Methods: Ten adult patients with the mean age of 27 years that were undergone orthodontic mesial movement of posterior teeth for first permanent molar space closure in a private practice , were chosen.cephalometric variables befor and after treatment were measured and statistical analysis were accomplished.
Results: LAFH(Lower anteior facial height),TAFH,GoGn-SN,Occ-SN,Yaxis,U1 to SN,L1 to GoGn variables were decreased.Decreases in LAFH,TAFH,GoGn-SN were significant.UAFH,Jaraback index,U1 to L1 were increased.Increases in Jaraback index,U1 to L1 were significant .
Conclusions: The results of this study showed that orthodontic closure of lower first permanent molar space caused to decrease in lower anterior facial height.