Yamauchi Shinya, Watanabe Satoshi, Okiji Takashi
Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University.
J Oral Sci. 2020 Dec 23;63(1):65-69. doi: 10.2334/josnusd.20-0325. Epub 2020 Dec 10.
The purpose of this study was to examine the effect of heating on the physical properties of four types of premixed calcium silicate-based root canal sealers. Endoseal MTA, Well-Root ST, EndoSequence BC Sealer, EndoSequence BC Sealer HiFlow, and AH Plus (epoxy resin root canal sealer) were heated at 100°C for 1 min, and changes in setting time, flow, and film thickness were evaluated in accordance with ISO 6876:2012 standards. In addition, pH measurement and scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) analyses of the set materials were performed. All root canal sealers heated at 100°C showed significant decreases in setting time and flow, particularly Endoseal MTA. In addition, the film thickness of Endoseal MTA increased significantly after heating at 100°C. The pH and SEM/EDS results were not affected by heating. Heating calcium silicate-based root canal sealers accelerated setting time, decreased flow, and increased film thickness. However, the degree of these changes varied among the products. The present findings indicate that heat-induced changes in the physical properties of calcium silicate-based root canal sealers could adversely affect the quality of warm vertical condensation technique.
本研究的目的是考察加热对四种预混硅酸钙类根管封闭剂物理性能的影响。将Endoseal MTA、Well-Root ST、EndoSequence BC Sealer、EndoSequence BC Sealer HiFlow和AH Plus（环氧树脂类根管封闭剂）在100°C下加热1分钟，并根据ISO 6876:2012标准评估凝固时间、流动性和薄膜厚度的变化。此外，对凝固后的材料进行了pH测量、扫描电子显微镜（SEM）和能量色散X射线光谱（EDS）分析。所有在100°C下加热的根管封闭剂凝固时间和流动性均显著降低，尤其是Endoseal MTA。此外，Endoseal MTA在100°C加热后薄膜厚度显著增加。pH以及SEM/EDS结果不受加热影响。加热硅酸钙类根管封闭剂会加快凝固时间、降低流动性并增加薄膜厚度。然而，这些变化的程度因产品而异。目前的研究结果表明，加热引起的硅酸钙类根管封闭剂物理性能变化可能会对热垂直加压技术的质量产生不利影响。
