三种镍钛机动器械预备后牙弯曲根管的成形效果  

The shaping effects of three nickel-titanium rotary instruments on preparing curved canals in posterior teeth

作　　者：韦曦[1] 凌均棨[1] 张顺彬[2] 

机构地区：[1]中山大学光华口腔医学院牙体牙髓科,广州510055 [2]香港大学牙学院保存齿科

出　　处：《中华口腔医学杂志》2002年第5期333-335,共3页Chinese Journal of Stomatology

摘　　要：目的　研究 3种镍钛机动系统预备后牙弯曲根管的成形效果。方法　选择离体下颌磨牙近中弯曲根管 64个 ,包埋于Branmante模型中 ,随机分为 4组 :①Flexofile;②LightSpeed;③ProFile ;④QantecSC。根管预备至 30号器械 (主尖锉 ) ,分析各组的牙本质切削面积、根管壁最小厚度和根管中心偏移。结果　Flexofile组在根尖区和根中段 ,牙本质切削面积和根管中心的偏移均为最大 ,与LightSpeed和ProFile组间的差异具有显著性 (P <0 0 5) ,QantecSC在根尖区有过度切削 ;根中段远中侧的牙本质最小厚度在Flexofile组为最小 ,与LightSpeed组间的差异具有非常显著性 (P <0 0 1 ) ;在根中段 ,Flexofile组中 87%的根管中心移向远中侧 ,镍钛各组中 ,仅 1 /3的根管中心移向远中。结论Flexofile预备弯曲根管 ,根尖和根中段成形不良 。Objective To investigate the shaping effects of three nickel titanium rotary instruments on preparing curved canals in posterior teeth Methods 64 curved mesial canals of extracted lower molars, embedded in the Branmante models, were randomly assigned to four groups: ①Flexofile;②LightSpeed;③ProFile;④Qantec SC Apical preparation was carried out till size 30 The area of dentine removal, least remaining dentine thickness and transportation of canal center were measured Results Flexofile resulted in more dentine removal and canal center transportation than LightSpeed and ProFile ( P <0 05) at the apical and mid root levels. In the mid root sections, Flexofile left the thinnest dental wall in the distal aspect; 87% of the canal centers in the Flexofile group were transported in a distal direction as compared with one third in other groups Conclusions LightSpeed and ProFile exhibited better shaping ability than Flexofile in preparing curved canals

关 键 词：后牙 根管制备 牙科器械 镍 钛 

分 类 号：R781.05[医药卫生—口腔医学]