INTRODUCTION: This prospective observational study evaluated changes in the 3-dimensional position and remodeling of the mandibular rami, condyles, and chin at splint removal and 1 year after mandibular advancement surgery. METHODS: Presurgery, splint removal (4-6 weeks postsurgery), and 1-year postsurgery cone-beam computed tomography scans of 27 subjects were used. Superimposition on the cranial base was used to assess positional or remodeling changes in the anatomic regions of interest. Surface distance displacements were visually displayed and quantified by 3-dimensional color maps. A 1-sample t test was used to assess the average postsurgical changes of each region of interest. The level of significance was set at 0.05. RESULTS: After antero-inferior chin displacement with surgery (mean, 6.81 +/- 3.2 mm at splint removal), the average 1-year postsurgery displacement was not statistically significant (P = 0.44). Postsurgical adaptations greater than 2 mm were observed in 48% of the patients: 16% with an additional anterior-inferior displacement of the chin of 2 to 4 mm, and 4% with >or= 4 mm; 20% had postero-superior movement of 2 to 4 mm, and 8% had postero-superior movement of >or= 4 mm. The condyles tended to move, on average, <or= 2 mm supero-posteriorly with surgery, and this small positional displacement was maintained 1 year postsurgery (right condyle, P = 0.58; left, P = 0.88). The rami exhibited outward (lateral) movements with surgery, with greater displacement of the inferior part of the rami (2 mm in 65% of the subjects). This torque of the ramus with surgery was stable 1 year postsurgery. CONCLUSIONS: Three-dimensional assessment of skeletal changes with mandibular advancement surgery shows that nearly half of the patients have >2 mm change in chin position from splint removal to the 1-year follow-up, with approximately equal chances of anterior and posterior movement. Torque of the rami usually occurs with mandibular advancement surgery. Copyright 2010 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.
INTRODUCTION: This prospective observational study evaluated changes in the 3-dimensional position and remodeling of the mandibular rami, condyles, and chin at splint removal and 1 year after mandibular advancement surgery. METHODS: Presurgery, splint removal (4-6 weeks postsurgery), and 1-year postsurgery cone-beam computed tomography scans of 27 subjects were used. Superimposition on the cranial base was used to assess positional or remodeling changes in the anatomic regions of interest. Surface distance displacements were visually displayed and quantified by 3-dimensional color maps. A 1-sample t test was used to assess the average postsurgical changes of each region of interest. The level of significance was set at 0.05. RESULTS: After antero-inferior chin displacement with surgery (mean, 6.81 +/- 3.2 mm at splint removal), the average 1-year postsurgery displacement was not statistically significant (P = 0.44). Postsurgical adaptations greater than 2 mm were observed in 48% of the patients: 16% with an additional anterior-inferior displacement of the chin of 2 to 4 mm, and 4% with >or= 4 mm; 20% had postero-superior movement of 2 to 4 mm, and 8% had postero-superior movement of >or= 4 mm. The condyles tended to move, on average, <or= 2 mm supero-posteriorly with surgery, and this small positional displacement was maintained 1 year postsurgery (right condyle, P = 0.58; left, P = 0.88). The rami exhibited outward (lateral) movements with surgery, with greater displacement of the inferior part of the rami (2 mm in 65% of the subjects). This torque of the ramus with surgery was stable 1 year postsurgery. CONCLUSIONS: Three-dimensional assessment of skeletal changes with mandibular advancement surgery shows that nearly half of the patients have >2 mm change in chin position from splint removal to the 1-year follow-up, with approximately equal chances of anterior and posterior movement. Torque of the rami usually occurs with mandibular advancement surgery. Copyright 2010 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.
Authors: F Bookstein; K Schäfer; H Prossinger; H Seidler; M Fieder; C Stringer; G W Weber; J L Arsuaga; D E Slice; F J Rohlf; W Recheis; A J Mariam; L F Marcus Journal: Anat Rec Date: 1999-12-15
Authors: Jonas P Becktor; Joe Rebellato; Karin B Becktor; Sten Isaksson; Phillip D Vickers; Eugene E Keller Journal: J Oral Maxillofac Surg Date: 2002-04 Impact factor: 1.895
Authors: Cecilia Ponce-Garcia; Manuel Lagravere-Vich; Lucia Helena Soares Cevidanes; Antonio Carlos de Olivera Ruellas; Jason Carey; Carlos Flores-Mir Journal: Angle Orthod Date: 2017-11-30 Impact factor: 2.079
Authors: Alexandre T Motta; Lucia H S Cevidanes; Felipe A R Carvalho; Marco A O Almeida; Ceib Phillips Journal: J Oral Maxillofac Surg Date: 2011-01-21 Impact factor: 1.895
Authors: L R Gomes; L H Cevidanes; M R Gomes; A C Ruellas; D P Ryan; B Paniagua; L M Wolford; J R Gonçalves Journal: Int J Oral Maxillofac Surg Date: 2017-07-17 Impact factor: 2.789
Authors: Liliane Rosas Gomes; Lúcia Helena Soares Cevidanes; Marcelo Regis Gomes; Antônio Carlos de Oliveira Ruellas; Daniel Patrick Obelenis Ryan; Beatriz Paniagua; Larry Miller Wolford; João Roberto Gonçalves Journal: Am J Orthod Dentofacial Orthop Date: 2018-08 Impact factor: 2.650
Authors: L K de Paula; A C O Ruellas; B Paniagua; M Styner; T Turvey; H Zhu; J Wang; L H S Cevidanes Journal: Int J Oral Maxillofac Surg Date: 2013-02-08 Impact factor: 2.789
Authors: Alexandre A Franco; Lucia Helena S Cevidanes; Ceib Phillips; Paul Emile Rossouw; Timothy A Turvey; Felipe de Assis R Carvalho; Leonardo K de Paula; Cátia Cardoso A Quintão; Marco Antonio O Almeida Journal: J Oral Maxillofac Surg Date: 2013-06-14 Impact factor: 1.895