论文部分内容阅读
Objective:To compare the clinical ef ects of maxil ary protraction and FR-Ⅲfunctional appliances in the treatment of anterior crossbite in mixed dentition,so as to provide in-formation for clinical treatment.Methods:Forty patients with anterior crossbite were col ected in oral department of Qingdao stomatological hospital,aged from 7 to 12 years,averaged at 9.6 years.Patients were divided into two treatment groups.One group was treated with Facemask orthopedic maxil ary protraction by removable appliance,and the other group was treated with FR-Ⅲ appliances.Cephalometric film was taken for each patient before and after treatment.Lineal and angular changes of anatomic marks were calculated.Data were analyzed by paired-sam-ples T test and independent-samples T test.Results:Crossbite were corrected successful y in two treatment groups.In facemask group,maxil ary anterior teeth were procline,the ef ect of face-mask group was marked .A point moved forward for 2.62mm,while length of maxil ary increased for 2.36mm.In FR-Ⅲgroup,mandibular anterior teeth were retrocline,while the mandibular occurred clockwise rotation.Conclusion:Maxil ary Protraction and FR-Ⅲcan ef ectively improve skeletal crossbite and the coordintation between maxil ary and mandibular.Maxil ary protraction is more ef ective in the patients with maxil ary deficiency,while FR-Ⅲ appliance can be used in those with unstable retention as wel as slightly maxil ary deficiency.