不同基底冠材料对上颌中切牙全瓷冠受载应力分布的影响

›› 2013, Vol. 4 ›› Issue (2): 74-78.

不同基底冠材料对上颌中切牙全瓷冠受载应力分布的影响

胡建¹,章非敏²,戴宁³,鲍益东¹,马骏驰¹

1. 南京医科大学附属口腔医院
2. 南京医科大学口腔医学研究所附属口腔医院修复科
3. 南京航空航天大学机电学院

收稿日期:2013-05-06 修回日期:2013-05-27 出版日期:2013-06-25 发布日期:2013-06-26
通讯作者: 章非敏 E-mail:fmzhang@njmu.edu.cn
基金资助:
江苏省高校高新技术产业化推广项目;江苏高校优势学科建设工程资助项目

The effect of different core materials on the stress distribution in layered crown of the upper incisor

Received:2013-05-06 Revised:2013-05-27 Online:2013-06-25 Published:2013-06-26

摘要/Abstract

摘要： 目的：研究上中切牙不同基底冠材料全瓷冠受载时的应力分布特点。方法：运用逆向工程软件构建上颌中切牙全瓷冠（双层冠结构）的三维有限元数值模型，选择氧化锆全瓷冠、氧化铝全瓷冠为实验组，贵金属烤瓷冠为对照组，施以不同部位静态载荷模拟加载，分析其应力分布趋势的异同。结果：应力分布云图显示，不同基底冠材料的全瓷冠应力分布趋势相同，载荷区和全冠颈缘为应力集中区，其中应力极值点位于载荷点。不同基底冠材料全瓷冠的应力值不同，随着材料弹性模量的增加，基底冠的等效应力极值相应增加，而饰面瓷则适当减小；基底冠弹性模量的增加也会使得基底冠与预备体界面、基底冠与饰面瓷界面以及邻面颈缘的张应力显著提高，饰面瓷的张应力则稍有下降。结论：高弹性模量基底冠可降低上中切牙全瓷冠饰面瓷的折裂风险。

关键词: 全瓷冠, 三维有限元, 基底冠, 饰面瓷, 应力分布

Abstract: Objective：To investigate the stress distributions in an all-ceramic crown of the upper central incisor with different core ceramics under load. Methods：The 3-dimensional finite element model of layered crown was constructed using CAD software. This crown model was made with gold, zirconia, and alumina core and veneering porcelains. A loading simulating the maximum bite force (200 N) was applied to the crown at different locations (incisal edge, lingual fossa, lingual margin). The stress values of full crown was calculated and expressed, as stress intensity, in MPa. Results：The simulation showed that, the tendency of stress distributions in an all-ceramic crown with different core materials was similar. The MPS (maximal principal stress) value was located in the region submitted to the load and the proximal margin. As the elastic modulus of core materials increased, the maximal stress value of von Mises in veneer decreased, however that in core increased. Moreover, the MPS in core/veneer interface, core/tooth preparation interface, and proximal margin increased, but the MPS in veneer decreased. Conclusions：The use of core materials with high elastic modulus would reduce the risk of veneer chipping.

Key words: All-ceramic crown, 3-dimensional finite element, Core ceramic, Veneer, Stress distribution

胡建章非敏戴宁鲍益东马骏驰. 不同基底冠材料对上颌中切牙全瓷冠受载应力分布的影响[J]. , 2013, 4(2): 74-78.

参考文献

[1]胡柏,王贻宁.全瓷冠桥抗折性能研究进展[J].临床口腔医学杂志,2005,21(1):58-59.
[2]王少萍,繁洪.全瓷冠桥抗折性能的研究[J].医学综述,2010,16(15):2323-2326.
[3]胡建,戴宁,李泷杲,等.配准法建立上中切牙全瓷冠的三维有限元模型[J].口腔医学,2010,30(4):206-208.
[4]De Jager N, de Kler M, van der Zel JM.The influence of different core material on the FEA-determined stress distribution in dental crowns[J].Dent Mater,2006,22(3):234-242.
[5]Motta AB, Pereira LC, da Cunha AR.All-ceramic and porcelain-fused-to-metal fixed partial dentures: a comparative study by 2D finite element analyses[J].J Appl Oral Sci,2007,15(5):399-405.
[6]Malament KA, Socransky SS.Survival of Dicor glass-ceramic dental restorations over 14 1999s: Part I. Survival of Dicor complete coverage restorations and effect of internal surface acid etching, tooth position, gender, and age[J].J Prosthet Dent,1999,81(1):23-32.
[7]Fradeani M, Redemagni M.An 11-2002 clinical evaluation of leucite-reinforced glass-ceramic crowns: a retrospective study[J].Quintessence Int,2002,33(7):503-510.
[8]McLaren EA, White SN.Survival of In-Ceram crowns in a private practice: a prospective clinical trial[J].J Prosthet Dent,2000,83(2):216-222.
[9]Odén A, Andersson M, Krystek-Ondracek I, et al.Five-1998 clinical evaluation of Procera AllCeram crowns[J].J Prosthet Dent,1998,80(4):450-456.
[10]Luthardt RG, Holzhüter M, Sandkuhl O, et al.Reliability and properties of ground Y-TZP-zirconia ceramics[J].J Dent Res,2002,81(7):487-491.
[11]Pallis K, Griggs JA, Woody RD, et al.Fracture resistance of three all-ceramic restorative systems for posterior applications[J].J Prosthet Dent,2004,91(6):561-569.
[12]Jia J, Duan YY, Zhang SF, et al.A Three-dimensional finite element analysis of all-ceramic crowns of the first mandibular molar[J].J US -China Med Sci,2007,4(1):27-30.
[13]Imanishi A, Nakamura T, Ohyama T, et al.3-D Finite element analysis of all-ceramic posterior crowns[J].J Oral Rehabil,2003,30(8):818-822.
[14]Rekow ED, Silva NR, Coelho PG, et al.Performance of dental ceramics: challenges for improvements[J].J Dent Res,2011,90(8):937-952.
[15]Guazzato M, Proos K, Quach L, et al.Strength, reliability and mode of fracture of bilayered porcelain/zirconia (Y-TZP) dental ceramics[J].Biomaterials,2004,25(20):5045-5052.
[16]Silva NR, Bonfante EA, Zavanelli RA, et al.Reliability of metalloceramic and zirconia-based ceramic crowns[J].J Dent Res,2010,89(10):1051-1056.
[17]N?p?nkangas R, Raustia A.Twenty-2008 follow-up of metal-ceramic single crowns: a retrospective study[J].Int J Prosthodont,2008,21(4):307-311.
[18]Pr?bster L.Compressive strength of two modern all-ceramic crowns[J].Int J Prosthodont,1992,5(5):409-414.
[19]Neiva G, Yaman P, Dennison JB, et al.Resistance to fracture of three all-ceramic systems[J].J Esthet Dent,1998,10(2):60-66.