| Objective: Dental Caries,is a multifactorial infectious disease that products chronic, progressively irreversible lesions of teeth tissue. It is one of the most common diseases, which is ranked as the third world's disease following cardiovascular diseases and cancers by the World Heath Organization (WHO). As an irreversible lesion, dental caries can be controlled only by using effective treatment methods, otherwise will result in unendurable pain, severe oral inflammation, dentine damage or even other organs' complaints. But a lot of medical practices and researches indicate that taking treatment measures can not solve people's all foundational oral heath problems, so WHO set up a series of policy to place emphasis on preventions of dental disease rather than supplying a mainly restorative service. WHO has recommended and stressed the importance and essentiality to collecting epidemiological data concerning dental heath and morbidity among all aged people in global scope, meantime, WHO has definitely regulated the clinical diagnostic criteria regarding to dental caries epidemic survey method.In order to update the knowledge on prevalence in dental caries and associated variables among Adolescents in Taiyuan, asystematic epidemiological survey on caries prevalence has been conducted. The survey is a cross-sectional one that combines questionnaire with clinical examination. It aims to get some important data on caries prevalence status among children in Taiyuan city, help promote and improve the present program on caries prevention. In addition, it will be a persuasive original data, which can be reserved for further research. Methods: The survey is a crdss-sectional study that combines questionnaire with clinical examination. It is a systematic epidemiological survey on caries prevalence among adolenscents in Taiyuan City in 2002, which belongs to stratified cluster random sampling epidemiological survey. In the study, adolescents at the age of 12 and 15 at middle schools in Taiyuan city in 2002 were randomly sampled (n=3087). All selected samples were given questionnaires and accepted clinical examination. Decayed, missing, filled teeth score (DMFT) was clinically recorded. Decayed teeth were scored as "D'. Missing teeth were scored as "M", if the tooth has been extracted due to caries. Filled teeth were scored as "F", if the tooth has been extracted due to caries. Data on children's home-based and professional dental health habits were registered. SPSS software for Windows on a personal computer as a kind of statistical method was used to analyze data.1. SamplesThe age of 12 and 15 was chosen , because it is monitoring age recommended to be used in a pathfinder survey by WHO. Because majority children at the age of 12 and 15 are students at middle schools, two middle schools were selected at random principle from every district , county and city of Taiyuan City, amount to 18 schools (represent 7.39% middle schools in Taiyuan city). All students at the age of 12 and 15 of these selected schools participated in the sample in the study (n-3087, among them 12-year-olds 1488,15-year-olds 1599).2. QuestionnaireDelivering tow different questionnaires to selected children and their parents. Every questionnaire was completed and submitted in a given schedule. Ensure validity of every questionnaire. In the study, the children's parents were asked to answer questionnaires separately in order to test the reliability of children's answers to questionnaires. The contents of questionnaire include personal oral health care knowledge, attitude, practice, habits and perception in children.3. Clinical Examination10 qualificaed examiners were distributed to the selected schools to conduct clinical examination. According to the diagnostic criteria regarding to dental caries by WHO, allchildren were examined at school clinics using traditional oral equipments-plain surface mirror, sickled-shaped explorer with natural illumination. The examination included recording of (1) number of teeth with...
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