不同锥度根管锉对根管壁抗折强度的影响

doi:10.19439/j.sjos.2020.05.005

上海口腔医学 ›› 2020, Vol. 29 ›› Issue (5): 471-475.doi: 10.19439/j.sjos.2020.05.005

不同锥度根管锉对根管壁抗折强度的影响

邱晓键¹, 肖善社¹, 谷雪莲^1,*, 朱来宽^2,4,*, 蒋倩^3,4

1.上海理工大学医疗器械与食品学院,上海 200093;
2.上海交通大学医学院附属第九人民医院·口腔医学院牙体牙髓病科,3.口腔外科,上海 200011;
4.国家口腔疾病临床医学研究中心,上海市口腔医学重点实验室,上海市口腔医学研究所,上海 200011

收稿日期:2019-11-25 修回日期:2020-03-10 出版日期:2020-10-25 发布日期:2020-11-02
通讯作者: 谷雪莲,E-mail：guxuelian@usst.edu.cn;朱来宽,E-mail：zhulk1997@163.com。^*共同通信作者
作者简介:邱晓键（1997-）,男,学士,E-mail：qxj_9765@163.com
基金资助:
国家自然科学基金(31800816); 上海理工大学医工交叉项目(10-19-308-503); 上海交通大学医学院附属第九人民医院基础研究助推计划(JYZZ038)

Effect of different root canal file tapers on fracture strength of root canal wall

QIU Xiao-jian¹, XIAO Shan-she¹, GU Xue-lian¹, ZHU Lai-kuan^2,4, JIANG Qian^3,4

1. School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology. Shanghai 200093;
2. Department of Endodontics and Operative Dentistry, 3. Department of Oral Surgery, Shanghai Ninth People's Hospital, Collage of Stomatology, Shanghai Jiao Tong University School of Medicine. Shanghai 200011;
4. National Clinical Research Center for Oral Disease, Shanghai Key Laboratory of Stomatology, Shanghai Research Institute of Stomatology. Shanghai 200011, China

Received:2019-11-25 Revised:2020-03-10 Online:2020-10-25 Published:2020-11-02

摘要/Abstract

摘要： 目的：比较不同锥度镍钛根管锉对根管壁抗折强度的影响,并探讨有限元分析在根管治疗中的应用价值。方法：选取24颗离体下颌前磨牙,去除冠部后,随机分为 A、B、C、D 4组。A、C 2组使用0.04锥度Z-K3镍钛锉进行根管预备,B、D 2组使用0.06锥度Z-K3镍钛锉进行根管预备。对根管预备后的C、D 2组进行3次2 mm切片处理。从A、B组中随机选取2个样本,使用micro-CT进行扫描。将扫描模型导入不同软件,进行优化,并建立装配体模型,导入Ansys进行有限元分析。使用万能试验机与加力棒对样本施加100 N的力,直到样本任一处发生折裂,记录断裂载荷并进行对比分析。结果：有限元分析结果显示,0.04、0.06锥度模型的最大应力值分别为138.88 MPa和78.812 MPa。A、B组样本平均断裂载荷分别为490.12 N和501.83 N,C、D组牙切片的最大平均断裂载荷出现在颈部,分别为93.61 N和141.53 N。从颈部,到中部,再到尖部,根管的平均断裂载荷依次减小。结论：对于形态正常的下颌前磨牙,使用0.06锥度的镍钛旋转锉对根管进行处理,得到的根管抗折强度比使用0.04锥度处理更高。三维有限元分析法可以指导在根管治疗中选择合适锥度的锉,以降低根折发生率。

关键词: 镍钛旋转锉, 锥度, 抗折强度, 有限元分析

Abstract: PURPOSE: To compare the effects of different nickel-titanium rotary tapers on fracture strength of root canal and the application value of finite element analysis in root canal therapy. METHODS: Twenty four mandibular premolars were selected and all crowns were removed. All samples were randomly divided into 4 groups: A, B, C and D. Group A and C were instrumented with Z-K3 nickel titanium file as 0.04 taper for root canal preparation. Group B and D were instrumented with Z-K3 nickel titanium file as 0.06 taper. Group C and D were sliced into 2 mm thick slices 3 times after root canal preparation. Two teeth were selected from group A and group B and scanned with micro-CT. The model was imported into different softwares to optimize. The assembly model was built and imported into ANSYS for finite element analysis. Universal testing machine and force bar were used to apply 100 N force to samples until fracture occurring at any place of tooth sample. The fracture load was recorded and comparative analysis was conducted. RESULTS: The results of finite element analysis showed that the maximum stress of 0.04, 0.06 taper models was 138.88 MPa and 78.812 MPa, respectively. The average fracture load of group A, B was 490.12 N and 501.83 N, respectively. In group C and D, the maximum average fracture load was 93.61 N and 141.53 N, respectively. From the neck to the middle and then to the tip, the average fracture load of root canal decreased in turn. CONCLUSIONS: For normal form mandibular premolars, the fracture strength of the root instrumented with 0.06 taper nickel titanium rotary file was significantly higher than that instrumented with 0.04 taper. Three dimensional finite element analysis could guide dentists to choose a suitable taper file in root canal treatment to reduce the incidence of root fracture.

Key words: Nickel-titanium rotary file, Taper, Fracture strength, Finite element analysis

中图分类号:

R783.1

邱晓键, 肖善社, 谷雪莲, 朱来宽, 蒋倩. 不同锥度根管锉对根管壁抗折强度的影响[J]. 上海口腔医学, 2020, 29(5): 471-475.

QIU Xiao-jian, XIAO Shan-she, GU Xue-lian, ZHU Lai-kuan, JIANG Qian. Effect of different root canal file tapers on fracture strength of root canal wall[J]. Shanghai Journal of Stomatology, 2020, 29(5): 471-475.

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不同锥度根管锉对根管壁抗折强度的影响

Effect of different root canal file tapers on fracture strength of root canal wall

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