不同镍钛根管预备系统对牙本质裂纹形成的影响  

Effects of different nickel-titanium root canal preparation systems on the dentin crack formation

作　　者：熊伯刚 牛光良 柴媛[2] Xiong bogang;Niu guangliang;Chai yuan(Department of Stomatology · Beijing hospital of integrated traditional Chinese and western medicine · Beijing university ofChinese medicine affliated hospital of integrated traditional Chinese and western medicine,Beijing;Beijing key laboratory oforal digital medicine,national engineering laboratory of oral technology and materials,materials research laboratory,stomatology,school of stomatology,Peking University,Beijing100039)

机构地区：[1]北京市中西医结合医院.北京中医药大学附属中西医结合医院口腔科,北京100039 [2]北京大学口腔医学院.口腔医院材料研究室口腔数字化医疗技术和材料国家工程实验室口腔数字医学北京市重点实验室,北京100039

出　　处：《口腔材料器械杂志》2018年第4期190-194,共5页Chinese Journal of Dental Materials and Devices

基　　金：首都卫生发展科研专项项目(编号:首发2014-2-7014)

摘　　要：目的探讨不同镍钛旋转预备系统ProTaper Universal (PU)、ProTaper Next(PN)和X+File(X+)对牙本质微裂纹形成的影响。方法将100颗下颌前磨牙随机分为4组(n=25)。组1为对照组(不做根管预备);组2为PU预备组(SX预备根管口,S1、S2、F1、F2预备直达工作长度);组3为PN预备组(Protaper Universal SX预备根管口,再用ProTaper Next X1、X2预备直达工作长度)。组4为X+预备组(Protaper Universal SX预备根管口,然后用X+File X1、X2预备直达工作长度)。预备完成后,所有离体牙在距根尖顶点3mm、6mm和9mm处垂直于牙体长轴做横切片,在根管显微镜下观察并记录裂纹形成情况。卡方检验对裂纹形成数目进行统计分析。结果对照组未产生牙本质裂纹。镍钛旋转系统PU、PN和X+的牙本质裂纹发生率分别为60%,32%和24%(P<0.05)。仅PU组产生完全裂纹,且数目高于另外3组(P<0.05)。在根尖1/3处,PU组的不完全裂纹数高于另外3组(P<0.05)。PN组和X+组的牙本质裂纹发生率无明显差异(P>0.05)。结论本研究中使用的3种镍钛根管预备系统均产生了牙本质裂纹。其中,X+File与ProTaper Next产生的牙本质裂纹较少,这可能与镍钛金属结构、尖端设计以及中心定位能力有关。Objective The effects of different nicel-titanium rotary systems of ProTaper Universal （PU）, ProTaper Next （PN） and X＋File （X＋） on dentin cracs formation were investigated. Methods One-hundred man-dibular premolars were chosen and divided into 4 groups randomly （n=25）. Gr 1 was as control group （no prepara-tion）; Gr 2 was as PU preparation group （the coronal one-thirds of the canals were prepared with Sx and S1, S2, F1 and F2 instruments were used for the woring length）; Gr 3 was as PN preparation group （the coronal one-thirds of the canals were prepared with Sx and X1, X2 were used for the woring length）; Gr 4 was as X＋ preparation group （the coronal one-thirds of the canals were prepared with Sx and X1, X2 were used for the woring length）.All the prepared roots were horizontally sectioned at 3mm, 6mm and 9 mm from the apex. The cracs were ob-served by endodontic microscope. The cracs formation was recorded and analyzed with a Chi-square test. Results No dentin crac was observed in the control group. The incidences of dentin crac formation in different nicel-titanium rotating systems of PU,PN and X＋ were 60%, 32% and 24% respectively. Only complete cracs were observed in PU group and the number was higher than that in three other groups （P〈0.05）. At 3mm level, the num-ber of incomplete crac in PU group was higher than that in three other groups （P〈0.05）. There was no signifcant difference in the incidence of dentin crac formation between PN group and X＋ group （P〉0.05）. Conclusion All three different nicel-titanium rotating systems of PU, PN and X＋ used in this study caused dentin crac formation. Among them, X＋File and ProTaper Next produced fewer dentin cracs. Niceltitanium structure, tips design and central location capability may be the reason for the less dentin crac.

关 键 词：牙本质裂纹 镍钛旋转系统 根管预备 

分 类 号：R781.05[医药卫生—口腔医学]