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Short term dentoskeletal effects of mandibular advancement clear aligners in Class II growing patients. A prospective controlled study according to STROBE Guidelines
Pubblication date: 30/2021
Authors: S. Ravera, T. Castroflorio, F. Galati, G. Cugliari1, F. Garino2, A. Deregibus, V. Quinzi3
Institution: Post-Graduate School of Orthodontics, Lingotto – Dental School, Department of Surgical Sciences, University of Turin, Turin, Italy
1Genomic Variation in Human Population and Complex Diseases Unit, Department of Medical Sciences, University of Turin, Turin, Italy
²Private Practice, Turin, Italy
3Department of Life, Health and Environmental Sciences, University of l’Aquila, L’Aquila, Italy
Publication: European Journal of Paediatric Dentistry
Keywords: Class II malocclusion; Clear aligners; Growing subjects: Mandibular advancement.
Title: Short term dentoskeletal effects of mandibular advancement clear aligners in Class II growing patients. A prospective controlled study according to STROBE Guidelines
Abstract: Aim To evaluate the dentoskeletal effects of the Invisalign® Mandibular Advancement (MA) (Align Technology, San José, CA, USA) feature in skeletal Class II growing patients with mandibular retrusion, at pre-pubertal and pubertal stages.
Materials and methods Study design: Forty skeletal Class II patients were prospectively recruited and treated with Invisalign® MA. They were divided into two subgroups according to the CVM stage of growth (CVM2 and CVM3) at the beginning of treatment (T0). For each patient, lateral radiographs were collected at the beginning (T0) and at the end of the mandibular advancement treatment (T1) and their measurements were compared with those obtained by an untreated control group of 32 subjects, matched for growth stage and malocclusion.
Results Patients in CVM2 showed significant reduction of ANB angle, A:Po, Wits index, 11^Spp angle and significant increase of 11^41 and B Downs point. In CVM3 significant reduction of the Wits index and of 41^GoGn angle, and significant increase of the linear Co-Gn measurement, were revealed. Statistics: The STROBE guidelines were followed. Linear regression analysis was performed to estimate the differences of δ (T1 – T0) means between group (control was used as reference) stratifying by CVM levels.
Conclusions The use of Invisalign® MA is effective in treating Class II growing patient with retrognathic mandible in the short term period. While treatment at prepubertal stage of growth results in dentoalveolar rather than skeletal effects, treatment during the pubertal spurt produces skeletal effects with an annual rate of change of 5.8 mm.