[Investigation of deciduous teeth caries in children under 14-year-old].

OBJECTIVE: To investigate the caries prevalence of children under 14-year-old in three districts (Nanshi,Luwan,Xuhui) of Shanghai. To provide the first-hand data for prevention of children caries. METHODS: The standard of second whole national investigation regime of oral epidemic disease was used. RESULTS: When the children grow up,the caries incidence and dft increased. In 7-year-old group the values were 83.33% and 3.78,respectively. After that the values decreased for the alternation of deciduous teeth and permanent teeth. The caries incidence was almost the same in boys and girls. The caries incidence in lower jaw was higher than that in upper jaw. The caries incidence was highest in lower jaw D and E. The lowest caries incidence was found in lower jaw A and B. The incidence and dft decreased compared with before. At the same time, the filling rate of deciduous teeth also decreased. CONCLUSION: The oral hygiene knowledge for children is disseminated. It is important for children to find a solution to improve the filling rate of deciduous caries.

[A caries survey in Shanghai Penglai district]

OBJECTIVE: Investigate the oral epidemic disease occurance to get the essential data and provide the standard for supervising the result of education of oral health and the measures of oral epidemic disease probation.METHODS:Random sample by equal proportion and divide into groups.The standard of second whole national investigation of oral epidemic disease is accepted in this investigation.RESULTS:The caries prevalence rate are:5 year old group 63.1% 12 year-old group 28.6% 15 year-old group 31.8%,18 year-old group 43.6%,35-44 year-old group 41.3%,65-74 year-old group 61.8%.CONCLUSION:This statistics states:(1)The rates of caries have distinguish differences between different age groups.(2)The caries prevalence rate and the DMFT is rather less than the result of Shanghai area which join the second whole national investigation of oral epidemic disease.

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

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.

[The clinical effects of tea polyphenol varnish on caries prevention]

The aim of the present research is observing the effects of tea polyphenol varnish on caries prevention.107 children were in treated group,their first deciduous molars and deciduous incisors were treated by tea polyphenol varnish twice each.Other 110 children in control group did not receive any treatment.Two doctors examined their dental caries and recorded dmft and dmfs befoe treated and one year after treatment.The results indicate that the new caries incidence of the first deciduous molars and deciduous incisors in treatment group decreased 66% than that in control group.The results show that the new caries incidence of other untreated teethin treated group is lower significantly than that in control group.The effects of tea polyphenol varnish on preventing caries were more significant in deciduous molar than in deciduous incisor.The results also indicate that the effect of varnish is stronger in occlusal surface,and less in medial and distal surfaces of teeth.