Abstract
Aims: the study was planned to assess the value of the change among four pubertal age groups of
Class l occlusion. Materials and Methods: The sample subjects were comprise of the flowing groups:
11yeas(23 males&25 females), 12years(19 males &22 females), 13years(22 males &28 females) and
14years(22 males &22 females). Each individual radiographed with cephalometric film. The cephalometric
films traced and the mandibular lengths ( Ar–Pog, & Go–Gn & Ar–Go) were measured. The
data subjected to the descriptive and variance statistics at 0.05 significant level. Results: The findings
disclosed that the mandibular lengths (Ar–Pog, Go–Gn &Ar–Go) were significantly greater value at
14years age group as compared with 11,12,&13 years age groups. The sex variation appeared insignificant
change among the four age groups for the mandibular lengths. Conclusion: The increase mandibular
length at age 14 years can be regarded in relive the crowding at 11,12, &13 years age groups
for both sexes
