Majeed Abdul, AlShwaimi Emad
Division of Endodontics, Restorative Dental Sciences Department, College of Dentistry, University of Dammam, Dammam, Saudi Arabia.
Med Princ Pract. 2017;26(2):139-145. doi: 10.1159/000453455. Epub 2016 Nov 15.
This was an in vitro evaluation of push-out bond strength and surface microhardness of calcium silicate-based biomaterials in coronal and apical root dentin.
Ninety sections (2 mm thick) of coronal and apical root dentin were obtained from roots of 60 extracted teeth; the canals were enlarged to a standardized cavity diameter of 1.3 mm. Sections were randomly divided into 6 groups (n = 15 per group), and cavities were filled with Biodentine™, BioAggregate, or ProRoot mineral trioxide aggregate (MTA), according to the manufacturers' instructions. Push-out bond strength values were measured using a universal testing machine under a compressive load at a speed of 1 mm/min. Samples were analyzed under a light microscope to determine the nature of bond failure. Ten samples (2 mm thick) were prepared for all the materials, and Vickers microhardness was determined using a digital hardness tester. Data were analyzed using one-way analysis of variance and Tukey-Kramer multiple comparison tests at a significance level of p < 0.05.
Biodentine (42.02; 39.35 MPa) and ProRoot MTA (21.86; 34.13 MPa) showed significantly higher bond strengths than BioAggregate (6.63; 10.09 MPa) in coronal and apical root dentin, respectively (p < 0.05). Biodentine also differed significantly from ProRoot MTA in coronal dentin. Bond failure was predominantly adhesive in Biodentine and ProRoot MTA, while BioAggregate showed predominantly mixed failure. ProRoot MTA (158.52 HV) showed significantly higher microhardness and BioAggregate (68.79 HV) showed the lowest hardness.
Biodentine and ProRoot MTA showed higher bond strength and microhardness compared to BioAggregate.
本研究旨在对硅酸钙基生物材料在冠部和根尖牙本质中的推出粘结强度和表面显微硬度进行体外评估。
从60颗拔除牙齿的牙根中获取90个冠部和根尖牙本质切片（2毫米厚）；将根管扩大至标准化的1.3毫米腔径。切片随机分为6组（每组n = 15），并根据制造商说明，用Biodentine™、BioAggregate或ProRoot矿物三氧化物凝聚体（MTA）填充窝洞。使用万能试验机以1毫米/分钟的速度在压缩载荷下测量推出粘结强度值。在光学显微镜下分析样本，以确定粘结失败的性质。为所有材料制备10个样本（2毫米厚），并使用数字硬度测试仪测定维氏显微硬度。使用单因素方差分析和Tukey-Kramer多重比较检验对数据进行分析，显著性水平为p < 0.05。
在冠部和根尖牙本质中，Biodentine（42.02；39.35兆帕）和ProRoot MTA（21.86；34.13兆帕）的粘结强度分别显著高于BioAggregate（6.63；10.09兆帕）（p < 0.05）。在冠部牙本质中，Biodentine与ProRoot MTA也有显著差异。Biodentine和ProRoot MTA的粘结失败主要为粘结性，而BioAggregate主要表现为混合性失败。ProRoot MTA（158.52 HV）的显微硬度显著更高，BioAggregate（68.79 HV）的硬度最低。
与BioAggregate相比，Biodentine和ProRoot MTA表现出更高的粘结强度和显微硬度。
