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http://dx.doi.org/10.4041/kjod.2011.41.1.25

Optimization of orthodontic microimplant thread design  

Kim, Kwang-Duk (Department of Orthodontics, School of Dentistry, Kyungpook National University)
Yu, Won-Jae (Department of Orthodontics, School of Dentistry, Kyungpook National University)
Park, Hyo-Sang (Department of Orthodontics, School of Dentistry, Kyungpook National University)
Kyung, Hee-Moon (Department of Orthodontics, School of Dentistry, Kyungpook National University)
Kwon, Oh-Won (Department of Orthodontics, School of Dentistry, Kyungpook National University)
Publication Information
The korean journal of orthodontics / v.41, no.1, 2011 , pp. 25-35 More about this Journal
Abstract
Objective: The purpose of this study was to optimize the thread pattern of orthodontic microimplants. Methods: In search of an optimal thread for orthodontic microimplants, an objective function stability quotient (SQ) was built and solved which will help increase the stability and torsional strength of microimplants while reducing the bone damage during insertion. Selecting the AbsoAnchor SH1312-7 microimplant (Dentos Inc., Daegu, Korea) as a control, and using the thread height (h) and pitch (p) as design parameters, new thread designs with optimal combination of hand p combination were developed. Design soundness of the new threads were examined through insertion strain analyses using 3D finite element simulation, torque test, and clinical test. Results: Solving the function SQ, four new models with optimized thread designs were developed (h200p6, h225p7, h250p8, and h275p8). Finite element analysis has shown that these new designs may cause less bone damage during insertion. The torsional strength of two models h200p6 and h225p7 were significantly higher than the control. On the other hand, clinical test of models h200p6 and h250p8 had similar success rates when compared to the control. Conclusion: Overall, the new thread designs exhibited better performance than the control which indicated that the optimization methodology may be a useful tool when designing orthodontic microimplant threads.
Keywords
Orthodontic microimplant; Thread; Design optimization; Insertion strain; Finite element analysis; Torsional strength;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
Times Cited By Web Of Science : 1  (Related Records In Web of Science)
Times Cited By SCOPUS : 2
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1 Uhthoff HK. Mechanical factors influencing the holding power of screws in compact bone. J Bone Joint Surg Br 1973;55:633-9.
2 Motoyoshi M, Hirabayashi M, Uemura M, Shimizu N. Recommended placement torque when tightening an orthodontic mini-implant. Clin Oral Implants Res 2006;17:109-14.   DOI   ScienceOn
3 BUchter A, Wiechmann D, Koerdt S, Wiesmann HP, Piffko J, Meyer U. Load-related implant reaction of mini-implants used for orthodontic anchorage. Clin Oral Implants Res 2005;16:473-9.   DOI   ScienceOn
4 Park HS. Orthodontic treatment using micro-implant: clinical applications of micro-implant anchorage. Seoul: DaehanNare Publishing; 2006. p. 5-33.
5 Meredith N. Assessment of implant stability as a prognostic determinant. Int J Prosthodont 1998;11:491-501.
6 Ramaswamy R, Evans S, Kosashvili Y. Holding power of variable pitch screws in osteoporotic, osteopenic and normal bone: are all screws created equal? Injury 2010;41:179-83.   DOI   ScienceOn
7 Saka B. Mechanical and biomechanical measurements of five currently available osteosynthesis systems of self-tapping screws. Br J Oral Maxillofac Surg 2000;38:70-5.   DOI   ScienceOn
8 Miyawaki S, Koyama I, Inoue M, Mishima K, Sugahara T, Takano-Yamamoto T. Factors associated with the stability of titanium screws placed in the posterior region for orthodontic anchorage. Am J Orthod Dentofacial Orthop 2003;124:373-8.   DOI   ScienceOn
9 Ludwig B, Baumgaertel S, Bowman SJ. Mini-implants in orthodontics. Innovative anchorage concepts. 1st ed. London: Quintessence Publishing; 2008. p. 23.
10 Miyamoto I, Tsuboi Y, Wada E, Suwa H, Iizuka T. Influence of cortical bone thickness and implant length on implant stability at the time of surgery-clinical, prospective, biomechanical, and imaging study. Bone 2005;37:776-80.   DOI   ScienceOn
11 Song YY, Cha JY, Hwang CJ. Evaluation of insertion torque and pull-out strength of mini-screws according to different thickness of artificial cortical bone. Korean J Orthod 2007;37:5-15.
12 Park HS, Jeong SH, Kwon OW. Factors affecting the clinical success of screw implants used as orthodontic anchorage. Am J Orthod Dentofacial Orthop 2006;130:18-25.   DOI   ScienceOn
13 Chen Y, Kyung HM, Zhao WT, Yu WJ. Critical factors for the success of orthodontic mini-implants: a systematic review. Am J Orthod Dentofacial Orthop 2009;135:284-91.   DOI   ScienceOn
14 Song YY, Cha JY, Hwang CJ. Mechanical characteristics of various orthodontic mini-screws in relation to artificial cortical bone thickness. Angle Orthod 2007;77:979-85.   DOI   ScienceOn
15 Hwang CJ, Choi BJ, Kim KN, Kim KM, Lee YK. Orthodontic materials and clinical technique. Seoul: DaehanNare Publishing; 2003. p. 24.
16 Motoyoshi M, Yano S, Tsuruoka T, Shimizu N. Biomechanical effect of abutment on stability of orthodontic mini-implant. A finite element analysis. Clin Oral Implants Res 2005;16:480-5.   DOI   ScienceOn
17 You ZH, Bell WH, Schneiderman ED, Ashman RB. Biomechanical properties of small bone screws. J Oral Maxillofac Surg 1994;52:1293-302.   DOI   ScienceOn
18 Kincaid B, Schroder L, Mason J. Measurement of orthopedic cortical bone screw insertion performance in cadaver bone and model materials. Experimental Mechanics 2007;47:595-607.   DOI   ScienceOn
19 Krenn MH, Piotrowski WP, Penzkofer R, Augat P. Influence of thread design on pedicle screw fixation. Laboratory investigation. J Neurosurg Spine 2008;9:90-5.   DOI   ScienceOn
20 Brinley CL, Behrents R, Kim KB, Condoor S, Kyung HM, Buschang PH. Pitch and longitudinal fluting effects on the primary stability of miniscrew implants. Angle Orthod 2009;79:1156-61.   DOI   ScienceOn
21 Yu WJ, Kyung HM. Torque and mechanical failure of orthodontic micro-implant influenced by implant design parameters. Korean J Orthod 2007;37:171-81.
22 Chun HJ, Cheong SY, Han JH, Heo SJ, Chung JP, Rhyu IC, et al. Evaluation of design parameters of osseointegrated dental implants using finite element analysis. J Oral Rehabil 2002;29:565-74.   DOI   ScienceOn
23 Hansson S, Werke M. The implant thread as a retention element in cortical bone: the effect of thread size and thread profile: a finite element study. J Biomech 2003;36:1247-58.   DOI   ScienceOn
24 Nam OH, Yu WJ, Kyung HM. Cortical bone strain during the placement of orthodontic microimplant studied by 3D finite element analysis. Korean J Orthod 2008;38:228-39.   DOI
25 Park JS, Yu WJ, Kyung HM, Kwon OW. Finite element analysis of cortical bone strain induced by self-drilling placement of orthodontic microimplant. Korean J Orthod 2009;39:203-12.   DOI