Initial stress differences between sliding and sectional mechanics with anendosseous implant as Anchorage: A 3-dimensional finite element analysis

Endosseous implants have been used as orthodontic anchorage in recent years . A 3-dimensional. mathematical model was constructed that uses the finite element method, which simulated an endosseous implant and an upper canine w ith its periodontal ligament and cortical and cancellous bone. Levels of in itial stress were measured during 2 types of canine retraction mechanics (f riction and frictionless). The lower magnitude and more uniform stresses in the implant and its cortical bone were found to have a moment-force ratio (M/F) of 6.1:1, whereas the canine and its supporting structures exerted a M/F ratio of 10.3:1. On the basis of these results, when the anchor unit is an endosseous implant, it seems better to use a precalibrated retraction s ystem without friction (T-loop) where a low load-deflection curve would be generated.