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The human body represents the most important topic for many researchers. In our days, the science complexity demands the involvement of many resources and the coordinated team work of doctors, engineers, and other specialists. In the case of dental medicine, due to the nature of teeth material, their dimension and geometrical position, very important problems, like fractures, cannot be studied with...
The prevention of dental stomatitis still represent a challenge for dentists and more studies are necessary in order to find the optimal prevention method. One of the direction is to take into consideration how silver nanoparticles could influence the structure of the resins and mechanical and physical properties. In our research we investigate the stress distribution in a dental acrylic resins reinforced...
Palpation is important medical diagnostic technic to make correct diagnosis of symptomatic state. It requires a lot of palpation experience under leadership of an experienced medical doctor. Hence, a palpation training system with virtual model of an affected part is useful to get better at the skill. However, there is no practical training for maxillofacial palpation in the dental education curriculum...
The purpose of this study was to investigate the fatigue life of an endosseous root-form dental implant using finite element analysis. A conventional Brånemark dental implant system was redesigned to utilize the biocompatible, lightweight magnesium alloy which promotes bone growth. ANSYS Workbench 11.0 was used to generate a three-dimensional mesh of a model created with the actual size specifications...
Skull is one of the major and complicated structures in human body. Significant amount of research has been made in treating the injuries and abnormalities of skull in medical field. Research is also going on in studying the behavior of skull under various loading conditions, developing new methodologies and materials for treatment in the field. Such attempts are also increasing in mechanical field,...
Behavior of the peri-implant tissue following a dental implant surgery is simulated. The cascade of tissue responses starting with healing, followed by remodeling are investigated. Although different implant designs, implant widths and amounts of micro-motion during the healing period were all shown to have important effects on the long-term status of the surrounding region; the amount of micro-motion...
There has been an increase in the number of dentist since the 1950s in Japan. This has been recognized as one of medical issues in Japan. The increase of dentists causes a reduction of diagnostic opportunity per dentist and becomes a factor which declines the quality of dental therapy. By the way the education contents implemented in dental college has not been changed, where dental students study...
In dentistry, computer assisted systems have been used to simulate and navigate the treatment planes i.e. computer-assisted design (CAD), which assists in minimizing the high costs of the product development process and allows the developers to simulate the same conditions that would take place under physical standards and conditions. In addition to the cost and time reduction benefits, CAD allows...
When repeating chewing force is applied to the dental implant, gap is often generated at the interface surface between the abutment and the fixture, and results in some deteriorations such as loosening of fastening screw, dental retraction and fixture fracture. To cope with such problems, this study focuses on the design of the interface surface shape of the abutment, and proposes a new sealing-type...
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...
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 work, a two-spindle CNC machine tool used for dental restorations is designed. In view of the fact that its special characteristics of the applications, the mechanical structure and main part of the machine tool have been designed and chosen with careful calculation. The characteristics of denture processing have been analyzed by using functional analysis approach, then, the mechanical structure...
Implant-abutment connection plays an important role in the long-term success of dental implant. It should be able to resist bacterial leakage. Colonization of bacterial in microgaps along implant-abutment interfaces will lead to inflammatory reaction. One of the factor which have been identified to produce microgaps is micromotion. This study was conducted to analyse micromotion and stress distribution...
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...
Conventional tooth implants lacks the damping prosperities of the periodontal ligaments (PDL) compound. It may therefore, disrupts the natural function of implant and leads to excessive stress and strain in jaw bone. Our new proposed implant has the viscoelastic properties needed to overcome such difficulties. A three dimensional finite element model of modified implant was developed and was subjected...
In dentistry the restoration of decayed teeth is challenging and makes great demands on both the dentist and the materials. Hence, fiber-reinforced posts have been introduced. The effects of different variables on the ultimate load on teeth restored using fiber-reinforced posts is controversial, maybe because the results are mostly based on non-standardized in vitro tests and, therefore, give inhomogeneous...
Closed-form analytical formulas for a tooth of paraboloidal shape under the orthodontic force are presented. These formulas are based on both the approximation of strains according to the displacement of the tooth and the tooth equilibrium of the thin surrounding periodontal membrane. The proposed formulas are capable of determining the most important quantities involved the distribution of strain...
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,...
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