This study investigated in vivo degradation of Ti–6Al–4V alloy miniscrew implants. Miniscrew implants were placed in patients, and the surfaces were studied upon retrieval by scanning electron microscopy, microscale X-ray photoelectron spectroscopy, elastic recoil detection analysis and nanoindentation testing. Bone-like structures were formed on the retrieved specimens. The hardness and elastic modulus of the surfaces of the retrieved specimens were significantly lower than the as-received specimens, although no statistically significant differences were observed for the hardness and elastic modulus in the bulk region. Thick organic over-layer containing carbon, oxygen, and nitrogen, with the thickness greater than 50 nm, covered the retrieved specimens, and higher concentrations of hydrogen were detected in the retrieved specimens compared with the as-received specimens. Minimal degradation of the bulk mechanical properties of miniscrew implants was observed after clinical use, although precipitation of bone-like structures, formation of a carbonaceous contamination layer, and hydrogen absorption were observed on the surfaces of miniscrew implants.
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
This is a preview of subscription content, log in to check access
This study was partially supported by the Research Project of the Research Institute of Personalized Health Sciences, Health Sciences University of Hokkaido.
Branemark PI, Aspegren K, Breine U. Microcirculatory studies in man by high resolution vital microscopy. Angiology. 1964;15:329–32.CrossRefGoogle Scholar
Roberts WE, Smith RK, Zilberman Y, Mozary PG, Smith RS. Osseous adaptation to continuous loading of rigid endosseous implants. Am J Orthod. 1984;86:95–111.CrossRefGoogle Scholar
Kanomi R. Mini-implant for orthodontic anchorage. J Clin Orthod. 1997;31:763–7.Google Scholar
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.CrossRefGoogle Scholar
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.CrossRefGoogle Scholar
Kuroda S, Yamada K, Deguchi T, Hashimoto T, Kyung HM, Takano-Yamamoto T. Root proximity is a major factor for screw failure in orthodontic anchorage. Am J Orthod Dentofacial Orthop. 2007;131(Supp 1):S68–73.CrossRefGoogle Scholar
Schätzle M, Männchen R, Zwahlen M, Lang NP. Survival and failure rates of orthodontic temporary anchorage devices: a systematic review. Clin Oral Implants Res. 2009;20:1351–9.CrossRefGoogle Scholar
Deguchi T, Yabuuchi T, Hasegawa M, Garetto LP, Roberts WE, Takano-Yamamoto T. Histomorphometric evaluation of cortical bone thickness surrounding miniscrew for orthodontic anchorage. Clin Inplant Dent Res. 2009;13:197–205.CrossRefGoogle Scholar
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 Impl Res. 2005;16:473–9.CrossRefGoogle Scholar
Yokoyama K, kaneko K, Moroyama K, Asaoka K, Sakai J, Nagumo M. Hydrogen embrittlement of Ni–Ti superelastic alloy in fluoride solution. J Biomed Mater Res A. 2003;65A:182–7.CrossRefGoogle Scholar
Rodrigues DC, Urban RM, Jacobs JJ, Gilbert JL. In vivo severe corrosion and hydrogen embrittlement of retrieved modular body titanium alloy hip-implants. J Biomed Mater Res B Appl Biomater. 2009;88:206–19.CrossRefGoogle Scholar
Zinelis S, Eliades T, Pandis N, Eliades G, Bourauel C. Why do nickel-titanium archwires fracture intraorally? Fractograpic analysis and failure mechanism of in vivo fractured wires. Am J Orthod Dentofacial Orthop. 2007;132:84–9.CrossRefGoogle Scholar
Esposito M, Lausmaa J, Hirsch JM, Thomsen P. Surface analysis of failed oral titanium implants. J Biomed Mater Res. 1999;48:559–68.CrossRefGoogle Scholar
Eliades T, Zinelis S, Papadopoulos MA, Eliades G. Characterization of retrieved orthodontic miniscrew implant. Am J Orthod Dentofacial Orthop. 2009;135:10.e1–7.Google Scholar
Ishihara Y, Kuroda S, Sugawara Y, Balam TA, Takano-Yamamoto T, Yamashiro T. Indirect usage of miniscrew anchorage to intrude overerupted mandibular incisors in a class II patient with a deep overbite. Am J Orthod Dentofacial Orthop. 2013;143:S113–24.CrossRefGoogle Scholar
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.CrossRefGoogle Scholar
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.Google Scholar
Iijima M, Muguruma T, Brantley WA, Okayama M, Yuasa T, Mizoguchi I. Torsional properties and microstructures of mini-screw implants. Am J Orthod Dentofacial Orthop. 2008;134:333.e1–6.Google Scholar
Hoeppner DW, Chandrasekaran V. Fretting in orthopedic implants: a review. Wear. 1994;173:189–97.CrossRefGoogle Scholar