Zhou Hui-min, Shen Ya, Zheng Wei, Li Li, Zheng Yu-feng, Haapasalo Markus
Center for Biomedical Materials and Engineering, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin, China; Division of Endodontics, Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, British Columbia, Canada.
J Endod. 2013 Oct;39(10):1281-6. doi: 10.1016/j.joen.2013.06.012. Epub 2013 Aug 27.
The aim of this study was to evaluate the pH change, viscosity and other physical properties of 2 novel root canal sealers (MTA Fillapex and Endosequence BC) in comparison with 2 epoxy resin-based sealers (AH Plus and ThermaSeal), a silicone-based sealer (GuttaFlow), and a zinc oxide-eugenol-based sealer (Pulp Canal Sealer).
ISO 6876/2001 specifications were followed. The pH change of freshly mixed and set sealers was evaluated during periods of 1 day and 5 weeks, respectively. The viscosity was investigated at different injection rates (72, 10, and 5 mm/min) at room temperature by using a syringe-based system that was based on the Instron 3360 series universal testing system.
The flow, dimensional change, solubility, and film thickness of all the tested sealers were in agreement with ISO 6876/2001 recommendations. The MTA Fillapex sealer exhibited a higher flow than the Endosequence BC sealer (P < .05). The MTA Fillapex and Endosequence BC sealers showed the highest film thicknesses among the tested samples. The Endosequence BC sealer exhibited the highest value of solubility, which was in accordance with 3% mass fraction recommended by the ISO 6876/2001, and showed an acceptable dimensional change. The MTA Fillapex and Endosequence BC sealers presented an alkaline pH at all times. The pH of fresh samples of the AH Plus and ThermaSeal sealers was alkaline at first but decreased significantly after 24 hours. The viscosity of the tested sealers increased with the decreased injection rates.
The tested sealers were pseudoplastic according to their viscosities as determined in this study. The MTA Fillapex and Endosequence BC sealers each possessed comparable flow and dimensional stability but higher film thickness and solubility than the other sealers tested.
本研究旨在评估两种新型根管封闭剂（MTA Fillapex和Endosequence BC）与两种环氧树脂基封闭剂（AH Plus和ThermaSeal）、一种硅酮基封闭剂（GuttaFlow）以及一种氧化锌丁香酚基封闭剂（Pulp Canal Sealer）相比的pH值变化、粘度及其他物理性能。
遵循ISO 6876/2001规范。分别在1天和5周的时间段内评估新鲜混合及凝固后封闭剂的pH值变化。通过基于Instron 3360系列通用测试系统的注射器系统，在室温下以不同注射速率（72、10和5毫米/分钟）研究粘度。
所有测试封闭剂的流动性、尺寸变化、溶解度和膜厚度均符合ISO 6876/2001的建议。MTA Fillapex封闭剂的流动性高于Endosequence BC封闭剂（P <.05）。MTA Fillapex和Endosequence BC封闭剂在测试样品中显示出最高的膜厚度。Endosequence BC封闭剂的溶解度最高，符合ISO 6876/2001推荐的3%质量分数，且尺寸变化可接受。MTA Fillapex和Endosequence BC封闭剂在所有时间均呈现碱性pH值。AH Plus和ThermaSeal封闭剂新鲜样品的pH值起初呈碱性，但24小时后显著下降。测试封闭剂的粘度随注射速率降低而增加。
根据本研究测定的粘度，测试的封闭剂为假塑性。MTA Fillapex和Endosequence BC封闭剂各自具有相当的流动性和尺寸稳定性，但比其他测试封闭剂具有更高的膜厚度和溶解度。
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