Evaluation of insertion torque of different orthodontic miniscrews: An in vitro study
AbstractBackground and objective: The purpose of this study was to evaluate the torque insertion for drill and non drill techniques of two commercially available miniscrews. Methods: Eighty mini screws (forty Dentos miniscrews/Korea and forty 3M miniscrews/USA), having the same length and diameter, were divided into two groups for each type. Two techniques, non-drill and drill, were used. In drill techniques, manufacturer recommended drill was used. Two bovine tibias were obtained. The first technique used pre drill hole, which was made in the bone using the recommended bur (1.0 diameter). The mini-screw was placed at 9 mm manually, then the remaining 1 mm was inserted through digital torque meter. The same procedure was repeated but without a pilot hole. Results: 3M miniscerws gave high torque insertion in two techniques. Conclusion: The shape, thread design and tip geometry of miniscerw play an important role in the torque insertion.
Gracco A, Cirignaco A, Cozzani M, Boccaccio A, Pappalettere C, Vitale G. Numerical/ experimental analysis of the stress field around miniscrews for orthodontic anchorage. Eur.J.Orthod 2009; 31: 12-20.
Kim WJ, Ahn SJ, Chang Y. Histomorphometric and mechanical analysis of the drill free screw as orthodontic anchorage, Am J Orthod Dentofacial Orthop 2005; 128:190-4.
Heidemann W, Gerlach KL, Grobel KH, Kollner HG: Drill free screws. A new form
of osteosynthesis screws. J Cranio Max Surg 1998; 26: 163-8.
Dalstra M, Cattaneo PM, Melsen B. Load transfer of miniscrews for orthodontic anchorage, Orthodontics 2004;1:53-62.
Park SH, Yen S, Jeoung SH. Histological and biomechanical characteristics of orthodontic self-drilling and self-tapping microscrew implants. Korean J Orthod 2006; 36:295-307.
Lim SA, Cha JY, Hwang CJ. Insertion torque of orthodontic miniscrews according to changes in shape, diameter and length. Angle Orthod 2008; 78:234-40,
Jian-H Yu, Yang-S L, Wen-J Ch, Yau- Z, Ch, Chun-L. Mechanical Effects of Micro-thread Orthodontic Mini-screw Design on Artificial Cortical Bone. Journal of Medical and Biological Engineering 2012; 34(1): 49-55.
Friberg B, Sennerby L, Roos J, Johansson P, Strid CG, Lekholm U. Evaluation of bone density using cutting resistance measurements and microradiography: an in vitro study in pig
ribs. Clin Oral Implants Res 1995;6:164-71.
Ikumi N, Tsutsumi S. Assessment of correlation between computerized tomography values of the bone and cutting torque values at implant placement: a clinical study. Int J Oral Maxillofac Implants 2005;20:253-60.
Niimi A, Ozeki K, Ueda M, Nakayama B. A comparative study of removal torque of endosseous implants in the fibula, iliac crest and scapula of cadavers: a preliminary report. Clin Oral Implants Res 1997;8:286-9.
Beer A, Gahleitner A, Holm A, Tschabitscher M, Homolka P. Correlation of insertion torques with bone mineral density from dental quantitative CT in the mandible. Clin Oral Implants Res 2003;14:616-20.
O'Sullivan D, Sennerby L, Meredith N. Influence of implant taper on the primary and secondary stability of osseointegrated titanium implants. Clin Oral Implants Res 2004;15:474-80.
Jung Y Ch, Tae MY, Chung H. Insertion and removal torques according to orthodontic mini-screw design. Korean J Orthod 2008;38(1):5-12.
Song Y, Cha Y, Hwang C. Mechanical characteristics of various orthodontic mini-screws in relation to artificial cortical bone thickness. Angle Orthod 2007; 77:979-85
Kuroda S, Sugawara Y, Deguchi T, Kyung HM, Takano Yamamoto T. Clinical use of miniscrew implants as orthodontic anchorage: success rates and postoperative discomfort.
Am J Orthod Dentofacial Orthop 2007;131:9-15.
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.
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.
Chen YJ, Chen YH, Lin LD, Yao CC. Removal torque of miniscrews used for orthodontic anchorage--a preliminary report. Int J Oral Maxillofac Implants 2006;21:283-9.
Lawes TJ, Scott JC, Goodship AE. Increased insertion torque delays pin-bone interface loosening in external fixation Effects of Micro-thread Design on Artificial Bone 55 with tapered bone screw J.Orthop.Trauma 2004;18:617-22.
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.
Norton MR. Marginal bone levels at single tooth implants with a conical fixture design. The influence of surface macro-and microstructure. Clin. Oral Implants Res 1998; 9:91-9.
Lin C, Yu H, Liu H, Lin C, Lin Y. Evaluation of the relative contributions of orthodontic mini-screw design factors using FE analysis and the Taguchi method. J. Biomech 2010;43:2174-81.
Frost HM. Woff’s law and bone’s structural adaptations to mechanical usage: an overview for clinicians. Angle Orthod 1994; 64:175-88.
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
The copyright on any article published in Zanco J Med Sci is retained by the author(s) in agreement with the Creative Commons Attribution Non-Commercial ShareAlike License (CC BY-NC-SA 4.0).