不同根管预备技术对弯曲根管封闭性能的影响  

Effects of different preparation techniques on the sealing of root fillings in curved teeth in vitro

作　　者：刘智永[1] 盛芳[1] 郝新宇[1] 熊世江[1,2] 

机构地区：[1]山东大学口腔医学院综合科,济南250012 [2]山东省口腔生物医学重点实验室,济南250012

出　　处：《山东大学学报（医学版）》2010年第9期68-71,共4页Journal of Shandong University:Health Sciences

摘　　要：目的采用4种根管预备方法预备中重度弯曲根管,通过邻甲苯胺(O-TB)法检测各种方法对其弯曲根管充填后微渗漏的影响。方法选取人中重度弯曲单根管牙60颗,随机分为A、B、C、D4个实验组,每组12颗离体牙,分别用平衡力法、ProTaper/crown-down法、逐步深入法、逐步后退法对根管进行预备;设E、F两个对照组,即阳性对照组和阴性对照组,每组6颗离体牙,E组不进行预备,F组用ProTaper/crown-down法预备根管。建立葡萄糖微渗漏模型,充填后第30天应用邻甲苯胺(O-TB)法测量其葡萄糖浓度。结果第30天,E组葡萄糖浓度(8.41±1.76)mmol/L,F组未测得葡萄糖浓度,实验组葡萄糖浓度分别为(4.22±0.53)、(4.51±0.70)、(4.86±1.30)、(7.62±1.35)mmol/L;逐步后退法渗漏的葡萄糖浓度明显高于平衡力法、ProTaper/crown-down法、逐步深入法(P<0.05)。平衡力法、ProTaper/crown-down法、逐步深入法之间渗漏的葡萄糖浓度差异无统计学意义(P>0.05)。结论在其它条件相同的情况下,短期内应用平衡力法、ProTaper/crown-down法预备中重度弯曲根管与逐步后退法相比,有利于弯曲根管充填后根管的封闭能力。Objective To evaluate the sealing ability of curved root canals prepared by different preparation methods.Methods Sixty curved human maxillary anterior and premolar teeth were divided randomly into four experimental groups （A,B,C,D; 12 teeth per group） and two control groups（E,F; 6 teeth per group） .The experimental groups were prepared by using the balanced force technique（A） ,the ProTaper/crown-down technique（B） ,the step-down technique（C） ,the step-back technique（D） and obturated by cold laterally compacted guttapercha with Cortisomol sealer.Control groups included six positive and six negative subjects.Leakage along the root filling was measured by concentration of glucose in the apical reservoir on the thirtieth days with the O-TB method.Results Leakage was outstanding in the positive controls but could not be detected in the negative controls.Mean concentrations of glucose of the four experimental groups were （4.22±0.53） ,（4.51±0.70） ,（4.86±1.30） and （7.62±1.35） mmol/L,respectively.There was significant difference between the step-back technique and the other three preparation methods （P0.05） .No difference among the balanced force technique group,the ProTaper/crown-down technique and step-down technique group was observed （P0.05） .Conclusion The sealing ability of the balanced force technique,the ProTaper/crown-down technique and the step-down technique is better than that of the step-back technique in curved teeth in vitro.

关 键 词：弯曲根管 封闭性能 预备方法 O-TB法 

分 类 号：R781.03[医药卫生—口腔医学]