口腔の健康と歯の管理

概要

The Sequence and Chronology of the Eruption of Permanent Canines and Premolars in a Group of Romanian Children in Bucharest

Ion-Victor Feraru, Anca Maria R

Aim: The aim of this study was to determine the sequence and chronology of the eruption of permanent canines and premolars by gender in a group of Romanian schoolchildren from Bucharest. Methods: This retrospective study was conducted using the records of a sample of 2081 Caucasian children aged between 8 and 13 years who presented to the Paedodontic Clinic of the Faculty of Dental Medicine of UMF Carol Davila, Bucharest, and to the dental offices of two schools in Bucharest for consultation and treatment in the period 2006-2010. The resulting data were entered into a database and statistically analysed using the univariate analysis of variance to compare the differences in eruption times between tooth groups. Results: The permanent canines and premolars erupted between the mean times of 9.55 years of age (first lower premolar in girls) and 11.15 years of age (second lower premolar in girls). Eruption occurred earlier in girls than in boys in both dental arches with the exception of second premolars (girls: 11.15 years, boys: 11.05 years). The overall eruption sequence was first premolar, second premolar, and canine for the maxilla and first premolar, canine, and second premolar for the mandible. Conclusions: The overall results of this study are in accordance with data from many previous studies, with the exception of the sequence of eruption of upper canines and premolars in girls. The eruption sequence of premolars and permanent canines in the study group corresponded to type II described by Lo and Moyers (1953) in the maxilla and with type I described by Nolla (1960) in the mandible.