Analyses Of The Biomechanical Characteristics Of β Ti Alloy Orthodontic Mini-implant Using Three Dimensional Finite Element Method

Implant anchorage take jaw as the directly bear position of orthodontic force which can satisfy the anchorage requirements in treatments. The stability of implant anchorage is closely related to the compatibility of biomechanics. The laster research shows thatβtitanium alloy with low elastic modulus is more closer with elastic modulus of bone structure and that exists more selections for implant material with the research of biomechanical compatibility. As an effective means of study biomechanics, three dimensional finite element method has been widely applied in mechanics research about related aspects of orthodontic anchorage implant.The purpose of this article is to study the implant-bone interfacial stress distribution of orthodontic implant anchorage composed of low elastic modulusβtitanium alloy with three dimensional finite element method, which used the software such as Pro/E and Ansys Workbench etc. Compared with conventional titanium implant and due to the difference of jaw structure of patients, different condition select different sizes implant, the research results are as fellows:1. Apply the adaptive assembly function of Pro/E and the parameters two-way transfer function between Ansys Workbench and Pro/E, creat three dimensional finite element model that include the orthodontic implant anchorage and local section of posterior mandible. Compared with early modeling mothods, this method not only increases the scalability of the model, but also improve the efficiency of the modeling,it provided a technical platform for further analysis different material biomechanics property of orthodontic implant anchorage.2. Using three dimensional finite element mothod, analysis the implant biomechanics property between two kind of elastic modulus, the result show that:(1) Low elastic modulusβtitanium alloy orthodontic implant anchorage objective function possess simular change trends with high elastic modulusβtitanium alloy.(2)with the increasing of diameter,both two kind of material titanium alloy implant Objective function show decreasing trend.(3) Low elastic modulusβtitanium alloy orthodontic implant anchorage and high elastic modulusβtitanium alloy show simular change trend in cortical bone EQV stress peak, cancellous bone EQV stress peak and implant displacement peak.(4) Under the length in the range of 6.5-9.5 mm conditions, with the length increasing, the stress distribution becomes more uniform, the implant more stable. When the diameter is constant, the length less than or equal 6.5mm or greater than 10mm, stress distribution show increaing trend.(5) The orthodontic implant anchorage objective function absolute value of low elastic modulusβtitanium alloy is greater than high elastic modulusβtitanium alloy.The future applicati on cf the low elastic modulusβ-Ti alloy which has good biological compatibility needs further in vitro experiments and zoopery.