Initial Stree Analysis Of A Cuspid And An Endosseous Implant Anchorage In Orthodontic Treatment

Objective:To determine and compare the initial stress profiles in an upper cuspid and an endosseous implant with different moments and forces ( simulating canine retraction with elastic chains and T - loops) by using the finite element method. Methods: A 3 - dimensional mathematical model was constructed that uses the finite element method, which simulated an endosseous implant and an upper canine with its periodontal ligament and cortical and cancellous bone. Levels of initial stress were measured during 2 types of canine retraction mechanics. Results: The lower magnitude and more uniform stresses in the implant were found to have a moment - force ratio( M/F) of 6. 1 , whereas the canine and its supporting structures exerted a M/F ratio of 10. 3. Conclusions: On the basis of these results, when the anchor unit is an endosseous implant, it seems better to use a precalibrated retraction system ( T - loop) where a low load - deflection curve would be generated.