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Abstract：
This study evaluated the setting time, pH, calcium ion release, solubility, and chemical structure of four calcium silicate sealers after ultrasonic activation (UA). Five sealers were evaluated: Sealer Plus (SP - control); Sealer Plus BC (SPBC), Bio C Sealers (BCS), Endosequence BC Sealer (EBC), and BioRoot RCS (BR). Ten groups were created based on the use or not of ultrasonic activation: SP; SP/UA; SPBC; SPBC/UA; BCS; BCS/UA; EBC; EBC/UA; BR; and BR/UA. Setting time was performed based on ISO 6876:2012 and ASTM C266-07 specifications. Solubility at 24hs, based on ISO 6876:2012. pH and calcium release were evaluated at 1, 24, 72, and 168hs. Raman spectroscopy was used to evaluate structural changes. Quantitative data were analyzed using One-Way ANOVA and Tukey post-hoc test (α=5%). Raman spectroscopy results were qualitatively analyzed. Setting times and solubility of all sealers were not affected by UA (p>0.05). The highest solubility was found for BCS, BCS/UA; and BR, BR/UA (p<0.05). After 24hs, calcium silicate sealers had higher pH than SP and SP/UA (p<0.05). BR and BR/UA had the highest pH at all time points. SP and SP/UA had stable pH at all time points. SP and SP/UA had the lowest calcium release values at all time points (p<0.05). EBC and EBC/UA calcium release significantly differ at 24,72 and 168hs (p<0.05). No chemical changes were observed during Raman spectroscopy. In conclusion, ultrasonic activation affected calcium ion release only for EndoSequence BC Sealer. Ultrasonic activation did not influence the initial and final setting time, solubility, pH, and chemical structure of any investigated sealers.
摘要：
这项研究评估了凝固时间，pH值,钙离子释放，溶解度，超声活化（UA）后的四种硅酸钙密封剂的化学结构。评价了五种密封剂:密封剂加(SP-对照);密封剂加BC(SPBC),BioC密封剂(BCS),EndsequenceBCSealer(EBC),和生物根RCS（BR）。根据是否使用超声激活创建了10组：SP;SP/UA;SPBC;SPBC/UA;BCS;BCS/UA;EBC;EBC/UA;BR;和BR/UA。凝固时间基于ISO6876:2012和ASTMC266-07规范进行。溶解度在24hs，基于ISO6876:2012。在1、24、72和168hs下评估pH和钙释放。拉曼光谱用于评估结构变化。使用单向ANOVA和Tukey事后检验分析定量数据(α=5%)。对拉曼光谱结果进行定性分析。所有密封剂的凝固时间和溶解度均不受UA影响(p>0.05)。发现BCS的溶解度最高，BCS/UA;和BR,BR/UA(p<0.05)。24hs之后，硅酸钙密封剂的pH值高于SP和SP/UA（p<0.05）。BR和BR/UA在所有时间点具有最高的pH。SP和SP/UA在所有时间点都具有稳定的pH。SP和SP/UA在所有时间点具有最低的钙释放值(p<0.05)。EBC和EBC/UA钙释放在24、72和168hs处显著不同(p<0.05)。在拉曼光谱中没有观察到化学变化。总之,超声激活仅影响EndoSequenceBC密封剂的钙离子释放。超声波激活不影响初始和最终凝固时间，溶解度，pH值,和化学结构的任何研究的密封剂。
