牙本质表面残留和开放牙本质小管的相对数量。在另外 30 根根（n=10）中采用自酸蚀黏结系统（Scotchbond Universal）和双重固化树脂水门汀（Relyx Unicem 2）进行类似的方案。6 个月后，将纤维桩空间的颈、中、根尖三部分进行推出试验。数据分析采用方差分析和 Tukey 检验（α=5%）。RB 和 CUI 显示在牙本质表面残留最少（p=0.015），黏结强度最高（p<0.001），与牙本质的第三部分无关。CUI 在中、根尖部显示出最多的开放牙本质小管（p<0.001）。CI 无论在牙本质的哪一部分，树脂水门汀的黏结强度最低（p<0.001）。机械清洁方案，如 RB 和 CUI，与使用双重固化树脂水门汀的 CI 相比，具有更好的表面清洁能力和更高的黏结强度。机械清洁牙根表面似乎为牙本质表面提供了适当的条件。机械清洁牙根提供了自酸蚀系统与双重树脂水门汀更强的黏结强度。常规冲洗不能提供充分的牙根清洁。研究亮点：• 机械清洁方案似乎为牙本质表面提供了适当的条件。• 机械清洁牙根提供了自酸蚀系统与双重树脂水门汀更强的黏结强度。• 常规冲洗不能提供充分的牙根清洁。
