Stress distribution patterns at mini-implant site during retraction and intrusion--a three-dimensional finite element study

Progress in Orthodontics
Gautham Sivamurthy, Shantha Sundari

Abstract

The purpose of this study was to evaluate the stress patterns produced in mini-implant and alveolar bone, for various implant dimensions, under different directions of simulated orthodontic force, using a three-dimensional finite element method. Eight finite element (FE) models of mini-implant and bone were generated with insertion angles of 30° and 60°, diameters of 1 and 1.3 mm, and lengths of 6 and 8 mm. A simulated constant orthodontic force of 2 N was applied to each of these FE models in three directions simulating anterior retraction, anterior intrusion and retraction, and molar intrusion. Comparison of the maximum von Mises stress in the mini-implant showed that the 1-mm diameter produced significantly high stress, and the amount of stress produced was more for a mini-implant inserted at an angle of 60°. The cortical bone showed that high stresses were generated for the 1-mm-diameter mini-implant and on increasing the insertion angulation from 30° to 60°, the stress produced increased as well. The comparison of von Mises stress in the cancellous bone was insignificant as the amount of stress transmitted was very low. The 1-mm-diameter mini-implants are not safe to be used clinically for orthodontic anchorage. The 1.3 × ...Continue Reading

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Citations

Jun 7, 2016·Progress in Orthodontics·Ivan Toshio MaruoOrlando Motohiro Tanaka
Nov 6, 2018·Progress in Orthodontics·Sumit YadavAditya Tadinada
Jul 6, 2016·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Sulieman S Al-JohanyBassam Alalola

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