CAJ | 학술논문

目的探究台阶形成的原因。方法总结126例台阶形成的根管，按是否年轻恒牙、牙位及根管预备方法分组，分析比较各组根管台阶形成的构成比。结果126例台阶形成中年轻恒牙构成比4.76%，非年轻恒牙组95.23%；不同牙位台阶形成构成比不同，前牙组1.58%，双尖牙组19.84%，上颌磨牙组43.65%，下颌磨牙组34.92%；不同预备方法台阶形成构成比不同，标准法62.77%，逐步后退法26.60%，逐步深入法10.64%。结论：根管台阶形成与是否年轻恒牙、牙位及根管预备方法不同而存在差异（P＜0.05）。
목적탐구태계형성적원인。방법총결126례태계형성적근관，안시부년경항아、아위급근관예비방법분조，분석비교각조근관태계형성적구성비。결과126례태계형성중년경항아구성비4.76%，비년경항아조95.23%；불동아위태계형성구성비불동，전아조1.58%，쌍첨아조19.84%，상합마아조43.65%，하합마아조34.92%；불동예비방법태계형성구성비불동，표준법62.77%，축보후퇴법26.60%，축보심입법10.64%。결론：근관태계형성여시부년경항아、아위급근관예비방법불동이존재차이（P＜0.05）。
Objective To discuss the reasons of ledging formation during the process of root canal preparation. Methods 126 root canals with ledging formation were selected and grouped by young permanent or not, tooth bit and root canal preparation method,and each group was analyzed and compared by constituent ratio of ledging formation.Results In 126 root canals with ledging formation samples,The composition ratio of young permanent teeth were 4.76%,Non-young permanent teeth were 95.23%; anterior teeth were 1.58%,premolar were 19.84%,maxil ary molars were 43.65%,mandibular molars were 34.92%;standard methods were 62.77%,step-back technique were 26.60%,step-down technique were 10.64%.Conclusion There was statistic dif erent among the ratio of ledging formation due to yang permanent or not, tooth bit and root canal preparation method (P<0.05).