口内数字化扫描仪辅助重建下颌第一磨牙髓腔固位冠修复三维有限元模型研究
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摘要
目的将口内数字化扫描仪创新性应用于三维有限元研究,探索出一种更为准确高效的牙体及其修复体的有限元建模方式。方法利用Trios口内数字化扫描仪及锥形束CT(CBCT)采集志愿者口内预备后牙体的原始图像数据,然后采用计算机辅助设计(CAD)系统设计制作修复体表面模型,于有限元软件Mimics10.0中建立牙体表面模型,最终在ANSYS 14.0软件中完成两部分模型的整合得到实体模型。结果本研究基于口内扫描仪及CBCT数据建立了真实而准确的下颌第一磨牙髓腔固位冠修复的三维有限元模型,共有单元格数25 776,节点数44 728,有限元模型与天然牙体同一层面近远中径及颊舌径所测得偏差值仅为-0.28%和-0.27%,小于等于文献记载传统方式有限元建模的偏差值-0.28%。结论通过将口内数字化扫描仪引入于三维有限元研究,探索出了一种创新性建模方法,可大为简化传统建模步骤,有效减少建模过程中的数据损失及人为因素所造成的误差。本研究所建模型与口内天然牙的几何相似度极高,精确度和通用性均优于传统建模方式,为后续的有限元分析(FEA)研究奠定了坚实基础。
Objective To find a more effective and accurate way of three-dimensional finite element modeling by innovatively taking advantage of an intraoral digital scanner. Methods Prepared tooth was scanned by the intraoral digital scanner Trios and CBCT to get the imaging data. The restoration surface model was designed and made in CAD system;the tooth surface model was established in Mimics 10.0;the two models were integrated into a entity model in ANSYS 14.0. Results On the basis of the data collected by the intraoral digital scanner and CBCT,we constructed a three-dimensional finite element model of a mandibular first molar restored by endocrown with high imitation and high accuracy,with 25776 grids and 44728 nodes. The deviation between the finite element model and the natural tooth was-0.28% and-0.27%,which was equal to or even less than the deviation previously documented. Conclusion By introducing the intraoral digital scanner into the three-dimensional finite element research,an innovative modeling method is found,which greatly simplifies the traditional modeling steps and effectively reduces the data loss during the modeling process and the errors caused by the human factors. The geometric similarity between the model and the natural tooth in this study is very high,and the accuracy and versatility are superior to those of the traditional modeling methods,which lays a solid foundation for the follow-up finite element analysis.
Objective To find a more effective and accurate way of three-dimensional finite element modeling by innovatively taking advantage of an intraoral digital scanner. Methods Prepared tooth was scanned by the intraoral digital scanner Trios and CBCT to get the imaging data. The restoration surface model was designed and made in CAD system;the tooth surface model was established in Mimics 10.0;the two models were integrated into a entity model in ANSYS 14.0. Results On the basis of the data collected by the intraoral digital scanner and CBCT,we constructed a three-dimensional finite element model of a mandibular first molar restored by endocrown with high imitation and high accuracy,with 25776 grids and 44728 nodes. The deviation between the finite element model and the natural tooth was-0.28% and-0.27%,which was equal to or even less than the deviation previously documented. Conclusion By introducing the intraoral digital scanner into the three-dimensional finite element research,an innovative modeling method is found,which greatly simplifies the traditional modeling steps and effectively reduces the data loss during the modeling process and the errors caused by the human factors. The geometric similarity between the model and the natural tooth in this study is very high,and the accuracy and versatility are superior to those of the traditional modeling methods,which lays a solid foundation for the follow-up finite element analysis.
引文
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[15]叶红强,柳玉树,刘云松,等.口内数码摄影辅助构建三维彩色数字牙列模型[J].北京大学学报(医学版),2016,48(1):138-142.
[16]Holberg C,Winterhalder P,Holberg N,et al.Direct versus indirect loading of orthodontic miniscrew implants--an FEM analysis[J].Clin Oral Investig,2013,17(8):1821-1827.
[17]Hu J,Dai N,Bao Y,et al.Effect of different coping designs on all-ceramic crown stress distribution:a finite element analysis[J].Dent Mater,2013,29(11):e291-e298.
[18]Guo J,Wang XY,Li XS,et al.Influence of different designs of marginal preparation on stress distribution in the mandibular premolar restored with endocrown[J].Nan Fang Yi Ke Da Xue Xue Bao,2016,36(2):200-204.
[2]Holberg C,Winterhalder P,Wichelhaus A,et al.Fracture risk of lithium-disilicate ceramic inlays:a finite element analysis[J].Dent Mater,2013,29(12):1244-1250.
[3]Er O,Kilic K,Esim E,et al.Stress distribution of oval and circular fiber posts in amandibular premolar:a three-dimensional finite element analysis[J].J Adv Prosthodont,2013,5(4):434-439.
[4]Dejak B,M?otkowski A,Langot C.Three-dimensional finite element analysis of molars with thin-walled prosthetic crowns made of various materials[J].Dent Mater,2012,28(4):433-441.
[5]顾卫芹,赵守亮,王人鹏.下颌第一恒磨牙三维有限元模型的建立[J].中国临床实用医学,2010,4(11):36-37.
[6]郭娜,游素兰,黄远亮.下颌第一磨牙平台转移种植体三维有限元模型的建立[J].口腔材料器械杂志,2013,22(3):141-144.
[7]马雅静,李冰,武秀萍,等.64层螺旋CT在上颌第一磨牙桩核冠三维有限元模型建立中的应用[J].实用医学影像杂志,2016,17(3):195-197.
[8]Gaintantzopoulou MD,El-Damanhoury HM.Effect of preparation depth on the marginal and internal adaptation of computeraided design/computer-assisted manufacture endocrowns[J].Oper Dent,2016,41(6):607-616.
[9]Marghalani TY,Hamed MT,Awad MA,et al.Three-dimensional finite element analysis of custom-made ceramic dowel made using CAD/CAM technology[J].J Prosthodont,2012,21(6):440-450.
[10]Ausiello P,Franciosa P,Martorelli M,et al.Numerical fatigue3D-FE modeling of indirect composite-restored posterior teeth[J].Dent Mater,2011,27(5):423-430.
[11]Mangano FG,Veronesi G,Hauschild U,et al.Trueness and precision of four intraoral scanners in oral implantology:a comparative in vitro study[J].PLo S One,2016,11(9):e0163107.
[12]苏庭舒,孙健,陈丽萍.口内数字化印模扫描重复性的研究[J].口腔颌面修复学杂志,2014,15(5):291-296.
[13]Nakajima A,Murata M,Tanaka E,et al.Development of threedimensional FE modeling system from the limited cone beam CT images for orthodontic tipping tooth movement[J].Dent Mater J,2007,26(6):882-891.
[14]Huang Z,Chen Z.Three-dimensional finite element modeling of a maxillary premolar tooth based on the micro-CT scanning:a detailed description[J].J Huazhong Univ Sci Technol,2013,33(5):775-779.
[15]叶红强,柳玉树,刘云松,等.口内数码摄影辅助构建三维彩色数字牙列模型[J].北京大学学报(医学版),2016,48(1):138-142.
[16]Holberg C,Winterhalder P,Holberg N,et al.Direct versus indirect loading of orthodontic miniscrew implants--an FEM analysis[J].Clin Oral Investig,2013,17(8):1821-1827.
[17]Hu J,Dai N,Bao Y,et al.Effect of different coping designs on all-ceramic crown stress distribution:a finite element analysis[J].Dent Mater,2013,29(11):e291-e298.
[18]Guo J,Wang XY,Li XS,et al.Influence of different designs of marginal preparation on stress distribution in the mandibular premolar restored with endocrown[J].Nan Fang Yi Ke Da Xue Xue Bao,2016,36(2):200-204.