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[Radiographic study of the development of the permanent teeth]
1Department of Oral Radiology, Peking University School of Stomatology, Beijing 100081, China.
Objective:
To study the development of permanent teeth by radiographic methods.
Methods:
The permanent teeth development of children ranging from 4-17 years was evaluated from 1709 panoramic radiographs by the Nolla's method. Each tooth was graded from 0 to 10 stage. The average developmental stage for girls and boys were calculated.
Results:
The average developmental stage and development curves for girls and boys were obtained respectively. For the completion of crown and root development, girls are more advanced than boys by an average of 0.3 and 0.6 years.
Conclusions:
Girls are ahead of boys for the development of the permanent teeth. The norms of the maturation of permanent teeth can be used to evaluated the development of the individual teeth.