Three-dimensional finite element analysis of stress in the bending root of maxillary first molar

doi:10.3969/j.issn.2095-4344.2013.33.008

Abstract

Abstract:

BACKGROUND: The stress distribution in the periodontal ligament of bending root can provide reference for the size and manner of force in orthodontic treatment. On this account, it can optimize the design of orthodontic force.
OBJECTIVE: To analyze the stress distribution of root and periodontal ligament in the bending roots of the maxillary first molar under different orthodontic forces.
METHODS: The maxillary first molars with normal roots and bending roots were selected, and then the finite element models of maxillary first molars and periodontal ligaments were established through CT scan and Workbench 11.0 finite element analysis software. The models were loaded with six different methods to analyze the stress distribution.
RESULTS AND CONCLUSION: The stress distribution of bending root was mainly concentrated in the tooth neck, followed by the apex. During the overall tooth movement, the stress was smallest on the root, periodontal ligament and alveolar bone. Correction of bending roots needs more accurate positioning and traction.

Key words: tissue construction, oral tissue construction, oral finite element analysis, maxillary, first molar, bending root, biological tissue, stress, biomechanics, periodontal ligament

CLC Number:

R318

Peng Hui, Zhang Ying, Wang Hong-yan. Three-dimensional finite element analysis of stress in the bending root of maxillary first molar[J]. Chinese Journal of Tissue Engineering Research, doi: 10.3969/j.issn.2095-4344.2013.33.008.

Figures/Tables 6

表2结果显示，弯曲牙根垂直方向加载：牙合向与龈向相比，牙体位移，牙根等效应力，牙周膜等效应力差异无显著性意义(P > 0.05)；牙合向加载时，其最大拉应力明显大于龈向加载，其最大压应力明显小于龈向加载，且差异有显著性意义(P < 0.05)。弯曲牙根水平方向加载：舌向与颊向相比，牙体位移，牙根等效应力，牙周膜等效应力，最大拉应力差异无显著性意义(P > 0.05)，远中向牙体位移，牙根等效应力，牙周膜等效应力，最大拉应力明显大于颊向，且差异有显著性意义(P < 0.05)，远中向与近中向相比，牙体位移，牙根等效应力，牙周膜等效应力，最大拉应力差异无显著性意义(P > 0.05)。舌向加载时，牙根的最大压应力与远中向相比无明显差别，与近中向相比差异也无显著性意义(P > 0.05)，颊向加载时牙根的最大压应力明显大于舌向加载，且差异有显著性意义(P < 0.05)。 2.2 正常牙根受力情况正常牙根在不同方向的受力情况下，牙体位移，牙根、牙周膜的应力分布情况，见图6，表3。表3结果显示，正常牙根垂直方向加载：牙合向与龈向相比，牙体位移，牙根等效应力，牙周膜等效应力差异无显著性意义(P > 0.05)；牙合向加载时，其最大拉应力明显大于龈向加载，其最大压应力明显小于龈向加载，且差异有显著性意义(P < 0.05)。正常牙根水平方向加载：舌向与颊向相比，牙体位移，牙根等效应力，牙周膜等效应力差异无显著性意义(P > 0.05)，远中向牙体位移，牙根等效应力，牙周膜等效应力明显大于颊向，且差异有显著性意义(P < 0.05)，远中向与近中向相比，牙体位移，牙根等效应力，牙周膜等效应力差异无显著性意义(P > 0.05)。牙根的最大压应力为颊向与远中向相比差异无显著性意义(P > 0.05)，颊向明显大于舌向，颊向明显小于近中向，且差异有显著性意义(P < 0.05)，最大压应力情况为，颊向与近中向比较，差异无显著性意义(P > 0.05)，舌向明显大于颊向，舌向明显小于远中向，差异有显著性意义(P < 0.05)。"

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