J Korean Assoc Oral Maxillofac Surg 2018; 44(2): 59~65
Three-dimensional optimization and sensitivity analysis of dental implant thread parameters using finite element analysis
Maryam Geramizadeh1, Hamidreza Katoozian1, Reza Amid2, Mahdi Kadkhodazadeh2
1Department of Biomechanical Engineering, Amirkabir University,
2Dental Research Center, Research Institute of Dental Sciences, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Mahdi Kadkhodazadeh
Dental Research Center, Research Institute of Dental Sciences, Dental School, Shahid Beheshti University of Medical Sciences, 7th Floor, Bldg. No. 2 SBUMS, Arabi Ave., Daneshjoo Blvd., Velenjak, Tehran 19839-63113, Iran
TEL: +98-21-22190224, 912 7608346 FAX: +98-21-22190224
E-mail: Kadkhodazadehmahdi@yahoo.com
ORCID: http://orcid.org/0000-0002-6131-2791
Received August 21, 2017; Revised October 29, 2017; Accepted November 20, 2017.; Published online April 30, 2018.
© Korean Association of Oral and Maxillofacial Surgeons. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Objectives: This study aimed to optimize the thread depth and pitch of a recently designed dental implant to provide uniform stress distribution by means of a response surface optimization method available in finite element (FE) software. The sensitivity of simulation to different mechanical parameters was also evaluated.
Materials and Methods: A three-dimensional model of a tapered dental implant with micro-threads in the upper area and V-shaped threads in the rest of the body was modeled and analyzed using finite element analysis (FEA). An axial load of 100 N was applied to the top of the implants. The model was optimized for thread depth and pitch to determine the optimal stress distribution. In this analysis, micro-threads had 0.25 to 0.3 mm depth and 0.27 to 0.33 mm pitch, and V-shaped threads had 0.405 to 0.495 mm depth and 0.66 to 0.8 mm pitch.
Results: The optimized depth and pitch were 0.307 and 0.286 mm for micro-threads and 0.405 and 0.808 mm for V-shaped threads, respectively. In this design, the most effective parameters on stress distribution were the depth and pitch of the micro-threads based on sensitivity analysis results.
Conclusion: Based on the results of this study, the optimal implant design has micro-threads with 0.307 and 0.286 mm depth and pitch, respectively, in the upper area and V-shaped threads with 0.405 and 0.808 mm depth and pitch in the rest of the body. These results indicate that micro-thread parameters have a greater effect on stress and strain values.
Keywords: Dental implants, Thread design, Optimization, Biomechanics, Finite element
Fig. 1. Consideration of stress and strain quantities to find the best points to minimize both (green zone).

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