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[Effects of different tooth preparations on the fracture behavior of teeth with severe wedge-shaped defect restored with post and core crowns].[不同牙体预备方式对重度楔状缺损牙桩核冠修复后牙齿断裂行为的影响]
Hua Xi Kou Qiang Yi Xue Za Zhi. 2014 Apr;32(2):157-61. doi: 10.7518/hxkq.2014.02.012.
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J Prosthodont Res. 2014 Apr;58(2):92-101. doi: 10.1016/j.jpor.2014.03.001. Epub 2014 Apr 4.
3
Effects of post core materials on stress distribution in the restoration of mandibular second premolars: a finite element analysis.桩核材料对下颌第二前磨牙修复体应力分布的影响：有限元分析
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4
Stress amplifications in dental non-carious cervical lesions.牙非龋性颈领病变的应力放大。
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Effect of the crown, post, and remaining coronal dentin on the biomechanical behavior of endodontically treated maxillary central incisors.牙冠、桩核及剩余牙本质对上颌中切牙牙体牙髓治疗后生物力学行为的影响。
J Prosthet Dent. 2014 Mar;111(3):234-46. doi: 10.1016/j.prosdent.2013.07.006. Epub 2013 Nov 5.
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[Finite element contact stress analysis of simulating teeth with wedge-shaped defects in the cervical region].模拟颈部楔状缺损牙齿的有限元接触应力分析
Shanghai Kou Qiang Yi Xue. 2012 Aug;21(4):407-11.
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[Finite element stress analysis of all-ceramic crown of the upper central incisor in differential thickness].[上前牙全瓷冠不同厚度的有限元应力分析]
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Three-dimensional finite element analysis of molars with thin-walled prosthetic crowns made of various materials.不同材料薄壁修复体磨牙三维有限元分析
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Influence of Friction Resistance on Expression of Superelastic Properties of Initial NiTi Wires in "Reduced Friction" and Conventional Bracket Systems.摩擦阻力对初始镍钛丝在“低摩擦”和传统托槽系统中超弹性性能表达的影响。
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The prevalence of non-carious cervical lesions in permanent dentition.恒牙列中非龋性颈部病变的患病率。
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[不同方法修复深楔状缺损前磨牙的三维有限元分析]

[Three-dimensional finite element analyses of the deep wedge-shaped defective premolars restored with different methods].

作者信息

Ling Zhao, Liyuan Yang, Cuiling Liu, Xu Gao

机构信息

Dept. of Prosthodontics, School of Stomatology, Shandong University, Shandong Provincial Key Laboratory of Oral Tissue Regeneration, Jinan 250012, China.

Dept. of Stomatology, Qilu Hospital, Shandong University, Jinan 250012, China.

出版信息

Hua Xi Kou Qiang Yi Xue Za Zhi. 2017 Feb 1;35(1):77-81. doi: 10.7518/hxkq.2017.01.012.

DOI:10.7518/hxkq.2017.01.012
PMID:28326732
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7030200/
Abstract

OBJECTIVE

The objective of this paper is to analyze the stress distribution in the deep wedge-shaped defective mandibular first premolars restored with different methods.

METHODS

Three-dimensional finite element models of mandibular first premolar with deep wedge-shaped defect were created. The model, which was untreated after root canal treatment, served as the control group. Then, according to different treatment designs, four experimental groups were established as follows: resin filling (A), post restoration after resin filling (B), crown restoration after resin filling (C), and post and crown restoration after resin filling (D). Four different post materials were then chosen for establishing the subgroup models: fiber post (B1, D1), AuPd post (B2, D2), pure Ti post (B3, D3), and CoCr post (B4, D4). A force of 100 N was applied at a 30° angle on the buccal-inclined surface near the top of the buccal cusp. The maximum principal stress and Von Mises stress were investigated using finite element analysis software.

RESULTS

  1. For the control group, the maximum principal stress and Von Mises stress of the residual dentine were the same as those of the tip of the defect. 2) Compared with the control group, the maximum principal stress and Von Mises stress of groups A, B, C, and D decreased greatly (P<0.05). The maximum principal stress and Von Mises stress of groups C and D with crowns were similar. The maximum principal stress and Von Mises stress of the post-dentine surface of groups B and D with fiber post were less than those in the cast metal post models (P<0.05). 3) The displacement of the buccal cusp of group A was similar to that of the control group (P>0.05) and larger than those in groups B, C, and D (P<0.05).

CONCLUSIONS: It is necessary for deep wedge-shaped defective teeth to be treated with full crowns, but a post is not necessary. If a post is used, fiber post with elastic modulus closer to the dentine is more suitable than metal post.
.

摘要

目的

本文旨在分析采用不同方法修复的下颌第一前磨牙深楔状缺损中的应力分布情况。

方法

创建下颌第一前磨牙深楔状缺损的三维有限元模型。根管治疗后未作处理的模型作为对照组。然后，根据不同的治疗设计，设立如下四个实验组：树脂充填（A组）、树脂充填后桩修复（B组）、树脂充填后全冠修复（C组）以及树脂充填后桩核冠修复（D组）。接着选择四种不同的桩材料建立亚组模型：纤维桩（B1、D1）、金钯合金桩（B2、D2）、纯钛桩（B3、D3）和钴铬合金桩（B4、D4）。在靠近颊尖顶部的颊侧倾斜面上以30°角施加100 N的力。使用有限元分析软件研究最大主应力和冯·米塞斯应力。

结果

1）对照组中，剩余牙本质的最大主应力和冯·米塞斯应力与缺损尖端的应力相同。2）与对照组相比，A、B、C、D组的最大主应力和冯·米塞斯应力均显著降低（P<0.05）。C组和D组采用全冠修复后的最大主应力和冯·米塞斯应力相似。B组和D组采用纤维桩的桩周牙本质表面的最大主应力和冯·米塞斯应力小于铸造金属桩模型（P<0.05）。3）A组颊尖的位移与对照组相似（P>0.05），且大于B、C、D组（P<0.05）。

结论

下颌第一前磨牙深楔状缺损牙采用全冠修复是必要的，但桩并非必需。若使用桩，弹性模量更接近牙本质的纤维桩比金属桩更合适。