de Sá Maria Aparecida Barbosa, Nunes Eduardo, Antunes Alberto Nogueira da Gama, Brito Júnior Manoel, Horta Martinho Campolina Rebello, Amaral Rodrigo Rodrigues, Cohen Stephen, Silveira Frank Ferreira
Department of Dentistry, Pontifical Catholic University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
Department Dentistry, Montes Claros, Minas Gerais, Brazil.
Restor Dent Endod. 2021 Oct 20;46(4):e53. doi: 10.5395/rde.2021.46.e53. eCollection 2021 Nov.
This study evaluates the bond strength and marginal adaptation of mineral trioxide aggregate (MTA) Repair HP and Biodentine used as apical plugs; MTA was used as reference material for comparison.
A total of 30 single-rooted teeth with standardized, artificially created open apices were randomly divided into 3 groups ( = 10 per group), according to the material used to form 6-mm-thick apical plugs: group 1 (MTA Repair HP); group 2 (Biodentine); and group 3 (white MTA). Subsequently, the specimens were transversely sectioned to obtain 2 (cervical and apical) 2.5-mm-thick slices per root. Epoxy resin replicas were observed under a scanning electron microscope to measure the gap size at the material/dentin interface (the largest and smaller gaps were recorded for each replica). The bond strength of the investigated materials to dentin was determined using the push-out test. The variable bond strengths and gap sizes were evaluated independently at the apical and cervical root dentin slices. Data were analyzed using descriptive and analytic statistics.
The comparison between the groups regarding the variables' bond strengths and gap sizes showed no statistical difference ( > 0.05) except for a single difference in the smallest gap at the cervical root dentin slice, which was higher in group 3 than in group 1 ( < 0.05).
The bond strength and marginal adaptation to root canal walls of MTA HP and Biodentine cement were comparable to white MTA.
本研究评估用作根尖充填材料的三氧化矿物凝聚体（MTA）Repair HP和BioDentine的粘结强度及边缘适应性；将MTA用作对照材料进行比较。
选取30颗单根牙，人工制备标准化开放根尖，根据用于形成6毫米厚根尖充填材料的不同随机分为3组（每组n = 10）：第1组（MTA Repair HP）；第2组（BioDentine）；第3组（白色MTA）。随后，将标本横向切片，每颗牙根获得2片（颈部和根尖部）2.5毫米厚的切片。在扫描电子显微镜下观察环氧树脂复制品，测量材料/牙本质界面处的间隙大小（记录每个复制品的最大和最小间隙）。采用推出试验测定所研究材料与牙本质的粘结强度。分别在根尖和颈部牙根牙本质切片上独立评估粘结强度和间隙大小的变化。数据采用描述性和分析性统计学方法进行分析。
除颈部牙根牙本质切片最小间隙存在单一差异外，各组间粘结强度和间隙大小变量的比较无统计学差异（P > 0.05），第3组该间隙大于第1组（P < 0.05）。
MTA HP和BioDentine粘结剂与根管壁的粘结强度及边缘适应性与白色MTA相当。
