Huang T H, Kao C T
Dental Department, Chung Shan Medical and Dental College, Taiwan, Republic of China.
J Endod. 1998 Apr;24(4):236-8. doi: 10.1016/S0099-2399(98)80103-9.
The purpose of this study was to compare the surface pH level of three different type sealers after mixing at various time intervals in vitro. The cements were mixed according to the manufacturer's instructions. They were incubated to set in 100% humidity at 37 degrees C for 1 h, 24 h, 5 days, 8 days, 2 wk, 3 wk, 4 wk, 5 wk, and 7 wk. pH was calculated by a Twin pH meter. The pH levels of the three sealers were different at various time intervals (p < 0.0001). The resin-based cement had a acid pH level (pH < 7.0). The calcium hydroxide-based cement showed a higher alkalinity pH level (pH > 7.0). The zinc oxide-eugenol-based cement showed a similar pH level to the calcium hydroxide cement at the end of the measurement. We postulated that, in endodontic therapy when those healing is needed, the alkaline-based sealer is the choice.
本研究的目的是在体外比较三种不同类型封闭剂在不同时间间隔混合后的表面pH值水平。这些水门汀按照制造商的说明进行混合。将它们在37℃、100%湿度下孵育凝固1小时、24小时、5天、8天、2周、3周、4周、5周和7周。通过双pH计计算pH值。三种封闭剂在不同时间间隔的pH值水平不同（p<0.0001）。树脂基水门汀的pH值呈酸性（pH<7.0）。氢氧化钙基水门汀显示出较高的碱性pH值水平（pH>7.0）。在测量结束时，氧化锌-丁香酚基水门汀显示出与氢氧化钙水门汀相似的pH值水平。我们推测，在需要愈合的牙髓治疗中，碱性封闭剂是首选。
