以有限元素法分析矯正用骨釘應力分布狀態

Stress distribution analysis of orthodontic implant with finite element method

陳俊伊(Chun I Chen)

指導教授 ： 鄭信忠

共同指導教授 ： 歐耿良

臺北醫學大學/口腔醫學院/牙醫學系碩博士班/碩士(2011年)

摘要

無資料

關鍵字

齒顎矯正 ； 錨定 ； 暫時性錨定裝置 ； 田口品質工程 ； 應力

並列摘要

Purpose
Orthodontic implant has been used for temporary anchorage for orthodontic treatment.The stress states of loaded orthodontic implant–bone interfaces is related to success of orthodontic implant. Stress distribution were analyzed by finite element method(FEM), and determined the difference in the stress distribution for different thread design and different implant placement angle to identify risk factors for the loosening of orthodontic mini-implants.
Methods
The Taguchi method was employed to find out the significance of each thread design factor to affect bone stress. Using the computer program(ANSYS) to build up three-dimensional finite element models alveolar bone(cortical bone 2 mm thick) and orthodontic mini-implants(Ti-6Al-4V) corresponding to the Taguchi L9 array. Horizontal force(150 CN) was applied ; stimulation time was 1 second.
We calculated the most equivalent stresses(Von Mises) on the bone elements and evaluated stress distribution according to implantation direction (0, 15, 30, 45, 60, 75 degree) and three different kind of orthodontic implant : self-design orthodontic implant corresponding to the Taguchi L9 array result, AbsoanchorR (Dentos, Daegu, Korea), LOMASR (Mondeal Medical System GmbH，Tuttlingen, Germany).
Results
Equivalent stress on the cortical bone ranged from 1.30 to 4.69 MPa and on the cancellous bone anged from 0.10 to 0.17 MPa depending on the implantation direction. The stress distribution on the surrounding bone of implant placement angle 0 degree was even and small. Bone surrounding stress is small in self-design orthodontic implant corresponding to the Taguchi L9 array result.
Conclusions
This report suggests information for clinicians to understand the stress distribution on alveolar bone with different placement direction. Implant thread design is also one the factors to facilitate implant stability in clinical treatmentz

並列關鍵字

orthodontic treatment ； anchorage ； temporary anchorage device ； Taguchi method ； stress

參考文獻

7. Lao LC. Anchorage – Literature review. J Taiwan Asso Orthod

and stability of anodized mini-screw in animal study. J Taiwan

3. Jason B. Cope. OrthoTADs : The Clinical Guide and Atlas. 1-20

4. Jason B. Cope. Temporary anchorage devices in orthodontis : A paradigm shift. 101-123.

orthodontics 194-196.