Delayed eruption of permanent teeth in mentally retareded children

This study aimed on determining the delay in development of teeth and the sequence of eruption of permanent teeth in children with Down's syndrome to aid in planning a preventive and interceptive program for such children, so a group of mentally retarded children were examined clinically, and the mean eruption time was registered in addition to missing teeth. It was concluded that there was a significant delay in the eruption and development of teeth with a high percentage of missing teeth compared to normal children that was related to the delay in crown calcification and root formation in such specific patients