Department of Restorative Dentistry, Dental School, Univ. Estadual Paulista, Araraquara, SP, Brazil.
Department of Conservative Dentistry, Dental School, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
J Appl Oral Sci. 2014 Apr;22(2):125-30. doi: 10.1590/1678-775720130052.
Due to the low radiopacity of Sealer 26, iodoform is frequently empirically added to this sealer. Thus, the interference of this procedure with the physicochemical properties of Sealer 26 must be evaluated.
This study evaluated the influence of the addition of iodoform on setting time, flow, solubility, pH, and calcium release of an epoxy-based sealer.
The control group was pure Sealer 26, and the experimental groups were Sealer 26 added with 1.1 g, 0.55 g or 0.275 g of iodoform. Setting time evaluation was performed in accordance with the ASTM C266-03 speciflcation. The analysis of flow and solubility was in accordance with the ISO 6876-2001 speciflcation. For the evaluation of pH and calcium ion release, polyethylene tubes were filled with the materials and immersed in flasks with 10 ml of deionized water. After 24 h, 7, 14, 21, 28, and 45 days pH was measured. In 45 days, the calcium released was evaluated with an atomic absorption spectrophotometer.
The addition of iodoform increased setting time in comparison with pure sealer (P<0.05). As for flow, solubility, and calcium release, the mixtures presented results similar to pure sealer (p>0.05). In the 24 h period, the mixture with 1.1 g and 0.55 g of iodoform showed lower pH than pure sealer and than sealer added with 0.275 g of iodoform (P<0.05).
The iodoform added to Sealer 26 interferes with its setting time and solubility properties. Further studies are needed to address the clinical signiflcance of this interference.
本研究评估了向一种基于环氧树脂的封闭剂中添加碘仿对其凝固时间、流动性、溶解性、pH 值和钙离子释放的影响。
对照组为纯 Sealer 26，实验组为添加 1.1 g、0.55 g 或 0.275 g 碘仿的 Sealer 26。凝固时间评估按照 ASTM C266-03 规范进行。流动性和溶解性分析按照 ISO 6876-2001 规范进行。为评估 pH 值和钙离子释放，将聚乙烯管填充材料并浸入盛有 10 ml 去离子水的烧瓶中。24 h、7、14、21、28 和 45 天后测量 pH 值。在第 45 天，用原子吸收分光光度计评估释放的钙离子。
与纯封闭剂相比，添加碘仿增加了凝固时间（P<0.05）。对于流动性、溶解性和钙离子释放，混合物的结果与纯封闭剂相似（p>0.05）。在 24 h 时，添加 1.1 g 和 0.55 g 碘仿的混合物的 pH 值低于纯封闭剂和添加 0.275 g 碘仿的混合物（P<0.05）。
向 Sealer 26 添加碘仿会干扰其凝固时间和溶解性。需要进一步研究以解决这种干扰的临床意义。
