• Imaging Science in Dentistry
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• v.43 no.4
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• pp.219-225
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• 2013

Purpose: The purpose of this study was to determine the prevalence of missing and impacted third molars in people aged 25 years and above. Materials and Methods: The study sample of 3,799 patients was chosen randomly from patients who visited Pusan National University Dental Hospital and had panoramic radiographs taken. The data collected included presence and impaction state, angulation, and depth of impaction of third molars, and radiographically detected lesions of third molars and adjacent second molars. Results: A greater percentage of men than women retained at least one third molar. The incidence of third molars decreased with increasing age. The incidence of partially impacted third molars greatly declined after the age of 30. Vertically impacted maxillary third molars and horizontally impacted mandibular third molars were most frequent in all age groups. Among the maxillary third molars, those impacted below the cervical line of the second molar were most frequent in all age groups, and among the mandibular third molars, deeply impacted third molars were most frequent in those aged over 40. Dental caries was the most common radiographic lesion of the third molars. Mesioangularly impacted third molars showed radiographic lesions in 13 (9.5%) adjacent maxillary second molars and 117 (27.4%) mandibular second molars. Conclusion: The number of remaining third molars decreased and the percentage of Class C depth increased with age. Caries was the most frequent lesion in third molars. Partially impacted mesioangular third molars showed a high incidence of caries or periodontal bone loss of the adjacent second molar. Regular oral examination will be essential to keep asymptomatic third molars in good health.

• Journal of the korean academy of Pediatric Dentistry
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• v.29 no.3
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• pp.318-327
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• 2002

The purpose of this study was to make a comprehensive study and to provide information about the dental caries and plaque index of cerebral person, and to aid improvement of their oral health. The author examined intraorally 1180 deciduous teeth, 5626 permanent teeth of 264 (male:153 female:111) cerebral palsy person and 1526 deciduous teeth, 4140 permanent teeth of 220 (male:125 female:95) non cerebral palsy person as the control group. The results were as follows : 1. Cerebral palsy persons Had higher dft rate than non-cerebral palsy persons. 2. Dental caries incidence between males and females in cerebral palsy persons showed no difference, and dental caries incidence of types in cerebral palsy person showed no difference, either. 3. Mental, motor, speech handicap degrees were negatively related to DMFT rate and DMFT index, and institutionalized cerebral palsy persons and cerebral palsy persons of which parent's occupation is private business were found low DMFT rate and DMFT index. 4. Cerebral palsy persons were found to have higher plaque index than non-cerebral palsy persons, and non institutionalized cerebral palsy persons and self-supported cerebral palsy persons were found high plaque index. 5. Plaque index of male and female in cerebral palsy person showed no difference, and Plaque index of types in cerebral palsy person showed no difference, either Plaque index of handicap degrees(mental, motor, speech) showed no difference.

• Journal of Food Hygiene and Safety
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• v.14 no.1
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• pp.22-26
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• 1999

The purpose of this experiment was to examine the antimicrobial effect of the natural flavonoid hesperidin on dental caries and alveolar bone resorption in the albinorats. Twenty five day old male rats were fed with the experimental diets for 42 days. At the end of the 42 day experimental period, the molar tooth occlusal surface was examined by a dissecting microscope. The sulcular caries lesions were recorded: the first molar caries incidence was higher than that of the second molar and the third molar. Alvelolar bone resorption was measured on the buccal and lingual aspects of each molars. Three measurements were taken on the first molar (mesialpoint, midpoint, distalpoint). The results of this experiments, showed that hesperidin is effective in reducing dental caries and alveolar bone resorption.

• Journal of dental hygiene science
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• v.12 no.2
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• pp.79-84
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• 2012

The purpose of this study was to utilize it as useful basic data for improving oral health and for developing educational guidelines, by surveying the intake frequency in cariogenic food and the dietary intake status in detergent food through dietary life diary of some female undergraduates, and by researching into relationship between dietary intake factor and dental caries. It allowed dietary life diary for 5 days to be recorded targeting female undergraduates for the Dept. of Dental Hygiene, selected dietary life diary of 66 people without omission of record, and used it in this study. The following conclusions were obtained. 1. As a result of surveying the food intake status, it was indicated to be 12.82 for cariogenic food intake frequency, 256.36 for caries incidence available time and 8.32 for detergent food intake frequency. 2. As a result of surveying in order to examine relationship between cariogenic food intake frequency, detergent food intake frequency & cariogenic light-meal intake frequency and dental caries by dividing group with caries and group with non-caries, the group with caries was indicated to be a little higher than the group with non-caries. However, statistically significant difference wasn't indicated. 3. In the correlation between dietary intake status and dental caries, it was indicated that the more rise in cariogenic food intake frequency leads to the more rise in detergent food intake frequency and even in total light-meal intake frequency, but wasn't shown correlation with dental caries. In light of the above results, many limitations were indicated in finding and analyzing the dental caries incidence level and cause just with a method through surveying dietary intake. However, given the more in cariogenic food intake frequency and detergent food intake frequency, the possibility of dental caries incidence could be predicted.

• The Journal of the Korean dental association
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• v.11 no.10
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• pp.643-647
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• 1973

The auther has made the oral examination of 523 pregnant women-such as calculus, gingival disease, periodontal disease, and dental caries-who visit the dental department and obstetric department in National Medical Center in Seoul. After the above studies, results of the changes of the pregnant women's oral condition are following. 1. In creasing of calculus deposition due to the changes of saliva components. 2. Increasing of incidence of gingival and periodontal and pathological changes followed by calculus deposition. 3. Incidence of new cavities are not related to the pregnancy, but old cavities have become more progressive in dental caries.

• The Journal of the Korean dental association
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• v.23 no.7 s.194
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• pp.617-624
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• 1985

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.2
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• pp.233-239
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• 2016

This study compared and analyzed the tooth brushing time per day and dental caries in 1-13-year-old children in the stage of the completion of their permanent teeth based on the 6th primitive at data of objective National Health Nutrition Survey. The results show a meaningful difference between the DMFT and dental caries experience. In particular, the group with a lower toothbrushing rate after lunch generally have a higher incidence of dental caries.

• Journal of the korean academy of Pediatric Dentistry
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• v.23 no.2
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• pp.389-400
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• 1996

In Class II amalgam restoration in deciduous molar, failure rate and incidence of recurrent caries are high as children become older. In order to preserve deciduous molars till the physiologic exfoliation time, stainless steel crown is a choice of the treatment. As a result of a careless treatment, such as overhanging margin, poor marginal adaptation, poor proximal contour and inadequate mesiodistal width give rise to interfering eruption of the adjacent teeth, recurrent caries and chronic gingival irritation and insufficient arch length respectively. In this study, 252 s.s. crowned teeth extracted due to physiologic exfoliation or periapical lesion. The purpose of this study is to analyze the marginal adaptation of stainless steel crown to the deciduous molar in order to obtain better clinical result. The results were as follows : 1. Between the length of s.s. crown and the marginal gap of crown, positive correlations were shown. 2. Largest amount of marginal gap was shown at buccal side in upper deciduous molars and lower first deciduous molar, lingual side in lower second deciduous molar. But no significant diffrence were found statistically compared to second most largest one. 3. Incidence of exposed restoration and recurrent caries were higher in proximal surface than buccal/lingual surface. And extension of restoration below the margin of s.s. crown gives rise to higher rate of recurrent caries. 4. Defect of contour was found in 34%, frequently found in lower 1st deciduous molar and upper 1st deciduous molar. 5. Marginal polishing defects were found in 23%. 6. Ledge was formed in 10% especially in lower 1st deciduous molar and lower 2nd deciduous molar. 7. 16% of the teeth had wear facet due to traumatic occlusion, 7% of them had occlusal perforation.

• Journal of Korean Academy of Oral Health
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• v.42 no.4
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• pp.136-144
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• 2018

Objectives: The aim of this study is to analyze the differences in factors related to the incidence of dental caries between children in fluoridated and non-fluoridated areas and compared the DMFT and DMFS scores to confirm the effect of water fluoridation program (WFP) in Geoje and Changwon. Methods: The oral health examination and questionnaire survey were conducted in fluoridated and non-fluoridated areas. The number of surveyed children aged 8, 10, and 12 years in the fluoridated and non-fluoridated area of two cities was 1,524 and 1,383, respectively. Self-recorded questionnaires included self-perception of their own dental health, daily toothbrushing frequency, intake frequency of cariogenic sweet snacks and beverages, experience of gingival bleeding, experience of unmet dental treatment, and use of oral hygiene device except for toothbrush and toothpaste. The prevalence of caries and fissure-sealant status were surveyed. The logistic regression analysis was used to analyze the difference in children's self-rated oral health status between the fluoridated and non-fluoridated area. The mean number of sealed teeth and surfaces, marginal means of the DMFT and DMFS scores adjusted for the difference in the samples' sex distribution, and region were compared between the fluoridated and non-fluoridated areas. Results: In the fluoridated area, the experience rate of unmet dental treatments was higher among children aged 10 years, intake frequency of cariogenic sweet snacks and beverages were higher among the whole sample, and experience rate of professional fluoride application were lower than in the non-fluoridated area. The DMFT score for permanent dentition adjusted for differences in sex, region, and mean number of fissure-sealed teeth in the fluoridated area was significantly lower among whole samples and 8-, 10-, and 12-year-olds alone than in the non-fluoridated area. Conclusions: WFP can alleviate oral health inequality because it is effective in reducing the incidence of caries among children is disadvantaged demographic, socioeconomic, and cultural contexts.

• Journal of Korean society of Dental Hygiene
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• v.15 no.1
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• pp.119-127
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• 2015

Objectives: The purpose of the study is to investigate the relationship between dental caries and oral health behaviors in middle and high school students by web-based survey of the ninth(2013) Korean youth risk behavior. Methods: The subjects were 75,149 students from 400 middle schools and 400 high schools. Finally, the survey participation rate was 96.4%(72,435 students from 799 schools) by complex sample design. The questionnaire consisted of general characteristics of the subjects, oral health behaviors, and oral health status. General characteristics included gender, types of schools, economic condition, and residential types. Oral health behaviors included subjective oral health condition, frequency of tooth brushing, tooth brushing after meal within recent 7 days, sealant within 12 months, fluoride application within 12 months, scaling within 12 months, and oral health education experience within 12 months. Oral health condition included dental caries incidence within 12 months. Results: Oral health behavior influenced on dental caries in the middle and high school students in Korea. This study showed the relationship between the sociodemographic characteristics, tooth brushing frequency, sealant experience, dental caries and halitosis experience, and scaling within 12 months. Scaling is the best prevention method for dental caries and halitosis in the students. Conclusions: The study showed the necessity for practical oral health education and the effect of fluoride application for dental caries prevention.