手用ProTaper器械预备弯曲根管的研究  

Evaluation of preparation of curved root canals using hand-used ProTaper

作　　者：聂敏[1] 赵心臣[1] 彭彬[2] 樊明文[2] 边专[2] 

机构地区：[1]武汉大学口腔医学院口腔生物医学工程教育部重点实验室,430079 [2]武汉大学口腔医学院牙体牙髓科

出　　处：《中华口腔医学杂志》2009年第5期262-265,共4页Chinese Journal of Stomatology

摘　　要：目的使用牙髓立体模型（Endodontic Cube）评价手用ProTaper预备不同弯曲根管的能力。方法按纳入标准筛选离体牙样本，根据根管弯曲度（α）将根管分3组，A组0°≤α〈25°，B组25°≤α〈40°，C组40°≤α〈55°，每组18个根管。灌制Endodontic Cube模型，用低速锯将样本分为根管上、中、下段，组装模型，手用ProTaper预备根管，体视显微镜获取预备前、后根管的断面形态。统计学分析预备前后各段根管截面积之差△S、面积比、根管偏移距离X1、中心比CR值。结果①B、C组的牙本质切削量和预备前后根管截面积差比较大[B组根中部△S为（0．46±0．25）mm^2，C组根中部△S为（0．48±0．30）mm^2]，显著大于A组[A组根中部△S为（0．28±0．13）mm^2，P〈0．05]；②C组的根管偏移距离最大，在根尖部[（0．23±0．10）inm]、根中部[（0．36±0．16）mm]及根上部[（0．31±0．15）mm]均显著大于A组[根尖部（0．19±0．07）mm、根中部（0．20±O．08）mm、根上部（0．18±0．08）mm，与C组相比P〈0．05]，在根管中段的偏移距离显著大于B组[（0．28±0．11）mm，P〈0．05]；③C组根管中部的维持能力显著差于A、B组（P〈0．01）。结论随着根管弯曲度的增加，手用ProTaper对牙本质的切削量增加，定位中心的能力降低。Objective To evaluate the shaping ability of hand-used ProTaper on curved canals using Endodontic Cube. Methods Fifty-four curved root canals in vitro were selected and divided into three groups according to the curved degree （α）, group A： 0°〈 α 〈 25°, group B： 25°〈 α〈 40°, group C： 40°〈 α 〈 55 °. Endodontic Cube was assembled, and each sample was sectioned perpendicular to the axis of the tooth into four sections with Isomet-Buhler in low speed. Then the root canals were prepared with hand-used ProTaper. Before and after shaping, photograph of all the sections were taken under a stereomicroscope. Statistical analyses were performed. Results The dentin cutting quantity of the whole canal prepared with ProTaper in group B and C was larger than that of group A. The deviation distance of the whole canal prepared by ProTaper in group C was significantly larger than that in group A, and the deviation distance in middle portion larger than that in group B. The maintaining ability in the middle portion of group C by ProTaper was worse than that of group A and B. Conclusions The curvature of root canal may increase the cutting quantity of the dentin and reduce the ability of remaining original canal shape prepared by ProTaper.

关 键 词：根管制备 牙科高速设备 牙髓腔 

分 类 号：R686[医药卫生—骨科学]