4种机用镍钛器械在模拟弯曲根管内成形能力的实验研究

 目的    比较4种不同机用镍钛器械预备树脂模拟弯曲根管的成形能力，为临床应用提供实验依据。方法    将40个单弯树脂模拟根管随机分为4组，每组10个，分别为ProTaper Universal组、iRaCe组、Reciproc Blue组和HyFlex EDM组，采用4种不同机用镍钛器械进行根管预备，并记录各组预备时间。使用单反相机采集各组预备前后根管的形态照片，采用Adobe Photoshop CS5软件进行图像重叠，使用Image Pro Plus6.0软件测量10个观测点的根管内、外侧壁树脂去除量并计算器械的中心定位能力，采用SPSS 17.0软件对数据进行统计学分析。结果    iRaCe组预备时间最短，预备效率最高（P < 0.05）。在根尖区，iRaCe组的中心定位能力最好；在弯曲点附近，iRaCe组和HyFlex EDM组的中心定位能力较好，相对优于ProTaper Universal组和Reciproc Blue组；在弯曲点冠方，iRaCe组、Reciproc Blue组、HyFlex EDM组的中心定位能力均显著优于ProTaper Universal组（P < 0.05）。结论　4种机用镍钛器械均可较好地保持原始根管的走向，无明显的偏移及台阶等出现。与ProTaper Universal相比，iRaCe、Reciproc Blue和HyFlex EDM镍钛器械对弯曲根管表现出更加出色的成形能力，更适合用于弯曲根管的预备。

Short-term effect of triamcinolone acetonide gargle in the treatment of recurrent oral ulcer

Objective To study the short-term effect of triamcinolone acetonide gargle in the treatment of recurrent oral ulcer. Methods A total of 120 patients with recurrent aphthous ulcer were divided into two groups randomly. The test group was treated with triamcinolone acetonide gargle;the control group was treated with Koutai gargle . Then the therapeutic effect was evaluated according to the test results. Results The difference of the ulcer duration and pain index between the test group and the control was statistically significant. Conclusion The Short-term effect of triamcinolone acetonide gargle in the treatment of recurrent oral ulcer is better than that of Koutai gargle，so triamcinolone acetonide gargle can be used as an effective drug to treat RAU.