Finite Element Analysis of Bone Stress around Micro-Implants of Different Diameters and Lengths with Application of a Single or Composite Torque Force.

Abstract

BackgroundStress on the bone surrounding dental micro-implants affects implant success.PurposeTo compare the stress on the bone surrounding a micro-implant after application of a single force (SF) of 200 g or a composite force (CF) of 200 g and 6 N.mm torque.Materials and methodsFinite element models were developed for micro-implant diameters of 1.2, 1.6, and 2.0 mm, and lengths of 6, 8, 10, and 12 mm and either a SF or CF was applied. The maximum equivalent stress (Max EQS) of the bone surrounding the micro-implant was determined, and the relationships among type of force, diameter, and length were evaluated.ResultsThe Max EQS of the CF exceeded that of the SF (PConclusionWhen considering the use of an implant to perform three-dimensional control on the teeth, the implant diameter chosen should be > 1.2 mm.