目的 探讨沟裂结构对应力分布的影响。方法 建立包含沟裂的下颌第一磨牙有限元模型。采用Micro-CT扫描及ANSYS软件建立包含及不包含
面沟裂的下颌第一磨牙有限元模型,并加载500 N载荷,对比两模型应力分布情况。结果 两模型中,拉应力峰值均出现在中央窝沟处,实验组中拉应力峰值为92.48 MPa,对照组为71.34 MPa,实验组拉应力峰值及沟裂处拉应力范围均大于对照组。结论 通过对下颌第一磨牙有限元模型进行力的初步加载,发现
面沟裂结构的存在影响力在下颌第一磨牙的分布,对进一步研究隐裂牙受力情况研究提供了基础。
Abstract
Objective To investigate the effect of grooves and fissures on stress distribution of the right mandibular first molar.Methods An intact first mandibular molar was scanned with Micro-CT, before ANSYS14.0 software was used to establish a three-dimensional finite element model of the right first molar with or without grooves. 500N was loaded to compare the stress distribution in the two models.Results n the two models, the tensile stress appeared in the fovea groove. The peak tensile stress was 92.48 MPa in the experimental group and 71.34 MPa in the control .The stress peak value and distribution of tensile stress in the experimental group were significantly greater than those in the control group. Conclusion After loading on the two models, it is found that the existence of the grooves structure affects the stress distribution of the mandibular first molar, which requires further research.
关键词
下颌第一磨牙 /
沟裂 /
三维有限元 /
应力分布
Key words
mandibular first molar /
groove /
three-dimensional finite element /
stress distribution
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] Amaral M T, Guedes-Pinto A C, Chevitarese O C. Effects of a glass -ionomer cement on the remineralization of occlusal caries-an in situ study[J]. Braz Oral Res,2006, 20(2): 91-96.
[2] Srirekha A, Bashetty K. Infinite to finite: an overview of finite element analysis[J]. Indian J Dent Res, 2010, 21(3): 425-432.
[3] 曾 艳,王嘉德. 下颌第一恒磨牙三维有限元模型的建立及应力分析[J].中华口腔医学杂志, 2009, 40(5): 394-397.
[4] Rodrigues F P, Li J, Silikas N. Sequential software processing of micro-XCT dental-images for 3D-FE analysis[J]. Dent Mater, 2009, 25: 47-55.
[5] Lima I N, Barbosa G F, Soares R B,et al. Creating three-dimensional tooth models from tomographic images[J]. Stomatologija, 2008, 10(2): 67-71.
[6] 周书敏,何明元,张延宏,等.牙根尖区应力分布的三维有限元计算[J].北京大学医学学报, 1988, 20: 31-35.
[7] 符红梅,贾 静,朱晓英,等.根管治疗后下颌磨牙采用各种充填材料修复的三维有限元分析[J].口腔颌面修复学杂志,2014,15(2):75-79.
[8] Takada H, Abe S, Tamatsu Y, et al. Three- dimensional bone microstructures of the mandibular angle using micro- CT and finite element analysis: relationship between partially impacted mandibular third molars and angle fractures[J]. Dent Traumatol, 2006, 22(1):18-24.
[9] Dejak B, Mlotkowski A, Romanowicz M. Finite element analysis of mechanism of cervical formation in simulated molars during mastication and paratunction[J]. J Prosthet Dent, 2005, 94: 520-529.
[10] Cuy J L, Mann A B, Livi K J, et al. Nanoindentation mapping of the mechanical properties of human molar tooth enamel[J] . Archives of Oral Biology, 2002, 47: 281-291.
[11] Kim I,Paik K S,Lee S P. Quantitative evaluation of the accuracy of micro-computed tomography in tooth measurement[J]. Clin Anat, 2007, 20(1): 27-34.[12] Benazzi S, Kullmer O. Using occlusal wear information and finite element analysis to investigate stress distributions in human molars[J]. J of Anat ,2011,219: 259-272.
[13] Magne P, Belser U C . Rationalization of shape and related stressdistribution in posterior teeth: a finite element study using nonlinear contact analysis[J]. Int J Periodontics Restorative Dent,2002, 22: 425-433.
[14] Benazzi S, Kullmer O, Grosse I R, et al. Unravelling the functional biomechanics of dental features and tooth wear[J]. Plos One, 2013, 8(7): 1-10.
[15] Finke M, Hughes J A, Parker D M, et al. Mechanical properties of in situ demineralised human enamel measured by AFM nanoindentation[J]. Surface Science, 2001, 491: 456-467.
[16] Ge J, Cui F Z, Wang X M, et al. Property variations in the prism and the organic sheath within enamel by nanoindentation[J]. Biomaterials. 2005, 26(16): 3333-3339.
PDF(1455 KB)
