| Objective: The purpose of this study is to establish a three-dimensional finite element model for micro-implant-bone and to analyze the influence of different direction of force and different height of thread on the biomechanical characteristics of micro-implant-bone interface.Method: Using the commercial code of SOLIDWORKS and ANSYSworkbench software,the three-dimensional finite element models of micro-implant-bone complex were built up to analyze the influence of different direction of force and different height of thread on the biomechanical characteristics of micro-implant-bone interface.Result: A simulated orthodontic force which was 150 grams with five directions was applied to the head of micro-implant,that is, referring to the axis of micro-implant and starting from the head of micro-implant 0 degree,30 degree,45 degree,60 degree and 90 degree. On all the conditions, the Von-Mises and the displacement were focused on the cervix of the micro-implant. The Von-Mises and the displacement were very small. As the angle increased ,the maximum Von-Miser stress at the cervix of the implants were 0.612Mpa,3.118Mpa,4.103Mpa,4.809Mpa,5.159Mpa. the maximum displacement at the cervix of the implants were0.695μm,0.126μm,0.137μm,0.142μm,0.158μm .Using ANSYSworkbench the three-dimensional finite element modeling of the micro-implants-bone complexs were established by put the height of threaded implant as (0.1mm,0.15mm,0.2mm,0.25mm,0.3mm,0.35mm). On all the conditions , the Von-Mises and the displacement were focused on the cervix of the micro-implant.The Von-Mises and the displacement were very small. As the height of thread increased,the maximum Von-Miser stress at the cervix of the implants were 4.988Mpa,5.075Mpa,4.809Mpa,5.399Mpa,5.428Mpa,6.271Mpa, the maximum displacement at the cervix of the implants were 0.157μm,0.154μm,0.142μm,0.147μm,0.153μm,0.167μm .The height of the threaded implant as 0.2mm has the minimum stress and displacement.Conclusion: On all the conditions,the maximum Von-Miser stress and the maximum displacement were focused on the cervix of the micro-implant The Von-Mises stress and the displacement were mainly focused on the cortical bone.The maximum Von-Miser stress and the displacement were very small. The micro-implant can safely loaded with 150g force in different directions, especially the one in smaller angle. Different height of thread can have influence on the Von-Mises stress and the displacement on the cervix of the micro-implant .The height of threaded implant as 0.2mm has the minimum stress and displacement. |
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