ABSTRACT
The mandibular bone, modeled as a cancellous bone surrounded by the cortical bone and the Osteoplant components are presented in Figure 1.
1 INTRODUCTION
Stress concentrations levels in the rigid interface between the dental implant and the adjacent bone are different compared to the tooth/bone system where the presence of periodontal ligament serves as hyper-viscoelastic interface (Koca et al. 2005, Misch et al. 2007, Baggi et al. 2008). Works in this direction located these concentrations in the implant neck region (Natali & Pavan, 2002, Natali & Pavan 2003, Djebbar et al. 2010) causing painful conditions in the jaw bone (Hoshaw et al. 1994, Jung et al. 1996, Heckmann et al. 2001). To overcome these disadvantages, some researchers have proposed models with accessories such the intra mobile element (Babbush et al. 1987), the elastic collar around the neck of the implant (Abu-Hammad et al. 2000), or even an artificial ligament, Choi (2000) while other approaches have attempted to geometric modifications to optimize implant design according to their biomechanical performance (Papavasiliou et al. 1996, Geramy et al. 2004, Bozkaya et al. 2004, Lídia et al. 2004, Yokoyama et al. 2005). Biologically, the interface is constituted by the osseointegration phenomenon of the bone regeneration which tends to fill the gap in the bottom of the implant thread (Geng et al. 2004). The effect of periodontal ligament in natural system has given the idea for an investigation to introduce at implant component interfaces judiciously selected, two elastomeric bio-inert mass to break a load transfer from the implant to the bone. The objective is to compare the stress levels in two different Osteoplant implant types. The first is
Mastication can be assumed as normal dynamic cyclic load on the upper crown area. This implies a fatigue study to determine alternating stress effect on dental implants lifespan. However, several works have been conducted in static loading conditions in geometrical parameters study in order to quantify stress levels in the bone. The boundary conditions are defined in Figure 2.
