Comparative evaluation of maxillary protraction with or without skeletal anchorage

• Published in: American journal of orthodontics and dentofacial orthopedics 2011-05, Vol.139 (5), p.636-649
• Main Authors: Şar, Çağla, Arman-Özçrpc, Ayça, Uçkan, Sina, Yazc, A. Canan
• Format: Article
• Language: English
• Subjects: Biological and medical sciences; Bone Plates; Case-Control Studies; Cephalometry - methods; Child; Chin - pathology; Dentistry; Extraoral Traction Appliances; Female; Follow-Up Studies; Humans; Incisor - pathology; Lip - pathology; Male; Malocclusion, Angle Class III - therapy; Mandible - pathology; Maxilla - pathology; Medical sciences; Molar - pathology; Nasal Bone - pathology; Orthodontic Anchorage Procedures - instrumentation; Orthodontic Appliance Design; Otorhinolaryngology. Stomatology; Palatal Expansion Technique - instrumentation; Prospective Studies; Rotation; Sella Turcica - pathology; Time Factors; Vertical Dimension
• ISSN: 0889-5406; 1097-6752
• DOI: 10.1016/j.ajodo.2009.06.039

Introduction The aim of this prospective clinical study was to evaluate the skeletal, dentoalveolar, and soft-tissue effects of maxillary protraction with miniplates compared with conventional facemask therapy and an untreated Class III control group. Methods Forty-five subjects who were in prepubertal or pubertal skeletal growth periods were included in the study and divided into 3 groups of 15 patients each. All subjects had skeletal and dental Class III malocclusions with maxillary deficiency, vertically normal growth pattern, anterior crossbite, Angle Class III molar relationship, normal or increased overbite, and retrusive nasomaxillary complex. Before maxillary protraction, rapid maxillary expansion with a bonded appliance was performed in both treatment groups. In the first group (MP+FM), consisting of 5 girls ande 10 boys (mean age, 10.91 years), facemasks were applied from 2 titanium miniplates surgically placed laterally to the apertura piriformis regions of the maxilla. The second group (FM) of 7 girls and 8 boys (mean age, 10.31 years) received maxillary protraction therapy with conventional facemasks applied from hooks of the rapid maxillary expansion appliance. The third group of 8 girls and 7 boys (mean age, 10.05 years) was the untreated control group. Lateral cephalometric films were obtained at the beginning and end of treatment or observation in all groups and analyzed according to a structural superimposition method. Measurements were evaulated statistically with Wilcoxon and Kruskal-Wallis tests. Results Treatment periods were 6.78 and 9.45 months in the MP+FM and FM groups, respectively, and the observation period in the control group was 7.59 months. The differences were significant between the 3 groups ( P