Int J Stomatol

Int J Stomatol ›› 2019, Vol. 46 ›› Issue (4): 387-392.doi: 10.7518/gjkq.2019070

• Original Articles • Previous Articles     Next Articles

3D finite element analysis for influence of microimplant thread depth on microimplant and mandible

Yan Dan1,Zhang Xizhong2,Wang Jianguo2()   

  1. 1. Dept. of Tongji West Clinic, Foshan Stomatological Hospital, School of Stomatology and Medicine, Foshan University, Foshan 528000, China
    2. Dept. of Orthodontics, Tianjin Stomatological Hospital, Tianjin 300041, China
  • Received:2018-08-18 Revised:2019-02-15 Online:2019-07-01 Published:2019-07-12
  • Supported by:
    This study was supported by Foshan Medical Science and Technology Board(2017AB001881);Medical Research of Foshan Health and Family Planning Bureau(20180158)

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Abstract:

Objective In this work, we aimed to analyse the influence of microimplant thread depth on stress and displacement distribution on microimplant and mandible and apply the theoretical reference in choosing orthodontic anchorage microimplant and optimising its design.Methods The 3D finite element models of the microimplants with different thread depths and mandibles were established using Pro/E. The elements were divided using Hypermesh, and results were calculated using the ANSYS software. The force of 2.94 N which was parallel to the mandible surface was applied on the top of the microimplant.Results The maximum Von-mises stress on the microimplant-bone interface focused on the cortical bone. The model with thread depth of 0.3 mm had the smallest Von-mises stress peak of 18.12 MPa on the microimplant neck and its nearby bone, whereas the largest Von-mises stress peak of 60.28 MPa occurred in the model with the thread depth of 0.4 mm.Conclusion The microimplant thread depth influenced the stress distribution on the microimplant and mandible. The stress and displacement distributions on microimplant-bone interface and microimplant were at the optimum when the tread depth was 0.3 mm among all the cases mentioned in this work.

Key words: finite element analysis, stress, orthodontic anchorages, microimplant, thread depth

CLC Number: 

  • R783.5

TrendMD: 

Tab 1

The element number and node number of micro-implant-bone models"

模型序号 网格总数 节点总数
De-1 50 984 11 910
De-2 44 678 10 566
De-3 42 588 10 050
De-4 57 518 13 603

Tab 2

Mechanical properties of the expertment material"

材料名称 弹性模量/MPa 泊松比
骨密质 13 700 0.3
骨松质 1 370 0.3
微种植体 103 400 0.35

Fig 1

Boundary and load conditions"

Fig 2

Von-mises stress curve line on the micro-implant-bone interface"

Fig 3

The displancement curve line on the micro-implant-bone interface"

Tab 3

The peak Von-mises stress on micro-implant-bone interface Mpa"

模型序号 压力侧 非压力侧 平均值
De-1 22.61 35.81 29.21
De-2 39.43 63.10 51.27
De-3 41.36 43.01 42.19
De-4 52.80 98.97 75.89

Tab 4

The peak displacement on micro-implant-bone interface mm"

模型序号 压力侧 非压力侧
De-1 0.004 46 0.004 54
De-2 0.004 79 0.004 69
De-3 0.003 36 0.003 46
De-4 0.006 06 0.004 63

Fig 4

The Von-mises stress distribution on the longitudinal section of the modelsA：De-1;B：De-2;C：De-3;D：De-4。"

Fig 5

The curve line of Von-mises stress along z axis"

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