title: Eruption age of permanent mandibular first molars and central incisors in the south Indian population.
abstract: OBJECTIVE
  The existing eruption schedules for permanent and deciduous dentition are based on studies in the Western population. Since Indians differ from Westerners racially, genetically, and environmentally, these studies fail to provide relevant guidance on the eruption schedule in the Indian population. This study aims at determining the eruption pattern of permanent mandibular molars and central incisors in the south Indian population.
  
  
  METHODS
  10,156 apparently healthy Indian children in the age-group of 6-9 years were examined with mouth mirror and probe under adequate illumination for the status of the eruption of the permanent mandibular first molar and permanent mandibular central incisor. Pearson's Chi-square test with Yates' continuity correction was used to calculate the P -value for comparison of proportion between girls and boys. The values obtained in our study were compared with the standard values. The Z-test with continuity correction was used to calculate the P -value.
  
  
  RESULTS
  As per our study, the permanent mandibular first molars and central incisors erupted one to two years later compared to the values reported in Westerners. The earlier eruption of the permanent mandibular first molars compared to the permanent mandibular central incisors, as well as the earlier eruption of both the teeth in girls compared to boys, were in accordance with the existing literature.
  
  
  CONCLUSIONS
  The eruption age reported by us may form a standard reference for eruption age in Indians.
authors.affiliation: Department of Oral and Maxillo Facial Pathology, Meenakshi Ammal Dental College and Hospital, Chennai - 600 095, India.
authors.forename: Rakhi
authors.initials: R
authors.lastname: Gupta
authors.forename: B
authors.initials: B
authors.lastname: Sivapathasundharam
authors.forename: A
authors.initials: A
authors.lastname: Einstein
mesh_terms: D000367:Age Factors; D002648:Child; D005260:Female; D006801:Humans; D007180:Incisor / Q000502:physiology*; D007194:India / Q000208:ethnology; D008297:Male; D008334:Mandible; D008963:Molar / Q000502:physiology*; D012737:Sex Factors; D014078:Tooth Eruption / Q000502:physiology*; D044465:White People / Q000208:ethnology*