【作者】 杨静；

【导师】 何克新；

【作者基本信息】 广西医科大学 ， 口腔临床医学， 2008， 硕士

【摘要】 目的探讨根管冠部预处理对弯曲根管工作长度(WL)的影响,了解根管弯曲度和弯曲部位是否为根管冠部预处理(CP)改变根管工作长度效果的影响因素,并且比较GG钻和镍钛器械手用ProTaper的Sx锉对弯曲根管进行根管冠部预处理对根管工作长度的影响是否相同。材料和方法将40颗磨牙73个根管按不同弯曲度(中度弯曲、重度弯曲)和弯曲部位(弯曲位于根中1/3、根尖1/3)随机均分为2组,磨牙(牙合)面及根管根尖分别磨出可重复获得的参照点。第1组为GG钻组,用1#～3#GG钻进行根管冠部预处理,第2组为镍钛器械手用ProTaper的Sx挫,根管用Sx挫进行根管冠部预处理,两组根管均测量并记录处理前、后根管工作长度。将资料分别进行配对设计t检验、成组设计t检验和多因素析因分析的统计分析。结果根管冠部预处理后,两组弯曲根管工作长度减小明显(P<0.05),减少均值分别为0.33mm(GG钻组),0.30mm(ProTaper组)。工作长度减小与弯曲部位无显著相关(P>0.05),而与根管的弯曲度显著相关(P<0.05)。GG钻和手用ProTaper的Sx锉进行根管冠部预处理对根管工作长度的影响在统计学上没有显著性差异(P>0.05)。结论根管冠部预处理会影响根管工作长度,根管越弯曲,工作长度减小越明显,用GG钻和ProTaper的Sx锉分别进行根管冠部预处理,对根管工作长度的影响没有显著性差异。更多还原

【Abstract】 Objective: To determine whether canal working length (WL) is altered as a result of coronal preflaring (CP), to assess the correlation between the degree of angulation and the position of root canal curvatures and their influence on the comparative results between the pre- and post-CP and to compare the effect on WL change between by using Gates Glidden drills (GG drills) and the Sx file of ProTaper to CP.Methods: The 73 curved canals of 40 extracted molars were sorted by the degree of the curvatures as moderate (from over 5 to 25 degrees) and severe (over 25 degrees) and by the position of curvatures as median (the location of the curvature on the one-three middle of canal) and apical (the location of the curvature on the one-three of tip). The canals were divided into two similar groups having the approximative degree and position of curvatures: group 1, GG drills and group 2, ProTaper. The reference cusp tip and root-end were flattened to produce reproducible measurements. Then, CP was performed with GG drills in Group 1 and Sx file of ProTaper in Group 2. Measured and recorded the WL of each canal pre- and post-CP. Statistical analysis was performed using the Paired-Samples T Test, Independent-Samples T Test and Univariate analysis, respectively.Results: The WL decreased after CP in two groups (P<0.05). The mean decrease in WL for group 1 was 0.33mm and for group 2 was 0.30mm. There was no correlation between the WL decreased and the position of the root curvature, but there was significant correlation between the WL decreased and the degree of the root curvature(P<0.05). There was no significant difference in the effect on WL between group 1 and group 2 (P>0.05) .Conclusions: WL of curved canals decrease after CP. The more degree of the root curvature is, the more WL decreased occurs. There was no significant difference in the effect on WL change between using GG drills and Sx file of ProTaper to CP.更多还原