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KMID : 1004520100260020205
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Journal of Dental Rehabilitation and Applied Science
2010 Volume.26 No. 2 p.205 ~ p.220
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Effect of Implant Designs on Insertion Torque and Stress : Three-Dimensional Finite Element Analysis
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Kim Jang-Eung
Choi Yu-Sung
Lim Jong-Hwa
Cho In-Ho
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Abstract
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Purpose: To analyze the effect of implant designs on insertion torque and stress by performing a comparative study on von Mises stress, torque and normal force through a three-dimensional finite element analysis.
Materials and Methods : Models of the screw type implant were used to model the implant as a form placed in the mandibular premolar region applying a three-dimensional finite element method. Screw type implant designs were classified into 4 types of parallel ones and 7 types of tapered ones. Other factors were simulated to represent clinical environment.
Results: In parallel implant designs, higher and wider threads resulted in higher insertion torques and higher stress distributions. In tapered implant designs, changes in the taper led to remarkable differences in the insertion torques. It was difficult to determine a certain tendency of stress distribution around the implants since the stress level was too high around them. In tapered implant designs, smaller implants demonstrated lower insertion torques than the original type and were relatively less dependent on the degree of taper. Tapered implants showed higher insertion torques and higher stress distributions than parallel implants.
Conclusion: According to this study, although the tapered implant demonstrated a higher insertion torque than the parallel implant, stress tended to be concentrated in the entire fixture of the tapered implant due to the inefficient stress distribution.
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KEYWORD
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Finite element analysis, Implant design, Insertion torque, Stress distribution, Screw type implant
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