The prevalence of dental caries has been decreasing among kindergarten children in Shanghai, China, over recent years, although it still remains at an unacceptably high level. The purpose of this study was to identify which factors were important in providing oral health guidance and achieving further improvement in the oral health status of kindergarten children in urban China. A survey was conducted on dental caries in 128 Japanese and 368 Chinese kindergarten children and a questionnaire given to their parents/guardians on each child's lifestyle and dietary habits from birth to the present. Correlations between responses to each questionnaire item and the status of dental caries were statistically analyzed. The dft index score (p=0.0016), prevalence of dental caries (p=0.0002), and percentages of children with decayed (untreated caries-affected) teeth (p<0.0001) were significantly higher in the Chinese than in the Japanese children. Many differences were observed in lifestyle factors between the two groups. The percentage of parents failing to control the child's snacking habits between meals was higher in China, and weaning was significantly delayed in China compared with in Japan. These lifestyle factors were considered to be associated closely with the high risk of dental caries in Chinese kindergarten children. These findings indicate that oral health guidance for kindergarten children in Shanghai, China, should focus on control of dietary habits, including control of inter-meal snacking, and breastfeeding practices. The results of this study may help improve the status of dental caries among Chinese children.
We present three cases of marginal periodontitis with alveolar bone loss due to the presence of a drinking straw-like plastic tube in the periodontal pocket of a lower deciduous incisor. The plastic tube was removed using diamond tweezers in all cases. The results suggest that the symptoms of periodontitis disappear quickly after removal of the plastic tube in such cases and that the affected tooth is normally replaced with the succedaneous tooth. However, while recovering to some extent, the alveolar bone supporting the affected tooth is unlikely to return to normal. This indicates the importance of raising awareness of this problem among dentists and encouraging manufacturers to improve the design and color of such tubes if this type of accident is to be avoided. plastic tubes in the periodontal pocket over the crown of a deciduous incisor in infants and assess the prognosis for periodontitis and alveolar bone loss.
Case 1A Japanese girl aged 1 year 7 months was referred to the Pediatric Dental Clinic of Tokyo Dental College Chiba Hospital by her family dentist for treatment of traumatic injury to the lower anterior region of the mandible. At the age of 1 year 4 months, she had been taken to the same dentist for injury to the bilateral deciduous lower central incisors due to a collision with a table. However, at that time, no significant symptoms were observed and she had not undergone any treatment. The dentist had, however, pointed out a morphological defect in her lower left deciduous central incisor completely unrelated to the injury. Her mother informed us that the girl had become distressed and consequently began touching the lower anterior
The purpose of the present study was to investigate change in the size of the jaw and deciduous teeth in Japanese children over the past 40 years by performing measurements on plaster models of the dental arch obtained from children born between 2007 and 2009 (2000s group) and children born between 1968 and 1974 (70s) group. A total of 61 children were enrolled in the 2000s group, comprising 25 boys (average age, 4 years 5 months) and 36 girls (average age, 4 years 4 months), and 93 children in the 70s group, comprising 45 boys (4 years 6 months) and 48 girls (4 years 4 months). The mesiodistal width of the crown, dental arch width, dental arch length, dental arch height, and available arch length in these groups were measured using a 3D measurement system and the sums of the mesiodistal width of the crown and tooth size-arch length discrepancies calculated. The results of the two groups were statistically compared and the following conclusions reached: the size of deciduous teeth has not changed statistically over the last 40 years; the size of the dental arch has decreased in boys (p<0.01), while remaining approximately the same in girls; and the tooth size-arch length discrepancy has decreased, especially in boys (p<0.01). These results indicate that the interdental spaces of the deciduous dentition have decreased, increasing the risk of crowding in Japanese children.
To investigate whether the relationship between tooth shape ratio and incisor arrangement proposed by was applicable to Japanese children, we compared two groups, one with normal permanent dentition and another with crowded permanent dentition, using chronologically constructed plaster dentition models. Tooth shape ratio was obtained by dividing the incisor mesio-distal width by the labio-lingual width and then multiplying the result by 100. The results revealed a significant difference in the coronal mesio-distal diameter of the incisors between the two groups, but the other items showed no significant differences, suggesting no clear relationship between tooth shape ratio and incisor arrangement. That was, our results suggest that there is no clear relationship between tooth shape ratio of the mandibular incisors and arrangement of the permanent incisors in Japanese children.
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