The mandibular dimension changes among four age groups

الملخص EN

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 : 11 yeas (23 males and 25 females), 12years (19 males and 22 females), 13years (22 males and 28 females) and 14 years (22 males and 22 females).

Each individual radiographed with cephalometric film.

The cephalometric films traced and the mandibular lengths (Ar–Pog and Go–Gn and Ar–Go) were measured.

The data subjected to the descriptive and variance statistics at 0.05 significant levels.

Results : the findings disclosed that the mandibular lengths (Ar–Pog, Go–Gn and Ar–Go) were significantly greater value at 14 years age group as compared with 11, 12, and 13 years age groups.

The sex variation appeared insignificant change among the four age groups for the mandibular lengths.

Conclusion : the increase mandibular lengths at age 14 years can be regarded in relive the crowding at 11, 12, & 13 years age groups for both sexes.