The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform

Grant P. Steven - One of the best experts on this subject based on the ideXlab platform.

  • Towards automated 3D finite element modeling of direct fiber reinforced composite Dental Bridge
    Journal of Biomedical Materials Research Part B, 2005
    Co-Authors: Wei Li, Qing Li, Michael V. Swain, Grant P. Steven
    Abstract:

    An automated 3D finite element (FE) modeling procedure for direct fiber reinforced Dental Bridge is established on the basis of computer tomography (CT) scan data. The model presented herein represents a two-unit anterior cantilever Bridge that includes a maxillary right incisor as an abutment and a maxillary left incisor as a cantilever pontic bonded by adhesive and reinforced fibers. The study aims at gathering fundamental knowledge for design optimization of this type of innovative composite Dental Bridges. To promote the automatic level of numerical analysis and computational design of new Dental biomaterials, this report pays particular attention to the mathematical modeling, mesh generation, and validation of numerical models. To assess the numerical accuracy and to validate the model established, a convergence test and experimental verification are also presented.

  • Fibre reinforced composite Dental Bridge. Part I: Experimental investigation.
    Biomaterials, 2004
    Co-Authors: Michael V. Swain, Jim Ironside, Grant P. Steven
    Abstract:

    This experimental investigation aims at revealing the mechanical behaviour and failure pattern of direct fibre-reinforced resin-bonded Dental Bridge with various designs. To evaluate the overall effects of some newly developed Dental materials, in the experiment, genuine composite Dental Bridge specimens are prepared and tested. The ultimate load, stiffness and mode at the failure of the Bridges are measured and compared with the design variations. A good agreement between test and some clinical observations is demonstrated. It is verified that the weakest region appears across the pontic-abutment interface in the composite Bridges. This study suggests that the composite Bridges reinforced by fibres and supported by adjacent teeth could be of a higher structural strength and stiffness; therefore would provide better clinical performances.

  • Fibre reinforced composite Dental Bridge. Part II: Numerical investigation.
    Biomaterials, 2004
    Co-Authors: Michael V. Swain, Jim Ironside, Grant P. Steven
    Abstract:

    Motivated by the clinical success and limitations on experimental investigation of the fibre-reinforced composite Dental Bridge, this paper aims at providing a numerical investigation into the Bridge structure. The finite element (FE) model adopted here is constructed from computer tomography images of a physical Bridge specimen. The stress and strain distributions in the Bridge structure especially in the bonding interfaces are analyzed in detail. The peak stresses and their variations with the different Bridge designs are evaluated. Due to the lower bond strengths of adhesives and the high stress concentration in the pontic–abutment interface, the likelihood of failure in the interface is predicted by finite element analysis. The validity of the numerical results is established by a good agreement between the FE prediction and the tests in the load–deflection responses, the structural stiffness as well as the failure location of the composite Dental Bridge.

  • Preliminary Studies on the Optimum Shape of Dental Bridges
    Computer methods in biomechanics and biomedical engineering, 2000
    Co-Authors: Kaarel A Proos, Grant P. Steven, Michael V. Swain, Jim Ironside
    Abstract:

    Several pre-existing anterior and posterior Dental Bridge models using Finite elements and the new ceramic material In-Ceram have been developed. The mechanical behaviour of these models has been compared with optimised profiles obtained from a newly developed evolutionary algorithm known as Evolutionary Structural Optimisation (ESO). The results show that the mechanical behaviour of the Bridges was mainly restricted by the properties of the porcelain veneer and the design of the Bridges themselves. For the case of the anterior Bridge, it was found that there existed a specific thickness of veneer that minimised the maximum principal stress. This was related to peak stresses that occurred at the Bridge surface. Peak stresses also occurred in the material interface between the In-Ceram and the veneer. These extreme stresses were attributed to the notch size and shape. For the case of the posterior Bridge, it was concluded that the shape of the bottom of the Pontic tooth is crucial in reducing the magnitude...

Michael V. Swain - One of the best experts on this subject based on the ideXlab platform.

  • Design for minimizing fracture risk of all-ceramic cantilever Dental Bridge.
    Bio-medical Materials and Engineering, 2015
    Co-Authors: Zhongpu Zhang, Shiwei Zhou, Michael V. Swain
    Abstract:

    Minimization of the peak stresses and fracture incidence induced by mastication function is considered critical in design of all-ceramic Dental restorations, especially for cantilever fixed partial dentures (FPDs). The focus of this study is on developing a mechanically-sound optimal design for all-ceramic cantilever Dental Bridge in a posterior region. The topology optimization procedure in association with Extended Finite Element Method (XFEM) is implemented here to search for the best possible distribution of porcelain and zirconia materials in the Bridge structure. The designs with different volume fractions of zirconia are considered. The results show that this new methodology is capable of improving FPD design by minimizing incidence of crack in comparison with the initial design. Potentially, it provides Dental technicians with a new design tool to develop mechanically sound cantilever fixed partial dentures for more complicated clinical situation.

  • Numerical simulation of crack formation in all ceramic Dental Bridge
    Key Engineering Materials, 2006
    Co-Authors: Qing Li, Ionut Ichim, Jeffery Loughran, Michael V. Swain, Wei Li, Jules A Kieser
    Abstract:

    Ceramics have rapidly emerged as one of the major Dental biomaterials in prosthodontics due to exceptional aesthetics and outstanding biocompatibility. However, a challenging aspect remaining is its higher failure rate due to brittleness, which has to a certain extent prevented the ceramics from fully replacing metals in such major Dental restorations as multi-unit Bridges. This paper aims at simulating the crack initiation and propagation in Dental Bridge. Unlike the existing studies with prescriptions of initial cracks, the numerical model presented herein will predict the progressive damage in the Bridge structure which precedes crack initiation. This will then be followed by automatic crack insertion and subsequent crack growth within a continuum to discrete framework. It is found that the numerical simulation correlates well to the clinical and laboratory observations.

  • Towards automated 3D finite element modeling of direct fiber reinforced composite Dental Bridge
    Journal of Biomedical Materials Research Part B, 2005
    Co-Authors: Wei Li, Qing Li, Michael V. Swain, Grant P. Steven
    Abstract:

    An automated 3D finite element (FE) modeling procedure for direct fiber reinforced Dental Bridge is established on the basis of computer tomography (CT) scan data. The model presented herein represents a two-unit anterior cantilever Bridge that includes a maxillary right incisor as an abutment and a maxillary left incisor as a cantilever pontic bonded by adhesive and reinforced fibers. The study aims at gathering fundamental knowledge for design optimization of this type of innovative composite Dental Bridges. To promote the automatic level of numerical analysis and computational design of new Dental biomaterials, this report pays particular attention to the mathematical modeling, mesh generation, and validation of numerical models. To assess the numerical accuracy and to validate the model established, a convergence test and experimental verification are also presented.

  • Fibre reinforced composite Dental Bridge. Part I: Experimental investigation.
    Biomaterials, 2004
    Co-Authors: Michael V. Swain, Jim Ironside, Grant P. Steven
    Abstract:

    This experimental investigation aims at revealing the mechanical behaviour and failure pattern of direct fibre-reinforced resin-bonded Dental Bridge with various designs. To evaluate the overall effects of some newly developed Dental materials, in the experiment, genuine composite Dental Bridge specimens are prepared and tested. The ultimate load, stiffness and mode at the failure of the Bridges are measured and compared with the design variations. A good agreement between test and some clinical observations is demonstrated. It is verified that the weakest region appears across the pontic-abutment interface in the composite Bridges. This study suggests that the composite Bridges reinforced by fibres and supported by adjacent teeth could be of a higher structural strength and stiffness; therefore would provide better clinical performances.

  • Fibre reinforced composite Dental Bridge. Part II: Numerical investigation.
    Biomaterials, 2004
    Co-Authors: Michael V. Swain, Jim Ironside, Grant P. Steven
    Abstract:

    Motivated by the clinical success and limitations on experimental investigation of the fibre-reinforced composite Dental Bridge, this paper aims at providing a numerical investigation into the Bridge structure. The finite element (FE) model adopted here is constructed from computer tomography images of a physical Bridge specimen. The stress and strain distributions in the Bridge structure especially in the bonding interfaces are analyzed in detail. The peak stresses and their variations with the different Bridge designs are evaluated. Due to the lower bond strengths of adhesives and the high stress concentration in the pontic–abutment interface, the likelihood of failure in the interface is predicted by finite element analysis. The validity of the numerical results is established by a good agreement between the FE prediction and the tests in the load–deflection responses, the structural stiffness as well as the failure location of the composite Dental Bridge.

Jim Ironside - One of the best experts on this subject based on the ideXlab platform.

  • Fibre reinforced composite Dental Bridge. Part I: Experimental investigation.
    Biomaterials, 2004
    Co-Authors: Michael V. Swain, Jim Ironside, Grant P. Steven
    Abstract:

    This experimental investigation aims at revealing the mechanical behaviour and failure pattern of direct fibre-reinforced resin-bonded Dental Bridge with various designs. To evaluate the overall effects of some newly developed Dental materials, in the experiment, genuine composite Dental Bridge specimens are prepared and tested. The ultimate load, stiffness and mode at the failure of the Bridges are measured and compared with the design variations. A good agreement between test and some clinical observations is demonstrated. It is verified that the weakest region appears across the pontic-abutment interface in the composite Bridges. This study suggests that the composite Bridges reinforced by fibres and supported by adjacent teeth could be of a higher structural strength and stiffness; therefore would provide better clinical performances.

  • Fibre reinforced composite Dental Bridge. Part II: Numerical investigation.
    Biomaterials, 2004
    Co-Authors: Michael V. Swain, Jim Ironside, Grant P. Steven
    Abstract:

    Motivated by the clinical success and limitations on experimental investigation of the fibre-reinforced composite Dental Bridge, this paper aims at providing a numerical investigation into the Bridge structure. The finite element (FE) model adopted here is constructed from computer tomography images of a physical Bridge specimen. The stress and strain distributions in the Bridge structure especially in the bonding interfaces are analyzed in detail. The peak stresses and their variations with the different Bridge designs are evaluated. Due to the lower bond strengths of adhesives and the high stress concentration in the pontic–abutment interface, the likelihood of failure in the interface is predicted by finite element analysis. The validity of the numerical results is established by a good agreement between the FE prediction and the tests in the load–deflection responses, the structural stiffness as well as the failure location of the composite Dental Bridge.

  • Preliminary Studies on the Optimum Shape of Dental Bridges
    Computer methods in biomechanics and biomedical engineering, 2000
    Co-Authors: Kaarel A Proos, Grant P. Steven, Michael V. Swain, Jim Ironside
    Abstract:

    Several pre-existing anterior and posterior Dental Bridge models using Finite elements and the new ceramic material In-Ceram have been developed. The mechanical behaviour of these models has been compared with optimised profiles obtained from a newly developed evolutionary algorithm known as Evolutionary Structural Optimisation (ESO). The results show that the mechanical behaviour of the Bridges was mainly restricted by the properties of the porcelain veneer and the design of the Bridges themselves. For the case of the anterior Bridge, it was found that there existed a specific thickness of veneer that minimised the maximum principal stress. This was related to peak stresses that occurred at the Bridge surface. Peak stresses also occurred in the material interface between the In-Ceram and the veneer. These extreme stresses were attributed to the notch size and shape. For the case of the posterior Bridge, it was concluded that the shape of the bottom of the Pontic tooth is crucial in reducing the magnitude...

Han-yi Cheng - One of the best experts on this subject based on the ideXlab platform.

  • Development of Effects on Chewing with Mandibular Fixed Dental Bridges with Implants via Finite Element Method
    Journal of Biomaterials and Tissue Engineering, 2020
    Co-Authors: Yun-ting Liu, Han-yi Cheng
    Abstract:

    The aim of the present research was to evaluate the biomechanics of Dental Bridge with and without implant. Oral models were reconstructed by 3D computer tomography images to simulate oral environment. The stress is an important role in Dental Bridge applications for osseointegration. Many studies have investigated finite element researches for Dental implants; however, few have evaluated a model for Dental Bridge with and without implant. The results revealed that abnormal focusing stress was found when Dental Bridge was used with implant. Moreover, the unbalance situation was found on the model with only one implant, the highest stress appeared in the present group. Dental Bridge with implants would be an effective means of recovering Dental performance. However, the present study showed that if only one pier with Dental implant in Bridge treatment has a potential to increase abnormal stress, and uniformly distributing stress.

  • Finite Element Analysis of Stress in Dental Bridge with Implant
    Journal of Biomaterials and Tissue Engineering, 2020
    Co-Authors: Wan-ting Huang, Han-yi Cheng
    Abstract:

    The objective of this research was to investigate Dental Bridges with and without implants. Threedimensional (3D) mandible models were reconstructed by computer tomography (CT) to simulate biting behaviors. The Dental implant is an important factor in Dental Bridge applications. Several studies have investigated finite element models for Dental implants; however, few have examined a model for Dental Bridge with implant. The results revealed that stress was significantly increased when Dental Bridge was used with implant. Moreover, the Dental Bridge with implant group demonstrated a relatively big stress in mandible, which was 4.01% lower compared with that of the control group. Dental Bridge would be an effective means of recovering Dental performance. However, the present research stated that the implant of Dental Bridge has a potential to increase abnormal stress, and uniformly distributing stress in the Dental Bridges.

Bikramjit Basu - One of the best experts on this subject based on the ideXlab platform.

  • Periprosthetic biomechanical response towards Dental implants, with functional gradation, for single/multiple Dental loss.
    Journal of the mechanical behavior of biomedical materials, 2019
    Co-Authors: Subhomoy Chatterjee, Sulagna Sarkar, Surya R. Kalidindi, Bikramjit Basu
    Abstract:

    Abstract The differences in shape and stiffness of the Dental implants with respect to the natural teeth (especially, Dental roots) cause a significant alteration of the periprosthetic biomechanical response, which typically leads to bone resorption and ultimately implant loosening. In order to avoid such clinical complications, the implant stiffness needs to be appropriately adapted. In this study, hollow channels were virtually introduced within the designed implant screws for reduction of the overall stiffness of the prototype. In particular, two opposing radial gradients of increasing hollow channel diameters, i.e., outside to inside (Channel 1) and inside to outside (Channel 2) were considered. Two clinical situations of edentulism were addressed in this finite element-based study, and these include a) loss of the first molar, and b) loss of all the three molars. Consequently, two implantation approaches were simulated for multiple teeth loss - individual implantation and implant supported Dental Bridge. The effects of implant length, approach and channel distribution on the biomechanical response were evaluated in terms of the von Mises stress within the interfacial periprosthetic bone, under normal masticatory loading. The results of our FE analysis clearly reveal significant variation in periprosthetic bone stress between the different implant designs and approaches. An implant screw length of 11 mm with the Channel 2 configuration was found to provide the best biomechanical response. This study also revealed that the implant supported Dental Bridge approach, which requires lower bone invasion, results in favorable biomechanical response in case of consecutive multiple Dental loss.