American Journal of Orthodontics and Dentofacial Orthopedics
Original articlePredicting mandibular growth potential with cervical vertebral bone age
Section snippets
Material and methods
Lateral cephalometric and hand-wrist radiographs obtained from the Department of Orthodontics, Tohoku University Dental Hospital, Sendai, Japan, were examined. The images are 1.0625 times the actual size.
The subjects consisted of 2 groups of 20 Japanese girls and young women. These groups were each divided into initial and final stages of growth: 7.0- to 13.9-year-old subjects were grouped as the initial stage, and those older than 17.0 years were the final stage. In group A, subjects in the
Results
The average error between the first and second measurements for total mandibular length was 0.53 ± 0.31 mm (r = .997, P < .001).
The formula for predicting mandibular growth potential was determined by regression analysis: mandibular growth potential (in millimeters) = −2.76 × cervical vertebral bone age + 38.68 (r = .857).
A scattergram between cervical vertebral bone age and mandibular growth potential in group A is shown in Figure 4.
Table II{ shows the predicted mandibular growth potential
Discussion
The purpose of this study was to assess the possibility of predicting mandibular growth potential with cervical vertebral bone age, which was assessed from cephalometric radiographs. In many circumstances, it is important to be able to predict mandibular growth potential (eg, to determine when to apply functional appliances in Class II patients or when to perform orthopedic surgery in cases of severe skeletal deformity).
Sato et al4 attempted to predict mandibular growth potential with bone age,
Conclusions
This study has produced a method for predicting mandibular growth potential with only cephalometric radiographs. This method might be useful in treating orthodontic patients in the growth stage.
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