Aim - the purpose of our study is to evaluate vertical dimension changes in patients with the extraction and nonextraction of first four premolars of the skeletal Class II patients. Our study's material is consisting of pretreatment and post-treatment lateral cephalometric radiographs of 31 individuals between 12 - 25 ages with the average age of 15,95 who having skeletal class II malocclusion with ANB angle greater than <$E4 symbol Р>. 13 patients are treated with first four premolar extraction treatment and 18 patients were nonextraction. In the extraction group, SN-GoGn, MP-PP and Y-axis angle were decreased significantly (P << 0,05) after treatment. There was no change in vertical dimensions of nonextraction group except SN-PP angle (P << 0,05). Conclusions: four first premolar extraction orthodontic treatment is an effective way of decreasing vertical skeletal dimensions.

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