TABLE 105.1 CHRONOLOGY OF ERUPTION OF PRIMARY AND PERMANENT DENTITION Primary a Central incisor Lateral incisor Canine First molar Second molar Permanent b Central incisor Lateral incisor Canine First premolar Second premolar First molar Second molar Third molar a Mean Maxillary Mandible Mean age (mo) 10 (8–12) 11 (9–13) 19 (16–22) 16 (13–19 boys) (14–19 girls) 29 (25–33) Mean age (yrs) 7–7.5 8–8.5 11–11.6 10–10.3 10.7–11.2 6–6.3 12.2–12.7 20.5 Mean age (mo) (6–10) 13 (10–16) 20 (17–23) 16 (14–18) 27 (23–31) Mean age (yrs) 6–6.5 7.2–7.7 9.7–10.2 10–10.7 10.7–11.5 6–6.2 11.7–12.0 20–20.5 age in months ± standard deviation (Reprinted from Lunt RC, Law DB A review of the chronology of eruption of deciduous teeth J Am Dent Assoc 1974;89(4):872–879 Copyright © 1974 American Dental Association With permission.) b Reprinted with permission from Baudi AR The development and eruption of the human dentitions In: Forrester DJ, Wagoner ML, Fleming J, eds Pediatric Dental Medicine Philadelphia, PA: Lea & Febiger; 1981