1 Abstract The purpose of this study is to analyze and compare the implant-bone interface stresses using three-dimensional finite element models of a partially osseointegrated implant with platform and a conventional matching-diameter implant platform and abutment in the anterior mandible. In order to reach this purpose the mechanical properties of both peri-implantar regions will be modelled as isotropic and resonance frequency analysis will be used to validate their values. Material properties of compact and cancellous bone are modelled as transversely isotropic and isotropic, respectively. The osseointegration process is simulated by changing the Young`s modulus of the implant-bone interfacial tissue. The numerical resonance frequency is validated by means of clinical measurement assessed using a resonance frequency analysis (RFA) device that uses magnetic technology (Ostell). For static analysis one model is simulated using a 4.3 mm diameter abutment connection and the other uses a narrower 3.7 mm diameter abutment connection, simulating a platform-switching configuration. The loading scenario consists of an oblique (200 N vertical and 40 N horizontal) occlusal load and, perfect bonding is assumed at all interfaces. The results suggest that the use of resonance frequency analysis using an electromagnetic pulse is sensitive and hence can be used to qualify the implant stability during the osseointegration process. Keywords: platform switching, dental implants, finite element. 1 Introduction Histologic and radiographic observations suggest that a biological dimension of hard and soft tissues around dental implants extends apically from the implant-abutment interface [1]. The stress and strain distribution developed on this surrounding bone is Paper 137 Finite Element Comparison of Dental Implants: Static and Dynamic Analysis M.A. Neto 1 , P. Nicolau 2 , S. Rocha 2 and R.P. Leal 1 1 Department of Mechanical Engineering, Faculty of Sciences and Technology University of Coimbra, Portugal 2 Department of Dentistry, Faculty of Medicine University of Coimbra, Portugal ©Civil-Comp Press, 2012 Proceedings of the Eighth International Conference on Engineering Computational Technology, B.H.V. Topping, (Editor), Civil-Comp Press, Stirlingshire, Scotland