H H Liu1, G Shen, R J Chen, L Tao. 1. Department of Orthodontic, School of Stomatology, Shanghai Second Medical University. Shanghai 200011, China.
Abstract
OBJECTIVE: To research the intrinsic relationship in the growth and development progress of adolescents and to provide scientific basis for orthodontic diagnosis and treatment. METHODS: Sample included 125 Shanghai adolescents between 11-15 years old, and the relationship among maxillary length, mandibular length, ossification of finger's bone, body height and the age of first coming of menstruation on female was studied. RESULTS: The ossification of finger's bone, the increase of maxilla and mandibular lengths and the body height of Shanghai adolescents between 11-15 years old keep the same pace tendency. Female goes into the young quick growing period 2 years earlier than male, but from about 13 years old the growing speed of male is apparently more quick than that of female. When the ossification of finger's bone is nearly 100%, the body height and the mandibular length of male still possesses great growing capacity. The age of sesamoid bone appearance for both male and female and the age of first coming menstruation for female are getting earlier when comparing with others regions. CONCLUSION: There is a close relationship among ossification of finger's bone, maxilla and mandibular lengths and body height of adolescents. Understanding the intrinsic rule correctly has the guiding significance to early diagnosis and treatment in clinical orthodontics.
OBJECTIVE: To research the intrinsic relationship in the growth and development progress of adolescents and to provide scientific basis for orthodontic diagnosis and treatment. METHODS: Sample included 125 Shanghai adolescents between 11-15 years old, and the relationship among maxillary length, mandibular length, ossification of finger's bone, body height and the age of first coming of menstruation on female was studied. RESULTS: The ossification of finger's bone, the increase of maxilla and mandibular lengths and the body height of Shanghai adolescents between 11-15 years old keep the same pace tendency. Female goes into the young quick growing period 2 years earlier than male, but from about 13 years old the growing speed of male is apparently more quick than that of female. When the ossification of finger's bone is nearly 100%, the body height and the mandibular length of male still possesses great growing capacity. The age of sesamoid bone appearance for both male and female and the age of first coming menstruation for female are getting earlier when comparing with others regions. CONCLUSION: There is a close relationship among ossification of finger's bone, maxilla and mandibular lengths and body height of adolescents. Understanding the intrinsic rule correctly has the guiding significance to early diagnosis and treatment in clinical orthodontics.