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KMID : 0376319910030010199
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Dental Journal of CNU
1991 Volume.3 No. 1 p.199 ~ p.213
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A study on the relationship between pubertal growth spurt, skeletal maturity stages of the hand?wrist, tooth calcification stages and jaw growth in normal occlusion
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Abstract
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To investigate the relationship between pubertal growth spurt in body height, skeletal maturity stages of the Hand-wrist, tooth calcification stages and maxilla and mandibular growth in normal occlusion, the author took the Hand-Wrist radiograph, lateral cephalogram and panoramic view from 464 subjects(boy 220, girl 244), aged 7 through 17 years, having normal occlusion.
Skeletal maturity was assessed on the hand-wrist view by Fishman´s SMI method and jaw growth was determined by 3 mandibular linear measurements : Ar-A, Ar-Pog, Go-Me in the cephalograph. Tooth calcification stage was rated on the panoramic view using the method described by Demirjian in which 8 stages of calcification. Menarche age was investigated and pubertal growth spurt was assessed with longitudinal datas of body height from 7 to 17 years.
The results were as follows
1. The peak height velocity(PHV) during pubertal growth occurred at the age of 12Y 11M boys, 11Y 4M in girls and 17months earlier in girls than in boys. The period of ONSET to END of the pubertal growth was 5Y 1M in boys, 4Y 5M in girls and longer in boys than in girls. The growth velocity at PHV was 9.7cm/year in boys, 8.7cm/year in girls and greater in boys than in girls.
2. In the skeletal maturity stages of hand-wrist, the pubertal growth spurt appeared between SMI level 4 and 5 in boys and SMI level 6 in girls. The ossification of the ulnar sesamoid bone(SMI level 4) occured 7 months earlier than PHV in boys and about 14 months earlier than PHV in girls.
3. PHV was coincident with G-stage of maxillary and mandibular canine, mandibular first and second premolar, mandibular second molar in boys, and G-stage of maxillary and mandibular canine and F-stage of mandibular second premolar and mandibular second molar in girls.
4. The mean age of menarche was 12Y 11Month and the menarche occurred at 19months after maximum pubertal growth.
5. The correlations coefficients(r) were 0.73 between PHV and skeletal age, 0.72-0.75 between PHV and calcification of the teeth, and 0.82-0.84 between skeletal age and calcification of the teeth The correlation coefficients were 0.48 between menarche and PHV, and 0.61 between menarche and skeletal age.
6. peak velocity in maxilla and mandibular growth was coincident with PHV during pubertal growth spurt both boys and girls. Particularly, ArPog growth curve indicating mandibular growth coincident with pubertal growth spurt in body height.
The strong correlation between PHV, skeletal age, calcification of the selected teeth and menarch suggest that these ipdicators might used efficiently in the estimating the level of skeletal development and the planning of orthodontic treatment.
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