Obejective:To investigate the awareness of parents on problems of their children' malocclusion and provide usefull evidences for prevention. Method:A prestructured questionnaire was distributed to parents visiting the Department of Pediatric Dentistry,School of Stomatology,the Fourth Military Medical University. Result:The sample consisted of 922 children with 24.16 % of their presenting chief complaints was to obtain treatment of malocclusion while 20.4 % of them were diagnosed as malocclusion,which shown significant difference between them (P < 0.005). When patients preferred receiving treatment,problems that their parents worried about were efficacy(22.55 %),children discomfor(t22.3 %), inconvenient for eating(16.91 %)and harmful for beauty(16.67 %). Conclusion:More and more parents shown concerns about their children' malalignment and malocclusion. But lacking of professional knowledge may lead to the situation that they often loss the best treatment opportunity. So,much more efforts need to be exerted to enhance parents' knowledge on current situation of their children's malalignment and malocclusion.

Objectives To study the trends and characteristics of dental caries of deciduous teeth in Shanghai at the beginning of the twentigth century. Methods The caries status of children aged 2-5 were examined in the same kindergarten in Shanghai for 4 years consecutively. The prevalence of dental caries, DFT and Caries Severity Index (CSI) were calculated. The 3-year consecutive data of 140 children (54, 2 y and 86, 3 y) were analyzed and the increments of caries status were calculated annually. Results The prevalence of dental caries, DFT and CSI had no distinct change generally in the 4 years. The caries status got worse with age in every year. The analysis of the 3 years consecutive data in 140 children indicated that the caries status got worse year by year, and there was no difference in the increments of caries status among two years as a whole, as well as each age group. The increment of prevalence of dental caries of 2 y group was much higher than that of 3 y group in the first year, while there was no difference in the increments of DFT and CSI between two age groups. Conclusions The caries status in this kindergarten had no distinct change generally in 4 years. The prevalence of dental caries increased remarkably from 2 to 3 years old. It is indicated that the prevention and treatment for dental caries of deciduous teeth should be enhanced from 2-year-old kids.