Antunes Bortoluzzi Eduardo, Juárez Broon Norberto, Antonio Hungaro Duarte Marco, de Oliveira Demarchi Ana Claudia Cardoso, Monteiro Bramante Clovis
Department of Endodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil.
J Endod. 2006 Dec;32(12):1194-7. doi: 10.1016/j.joen.2006.07.018. Epub 2006 Oct 13.
The aim of this study was to evaluate the influence of adding 10% calcium chloride (CaCl2) indicated as setting accelerator on pH and release of calcium ions of commercially available materials: ProRoot MTA (tooth-colored formula), MTA Branco, and White Portland cement. The products were mixed for 30 seconds in previously established ratios. To estimate the values of pH and release of calcium ion, polyethylene tubes were filled with the materials and immersed in containers with 10 ml of deionized water. The analyses were performed baseline, 30 minutes, 60 minutes, and 24 hours after the mixing process. A pHmeter (MicroNal B 371, Sao Paulo, SP, Brazil) and an atomic absorption spectrophotometer (Model GBC 904; CG Corp, Melbourne, Australia) equipped with a hollow cathode lamp were used to determine the data. According to the Student's t-test, the comparison between the pure and the CaCl2-added products indicated that the presence of this substance increased immediately the pH, although the results were very similar when they were analyzed in the other intervals. In addition, products with CaCl2 released more calcium ions than pure materials in the 24-hour period (p<0.05). The results revealed that the addition of CaCl2 to MTA enhanced the physicochemical properties of this product. Thus, materials mixed with CaCl2 became easier to handle and needed lower amounts of water in the mixing process.
本研究的目的是评估添加10%氯化钙（CaCl₂）作为促凝剂对市售材料ProRoot MTA（牙色配方）、MTA Branco和白色波特兰水泥的pH值及钙离子释放的影响。将产品按先前确定的比例混合30秒。为了估计pH值和钙离子释放量，将聚乙烯管装满材料并浸入装有10毫升去离子水的容器中。在混合过程后的基线、30分钟、60分钟和24小时进行分析。使用pH计（MicroNal B 371，巴西圣保罗）和配备空心阴极灯的原子吸收分光光度计（型号GBC 904；澳大利亚墨尔本CG Corp）来确定数据。根据学生t检验，纯产品与添加CaCl₂的产品之间的比较表明，该物质的存在会立即提高pH值，尽管在其他时间段分析时结果非常相似。此外，在24小时内，添加CaCl₂的产品比纯材料释放更多的钙离子（p<0.05）。结果表明，向MTA中添加CaCl₂可增强该产品的物理化学性质。因此，与CaCl₂混合的材料在混合过程中变得更易于操作，并且所需水量更少。
