转速及操作者对Hero642机用镍钛锉破坏的影响  

Influence of rotational speed and operator's proficiency on failure of nickel-titanium rotary instrument Hero 642

作　　者：李焱[1] 唐继伟[1] 杨剑少[1] 

机构地区：[1]广西壮族自治区人民医院口腔内科,南宁市530021

出　　处：《微创医学》2010年第3期197-199,共3页Journal of Minimally Invasive Medicine

基　　金：广西区卫生厅科研基金资助项目(合同号:Z2007145)

摘　　要：目的通过体外实验探讨不同转速及操作者对Hero 642机用镍钛锉使用后出现变形或折断的影响。方法实验分两大组。A组的两个亚组由同一位技术熟练的操作者分别使用两种不同减数比的根管治疗手机进行根管预备;B组的三个亚组均使用同一减数比的根管治疗手机,分别由经验不同的三名操作者完成根管预备。每个亚组中有100个人类离体牙根管,每只Hero 642机用镍钛锉最多预备10个根管。比较亚组之间变形、折断的器械数目。结果 A组中均未出现器械变形和折断;B组中变形和折断的器械分别为13支和6支,经验丰富的操作者使用的器械未出现折断;第五亚组中器械变形率和折断率与第三、第四亚组相比较均有显著性差异。结论对于有丰富经验的操作者,转速增加至300 rpm不会引起器械折断,临床操作经验的积累对减少器械折断是重要的影响因素。Objective To evaluate the influence of rotational speed and operator＇s proficiency with a specific nickel-titanium rotary instrumentation technique on the incidence of deformation and separation of instruments. Meth- ods The study was designed as two parts：Group A was divided into 2 subgroups （ Group 1 and Group 2, in which one proficient operator finished canal preparation with different rotational speeds）, and Group B was divided into 3 subgreups（Group 3 ,Group 4,and Group 5, in which the canals were prepared with the same rational speed but by op- erators with varying proficiency）. All subgroups were due to finish 100 canals and each Hero 642 to prepare 10 canals at most. N, mhers of instrument deformation and separation of each subgroup were compared. Results In Group A, instrument deformation and separation did not occur. In Group B,13 and 6 instruments were deformed and separated, but none of these occurred in the subgroup operated by proficient operator. There existed a significant difference be- tween Group 5 （the least experienced operator） and other two groups （ Group 3 and Group 4） with respect to instru- ment deformation and separation. Conclusion Operation experience accumulation is crucial to prevent instrument separation and reduce the incidence of deformation. Rotational speed as high as 300 rpm is still safe with the experienced operator.

关 键 词：转速 操作者 机用镍钛锉 破坏 

分 类 号：R781.05[医药卫生—口腔医学]