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Ken Osaka - One of the best experts on this subject based on the ideXlab platform.

  • inequalities of Dental Prosthesis use under universal healthcare insurance
    Community Dentistry and Oral Epidemiology, 2014
    Co-Authors: Yusuke Matsuyama, Jun Aida, Kenji Takeuchi, Georgios Tsakos, Richard G Watt, Katsunori Kondo, Ken Osaka
    Abstract:

    Background: Social inequalities in oral health exist in various countries. In Japan, a country with universal healthcare insurance policy, people can receive medical and Dental care and pay only 10-30% of the total cost of treatment. Additionally, very poor Japanese can receive care without any charge, by the benefit of public assistance. These policies are considered to affect oral health inequalities. Objectives: This study examined the association between using a Dental Prosthesis and household income among older Japanese people. Methods: Self-administered questionnaires were mailed to subjects as part of the Japan Gerontological Evaluation Study (JAGES) project in 2010. Of the 8576 people aged 65 years or more living in Iwanuma, Japan, 5058 responded. We used 4001 respondents with no missing values. We stratified into two groups by having 20 teeth or not. Then, cross-tabulation, univariate logistic regression, and multivariate logistic regression were conducted for these two groups. The covariates are sex, age, education, and size of household. Results: Of the all respondents included in the analyses, poorer respondents tended to have lower proportions with 20 or more teeth, and 54.6% respondents used Dental prostheses. In the respondents with 19 or fewer teeth, higher-income group tended to show significantly higher Dental Prosthesis use. But the poorest income group showed high prevalence of Dental Prosthesis use as same as highest income group. Multiple logistic regression among respondents with 19 or fewer teeth showed that after adjustment for sex, age, education, and size of household, compared with the respondents with annual incomes of US$ <5000, those with incomes of US$5000-9999 and US$10 000- 14 999 had significantly lower odds ratios for using a Dental Prosthesis (OR = 0.48 (95% CI = 0.28-0.83), 0.56 (95% CI = 0.33-0.95), respectively). The other respondents did not show significant differences. Conclusions: Although universal healthcare insurance covered Dental prostheses, a social gradient in Dental Prosthesis use was still observed. Low-income respondents tended to not use Dental Prosthesis, but the poorest respondents showed Dental Prosthesis utilization as high as the highest income group.

  • Inequalities of Dental Prosthesis use under universal healthcare insurance
    Community Dentistry and Oral Epidemiology, 2013
    Co-Authors: Yusuke Matsuyama, Jun Aida, Kenji Takeuchi, Georgios Tsakos, Richard G Watt, Katsunori Kondo, Ken Osaka
    Abstract:

    Background: Social inequalities in oral health exist in various countries. In Japan, a country with universal healthcare insurance policy, people can receive medical and Dental care and pay only 10-30% of the total cost of treatment. Additionally, very poor Japanese can receive care without any charge, by the benefit of public assistance. These policies are considered to affect oral health inequalities. Objectives: This study examined the association between using a Dental Prosthesis and household income among older Japanese people. Methods: Self-administered questionnaires were mailed to subjects as part of the Japan Gerontological Evaluation Study (JAGES) project in 2010. Of the 8576 people aged 65 years or more living in Iwanuma, Japan, 5058 responded. We used 4001 respondents with no missing values. We stratified into two groups by having 20 teeth or not. Then, cross-tabulation, univariate logistic regression, and multivariate logistic regression were conducted for these two groups. The covariates are sex, age, education, and size of household. Results: Of the all respondents included in the analyses, poorer respondents tended to have lower proportions with 20 or more teeth, and 54.6% respondents used Dental prostheses. In the respondents with 19 or fewer teeth, higher-income group tended to show significantly higher Dental Prosthesis use. But the poorest income group showed high prevalence of Dental Prosthesis use as same as highest income group. Multiple logistic regression among respondents with 19 or fewer teeth showed that after adjustment for sex, age, education, and size of household, compared with the respondents with annual incomes of US$

Belabbes Bachir Bouiadjra - One of the best experts on this subject based on the ideXlab platform.

  • Finite element analysis in static and dynamic behaviors of Dental Prosthesis
    Structural Engineering and Mechanics, 2015
    Co-Authors: N Djebbar, Boualem Serier, Belabbes Bachir Bouiadjra
    Abstract:

    In recent years, implants have gained growing importance in all areas of medicine. The success of the treatment depends on many factors affecting the bone-implant, implant abutment and abutment Prosthesis interfaces. In this paper, static and dynamic behaviors of the Dental Prosthesis are investigated. Three-dimensional fmite element models of Dental Prosthesis were constructed. Dynamic loads in 5 sec applied on occlusal surface. Therefore, FEA was selected for use in this study to examine the effect of the static and dynamic loads on the stress distribution for an implant-supported fixed partial denture and supporting bone tissue.

  • stress distribution in Dental Prosthesis under an occlusal combined dynamic loading
    Materials & Design, 2012
    Co-Authors: Ali Merdji, Boualem Serier, Belabbes Bachir Bouiadjra, Ould B Chikh, Rajshree Mootanah, L Aminallah, Iyad Muslih
    Abstract:

    Abstract The biomechanical behavior of osseointegrated Dental prostheses systems plays an important role in its functional longevity inside the bone. Simulation of these systems requires an accurate modeling of the Prosthesis components, the jaw bone, the implant–bone interface, and the response of the system to different types of applied forces. The purpose of this study was to develop a new three-dimensional model of an osseointegrated molar Dental Prosthesis and to carry out finite element analysis to evaluate stress distributions in the bone and the Dental Prosthesis compounds under an occlusal combined dynamic load was applied to the top of the occlusale face of the Prosthesis crown. The jaw bone model containing cortical bone and cancellous bone was constructed by using computer tomography scan pictures and Computer Aided Design tools. The Dental Prosthesis compounds were constructed, simulating the commercially available cylindrical implant of 4.8 mm diameter and 10 mm length. Both finite element models were created in Abaqus finite element software. All materials used in the models were considered to be isotropic, homogeneous and linearly elastic. The elastic properties, loads and constraints used in the model were taken from published data. Results of our finite element analyses, indicated that the maximum stresses were located around the mesial neck of the implant, in the marginal bone. Thus, this area should be preserved clinically in order to maintain the bone–implant interface structurally and functionally.

  • stress analysis in Dental Prosthesis
    Computational Materials Science, 2010
    Co-Authors: Ali Merdji, Boualem Serier, Belabbes Bachir Bouiadjra, T Achour, Ould B Chikh, Z O Feng
    Abstract:

    Dental implant has been used and studied for the replacement of missing teeth for many years. It has been well known that the success of Dental implant is heavily dependent on initial stability and long-term osseointegration due to optimal stress distribution in the surrounding bones. In this study, the 3D finite element analysis is used o study the stresses distribution in Dental Prosthesis under different loading cases. The von Mises stress distribution indicated that stress was maximal around the top of the implant with varying intensities in the different loading cases. The stress was highest in the cortical bone at the neck of implant and lowest in the cancellous bone.

Yusuke Matsuyama - One of the best experts on this subject based on the ideXlab platform.

  • inequalities of Dental Prosthesis use under universal healthcare insurance
    Community Dentistry and Oral Epidemiology, 2014
    Co-Authors: Yusuke Matsuyama, Jun Aida, Kenji Takeuchi, Georgios Tsakos, Richard G Watt, Katsunori Kondo, Ken Osaka
    Abstract:

    Background: Social inequalities in oral health exist in various countries. In Japan, a country with universal healthcare insurance policy, people can receive medical and Dental care and pay only 10-30% of the total cost of treatment. Additionally, very poor Japanese can receive care without any charge, by the benefit of public assistance. These policies are considered to affect oral health inequalities. Objectives: This study examined the association between using a Dental Prosthesis and household income among older Japanese people. Methods: Self-administered questionnaires were mailed to subjects as part of the Japan Gerontological Evaluation Study (JAGES) project in 2010. Of the 8576 people aged 65 years or more living in Iwanuma, Japan, 5058 responded. We used 4001 respondents with no missing values. We stratified into two groups by having 20 teeth or not. Then, cross-tabulation, univariate logistic regression, and multivariate logistic regression were conducted for these two groups. The covariates are sex, age, education, and size of household. Results: Of the all respondents included in the analyses, poorer respondents tended to have lower proportions with 20 or more teeth, and 54.6% respondents used Dental prostheses. In the respondents with 19 or fewer teeth, higher-income group tended to show significantly higher Dental Prosthesis use. But the poorest income group showed high prevalence of Dental Prosthesis use as same as highest income group. Multiple logistic regression among respondents with 19 or fewer teeth showed that after adjustment for sex, age, education, and size of household, compared with the respondents with annual incomes of US$ <5000, those with incomes of US$5000-9999 and US$10 000- 14 999 had significantly lower odds ratios for using a Dental Prosthesis (OR = 0.48 (95% CI = 0.28-0.83), 0.56 (95% CI = 0.33-0.95), respectively). The other respondents did not show significant differences. Conclusions: Although universal healthcare insurance covered Dental prostheses, a social gradient in Dental Prosthesis use was still observed. Low-income respondents tended to not use Dental Prosthesis, but the poorest respondents showed Dental Prosthesis utilization as high as the highest income group.

  • Inequalities of Dental Prosthesis use under universal healthcare insurance
    Community Dentistry and Oral Epidemiology, 2013
    Co-Authors: Yusuke Matsuyama, Jun Aida, Kenji Takeuchi, Georgios Tsakos, Richard G Watt, Katsunori Kondo, Ken Osaka
    Abstract:

    Background: Social inequalities in oral health exist in various countries. In Japan, a country with universal healthcare insurance policy, people can receive medical and Dental care and pay only 10-30% of the total cost of treatment. Additionally, very poor Japanese can receive care without any charge, by the benefit of public assistance. These policies are considered to affect oral health inequalities. Objectives: This study examined the association between using a Dental Prosthesis and household income among older Japanese people. Methods: Self-administered questionnaires were mailed to subjects as part of the Japan Gerontological Evaluation Study (JAGES) project in 2010. Of the 8576 people aged 65 years or more living in Iwanuma, Japan, 5058 responded. We used 4001 respondents with no missing values. We stratified into two groups by having 20 teeth or not. Then, cross-tabulation, univariate logistic regression, and multivariate logistic regression were conducted for these two groups. The covariates are sex, age, education, and size of household. Results: Of the all respondents included in the analyses, poorer respondents tended to have lower proportions with 20 or more teeth, and 54.6% respondents used Dental prostheses. In the respondents with 19 or fewer teeth, higher-income group tended to show significantly higher Dental Prosthesis use. But the poorest income group showed high prevalence of Dental Prosthesis use as same as highest income group. Multiple logistic regression among respondents with 19 or fewer teeth showed that after adjustment for sex, age, education, and size of household, compared with the respondents with annual incomes of US$

Paulo Francisco Cesar - One of the best experts on this subject based on the ideXlab platform.

  • Chipping of Veneering Ceramics in Zirconium Dioxide Fixed Dental Prosthesis
    Current Oral Health Reports, 2015
    Co-Authors: Erick Lima, Josete Barbosa Cruz Meira, Mutlu Ozcan, Paulo Francisco Cesar
    Abstract:

    Clinical studies to date reported high survival rates with fixed Dental Prosthesis (FDPs) made of yttria partially stabilized zirconia (Y-TZP). Yet, the veneering ceramic layer that is responsible for the final optical outcome and anatomy of the FDP, with lower mechanical properties than Y-TZP, continues to exhibit high chipping rate. This clinically undesirable situation, which is in fact the failure of the system, may interfere with appearance and function and be costly in cases of early failures. Since understanding the factors related to veneer ceramic chipping may diminish such clinical failures, this review presents information on the mechanical and microstructural characteristics of veneering ceramics, challenges posed onto this material in the oral environment, mechanisms of generation of thermal residual stress profiles during cooling in bilayered FDPs, and process-related issues to circumvent chipping.

Dean Morton - One of the best experts on this subject based on the ideXlab platform.