Elnaghy Amr M
Department of Conservative Dentistry and Endodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
J Endod. 2014 Jul;40(7):953-7. doi: 10.1016/j.joen.2013.11.007. Epub 2013 Dec 17.
The purpose of this study was to evaluate the surface microhardness, compressive strength, bond strength, and morphologic microstructures of Biodentine (BD; Septodont, Saint Maur des Fossés, France) and white mineral trioxide aggregate (WMTA) after exposure to a range of acidic pH levels.
For each test, 4 groups of each material were exposed to pH values of 7.4, 6.4, 5.4, and 4.4, respectively, for 7 days. The surface hardness was determined using Vickers microhardness. The compressive strength and micro-push-out bond strength were determined using the universal testing machine at a crosshead speed of 0.5 mm/min. The morphologic microstructures of specimens were evaluated using scanning electron microscopy.
BD showed higher surface hardness, compressive strength, and bond strength to root dentin compared with WMTA after exposure to different pH values. A substantial change in the microstructure of BD and WMTA occurred after exposure to different pH values. WMTA appeared to be more sensitive to acidic pH environments than BD.
BD material seems more appropriate for use when exposed to an acidic environment compared with WMTA.
本研究的目的是评估在一系列酸性pH值环境下，生物陶瓷（BD；法国圣莫尔-德富塞Septodont公司）和白色三氧化矿物凝聚体（WMTA）的表面显微硬度、抗压强度、粘结强度和微观形态结构。
对于每项测试，每种材料的4组样本分别暴露于pH值为7.4、6.4、5.4和4.4的环境中7天。使用维氏显微硬度测定表面硬度。使用万能试验机以0.5毫米/分钟的横梁速度测定抗压强度和微推出粘结强度。使用扫描电子显微镜评估样本的微观形态结构。
在暴露于不同pH值后，与WMTA相比，BD对牙本质的表面硬度、抗压强度和粘结强度更高。在暴露于不同pH值后，BD和WMTA的微观结构发生了显著变化。WMTA似乎比BD对酸性pH环境更敏感。
与WMTA相比，BD材料在暴露于酸性环境时似乎更适合使用。
