Title: 2972 - Social-inequalities in Insurance Covered Versus Non-Covered Prosthodontic Services in Japan


Hazem Abbas (Presenter)
Tohoku University

Jun Aida, Tohoku University
Ken Osaka, Tohoku University


Objectives: In Japan, the universal dental insurance scheme covers conventional removable and fixed dental prothesis but does not cover dental implant-supported prothesis. We examined social inequalities in three prosthodontic services; two covered (conventional removable and fixed prothesis) and one non-covered (implant-supported prothesis).

Methods: In 2016, a self-reported questionnaire was mailed to residents aged 65 years or older living in 39 different municipalities across Japan as a part of the ongoing Japan Gerontological Evaluation Study (JAGES project). We used data from 58,232 respondents having 19 or fewer teeth. Logistic regression analysis estimated the association of these three services with years of formal education. Covariates used were age, sex, and number of remaining teeth.

Results: Mean age of participants was 75.1 years (SD± 6.5). 52.2% were men and 47.7% were women. 79.6% used conventional-removable-prosthesis, 11.5% used conventional-fixed-prosthesis and 3.3% used implant-supported-prosthesis. More women had conventional-fixed-prosthesis and implant-supported-prothesis while more men had conventional-removable-prosthesis. Younger age groups had more conventional-fixed-prosthesis and implant-supported-prothesis compared to older age groups. In the fully adjusted models, odds ratios of the highest educated group (≥13 years of formal education) compared to the lowest educated group (≤9 years of formal education) for conventional-fixed-prosthesis, conventional-removable-prosthesis, and implant-supported-prosthesis were 1.16 (1.08-1.24), 1.13 (1.07-1.20), and 2.65 (2.33-3.01), respectively.

Conclusions: Among older people with fewer remaining teeth, social inequalities in dental prosthesis use were observed. The inequalities were relatively smaller for insurance covered prosthesis than that of non-covered.

Student Presenter

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: none