PMID: 29308524Jan 9, 2018Paper

Study on development time of mandibular permanent teeth with Demirjian method in 928 children

Shanghai kou qiang yi xue = Shanghai journal of stomatology
Yue Fei, Jun Wang

Abstract

This study aimed to establish the developmental timetable of mandibular permanent teeth in children aged 5-15 years, and analyze the rapid developmental range of each permanent tooth and explore the gender differences in development of permanent teeth. Nine hundred and twenty eight children aged 5-15 years were included, the stage of each mandibular permanent teeth was recorded with Demirjian method. The developmental lines and the fitting curves of each tooth were drawn. The age of the important development nodes was summarized, and the slope of the developmental line was recorded. The similarities and differences between male and female were analyzed with SPSS 22.0 software package. Mandibular permanent incisors were found to experience their developmental peak from 6.50 to 7.50 years old, while mandibular permanent premolars' developmental peak were 7.00-8.00 years old. Boys' mandibular first molar reached their peak from 6.50 to 7.50, 8.50 to 9.50 years old, while girls' teeth developed earlier than that of boys, but the developmental rate was similar. In this study, the developmental peak and developmental timetable of mandibular permanent teeth suitable for the domestic population were obtained, which was different from t...Continue Reading

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