profile of canal

Material and Methods: Thirty single-rooted premolars were randomly divided into three groups. For the 10 teeth of each group, we used the Profile rotatory device to prepare the root canal and remove its smear layer with 15% EDTA.

材料与方法：离体单根管前磨牙30颗随机分为3组，每组10颗牙采用机用Profile预备根管并去除涂层，分别采用手用充填器充填氢氧化钙糊剂；

Optimizing Profile cross Section of Lined Water Conveyance canal

衬砌配水渠道最优纵横断面优化设计

Objective: To compare the cleanliness of the single root canal premolar walls prepared by stainless steel K file and profile rotatory device.

目的：比较手用不锈钢K型锉根管预备方法和机用镍钛Profile根管预备方法对单根管前磨牙根管清洁能力的差异。

Conclusion: Compared file of stainless steel with traditional hand, ProFile flexible nickel titanium file had obvious advantages in root canal treatment.

结论：与传统手用不锈钢锉相比，ProFile机动镍钛锉在根管预备方面有明显的优势。

A nonlinear programming model for optimizing profile cross section of lined water conveyance canal is presented in this paper.

采用非线性模型，推荐田间混凝土衬砌渠道纵横断面的优化设计方法，且可节省大量投资。