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The timing of orthodontic treatment is of great importance, treatment plans should be according to type of malocclusion. Some needs early intervention while other type would benefit from delaying the planned treatment. Patients with same chronological age have different rate of maturation having an idea about physiological development will greatly reduce the risk of treatment failure, as well as insufficient coast & effort. Morphology of Cervical vertebrae has been used as a reliable biological (physiological) indicator for determination of skeletal maturation. Aim of this study was to determine the most appropriate chronological age for treatment of patients with class 1, 2 & 3 malocclusions.The study group consisted of 480 lateral cephalogram of patients, which were divided into 240 male & 240 female ranging in age from 8 to 16 years. Each lateral cephalogram was traced using viewbox software & for assessing maturation of cervical vertebrae body of C2(Axis),C3 & C4 were analyzed according to Bacceti modified version of CVS. For data analysis SPSS software version 16 was used. Values of fisher test for different types of malocclusions suggest a significant effect of age on maturation of cervical vertebrae in patients with malocclusion. Values of correlation between gender & skeletal stage in patients with class 1,2 & 3 malocclusions indicate significant difference between genders in class 2 & 3 while in class 1 malocclusion there was no significance difference between genders.The result of this study suggests that girls were ahead of boys in attaining skeletal maturity. Pubertal spurt of our study population occurred approximately at the age of 12.Although there was significant difference between genders in maturation of cervical vertebrae in patients with class 2 & 3 malocclusions, patients with class 1 malocclusion showed no significant difference.

Determining Chronological Age for the Treatment of Class I, II and III Malocclusion in the Crowd of Iranians