The Eruption Sequence of Primary and Permanent Teeth in a Group of Children

Abstract

Aim: Determine eruption dates & sequence and to correlate between chronological and developmental age of eruption of primary and permanent teeth. Methods: Study sample consisted of 1526 apparently healthy children of both genders, 1020 children were selected from schools, and 506 children were selected from children attending Maternal and Child Welfare Centers. Results: Eruption sequence in primary teeth in both genders was: lower primary central incisor (LA), Upper primary central incisor (UA), upper primary lateral incisor (UB), lower primary lateral incisor (LB), upper primary first molar (UD), lower primary first molar (LD), Upper primary canine (UC), lower primary canine (LC), lower primary second molar (LE), and upper primary second molar (UE). Sequence of eruption of permanent teeth in boys was: lower permanent first molar (L6), lower permanent central incisor (L1), lower permanent lateral incisor (L2), upper permanent central incisor (U1), upper permanent lateral incisor (U2), upper permanent first molar (U6), lower permanent first premolar (L4), upper permanent first premolar (U4), upper permanent second premolar (U5), lower permanent canine (L3), lower permanent second premolar (L5), lower permanent second molar (L7), upper permanent second molar (U7) and upper permanent canine (U3). In girls: L1, L2, U1, U2, U6, L6, L3, L4, L5, U4, U5, L7, U7, and U3. In boys, deviation from the standard range exceeding 50% except for LA, UE, and LE. In girls, deviation was exceeding 50% in UC, UE, LA, LB, LC, LD, and LE. There were statistically significant difference between means age of eruption of permanent teeth in boys and girls for U1, U2, U5, U6, and L6. Conclusion: Sequence and dates of eruption of teeth differ among populations. Orthodontists and pediatric dentists can rely on specific standards of Eruption dates & sequence for diagnosis, treatment planning, and preventive programs.