Maged Sultan Alhammadi1, Hanem Younes Elfeky2, Mona Salah Fayed3, Ramy Abdul Rahman Ishaq4, Esam Halboub5, Abeer Abdulkareem Al-Mashraqi5. 1. Division of Orthodontics and Dentofacial Orthopedics, Department of Preventive Dental Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia. magedorth@yahoo.com. 2. Department of Orthodontics and Dentofacial Orthopedics, Faculty of Dentistry, Fayoum University, Fayoum, Egypt. 3. Department of Orthodontics and Dentofacial Orthopedics, Faculty of Dentistry, Cairo University, Cairo, Egypt. 4. Department of Biological and Preventive Sciences, Orthodontic Division, Faculty of Dentistry, University of Science and Technology, Sana'a, Yemen. 5. Department of Maxillofacial Surgery and Diagnostic Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia.
Abstract
INTRODUCTION: To three-dimensionally analyze the skeletal and pharyngeal airway changes induced by Twin Block (TWB) and Forsus Fatigue Resistance Device (FFRD) in skeletal Class II female patients compared with untreated controls. MATERIALS AND METHODS: The study comprised 62 growing female patients with skeletal Class II malocclusion due to mandibular retrusion treated with either TWB (n = 23) or FFRD (n = 21), or neither (n = 18; controls). Pre- and posttreatment/observational cone beam computed tomography images were used to evaluate the treatment changes. RESULTS: TWB induced more obvious mandibular skeletal changes and caused significant retrusive effects on the maxilla. Similarly, the sagittal and vertical jaw relationships were affected more obviously with TWB (P <0.001) compared to FFRD. Changes in oropharyngeal volume and minimal axial area were more obvious with TWB. DISCUSSION: The TWB functional appliance induced significant skeletal and pharyngeal airway changes. These changes were more obvious relative to the slight changes induced by FFRD or by natural growth.
INTRODUCTION: To three-dimensionally analyze the skeletal and pharyngeal airway changes induced by Twin Block (TWB) and Forsus Fatigue Resistance Device (FFRD) in skeletal Class II female patients compared with untreated controls. MATERIALS AND METHODS: The study comprised 62 growing female patients with skeletal Class II malocclusion due to mandibular retrusion treated with either TWB (n = 23) or FFRD (n = 21), or neither (n = 18; controls). Pre- and posttreatment/observational cone beam computed tomography images were used to evaluate the treatment changes. RESULTS: TWB induced more obvious mandibular skeletal changes and caused significant retrusive effects on the maxilla. Similarly, the sagittal and vertical jaw relationships were affected more obviously with TWB (P <0.001) compared to FFRD. Changes in oropharyngeal volume and minimal axial area were more obvious with TWB. DISCUSSION: The TWB functional appliance induced significant skeletal and pharyngeal airway changes. These changes were more obvious relative to the slight changes induced by FFRD or by natural growth.
Authors: Kevin O'Brien; Jean Wright; Frances Conboy; YeWeng Sanjie; Nicky Mandall; Stephen Chadwick; Ivan Connolly; Paul Cook; David Birnie; Mark Hammond; Nigel Harradine; David Lewis; Cathy McDade; Laura Mitchell; Alison Murray; Julian O'Neill; Mike Read; Stephen Robinson; Dai Roberts-Harry; Jonathan Sandler; Ian Shaw Journal: Am J Orthod Dentofacial Orthop Date: 2003-08 Impact factor: 2.650