Santos A D, Moraes J C S, Araújo E B, Yukimitu K, Valério Filho W V
Departamentos de Física e Química, UNESP Campus de Olha Solteira, Sao Paulo, Brazil.
Int Endod J. 2005 Jul;38(7):443-7. doi: 10.1111/j.1365-2591.2005.00963.x.
To evaluate the release of calcium ions, pH and conductivity of a new experimental dental cement (EC) and to compare them with those of mineral trioxide aggregate (MTA-Angelus).
Five samples of each cement were prepared using plastic tubes 1 mm in diameter and 10 mm long. Each sample was sealed in a test tube containing 10 mL deionized water which was analysed after 24, 48, 72, 96, 192, 240 and 360 h for pH, electrical conductivity and calcium release. The concentration of calcium ions was obtained through atomic absorption spectroscopy technique. The data were analysed statistically using the analysis of variance (anova) and the Student's test (t-test).
The pH of the storage solutions was not affected by the material and the interaction of material with time (P > 0.05). However, the time of immersion was significant (P < 0.01) for both materials. For the electric conductivity and calcium release, the interaction of material with time was statistically significant (P < 0.01), indicating that EC and MTA-Angelus did not behave in a similar manner.
The experimental cement released calcium and increased the pH of the storage solutions in a similar manner to MTA-Angelus. However, EC showed significantly higher calcium release than commercial MTA-Angelus after 24 h.
评估一种新型实验性牙科水门汀（EC）的钙离子释放、pH值和电导率，并将其与三氧化矿物凝聚体（MTA - Angelus）进行比较。
使用直径1毫米、长10毫米的塑料管制备每种水门汀的五个样本。每个样本密封在装有10毫升去离子水的试管中，在24、48、72、96、192、240和360小时后对去离子水进行pH值、电导率和钙释放分析。通过原子吸收光谱技术获得钙离子浓度。使用方差分析（anova）和学生检验（t检验）对数据进行统计学分析。
储存溶液的pH值不受材料以及材料与时间相互作用的影响（P>0.05）。然而，两种材料的浸泡时间均具有显著性（P<0.01）。对于电导率和钙释放，材料与时间的相互作用具有统计学显著性（P<0.01），表明EC和MTA - Angelus的表现方式不同。
实验性水门汀释放钙并使储存溶液的pH值升高，其方式与MTA - Angelus相似。然而，24小时后，EC的钙释放量显著高于市售MTA - Angelus。
