Al-Haddad Afaf Y, Kutty Muralithran G, Abu Kasim Noor Hayaty, Che Ab Aziz Zeti Adura
Department of Dental Materials and Equipment, Faculty of Dentistry, Mahsa University, 42610 Selangor, Malaysia.
Department of Restorative Dentistry, Faculty of Dentistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.
J Dent Sci. 2017 Dec;12(4):340-346. doi: 10.1016/j.jds.2017.03.008. Epub 2017 Apr 24.
BACKGROUND/PURPOSE: Intraradicular moisture is not standardized and alters the sealing properties and adhesion of root sealers. The aim of this work was to evaluate the effect of different moisture on the constitution of bioceramic sealers.
The sealers were evaluated before mixing, and after setting using X-ray diffraction (XRD), Energy Dispersive Analysis (EDX) and Scanning Electron Microscope (SEM) techniques. Twenty four extracted teeth were prepared and assigned to four groups according to the moisture conditions: (1) dry: using ethanol as final irrigation, (2) normal: using paper points until the last one appeared dry, (3) moist: using a Luer adapter for 5 s followed by 1 paper point, and (4) wet: the canals remained totally flooded. The roots were filled with MTA Fillapex and Endosequence BC and kept in phosphate buffer solution at 37 °C for 10 days. Each root was sectioned transversally and longitudinally. The sealers harvested from longitudinal sections were analysed using XRD. Whilst the transverse sections were analysed using SEM/EDX.
The XRD analysis showed MTA Fillapex composed of Bismuth trioxide, calcium silicate and tricalcium aluminate. The intensity of peaks in the wet condition was reduced. Endosequence BC contained mainly calcium silicate, calcium silicate hydrate, zirconia and calcium hydroxide. The wet condition showed a small increase in hydrated calcium silicate. The EDX analysis showed changes in the elemental concentrations with different moisture conditions. The surface morphology differed with different moisture conditions.
Tested sealers have different constitution that not affected by the degree of moisture. However, it changed their relative quantity.
背景/目的：根管内湿度未标准化，会改变根管封闭剂的密封性能和黏附性。本研究旨在评估不同湿度对生物陶瓷根管封闭剂组成的影响。
在混合前和凝固后，使用X射线衍射（XRD）、能量色散分析（EDX）和扫描电子显微镜（SEM）技术对封闭剂进行评估。准备24颗拔除的牙齿，并根据湿度条件分为四组：（1）干燥：使用乙醇作为最终冲洗液；（2）正常：使用纸尖直至最后一个纸尖变干；（3）潮湿：使用鲁尔接头5秒，然后使用1个纸尖；（4）湿润：根管保持完全充满液体。用MTA Fillapex和Endosequence BC填充根管，并在37℃的磷酸盐缓冲溶液中保存10天。将每颗牙根进行横向和纵向切片。从纵向切片中获取的封闭剂使用XRD进行分析。而横向切片则使用SEM/EDX进行分析。
XRD分析表明，MTA Fillapex由三氧化二铋、硅酸钙和铝酸三钙组成。湿润条件下峰的强度降低。Endosequence BC主要包含硅酸钙、水合硅酸钙、氧化锆和氢氧化钙。湿润条件下显示水合硅酸钙略有增加。EDX分析表明，不同湿度条件下元素浓度发生变化。表面形态因不同湿度条件而有所不同。
所测试的封闭剂具有不同的组成，不受湿度程度的影响。然而，湿度改变了它们的相对含量。
