|
|
- 2016
不同体积和材料的桩核修复薄弱根管的应力分析
|
Abstract:
摘要 目的:分析两种体积不同桩核材料修复薄弱根管的应力分析。方法: 用三维有限元法将建立的9个实验模型分为两组, A组为预成桩核组,B组为解剖形桩核组,将纤维桩联合一根辅桩修复的模型作为A、B两组的对照。在模型牙冠切1/3与中1/3处链接5个点成线状135度100 N的力加载。比较分析各模型牙体组织、树脂粘结剂、桩核3个部位的应力。结果:牙体组织应力值大小与体积成负相关,与弹性模量的变化无关。桩核表面的应力值与弹性模量成负相关。结论:建议使用铸造桩核、编织纤维桩以及纤维桩联合辅桩等体积较大的桩核修复薄弱根管。桩核材料弹性模量的增加可能会增加桩核脱位的风险
| [1] | Rees JS, Jacopsen PH. Elastic modulus of the periodontal ligament [J]. Biomaterials, 1997, 18(1)∶995-999 |
| [2] | Asmussen E, Peutzfeld A, Sahafi A. Finite element analysis of stresses in endodontically treated, dowel-restored teeth [J]. J Prosthet Dent, 2005, 94(4)∶321-329 |
| [3] | Yang H, Lang LA, Molina A, et al. The effects of dowel design and direction on dowel-and-core restorations [J]. J prosthet Dent, 2001,85(6)∶558-567 |
| [4] | Marchi GM, P8uIillo I.A,Pimenta LA. Effect of different filling materials in combination with intraradicular post on the resistance to fracture of weakened roots [J]. J oral Rehabjl, 2003, 30(6)∶623-629 |
| [5] | Ozcopur B, Akman S, Eskitascioglu G, et al. The effect of different posts on fracture strength of roots with vertical fracture and re-attached fragments [J]. Journal of Oral Rehabilitation, 2010, 37(8)∶615-623 |
| [6] | QLi , BXu , Y Wang, et al. Effects of auxiliary fiber posts on endodontically treated teeth with flared canals [J]. Operative Dentistry, 2011, 36(4)∶380-389 |
| [7] | Mattos CM, Las Casas EB, Dutra IG, et al. Numerical analysis of the biomechanical behaviour of a weakened root after adhesive reconstruction and post-core rehabilitation [J]. J Dent, 2012, 40(5)∶423-432 |
| [8] | Aboushelib MN, Jager ND, Kleverlaan CJ, et al. Effect of loading method on the fracture mechanics of two layered all-ceramic restorative systems [J]. Dent Mater, 2007, 23(8)∶952-959 |
| [9] | Albakry M, Guzzato M, Swain MV. Fracture toughness and hardness evaluation of three pressable all-ceramic dental materials [J]. J Dent, 2003, 31(3)∶181-188 |
| [10] | OyarP. The effects of post-core and crown material and luting agents on stress distribution in tooth restorations [J]. J Prosthet Dent, 2014, 112(2)∶211-219 |
| [11] | Akkayan B. An in vitro study evaluating the effect of ferrule length on fracture resistance of endodontically treated teeth restored with fiber-reinforeed and zireonia dowel systems [J]. J Prosthet Dent, 2004, 92(2)∶155-162 |
| [12] | M.N. Ash, S.J. Nelson. Wheeler's dental anatomy, physiology and occlusion [M]. Saunders, St Louis ,8th ed, 2003, 251-261 |
| [13] | S.A. Romeed, S.M. Dunne.Stress analysis of different post-luting systems: a three-dimensional finite element analysis [J]. Aust Dent J, 2013,58(1)∶82-88 |
| [14] | Meijer HJ, Kulper JH ,et al. Stress distribution around dental implants: influence of superstructure, length of implants,and height of mandible [J]. J prosthet Dent, 1992, 68(1)∶96-102 |
| [15] | Ruse ND. Propagation of erroneous data for the modulus of elasticity of periodontal lig-ament and gutta percha in FEM/FEA paper:a story of broken links [J]. Dent Mater, 2008, 24(12)∶1717-1719 |
| [16] | Hu YH, Pang LC, Hsu CC, et al. Fracture resistance of endodonticallv treated anterior teeth restored with four post and core systems [J]. Quintessence Int, 2003, 34(5)∶349-355 |
