Dentoskeletal Profile Changes after Maxillary Protraction with Expansion in Patients with Primary Class III Malocclusion

Objective To evaluate the changes in patients with sketetal class Ⅲ malocclusion after maxillary protraction with expansion in the primary class Ⅲ dentition.Methords Sixteen skeletal class Ⅲ patients including 9 males and 7 females,in the primary dentition were selected,whose age ranged from 5.3 to 6.5 years.The patients present with a concave facial profile,and anterior or posterior crossbite.No apparent mandibular displacement was found in any patients.Cephalograms were taken before and after maxillary protraction with expansion respectively.Results Maxillary advancement,mandibular rotation,labial tipping of the maxillary incisors,lingual tipping of the mandibular incisors,and improvement of facial profiles were noticed.Conclusion This treatment showed that significant dentoskeletal changes and improvements in dentofacial profile resulted from 6 months of treatment with maxillary expansion and protraction.