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From the application of the finite element analysis in biomechanical studies, this paper studies on the biomechanical model of how to reflect the true biological model, and proposes some innovative processing: mandible model simplification, boundary conditional load and accurate assignment of mandible materials. After the finite element simulations of the layouts of implant in mandibular dental defect,...
Effects of retention groove location and dimensions of threaded glass fiber post on the maximum retention force of the restorative system and the maximum equivalent stress in the root were numerically investigated. Results show that the retention groove can effectively enhance retention ability and reduce the stress in the root. And the maximum retention force of the restorative system can be increased...
The objective of this study was to present a novel method to make a preoperative effect of surgery based on occlusal contact. This method could make preoperative prediction for the orthognathic surgery. The three-dimensional model including maxillary and mandible was reconstructed by CT data, then the finite element model of occlusion was rebuilt after simplified articular disc, The stress contour...
A new approach for segmenting different anatomical regions in dental Computed Tomography (CT) studies is presented in this paper. It is expected that the proposed approach will help automate different tissues regions by providing initial boundary points for deformable models or seed points for split and merge segmentation algorithms. Preliminary results obtained for dental CT studies of dentate and...
In this paper, effect of the implant thread profile on the stability and osseointegration at the peri-implant bone were evaluated by finite element analysis. These study include five different common threads profile of implant body - buttress, reverse buttress, V-shape, sinusoidal and square - that were evaluated via finite element analysis. Three dimensional model of a mandible was reconstructed...
Objective: This study aims to create twelve numerical models of implant-supported attachment-retained complete maxillary dentures by an efficient CT image segmentation and mesh creation technique, as well as evaluate mechanical characteristics of Model 1. Methods: Masks were first created after identifying regions of interest on CT scan images of maxillary prosthesis, then integrated with CAD models...
Based on solution of diffusion equation using finite element numerical method, the excitation light intensity field inside the teeth tissue and the auto-fluorescence distribution on the surface of simplified 3D teeth model excited by uniform light are both presented. The influence of optical parameters such as scattering coefficient, anisotropy coefficient etc. on the fluorescence distribution of...
Dental implants provide the most efficient and economic long-term solution for replacing lost teeth. However, placement of an implant changes the normal mechanical environment of jawbone, which causes the bone density to redistribute and adapt to the new environment by remodelling. This study aims to predict the density distribution in human jawbone surrounding a dental implant. Based on the two popular,...
The theoretical and finite element models are founded for partial implanted dentures and for the osseous tissues surrounding the dentures implanted in the lower jaw area. The influences of threads type on partial denture repairing are studied. The results indicate that the stress on cortical bone is much larger than cancellous one. The maximum stress occurs at the mesial side of distal implant fixed...
Dental implants are an effective, safe and predictable solution for patients suffering from tooth loss. However implant placement changes the normal mechanical environment of the jawbone leading to bone density redistribution and 'remodeling'. Many bone remodeling theories assume the presence of 100% contact between bone and implant, which is inconsistent with clinical reality in that about 50%~80%...
Previous studies have not produced a comprehensive description of the nonlinear hyperelastic stress-strain behavior of the periodontal ligament (PDL) of impacted tooth. In the present study, a simulation was applied to get the stress distribution in the PDL of impacted tooth. Firstly, a novel finite element modeling method for the PDL of impacted tooth based on CT image and reverse engineering was...
The localized management of sinus floor (LMSF) is one of key technologies in dental implant surgery, but the lining mucosa of maxillary sinus is easily impaled during LMSF surgery. This paper proposed a computer aided design method to construct 3-D finite element model of LMSF. Then the models are processed for analysis. Finally, the virtual surgery simulation was carried out from three aspects which...
The purpose of this research was to study the contact between adjacent teeth and the biomechanical reactions of the teeth root, mandible, and periodontal membrane under orthodontic forces. First, the mandible and mandibular dentition were scanned by spiral computed tomography, and then reconstructed. The contact problem of the three dimensional multi-body between arc wire orthodontic device and mandible...
This paper presents a three-dimensional method to locate the center of resistance (CRE) with a spatial kinematic method and finite element analysis. Firstly, finite element analyses with hypoelastic and also isotropic constitutive model of periodontal ligament were conducted to get the tooth displacements under various boundaries. Then a spatial kinematic method was used to solve the location of CRE...
How to build a precise finite element model for periodontal ligament (PDL) of impacted tooth is a key step in numerical simulation of orthodontics. However, it is difficult to obtain accurate three-dimensional model of impacted tooth which embed in alveolar bone. In this paper, combined with reverse engineering and CT image, a new finite element method is introduced. Firstly, create the surface model...
Dental implantation to a certain extent changes the biomechanical environment, thereby leading to the surrounding supporting bone to remodel. Computational remodeling has been well established in lone bone community and a range of mathematical formulae have been available with acceptable accuracy and effectiveness. However, there has been limited information and remodeling data available for dental...
To evaluate the effect of mesiodistal tilting of the terminal implants on the stresses distribution around the implant, a three dimensional (3D) model is designed by simulating an edentulous mandible, restored with mandibular cantilever bar overdenture and retained by 3 interforaminal implants. All the parameters are fixed except for the tilt of the terminal implants. Vertical and oblique loads are...
This paper presents a new hierarchical, modular and scalable model of a human face and oral cavity based on anatomical data taken from the Visible Human Project (National Institute of Health). The described model can further be adapted to any particular face and oral cavity of a human head by means of a finite elements method (FEM). The final aim will be to construct functional virtual medical patients
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