"the frequency of different types of primary teeth discoloration in children in paediatric department of faculty of dentistry, tehran university of medical sciences, in 1999-2001 "

statement of problem: primary teeth discoloration can cause mentally and socially unpleasant effects in children. this can also be a sign of systemic disease. despite the importance of this subject, a comprehensive study has not been performed yet. purpose: the aim of this study was determining the frequency of different types of primary teeth discoloration. materials and methods: in this cross-sectional study 260 cases whom were referred to department of paediatric, faculty of dentistry, tehran university of medical science, 1999-2001 were examined. all of these children were examined for any discoloration before starting any treatment then the type of discoloration was determined after polishing. then the relationship between gender and these changes were evaluated by chi-square test. results: in 59 cases (22.7%) abnormal color was detected. 10 patients (3.9%) had intrinsic stain and in 15 children (5.8%) extrinsic color was discovered. 34 children (13%) had both types. conclusion: in this survey the correlation between tooth discoloration (and its types) and gender was not statistically significant.