3D finite element analysis to detect stress distribution: spiral family implants

Abstract

Aim Spiral family implants are a root-form fixtures with increasing thickness of tread. This characteristic gives a self-tapping and self-condensing bone properties to implants. To study spiral family implant inserted in different bone quality and connected with abutments of different angulations a Finite Element Analysis (FEA) was performed. Once drawn the systems that were object of the study by CAD (Computer Aided Design), the FEA discretized solids composing the system in many infinitesimal little elementary solids defined finite elements. This lead to a mesh formation where the single finite elements were connected among them by nodes. For the 3 units bone-implant-abutments several thousand of tetrahedral elements having 10 parabolic nodes were employed. Materials and methods The biomechanical behaviour of 4.2 mm x 13 mm dental implants, connecting screw, straight and 15° and 25° angulated abutment subjected to static loads, in contact with high and poor bone quality was evaluated by FEA. A double system was analyzed: a) FY strength acting along Y axis and having 200 N intensity; b) FY and FZ couple of strengths applied along Y and Z directions and having respectively 200N and 140N intensity. The materials were considered as homogeneous, linear and isotropic. Then the FEA simulation was performed hypothesizing a linearity between loads and deformations. Results The lowest stress value was found in the system composed by implants and straight abutments loaded with a vertical strength, while the highest stress value were found in implants and 15° angulated abutment loaded with a angulated strength. In addition, the lower is the bone quality (i.e. D4) the higher is the distribution of the stress within the bone. Conclusion Spiral family implants can be used successfully in low bone quality but a straight force is recommended.

Does the prosthesis weight matter? 3D finite element analysis of a fixed implant-supported prosthesis at different weights and implant numbers

“…21 The mechanical properties of the materials and structures are summarized in Table 1. [22][23][24][25][26][27][28][29][30][31][32][33][34] The standard earth gravity direction for this study was defined along the Z-axis (negative direction) of the coordinate system with 9.8065 m/s 2 of acceleration. A restriction only occurred on the bone for the Z-axis, allowing lateral strain of the peri-implant bone.…”

Biomechanical Behaviour of a Jawbone Loaded With a Prosthetic System Supported by Monophasic and Biphasic Implants

“…In Figure 3 and in Figure 4 has been represented the trend of the bone deformation, assessed according to the von Mises theory. Observing the Figures 3 and 4, it is possible to observe that the stress distribution on the bone crest is different according to the implant geometry used, and these changes in response to stress, affect the biomechanical behavior of the prosthetic component (7)(8)(9)(10). grade 4.…”

Comparison of Platform Switched and Sloping Shoulder Implants on Stress Reduction in various Bone Densities: Finite Element Analysis

“…The FEAs have been used to study the effects of various shapes of dental implants on distribution of stresses generated in the jawbone and also establish an optimal thread shape that can ensure better distribution of stress. 6 The occlusal force at the bone implant interface is a principal factor that determines the outcome of the implant. Hence, the implant design must ensure distribution of the functional forces to the supporting structures within the physiological values.…”