下颌磨牙残冠纤维桩核冠修复的有限元应力分析
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摘要
目的分析下颌第一磨牙残冠不同缺损壁数的情况下,不同数目、不同部位的纤维桩核冠修复的应力分布情况和应力大小。方法利用三维有限元法建立下颌第一磨牙残冠2壁和3壁缺损情况下,不同数目和不同部位的纤维桩核冠修复模型,施加225N垂直向的静态载荷及动态载荷。记录两种载荷下各部位牙本质von Mises应力最大值和最大主应力。结果下颌磨牙2种缺损状态在动静态载荷下,未植入纤维桩组最大Von Mises应力最大,均高于植入纤维桩组,近中植入2根纤维桩组和植入3根纤维桩组的应力分布最均匀。下颌磨牙3壁缺损在静态载荷下,植入3根纤维桩组最大,Von Mises应力明显小于其他2组。结论 2壁缺损情况下,考虑选择植入1根纤维桩。3壁缺损情况下,可以考虑通过增加纤维桩数量来分散应力,减小牙体折裂风险。
Objective The purpose of this study was to analyze the stress magnitude and distribution of mandibular first molar with various residual crowns restored by different numbers of fiber post-core crowns.Methods Three-dimensional finite element models were created to simulate various residual crowns of two or three wall defects restored by different numbers and different parts of fiber post-core crowns. A static or dynamic load of 225 N was respectively applied vertically to the occlusal surface. The maximum principal stress and Von-mises peak stress of various parts of dentin were recorded under static and dynamic loads. Result In the case of residual crowns with two wall defects, the Von-mises peak stress reached the largest value under static and dynamic loads in the group without fiber post treatment, and the stress distribution was the most uniform in 2 fiber posts group and 3 fiber posts group. In case of mandibular molars with 3 wall defects under static load, the Von Mises peak stress of 3 fiber posts group was significantly smaller than the other two groups. ConclusionsOne fiber post was recommended to restore the residual crowns with two wall defect. In case of residual crowns with 3 walls defect, the number of fiber post should be increased to disperse stress and thus reduce the risk of tooth fracture.
Objective The purpose of this study was to analyze the stress magnitude and distribution of mandibular first molar with various residual crowns restored by different numbers of fiber post-core crowns.Methods Three-dimensional finite element models were created to simulate various residual crowns of two or three wall defects restored by different numbers and different parts of fiber post-core crowns. A static or dynamic load of 225 N was respectively applied vertically to the occlusal surface. The maximum principal stress and Von-mises peak stress of various parts of dentin were recorded under static and dynamic loads. Result In the case of residual crowns with two wall defects, the Von-mises peak stress reached the largest value under static and dynamic loads in the group without fiber post treatment, and the stress distribution was the most uniform in 2 fiber posts group and 3 fiber posts group. In case of mandibular molars with 3 wall defects under static load, the Von Mises peak stress of 3 fiber posts group was significantly smaller than the other two groups. ConclusionsOne fiber post was recommended to restore the residual crowns with two wall defect. In case of residual crowns with 3 walls defect, the number of fiber post should be increased to disperse stress and thus reduce the risk of tooth fracture.
引文
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3 Santos-Filho PC,Veríssimo C,Soares PV,et al.Influence of Ferrule,Post System,and Length on Biomechanical Behavior of Endodontically Treated Anterior Teeth.J Endod,2014,40(1):119-23.
4 Nam SH,Chang HS,Min KS,et al.Effect of the number of residual walls on fracture resistance,failure patterns,and photoelasticity of simulated premolars restored with or without fiber-reinforced composite posts.J Endod,2010,36(2):297-301.
5 Mangold JT,Kern M.Influence of glass-fiber posts on the fracture resistance and failure pattern of endodontically treated premolars with varying substance loss:an in vitro study.J Prosthet Dent,2011,105(6):387-393.
6 Sarkis-Onofre R,Jacinto Rde C,Boscato N,et al.Cast metal vs.glass fibre posts:A randomized controlled trial with up to 3 years of follow up.J Dent,2014,42(5):582-587.
7 Sorrentino R,Monticelli F,Goracci C,et al.Effect of post-retained composite restorations and amount of coronal residual structure on the fracture resistance of endodontically-treated teeth.Am J Dent,2007,20(4):269-274.
8 Arunpraditkul S,Saengsanon S,Pakviwat W.Fracture resistance of endodontically treated teeth:three walls versus four walls of remaining coronal tooth structure.J Prosthodont,2009,18(1):49-53.
9 刘峰.纤维桩修复技术.北京:人民卫生出版社,2012.
10 黄靖,汪俊.纤维树脂桩核系统修复牙根发育不完全牙后抗折强度的分析.口腔材料器械杂志,2015,24(2):88-92.
11 Al-Omiri MK,Rayyan MR,Abu-Hammad O.Stress analysis of endodontically treated teeth restored with post-retained crowns:A finite element analysis study.J Am Dent Assoc,2011,142(3):289-300.
12 Hou QQ,Gao YM,Sun L.Influence of fiber posts on the fracture resistance of endodontically treated premolars with different dental defects.Int J Oral Sci,2013,5(3):167-171.
13 Ferrari M,Cagidiaco MC,Grandini S,et al.Post placement affects survival of endodontically treated premolars.J Dent Res,2007,86(8):729-734.
2 Bru E,Forner L,Llena C,et al.Fibre post behaviour prediction factors.A review of the literature.J Clin Exp Dent,2013,5(3):150-153.
3 Santos-Filho PC,Veríssimo C,Soares PV,et al.Influence of Ferrule,Post System,and Length on Biomechanical Behavior of Endodontically Treated Anterior Teeth.J Endod,2014,40(1):119-23.
4 Nam SH,Chang HS,Min KS,et al.Effect of the number of residual walls on fracture resistance,failure patterns,and photoelasticity of simulated premolars restored with or without fiber-reinforced composite posts.J Endod,2010,36(2):297-301.
5 Mangold JT,Kern M.Influence of glass-fiber posts on the fracture resistance and failure pattern of endodontically treated premolars with varying substance loss:an in vitro study.J Prosthet Dent,2011,105(6):387-393.
6 Sarkis-Onofre R,Jacinto Rde C,Boscato N,et al.Cast metal vs.glass fibre posts:A randomized controlled trial with up to 3 years of follow up.J Dent,2014,42(5):582-587.
7 Sorrentino R,Monticelli F,Goracci C,et al.Effect of post-retained composite restorations and amount of coronal residual structure on the fracture resistance of endodontically-treated teeth.Am J Dent,2007,20(4):269-274.
8 Arunpraditkul S,Saengsanon S,Pakviwat W.Fracture resistance of endodontically treated teeth:three walls versus four walls of remaining coronal tooth structure.J Prosthodont,2009,18(1):49-53.
9 刘峰.纤维桩修复技术.北京:人民卫生出版社,2012.
10 黄靖,汪俊.纤维树脂桩核系统修复牙根发育不完全牙后抗折强度的分析.口腔材料器械杂志,2015,24(2):88-92.
11 Al-Omiri MK,Rayyan MR,Abu-Hammad O.Stress analysis of endodontically treated teeth restored with post-retained crowns:A finite element analysis study.J Am Dent Assoc,2011,142(3):289-300.
12 Hou QQ,Gao YM,Sun L.Influence of fiber posts on the fracture resistance of endodontically treated premolars with different dental defects.Int J Oral Sci,2013,5(3):167-171.
13 Ferrari M,Cagidiaco MC,Grandini S,et al.Post placement affects survival of endodontically treated premolars.J Dent Res,2007,86(8):729-734.