| Objectives The objective of this experiment is to use the three-dimension finite element analysis, by changing the platform design of implant platform width and with the same specifications of flush on inoculated implants using contrast, vertical and Bucco lingual method applied load, to compare the difference between the width of platform and platform switching implant design flat homogeneous docking design of implant in load stress, provide a reference for the further research of platform switching implant design and clinical choice.Methods 1.By using the finite element software ANSYS respectively draw three-dimensional geometric model of 3-D geometric models, including thread platform mandible bone block connected local conversion of implant, abutment and crown 3-D geometric model, including thread flush butt joint implant, abutment and crown. 2.Using the built finite element platform conversion model and homogeneous docking model, research on two kinds of connection methods effects on stress distribution of implant loading. 3.A three-dimensional finite element model of load were established respectively for different diameter implant, comparison in different platform width on the implant loads effect.Results 1.High precision were established, including the partial mandible bone, platform conversion implant containing a threaded connection, three-dimensional finite element model of the abutment and crown, and includes partial mandible bone, including threaded flush butt connection implants, three-dimensional finite element model of the abutment and crown. Implant shape and form close to the real implant osseointegration is complete, bone-implant contact surface is no relative friction.2, Respectively two models(PS, PM model) is applied to the vertical in ANSYS(with the long axis of the implant into the 0°) and buccolingual(with the long axis of the implant 45°) the size of 150 N. The two class of the stress distribution of the model is different.1)The largest model in the platform conversion Von-Mises stress concentration at the top of the implant abutment connection, the largest model in the butt flush Von-Mises stress concentration in implant- abutment interface with cortical bone contact area; 2)Two types of models in load, both in the neck of implant and the first thread showed significant stress distribution, the maximum Von-Mises stress of cortical bone ringed distribution around the neck of implant, the maximum Von-Mises stress of cancellous bone ringed distribution on implant root end, compression stress value is higher than the contralateral side; 3)Implant in the buccolingual load stress is higher than the vertical load of stress; 4)When subjected to loads, platform conversion model and implant abutments maximum Von-Mises stress is higher than the same diameter flush docking model, the maximum Von-Mises stress of cancellous bone and cortical bone area is flush with the butt bigger group; 5)The stress values showed a decreasing trend with the occurrence of implant diameter increases. 3.When in ANSYS platform transition model for stress load, the stress distribution consistent performance models in each group, 1)The maximum Von-Mises model stress concentration on the connecting position at the top of the implant and abutment; 2)All the models were in the neck of implant and the first thread showed significant stress distribution, the maximum Von-Mises stress of cortical bone ringed distribution around the neck of implant,the maximum Von-Mises stress of cancellous bone ringed distribution on implant root end, compression stress value is higher than the contralateral side; 3)Implant in the buccolingual load stress is higher than the vertical load of stress; 4)The stress values showed a decreasing trend with the occurrence of implant diameter increases.Conclusions 1.Platform switching model compared to flush the docking model, the bone tissues around the implant neck stress distribution more uniform, the value is lower. 2.Oblique load increased significantly compared to the vertical load stress around the implant, especially in parts of the abutment and the implant is more obvious. 3,With the increase of implant diameter, stress on the implant bone interface decreases. |
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