Department of Restorative Dentistry, Araraquara Dental School, UNESP, University Estadual Paulista, Araraquara, São Paulo, Brazil.
J Endod. 2011 Jun;37(6):844-6. doi: 10.1016/j.joen.2011.02.033. Epub 2011 Apr 13.
An experimental mineral trioxide aggregate sealer (MTAS) has been developed for use as a root canal sealer. The aim of this study was to evaluate the setting time, pH, and calcium ion release of MTAS compared with white Portland cement (CPB-40; Votorantin Cimentos, Camargo Correa SA, Pedro Leopoldo, MG, Brazil), white MTA Angelus (MTA; Angelus, Londrina, PR, Brazil), and AH Plus (Dentsply DeTrey, Konstanz, Germany).
For the evaluation of setting time, each material was analyzed using Gilmore-type needles. Polyethylene tubes with the materials were immersed in distilled water for the measurement of pH (digital pH meter) and calcium release (atomic absorption spectrophotometry). The evaluations were performed at 3, 6, 12, 24, and 48 hours and 7, 14, and 28 days. Data were analyzed by analysis of variance and the Tukey test at 5% significance level.
MTAS showed higher calcium release at all experimental periods, a greater increase in pH up to 48 hours and the longest setting time.
MTAS presented favorable properties for its indication as a root canal sealer.
一种实验性的矿化三氧化物聚合体密封剂（MTAS）已被开发用于根管封闭剂。本研究旨在评估 MTAS 与白波特兰水泥（CPB-40；Votorantin Cimentos，Camargo Correa SA，Pedro Leopoldo，MG，巴西）、白色 MTA 牙胶（MTA；Angelus，Londrina，PR，巴西）和 AH Plus（Dentsply DeTrey，Konstanz，德国）的凝固时间、pH 值和钙离子释放情况。
为了评估凝固时间，使用吉尔莫尔型针头对每种材料进行分析。将装有材料的聚乙烯管浸入蒸馏水中，以测量 pH 值（数字 pH 计）和钙离子释放量（原子吸收分光光度法）。在 3、6、12、24 和 48 小时以及 7、14 和 28 天时进行评估。数据通过方差分析和 Tukey 检验在 5%的显著水平下进行分析。
MTAS 在所有实验期都表现出更高的钙离子释放量，在 48 小时内 pH 值有更大的增加，凝固时间最长。
MTAS 具有作为根管封闭剂的应用潜力。
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