A study of mandibular growth maturation was performed on a population of 103 patients
during orthodontic treatment (69 girls and 34 boys) from 11 to 16 years, having initially
a Class II skeletal discrepancy. The relationship between wrist maturation indices and the
cervical vertebrae maturation was studied by Lamparski classification. Significant
correlations were found between Björk stages, MP3=, MP3 cap and MP3 U and respectively
Lamparski stages as CVS 2, CVS 3-4 and CVS 5-6. This retrospective longitudinal study
identified three mandibular variables at three different maturation stages according to
Björk classification and to the six stages of Lamparski classification. The relationships
between these different maturation stages and a quantitative mandibular response permit to
estimate optimal time for our orthodontic therapy. The results indicate a significant
increase in mandibular length between CVS 4 and CVS 5, suggesting the persistence of a
condylar response to a stimulation therapy after CVS3 or CVS 4 stages (MP3 cap).
Mandibular growth seems to continue after MP3 U stage or CVS 5 stage.