应用显微CT评估两种镍钛锉预备重度弯曲根管成形能力的实验研究  

Experiment Research on Evaluating the Shapping Ability of Two Nickel-Titanium Instruments to Prepare Severely Curved Canals with Micro-CT

作　　者：陈晓燕 马琰[1] 邱申彩 舍玉秀 吴佩玲[1] CHEN Xiao-yan;MA Yan;QIU Shen-cai;SHE Yu-xiu;WU Pei-ling(Department of Stomatology, the Second Affiliated Hospital of Xinjiang Medical University, Urumqi 830068,Xinjiang,China)

机构地区：[1]新疆医科大学第二附属医院口腔科,新疆乌鲁木齐830068

出　　处：《中国美容医学》2019年第1期122-125,共4页Chinese Journal of Aesthetic Medicine

基　　金：新疆维吾尔自治区自然科学联合基金(编号:2016D01C212)

摘　　要：目的:使用显微CT(micro-computdetomographicimaging,Micro-CT)扫描成像系统,观察比较ProTaperNext(PTN)和Twisted Files Adaptive(TFA)预备下颌磨牙近中弯曲根管的成形能力。方法:20颗近期拔除的具有两个独立且呈25°～35°近中根管的下颌磨牙,采用两种机用根管锉系统进行根管预备,Micro-CT扫描并三维重建根备前后并成像,对以下参数分析:根管容积、表面积、根管偏移、根管/根宽度比和预备时间。结果:PTN平均偏移范围为0.038～0.174mm,TFA为0.079～0.197mm,在各水平评估的参数的统计学比较无显著性差异(P>0.05)。根管预备完成后,所有根管在观测水平的根管宽度都不超过根宽的35%。结论:应用Micro-CT系流评估,PTN和TFA在根管偏移和对中能力上具有相似结果,两种器械没有出现过度切削牙本质,降低了根折的风险。Objective ProTaper Next(PTN)and Twisted Files Adaptive(TFA)systems were used to prepare the proximal and medial curved root canals of mandibular molars.Micro-CT scans were used to compare the shapping ability.Methods A total of 20 with two independent 25°to 35°curved mesial root canals of extracted first mandibular molars were scanned using micro-CT imaging before and after root canal preparation with the 2 instrument systems.Three-dimensional reconstruction and analysis of image data before and after root preparation.The following parameters:root canal volume,surface area,root canal transportation,root canal/root width ratio,and preparation time.Results The ProTaper Next averaged transportation range was 0.038 to 0.174mm,and the TFA was 0.079 to 0.197mm.There was no statistically significant difference in the parameters evaluated at each level(P>0.05).After root canal preparation,the root canal width of all root canals at the observation level did not exceed 35%of the root width.Conclusion PTN and TFA have similar results in root canal transportation and center ratio.Both instruments do not have excessive cutting dentin and reduce the risk of root fracture.

关 键 词：根管治疗 根管预备 MICRO-CT 根管偏移 牙本质厚度 

分 类 号：R781.33[医药卫生—口腔医学]