[Application of residual crown of premolar restored with two shapes of fiber post systems].

PURPOSE: To compare the effects of premolars restored with 2 different types of fiber post systems, so as to provide experience for restoration of residual crown of premolars. METHODS: Fifty-three residual crowns of premolar restored with fiber post systems were collected, and randomly divided into 2 groups: parallel fiber post group and double taper fiber post group. Repairing effect and operation difficulty were compared. The data was analyzed with SPSS 13.0 software package. RESULTS: There was no significant difference in success rate between the 2 groups, four complications occurred in parallel fiber post group and one in double taper fiber post group. CONCLUSIONS: The success rate between parallel fiber post groups and double taper fiber post group was not different, but the complication in double taper fiber post group is lower than parallel fiber post group.

[Pit and fissure sealant for caries prevention in 457 children in Uygur city: results of 2-year follow-up].

PURPOSE: To investigate the 2-year results of pit and fissure sealant in 457 children in Uygur city for caries prevention in the first permanent molars. METHODS: One thousand four hundred and ninety-nine newly erupted first permanent molars in 457 children between the ages of 7 and 9 in Uygur city underwent pit and fissure sealing using 3M Concisse sealant. The retention of sealants 6, 12 and 24 months after sealing was observed and the caries occurrence were recorded. The data was analyzed with SPSS 16.0 software package. RESULTS: The retention rate of pit and fissure sealant 6, 12 and 24 months after sealing was 98.33%, 92.71% and 88.93%, respectively. The frequency of dental caries was 0%, 0.63% and 1.15% respectively, which were significantly reduced compared with the average prevalence in China (P<0.05). CONCLUSIONS: Pit and fissure sealant is safe and effective in preventing dental decay in first permanent molar in Uygur children, which is worthy of wide clinical application. Supported by Comprehensive Intervention Pilot Project for Pediatric Oral Diseases in Middle and Western Area of China in 2010.

[Caries prevalence of the first permanent molar among 7-9 years old Uygur children in Urumqi, Xinjiang Autonomous Region].

PURPOSE: To investigate the caries status of the first permanent molar among 7-9 years old Uygur children in Urumqi, Xinjiang Autonomous Region, and provide bases for the oral health care of children in Urumqi. METHODS: The study was conducted in a preschool in Urumqi, Xinjiang Autonomous Region, involving 1600 children aged among 7-9 years old. The dental caries of these children were examined by 2 general dentists according to the criteria of the Third National Epidemiological Survey in China. Data were analyzed by SPSS16.0 software package for X(2) test and student's t test. RESULTS: The prevalence of caries in the first permanent molar among these children was 26.50%, with a mean DMFT of 0.44. The caries prevalence in boys was 22.98% and 30% in girls (P<0.05). The DMFT in boys and girls was 0.41, 0.47, respectively. The caries prevalence increased along with the increase of age. The caries prevalence of 9-year-old children was significantly higher than that in 7 and 8-year-old children (P<0.05). CONCLUSIONS: The caries prevalence of the first permanent molar among 7-9 years old children in Urumqi, Xinjiang Autonomous Region is high. It is necessary to enhance the early guidance for the Uygur children to develop good oral health habits and status. Supported by 2010 West China Children's Oral Disease Interventional Polit Project.