Oral health status of Lisu 12-year-old children in the Yunnan province of China: a cross-sectional study
Abstract Background Lisu is an ethnic minority group living in Yunnan, a province in Southwest China. This study investigated the oral health status among 12-year-old Lisu children in Yunnan. Method: A multistage sampling method was adopted to recruit 12-year-old Lisu children from primary schools. A self-administrated questionnaire was distributed to the children to collect their sociodemographic background information and oral health-related behaviours. Two calibrated dentists performed the oral examinations in the primary schools. They examined dental caries, gingivitis and dental fluorosis using the diagnosis criteria recommended by the World Health Organization. A Chi-square test, the Mann-Whitney U test, zero-inflated negative binomial (ZINB) regression and multivariate logistic regression were used for statistical analysis. Results A total of 512 Lisu children were invited, and 482 children (48% boys) participated in the study (response rate: 94%). The caries prevalence was 35% and caries experience in mean (SD) DMFT scores was 0.63 (0.10). The mean (SD) DT score was 0.60 (1.10), consisting 95% of the mean DMFT scores. Gingivitis was found on 426 children (88%), while no dental fluorosis was observed. Results of ZINB model indicated sex and sugary-snacking habits were related to the dental caries experience (p < 0.05). The prevalence rate of gingivitis was associated with the mother’s education level, the child’s monthly-pocket money and daily toothbrushing frequency (p < 0.05). Conclusion Dental caries and gingivitis were prevalent among 12-year-old Lisu children in the Yunnan province in China, and most of the decayed teeth were unrestored. Dental fluorosis was not observed in the children.