纤维桩和金属桩全冠修复后下颌第一磨牙残根的有限元应力分析
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摘要
目的分析经金属桩和纤维桩全冠修复后下颌第一磨牙残根在静态及动态载荷下,剩余牙体组织应力分布形式和应力大小。方法利用有限元法分别建立下颌第一磨牙残根纤维桩核冠和金属桩核冠修复的模型,静态载荷为在牙冠表面施加与牙体长轴一致的225N的压力,动态载荷为225N的半正弦脉冲,历时1ms。记录2种载荷下各部位牙本质von Mises应力最大值以及最终时刻的牙本质von Mises应力。结果 2种载荷下,2种桩核系统修复后牙本质最大Von Mises应力都位于牙本质颈部近舌侧。动态载荷下,牙本质最大Von Mises应力超过100Mpa。2种载荷下,纤维桩修复后牙本质各部位的Von Mises应力基本都略小于金属桩修复。动态载荷下,根分歧区的应力明显增大,显著高于其他部位。结论动态载荷下颈部的应力值大于牙本质的抗折强度。金属桩修复的牙本质应力普遍大于纤维桩,纤维桩能较好地分散应力,可以考虑作为后牙残根的一种较好的修复方式。
Objective To analyze the stress magnitude and distribution of residual dentin in maxillary first molar restored with fiber post and casting post under static and dynamic loads using three-dimension finite element methods. Methods A mandibular first molar model with residual root restored with fiber post and casting post was established by the three-dimensional finite element method. A static load force of 225 N and a half sine pulse force of 225 N lasting 1ms was respectively applied vertically to the occlusal surface of dental crown. The maximum von Mises stress and the last von Mises stress of various parts in tooth was respectively recorded under static and dynamic load status. Results Under static and dynamic conditions, the maximum Von Mises stresses of mandibular molarrepaired by two post systems were concentrated at the lingual cervical. Under dynamic loads, the maximum Von Mises stress exceeded 100 Mpa. Under both loading conditions, the Von Mises stress of various parts in mandibular molar restored with the fiber post was slightly less than that of tooth restored with the metal posts. Under dynamic loading, the stress significantly increased in furcation area, significantly higher than other parts. Conclusion Stress value under dynamic condition was greater than the bending strength of dentine. The stress of dentin after metal post restoration were generally greater than that of dentin after fiber post restoration, suggestingfiber posts could better distribute the stress,which can be considered as a good way to dental restoration.
Objective To analyze the stress magnitude and distribution of residual dentin in maxillary first molar restored with fiber post and casting post under static and dynamic loads using three-dimension finite element methods. Methods A mandibular first molar model with residual root restored with fiber post and casting post was established by the three-dimensional finite element method. A static load force of 225 N and a half sine pulse force of 225 N lasting 1ms was respectively applied vertically to the occlusal surface of dental crown. The maximum von Mises stress and the last von Mises stress of various parts in tooth was respectively recorded under static and dynamic load status. Results Under static and dynamic conditions, the maximum Von Mises stresses of mandibular molarrepaired by two post systems were concentrated at the lingual cervical. Under dynamic loads, the maximum Von Mises stress exceeded 100 Mpa. Under both loading conditions, the Von Mises stress of various parts in mandibular molar restored with the fiber post was slightly less than that of tooth restored with the metal posts. Under dynamic loading, the stress significantly increased in furcation area, significantly higher than other parts. Conclusion Stress value under dynamic condition was greater than the bending strength of dentine. The stress of dentin after metal post restoration were generally greater than that of dentin after fiber post restoration, suggestingfiber posts could better distribute the stress,which can be considered as a good way to dental restoration.
引文
1马洪学,申丽丽,刘琨,等.玻璃纤维桩核与铸造金属桩核修复残根残冠及无桩修复牙体的临床效果评价.华西口腔医学杂志,2013,2(1):45-48.
2 刘畅,薛莉,张玉.纤维桩修复严重缺损后牙的临床疗效评价.国际口腔医学杂志,2013,1(40):24-27.
3 许珏,李钧,张姝.纤维桩和金属铸造桩修复疗效的回顾性比较.口腔材料器械杂志,2013,22(2):110-112.
4 Zhang Y,Ayiguli A,Li Q,et al.The influence of ferrule effect on post-restored restoration using extended finite element method.Zhonghua Kou Qiang Yi Xue Za Zhi.2014;49(6):357-361.
5 Garbin CA,Spazzin AO,Meira-Jiinior AD,et al.Biomechanical behaviour of a fractured maxillary incisor restored wilh direct composite resin only or with different post systems.Int Endod J,2010,43(12):1098-1107.
6 Eraslan O,Eskitascioglu G.Conservative restoration of severely damaged endodontically treated premolar teeth:a FEM study.Clin Oral Investig,2011,15(3):403-408.
7 王惠芸.我国人牙的测量和统计.中华口腔科杂志,1959,3(2):149-150.
8 Imanishi A,Nakamura T,Ohyama T,et al.3-D finite element analysis of all-ceramic posterior crowns.J Oral Rehabil,2003,30(8):818-822.
9 Dejak B,Mlotkowski A.Finite element analysis of strength and adhesion of cast posts compared to glass fiber-reinforced composite resin posts in anterior teeth.J Prosthet Dent,2011,105(2):115-126.
10 Salameh Z,Sorrentino R,Ounsi HF,et al.The effect of different full-coverage crown systems on fracture resistance and failure pattern of endodontically treated maxillary incisors restored with and without glass fiber posts.J Endod,2008,34(7):842-846.
11 Plotino G,Grand NM,Bedini R,et al.Flexural properties of endodontic posts and human root dentin.Dent Mater,2007,23(9):1129-1135.
12 Mahmoudi M,Saidi A,Gandjakhan Nassab SA,et al.A threedimensional finite element analysis of the effects of restorative materials and post geometry on stress distribution in mandibular molar tooth restored with post-core crown.Dent Mater J,2012,31(2):171-179.
13 许琳,朱文军,程绍华,等。纤维桩对复合树脂修复根管治疗后磨牙影响的有限元研究.中华口腔医学研究杂志(电子版),2014,8(1):18-22.
14 Nie EM,Chen XY,Zhang CY,et al.Influence of masticatory fatigue on the fracture resistance of the pulpless teeth restored with quartz-fiber post-core and crown.Int J Oral Sci,2012,4(4):218-220.
15 Sherfudhin H,Hobeich J,Carvalho CA,et al.Effect of different ferrule designs on the fracture resistance and failure pattern of endodontically treated teeth restored with fiber posts and allceramic crowns.J Appl Oral Sci,2011,19(1):28-33.
16 蔡惠,陈蕾,熊瑛.纤维桩表面处理对其修复后牙根抗折裂强度的影响.华西口腔医学杂志,2012,30(4):371-373.
17 Pereira JR,Valle AL,Shiratori FK,et al.Influence of intraradicular post and crown ferrule on the fracture strength of endodontically treated teeth.Braz Dent J,2009,20(4):297-302.
18 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.
19 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.
2 刘畅,薛莉,张玉.纤维桩修复严重缺损后牙的临床疗效评价.国际口腔医学杂志,2013,1(40):24-27.
3 许珏,李钧,张姝.纤维桩和金属铸造桩修复疗效的回顾性比较.口腔材料器械杂志,2013,22(2):110-112.
4 Zhang Y,Ayiguli A,Li Q,et al.The influence of ferrule effect on post-restored restoration using extended finite element method.Zhonghua Kou Qiang Yi Xue Za Zhi.2014;49(6):357-361.
5 Garbin CA,Spazzin AO,Meira-Jiinior AD,et al.Biomechanical behaviour of a fractured maxillary incisor restored wilh direct composite resin only or with different post systems.Int Endod J,2010,43(12):1098-1107.
6 Eraslan O,Eskitascioglu G.Conservative restoration of severely damaged endodontically treated premolar teeth:a FEM study.Clin Oral Investig,2011,15(3):403-408.
7 王惠芸.我国人牙的测量和统计.中华口腔科杂志,1959,3(2):149-150.
8 Imanishi A,Nakamura T,Ohyama T,et al.3-D finite element analysis of all-ceramic posterior crowns.J Oral Rehabil,2003,30(8):818-822.
9 Dejak B,Mlotkowski A.Finite element analysis of strength and adhesion of cast posts compared to glass fiber-reinforced composite resin posts in anterior teeth.J Prosthet Dent,2011,105(2):115-126.
10 Salameh Z,Sorrentino R,Ounsi HF,et al.The effect of different full-coverage crown systems on fracture resistance and failure pattern of endodontically treated maxillary incisors restored with and without glass fiber posts.J Endod,2008,34(7):842-846.
11 Plotino G,Grand NM,Bedini R,et al.Flexural properties of endodontic posts and human root dentin.Dent Mater,2007,23(9):1129-1135.
12 Mahmoudi M,Saidi A,Gandjakhan Nassab SA,et al.A threedimensional finite element analysis of the effects of restorative materials and post geometry on stress distribution in mandibular molar tooth restored with post-core crown.Dent Mater J,2012,31(2):171-179.
13 许琳,朱文军,程绍华,等。纤维桩对复合树脂修复根管治疗后磨牙影响的有限元研究.中华口腔医学研究杂志(电子版),2014,8(1):18-22.
14 Nie EM,Chen XY,Zhang CY,et al.Influence of masticatory fatigue on the fracture resistance of the pulpless teeth restored with quartz-fiber post-core and crown.Int J Oral Sci,2012,4(4):218-220.
15 Sherfudhin H,Hobeich J,Carvalho CA,et al.Effect of different ferrule designs on the fracture resistance and failure pattern of endodontically treated teeth restored with fiber posts and allceramic crowns.J Appl Oral Sci,2011,19(1):28-33.
16 蔡惠,陈蕾,熊瑛.纤维桩表面处理对其修复后牙根抗折裂强度的影响.华西口腔医学杂志,2012,30(4):371-373.
17 Pereira JR,Valle AL,Shiratori FK,et al.Influence of intraradicular post and crown ferrule on the fracture strength of endodontically treated teeth.Braz Dent J,2009,20(4):297-302.
18 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.
19 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.