RESUMO
ObjectiveTo evaluate the effects of modified interocclusal lip arch appliance in correcting primary dentition functional crossbite.Methods Twenty children with functional crossbite were selected and treated with this new method.Cephalometric radiographs were taken and analyzed at the pre-treatment time (T1) and the post-treatment time (T2).Students't-test was used to determine if there were significant differences between the 2 time periods.ResultsSNA increased by (0.35 ±1.12)°,SNB decreased by (2.53±0.91)°,and ANB increased by (2.88± 2.24)°.Ns-Sn-Pos increased by (3.32±2.14)°,Ns-Prm-Pos decreased by (3.46±2.63)°.All of the anterior crossbites were corrected and the profiles were improved satisfactorily.Conclusions Modified interocclusal lip arch appliance is a clinically effective method for correcting primary dentition functional crossbite,balancing anteroposterior jaw relationship,and improving the face profile.