INTRODUCTION: The purpose of this study was to quantify anteroposterior and transverse facial soft-tissue changes with respect to underlying skeletal movements after maxillomandibular advancements by using cone-beam computed tomography. METHODS: Thirty white patients were treated by maxillomandibular advancements after LeFort I osteotomies and bilateral sagittal split osteotomies. The patients were scanned by using cone-beam computed tomography within 1 week before the surgery, within 1 week after the surgery, and a minimum of 8 weeks postsurgery. We measured the differences between the first and last images and calculated ratios for anteroposterior and transverse soft-to-hard tissue movements. Changes in the greatest interalar width were also measured. RESULTS: There was a statistically significant difference in the greatest interalar width change between patients receiving maxillary advancements greater than 4 mm and those having advancements less than or equal to 4 mm (P <0.023). Mean ratios of anteroposterior soft-to-hard tissue movements were 84.9% +/- 38.0% in the malar region, 96.1% +/- 15.5% in the chin, and 101.1% +/- 27.3% in the subcommissural region. Mean ratios of transverse soft-to-hard tissue movements were 39.4% +/- 19.7% in the malar region and 82.5% +/- 56.7% in the subcommissural region. CONCLUSIONS: The amount of maxillary advancement most likely plays a role in the postsurgical increase in interalar width. In addition, facial soft tissues appear to respond more to anterior movement of the jaws than to an increase in transverse dimensions after maxillomandibular advancements. Copyright 2010 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.
INTRODUCTION: The purpose of this study was to quantify anteroposterior and transverse facial soft-tissue changes with respect to underlying skeletal movements after maxillomandibular advancements by using cone-beam computed tomography. METHODS: Thirty white patients were treated by maxillomandibular advancements after LeFort I osteotomies and bilateral sagittal split osteotomies. The patients were scanned by using cone-beam computed tomography within 1 week before the surgery, within 1 week after the surgery, and a minimum of 8 weeks postsurgery. We measured the differences between the first and last images and calculated ratios for anteroposterior and transverse soft-to-hard tissue movements. Changes in the greatest interalar width were also measured. RESULTS: There was a statistically significant difference in the greatest interalar width change between patients receiving maxillary advancements greater than 4 mm and those having advancements less than or equal to 4 mm (P <0.023). Mean ratios of anteroposterior soft-to-hard tissue movements were 84.9% +/- 38.0% in the malar region, 96.1% +/- 15.5% in the chin, and 101.1% +/- 27.3% in the subcommissural region. Mean ratios of transverse soft-to-hard tissue movements were 39.4% +/- 19.7% in the malar region and 82.5% +/- 56.7% in the subcommissural region. CONCLUSIONS: The amount of maxillary advancement most likely plays a role in the postsurgical increase in interalar width. In addition, facial soft tissues appear to respond more to anterior movement of the jaws than to an increase in transverse dimensions after maxillomandibular advancements. Copyright 2010 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.
Authors: Andreas F Hellak; Bernhard Kirsten; Michael Schauseil; Rolf Davids; Wolfgang M Kater; Heike M Korbmacher-Steiner Journal: Head Face Med Date: 2015-07-09 Impact factor: 2.151
Authors: Hon Kwan Woo; Deepal Haresh Ajmera; Pradeep Singh; Kar Yan Li; Michael Marc Bornstein; Kwan Lok Tse; Yanqi Yang; Min Gu Journal: Head Face Med Date: 2020-04-28 Impact factor: 2.151
Authors: Deepal Haresh Ajmera; Richard Tai-Chiu Hsung; Pradeep Singh; Natalie Sui Miu Wong; Andy Wai Kan Yeung; Walter Yu Hang Lam; Balvinder S Khambay; Yiu Yan Leung; Min Gu Journal: Clin Oral Investig Date: 2022-03-23 Impact factor: 3.606