scholarly journals Assessment of Peri-Articular Implant Fitting Based on Statistical Finite Element Modeling

2008 ◽  
Author(s):  
Serena Bonaretti ◽  
Nils Reimers ◽  
Mauricio Reyes ◽  
Andrei Nikitsin ◽  
Anders Joensson ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Principal Component ◽  
Target Population ◽  
Bone Surface ◽  
Biomechanical Stability ◽  
Element Analysis ◽  
Bone Implant ◽  
Implant Position ◽  
Best Fit

We present a framework for statistical finite element analysis allowing performing statistical statements of biomechanical performance of peri-articular implants across a given population. In this paper, we focus on the design of orthopaedic implants that fit a maximum percentage of the target population, both in terms of geometry and biomechanical stability. CT scans of the bone under consideration are registered non-rigidly to obtain correspondences in position between them. A statistical model of shape is computed by means of principal component analysis. A method to automatically propagate standardize fractures on the statistically-based bone population has been developed as well as tools to optimize implant position to best-fit the bone surface. Afterwards, finite element analysis is performed to analyse the biomechanical performance of the bone/implant construct. The mechanical behaviour of different PCA bone instances is compared for tibia representing the Asian and Caucasian populations.

scholarly journals Bone Loss in Bruxist Patients Wearing Dental Implant Prostheses: A Finite Element Analysis

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1132
Author(s):  
Luis-Guillermo Oliveros-López ◽  
Raquel Castillo-de-Oyagüe ◽  
María-Ángeles Serrera-Figallo ◽  
Álvaro-José Martínez-González ◽  
Andrea Pérez-Velasco ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Bone Loss ◽  
Cortical Bone ◽  
Bone Surface ◽  
Element Analysis ◽  
Bone Implant ◽  
Surface Loss ◽  
Neck Area ◽  
M 12

Bruxism is an unconscious, involuntary and sustained motor activity that results in excessive teeth grinding or jaw clenching that could affect patients’ implants and rehabilitations. The aetiology for bruxism remains unknown, but it is known to involve multiple factors. The literature lacks studies on the possible effect of implant morphology on the resistance of the bone-implant osseointegrated interface when bruxism is present. Our objective is to assess the mechanical response of the bone-implant interface in bruxist patients whose implant prostheses are subjected to parafunctional cyclic loading over a simulated period of 10 years. A comparison was carried out between two implant types (M-12 and Astra Tech), and a pattern of bone loss was established considering both the stress state and the cortical bone surface loss as the evaluation criteria. Numerical simulation techniques based on the finite element analysis method were applied in a dynamic analysis of the received forces, together with a constitutive model of bone remodelling that alters the physical properties of the bone. The simulated cortical bone surface loss at the implant neck area was 8.6% greater in the Astra implant than in the M-12 implant. Compared to the M-12 implant, the higher sustained stress observed over time in the Astra implant, together with the greater cortical bone surface loss that occurred at its neck area, may be related to the major probability of failure of the prostheses placed over Astra implants in bruxist patients.

Three-Dimensional Nonlinear Contact Finite Element Analysis of Mandibular All-on-4 Design

2015 ◽  
Vol 41 (2) ◽  
pp. e12-e18 ◽  
Author(s):  
Mostafa Omran Hussein ◽  
Mahmoud Elsayed Rabie
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Equivalent Stress ◽  
Stress And Strain ◽  
Element Analysis ◽  
Implant Position ◽  
Finite Element Software ◽  
Edentulous Mandible ◽  
Nonlinear Contact ◽  
Position And Orientation

The All-on-4 design was used successfully for restoring edentulous mandible. This design avoids anatomic cripples such as inferior alveolar nerve by tilting posterior implants. Moreover, tilting posterior implants of All-on-4 design had a mechanical preference than the conventional design. On the other hand, the anterior implants are parallel at the lateral incisor region. Several researches showed favorable results for tilting posterior implants. However, research did not study the influence of the anterior implant position or orientation on the mechanical aspects of this design. This study analyzes the influence of varying anterior implant position and orientation of the All-on-4 design using nonlinear contact 3D finite-element analysis. Three copied 3-dimensional models of the All-on-4 design were classified according to anterior implant position and orientation. The frictional contact between fixtures and bone was the contact type in this finite element analysis. Finally, von Mises stress and strain at implant and bone levels were recorded and analyzed using finite element software. Stress concentrations were detected mainly around the posterior implant at the loaded side. Values of the maximum equivalent stress and strain were around tilted implants of design III followed by design II, then design I. Changing the position or orientation of the anterior implants in All-on-4 design influences stress-strain distribution of the whole design.

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