4种镍钛器械预备弯曲根管后成形能力比较  

Comparison of shaping ability of 4 nickel-titanium rotary instruments in preparation of curved root canals

作　　者：江慧超 汤玲玲 韩文利 JIANG Hui-chao;TANG Ling-ling;HAN Wen-li(Department of Cariology and Endodontology,Dalian Stomatological Hospital.Dalian 116021,Liaoning Province,China;Gaoerji Road Clinical Division,Dalian Stomatological Hospital.Dalian 116021,Liaoning Province,China;Department of Oral and Maxillofacial Radiology,Dalian Stomatological Hospital.Dalian 116021,Liaoning Province,China)

机构地区：[1]大连市口腔医院牙体牙髓病科,辽宁大连116021 [2]大连市口腔医院高尔基路门诊部,辽宁大连116021 [3]大连市口腔医院放射科,辽宁大连116021

出　　处：《上海口腔医学》2022年第1期44-47,共4页Shanghai Journal of Stomatology

基　　金：大连市医学科学研究计划(1811094)。

摘　　要：目的:比较4种镍钛器械预备弯曲根管后的成形能力。方法:收集临床上拔除的近颊根牙根弯曲度在20°~40°的上颌第一或第二恒磨牙40颗,随机分为4组,每组10颗,分别采用Protaper Universal、Protaper Next、TF、S3对近颊根进行根管预备。预备前、后采用Micro-CT扫描,使用Mimics17.0软件分析测量,分析参数包括根管偏移、轴中心率、根管体积、牙本质去除量、根管/牙根宽度比。采用SPSS 20.0软件包对数据进行统计学分析。结果:在距根尖1、3、5 mm处,Protaper Universal偏移值较大,与其他3种器械相比,差异具有统计学意义(P<0.05);在距根尖1 mm处,Protaper Universal的中心定位能力较差,与其他3种器械具有统计学差异(P<0.05)。预备后,各组之间牙本质去除量有统计学差异(P<0.05),Protaper Universal预备后的牙本质去除量最多。在根管冠方和根中,预备后的根管直径均小于该处牙根直径的39%。结论:Protaper Next、TF、S3较Protaper Universal更适合用于弯曲根管预备。PRUPOSE:To compare the shaping ability of 4 nickel-titanium rotary instruments in preparation of curved root canals.METHODS:Forty extracted human maxillary first or second molars with mesiobuccal root canal curvature ranging from 20°-40°were selected.The teeth were randomly equally divided into 4 groups(n=10).Mesial root canals were separately prepared using Protaper Universal,Protaper Next,TF,and S3 nickel-titanium instruments.A series of preoperative and postoperative images were taken by Micro-CT.Mimics 17.0 software was used to analyze the following parameters:canal transportation,centering ratio values,root canal volume,volume of removed dentin,and canal/root width ratio.Data analysis was performed by using SPSS 20.0 software package.RESULTS:In terms of canal transportation after preparation at 1,3 and 5 mm from the apex,Protaper Universal was more than the other three groups(P<0.05).The centering ratio value of Protaper Universal was significantly smaller than that of the other three groups at 1 mm from the apex(P<0.05).The amount of dentin removal was significantly different after instrumentation with the four test systems(P<0.05).Protaper Universal had the highest mean volume of removed dentin.After preparation,all root canals had a diameter that was not larger than 39%of the root diameter at the coronal and middle segments.CONCLUSIONS:Under the conditions of this study,Protaper Next,TF,S3 systems seem to be better choices than Protaper Universal system in preparing curved root canals.

关 键 词：镍钛器械 根管预备 根管偏移 弯曲根管 MICRO-CT 

分 类 号：R781.3[医药卫生—口腔医学]