Treatment of skeletal crossbite young adults with mandibular deviation by RME and MEAW techniques / 中华医学美学美容杂志

ABSTRACT

Objective To evaluate the effects of multiloop edgewise arch wire(MEAW)technique combined with rapid maxillary expansion(RME)in correcting skeletal crossbite young adults with mandibular deviation.Methods 9 young adults with skeletal class Ⅲ malocclusion and mandibular deviation were selected(4 males,5 females,aged from 16.2-18.8 years).They were all corrected with RME and MEAW techniques.Cephalometric radiographs were taken and analyzed at the pretreatment(T1)and post-treatment(T2).Students't-test was used to determine if there were significant differences between the 2 time periods.Results SNA increased by(1.4+1.7)°,SNB decreased by(0.7+0.9)°,and ANB increased by(2.1+0.9)°;U1-SN increased by(2.7+3.7)°and L1-MP decreased by(5.4+2.9)°.MP-SN and Mp-FH increased by(1.9+2.0)°and(1.1+2.6)°respectively,neither of which had significant difference.Maz-Maz' increased by(2.6+2.8)mm,while Um-Um'increased by(6.2+5.9)mm.The latter had significant difference.△Cd-Me and △Cd-Go decreased by (3.7+2.1)mm and(2.8+1.6)mm respectively;while ManDP-MSL and Me-MSL decreased by (3.8+2.3)mmand(3.6+2.5)mm,respectively.All of them had significant differences.Conclusion MEAW technique combined with RME is a clinically effective method for correcting adults with mild and moderate skeletal crossbite and mandibular deviation.