BIOMECHANICAL STRESS ANALYSIS OF BONE-IMPLANT INTERFACE

Over the last decade immediate load protocol has been revalued in the field of oral implantology with a view to achieve a simpler implantation protocol. This would lead to relevant advantages, such as a lower invasive impact of implantation and a shorter timing of treatment, with the patient regaining total masticatory functionality within the immediate post operative stage. In order to optimize the immediate load protocol and to foster implant osseointegration, the Italian Implantology School has developed soldering techniques by welding one or more stabilizing bars. Welding techniques allow obtaining a better primary stability in the early post-operatory period in comparison with non-supported implants, as micromovements are reduced and stress/strain distribution at bone-implant interface is more balanced. The present essay "Biomechanical stress analysis of bone-implant interface" is intended to study the distribution of stress/strain exerted by masticatory loads onto the pen-implant bone, with a view to decide whether the bar may be removed by completion of the healing process without relevant impact on bone strain. Secondly, it will be estimated whether the use of two bars undersized in diameter and symmetric to the implant can be compared with the application of one bar only. Finite Element analysis was performed. The results demonstrated that the use of a stiff definitive prosthesis (metal-porcelain) allows to remove the bar after 90 days' recovery, thus avoiding any cosmetic, hygienic and prosthetic contraindication.