Association of environmental factors with dental caries and periodontitis

학위논문(박사)--서울대학교 대학원 :치의학과,2008.2.Docto

근관치료용 파일의 위치결정시 판독실 조명 및 디지털방사선영상의 비트수가 판독자 수행능에 미치는 효과

Thesis(master`s)--서울대학교 대학원 :치의학과 구강악안면방사선학전공,2005.Maste

One-year Longitudinal study on the related factors of the caries increment

Objectives: 'The purpose of this study was to analyse the related factors to the caries increment. Methods: The subjects were 249 elementary school students. Among them, the number of male students was 137(55.0%). In the first year, all subjects gave the responses of the questionnaire composed of demographic variables and oral heath behaviors. They also received oral examination and tests of Dentocult SM and Dentocult LB. In the second year, they received second oral examination. the relation of oral health-related factors with caries increment was analyzed by chi-square test and crude and adjusted Relative Risk(RR). Results: The caries experience rate of subjects eating snacks one or more dimes a day was 2.6 times higher than the other subjects. The caries experience rate might be higher an a group determined by Dentocult LB as Class 2 and over(adjusted RR=2.3) than the other group. The caries experience rate of a group who had thee or more primary molars affected by caries might be 2.5 times higher than the other group. Conclusions: It was suggested that the caries increment be related to the frequency of eating snacks, Lactobacillus in saliva and caries on deciduous molars.본 연구는 2004년도 부산대학교 교내학술연구비(신임교수연구정착금)에 의한 연구임

Relationship between perceived oral symptoms and perceived oral health status among the elderly in welfare institutions in Seoul

Objectives: The purpose of this study was to evaluate the relationship between perceived oral symptoms(P0S) and perceived oral health(P0H) status among the elderly in Seoul. Methods: All 443 subjects aged 60 or more in 6 welfare institutions selected using cluster sampling were surveyed cross-sectionally the self-reporting questionnaire. All 443 subjects provided written informed consents of the Seoul National University Dental Hospital Institutional Review Boards. The questionnaires consisted of POH(a dependent variable) and 8 POS(main explanatory variables) and socio-economic characteristics and perceived general health, smoking and drinking(conf0unding variables). For crude relationships, bivariate analysis such as chi-square, ANOVA, correlation analysis were used. For adjusted relationships, multivariate linear regression analysis were applied. Results: Sixty percent of the elderly perceived oral health that their was poor or very poor. Trouble bitinglchewing, periodontal status and toothache were significantly associated with POH. Trouble bitinglchewing showed the highest impact of association with POH(β= 0.3). Conclusions: POS such as trouble bitinglchewing, periodontal status and toothache had clear relationships with POH on the elderly. Oral health promotion in the elderly in welfare institutions in seoul should be focused on trouble bitingichewing, periodontal disease and dental caries with priority

Effect of fluoride varnish on fluoride ion concentration in the dental plaque

Objectives:The aim of this syudy was to evaluate the effect of fluoride varnish on the concentrations of fluoride in dental plaque after fluoride varnish and gel treatment from preschool children. Methods: Children between the ages of 5 and 6 who lived in non-fluoridated areas were enrollde in this study. After dental examination, informed consent was received from the parents. The effect of a fluoried vamish and 1.23%APFgel on the concentrations onfluoried in dental plaque were investigated in 5,6-years old preschool children(N=59)after fluoride varnish and 1.23%APF gel treatment. Results: Children between the ages of 5 and 6 who lived in non-fluoridated areas were cnrolled in this study. After dental examination, informed consent was received from the parents. The effect of a fluoried varnish and 1.23%APF gel on the concentrations of fluoried in dental plaque were investigated in 5, 6-years old preschool children(N=59) after fluoride varnish and 1.23%APF gel treatment. Results: The concentration of fluoride in dental plaque after fluoride varnish treatment was kdpt higher than 1.23%APF gel after 1 week(p < 0.05). Conclusions: The fluoride varnish showed higher fluoride ion concentration in dental plaque than 1.23%APF gel and can be used as a broady available anticaries agent.학술진흥재단 기초과학연구지원사업(KRF-2002-015-EP0119

The Effect of Adjusted Water Fluoridation on Bone Mineral Density

Adjusted water fluoridation has been disputed because of its various effects on human health. Previous studies have been concerned with the difference in bone mineral density (BMD) between water fluoridated (WF) and none water fluoridated (NWF) districts. The aim of this study is to examine whether water fluoridation affects BMD. BMD was measured by dual energy X-ray absorptiometry (DXA). 386 adults(174 males and 212 females) in Ansan (WF) district and 399 adults (176 males and 223 females) in Sihwa (NWF) district, participated in this study. The Ansan and Sihwa districts are similar in residential environment and living class. The relationship between serum fluoride concentration and BMD was also examined by analysis of the serum fluoride concentrations from 402 inhabitants of the Ansan district. In females, the BMD of subjects living in Ansan () was a little higher than that of Sihwa subjects (), although it is not significant, after adjusting for BMI, physical activity level, educational achievement, smoking volume, menopause status, and number of births. However, the BMD of Ansan subjects () in their forties was statistically higher than that of Sihwa (0.498{\pm}0.019). No relationship was found in males. In residential periods, there was significant difference (Ansan , Sihwa , p=0.0125) in the BMD between females of two districts, particularly in the group of over 6 year long-term inhabitants. On the contrary, there was no remarkable difference in males from the two districts. Serum fluoride concentrations in females were associated with BMD, especially in the age group of forties (p=0.0457). No relationship was observed in the male group. Analysis of adult BMD over the age of 20 in a water fluoridated and a none water fluoridated district, confirms more or less a higher BMD in the water fluoridated (WF) district, especially for females. It is assumed that the difference between two districts came somewhat from the effect of water fluoridation