根管预备技术对根管充填效果研究.docVIP

根管预备技术对根管充填效果研究 　　摘要：目的通过比较逐步后退与逐步深入法两种不同预备方法预备根管后的牙胶充填面积百分数来评价两种预备方法的效果。方法选取人离体单根管前磨牙20颗（正畸治疗拔除的牙齿），分别手用K锉严格按着逐步后退法预备根管。机用镍钛器械Mtwo严格按着逐步深入法预备根管。预备后随机分为两组，分别用冷牙胶侧方充填法、热牙胶充填法，然后分别在距根尖3、7、10 mm处截断，计算出牙胶充填面积百分数，以评价何种预备方法效果最佳。结果在根尖3 mm处，两种预备充填法的牙胶充填面积百分数无显著性差异（P＞0.05）；而在根尖7 mm、10 mm处，逐步后退与逐步深入法有显著性差异(p＜0.05)。结论在根尖7 mm、10 mm水平，逐步深入法效果明显好于逐步后退法，而在3 mm水平，两种预备的的效果无明显差别。 　　关键词：根管预备；根管充填；牙胶充填面积 　　中图分类号：R781.05文献标识码：A 　　A Comparison of Different Techniques for Preparating Root Canals 　　WANG Yan-ping1,LIU An-dong2 　　(1.Department of Stomatology, Hefei No.2 Peoples Hospital, Hefei 230011, Anhui,China；2.Department of Stomatology,Anhui Provincial No.2 Peoples Hospital, Hefei 230011, Anhui,China) 　　Abstract：ObjectiveThe aim of the study was to comparae step-back technique and step-down technique achived in root canals filled with the percentage of gutta-percha-filled area (PGFA) to evaluate the effect of two kinds of preparation methods.MethodsTwo groups of extracted human premolars (orthodontic treatment of pulling teeth) and single root canals(totally 20) were instrumented,which K files strictly according to step-back technique to prepare the root canal, which nickel-titanium instrument Mtwo strictly according to step-down technique prepare the root canal, after root canal preparation randomly divided into two groups, respectively, then the root canals were filled as follows:cold lateral condensation, and continuous wave of condensation. sections of each tooth was made 3,7 and 10mm from the apex to evaluate best two kinds of preparation methods.ResultsNo significant differences were found between the 2 different techniques at 3mm(P＞0.05);At 7mm and 10mm from the apex, step-down technique produced significantly higher than the step-back technique（P＜0.05). ConclusionThe step-down technique are more effective than the step-back technique ,but there was no significant differences between the 2 different techniques at 3mm . 　　Key words：Root canal preparation; Root canal obtur