Comparative evaluation of insertion torque and mechanical stability for self-tapping and self-drilling orthodontic miniscrews – an in vitro studyReportar como inadecuado




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Head and Face Medicine

, 13:10

First Online: 30 May 2017Received: 18 May 2016Accepted: 23 May 2017DOI: 10.1186-s13005-017-0143-3

Cite this article as: Tepedino, M., Masedu, F. & Chimenti, C. Head Face Med 2017 13: 10. doi:10.1186-s13005-017-0143-3

Abstract

BackgroundThe aim of the present study was to evaluate the relationship between insertion torque and stability of miniscrews in terms of resistance against dislocation, then comparing a self-tapping screw with a self-drilling one.

MethodsInsertion torque was measured during placement of 30 self-drilling and 31 self-tapping stainless steel miniscrews Leone SpA, Sesto Fiorentino, Italy in synthetic bone blocks. Then, an increasing pulling force was applied at an angle of 90° and 45°, and the displacement of the miniscrews was recorded.

ResultsThe statistical analysis showed a statistically significant difference between the mean Maximum Insertion Torque MIT observed in the two groups and showed that force angulation and MIT have a statistically significant effect on miniscrews stability. For both the miniscrews, an angle of 90° between miniscrew and loading force is preferable in terms of stability.

ConclusionsThe tested self-drilling orthodontic miniscrews showed higher MIT and greater resistance against dislocation than the self-tapping ones.

KeywordsMiniscrew Implant design Orthodontic mini-implant Insertion torque Stability AbbreviationsMITmaximum insertion torque

TADtemporary anchorage device

Electronic supplementary materialThe online version of this article doi:10.1186-s13005-017-0143-3 contains supplementary material, which is available to authorized users.





Autor: Michele Tepedino - Francesco Masedu - Claudio Chimenti

Fuente: https://link.springer.com/







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