title: Crown and root lengths, and root-crown ratios of lower incisor teeth of mongoloid, non-monoloid retarded and normal individuals.
mesh_terms: D000293:Adolescent; D000328:Adult; D002508:Cephalometry; D003753:Dental Health Surveys; D004314:Down Syndrome; D005163:Factor Analysis, Statistical; D006801:Humans; D008607:Intellectual Disability; D008875:Middle Aged; D009520:New Zealand; D014070:Tooth / Q000033:anatomy & histology*