Centenaro Carolina Fabiana, Santini Manuela Favarin, da Rosa Ricardo Abreu, Nascimento Angela Longo do, Kuga Milton Carlos, Pereira Jefferson Ricardo, Só Marcus Vinícius Reis
Conservative Dentistry Departament, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
Department of Restorative Dentistry, Araraquara Dental School, São Paulo State University, Araraquara, São Paulo, Brazil.
Scanning. 2016 May;38(3):240-4. doi: 10.1002/sca.21266. Epub 2015 Sep 1.
The aim of this study was to assess the effect of calcium hydroxide on bond strength of two bioactive cements. One-mm thick longitudinal slabs of root dentin were obtained from freshly extracted human monorradicular teeth (n = 60). Simulated root perforations (1 mm in diameter) were prepared in radicular dentin. Thereafter, the specimens were randomly divided into two groups (n = 30), according to the repair material: MTA (n = 30) and Biodentine (BD) (n = 30). Next, the specimens in each group were further randomly divided into 4 equal subgroups (n = 15) according to the prior use of Ca(OH)2: MTA/Ca(OH)2 and BD/Ca(OH)2 groups: perforations were filled with calcium hydroxide [Ca(OH)2] and after 7 days, it was removed, and MTA and BD groups: calcium hydroxide dressing were not used. Push-out test was performed at a crosshead speed of 1 mm/min. Bond strength values were compared statistically using Kruskal-Wallis test and Dunn's post-test at a significance level of 5%. The failure analysis was performed using a stereoscopic and classified as adhesive, cohesive and mixed. The push-out bond strength of MTA and BD was not affected by the prior use of Ca(OH)2 (p > 0.05). BD yielded higher push-out bond strength values compared with those of MTA, regardless of the use of Ca(OH)2 (p < 0.05). Mixed failures were predominant in all groups. Ca(OH)2 placement for perforations sealing does not alter the bond strength of MTA and BD to the root dentin. BD presented higher bond strength values than MTA. SCANNING 38:240-244, 2016. © 2015 Wiley Periodicals, Inc.
本研究的目的是评估氢氧化钙对两种生物活性水门汀粘结强度的影响。从新鲜拔除的人单根牙（n = 60）获取1毫米厚的根牙本质纵向切片。在根牙本质中制备模拟根穿孔（直径1毫米）。此后，根据修复材料将标本随机分为两组（n = 30）：MTA组（n = 30）和生物活性玻璃离子水门汀（BD）组（n = 30）。接下来，根据是否预先使用Ca(OH)₂，将每组标本进一步随机分为4个相等的亚组（n = 15）：MTA/Ca(OH)₂组和BD/Ca(OH)₂组：穿孔用氢氧化钙[Ca(OH)₂]填充，7天后取出，以及MTA组和BD组：未使用氢氧化钙敷料。以1毫米/分钟的十字头速度进行推出试验。使用Kruskal-Wallis检验和Dunn事后检验在5%的显著性水平下对粘结强度值进行统计学比较。使用立体显微镜进行失效分析并分类为粘结性、内聚性和混合性。MTA和BD的推出粘结强度不受预先使用Ca(OH)₂的影响（p > 0.05）。无论是否使用Ca(OH)₂，BD产生的推出粘结强度值均高于MTA（p < 0.05）。所有组中混合失效占主导。用于穿孔封闭的Ca(OH)₂放置不会改变MTA和BD与根牙本质的粘结强度。BD的粘结强度值高于MTA。《扫描》38:240 - 244，2016。© 2015威利期刊公司
