[A comparative study for the permanent teeth decay between Shanghai and Osaka citizens]

ABSTRACT

OBJECTIVE:The aim of present research is observing and comparing the incidence of the permanent teeth decay between Shanghai and Osaka citizens.The representative samples of 3819 people in Shanghai and 484 people in Osaka received dental examination in 1996 and in 1993.The ages range of the subjects were form 5 to 74 years old in the research.The subject's caries experience was gained from average DMFT and the incidence of the permanent teeth decay.The condition of the caries,treatment of the subjects was also recorded by examiners.The result showed that the caries incidence of the permanent teeth is 59.82% in Shanghai people and 92.77% in Osaka people.The mean DMFT of Shanghai people are much lower than that of Osaka people.The research also indicated that the mean sound teeth of the citizens between Shanghai and Osaka people is different. It is 21.74% in Shanghai people and 12.21% in Osaka people.The statistical results showed that the condition of the caries treatment in Shanghai people differs greatly from that in Osaka people.32.61% of the patients whose caries have been filled are found in Shanghai,but 52.99% of the patients are found in Osaka.It is indicated that the oral health must be raising in over 50 years old patients,especially in Shanghai city.