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Comparisons of Jaw Line and Face Line after Mandibular Setback: Intraoral Vertical Ramus versus Sagittal Split Ramus Osteotomies

BACKGROUND: This study investigates the differences in the lateral profile and frontal appearance after sagittal split ramus osteotomy (SSRO) and intraoral vertical ramus osteotomy (IVRO) procedures for the correction of mandibular prognathism. METHODS: Sixty patients (30 SSRO and 30 IVRO) underwent...

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Autores principales: Chen, Chun-Ming, Tseng, Yu-Chuan, Ko, Edward Chengchuan, Chen, Michael Yuan-Chien, Chen, Kwei-Jing, Cheng, Jung-Hsuan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Hindawi 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6312596/
https://www.ncbi.nlm.nih.gov/pubmed/30662900
http://dx.doi.org/10.1155/2018/1375085
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author Chen, Chun-Ming
Tseng, Yu-Chuan
Ko, Edward Chengchuan
Chen, Michael Yuan-Chien
Chen, Kwei-Jing
Cheng, Jung-Hsuan
author_facet Chen, Chun-Ming
Tseng, Yu-Chuan
Ko, Edward Chengchuan
Chen, Michael Yuan-Chien
Chen, Kwei-Jing
Cheng, Jung-Hsuan
author_sort Chen, Chun-Ming
collection PubMed
description BACKGROUND: This study investigates the differences in the lateral profile and frontal appearance after sagittal split ramus osteotomy (SSRO) and intraoral vertical ramus osteotomy (IVRO) procedures for the correction of mandibular prognathism. METHODS: Sixty patients (30 SSRO and 30 IVRO) underwent mandibular setback surgery. Serial cephalograms were obtained: (1) T1: approximately 1 month before surgery; (2) T2: at least 6 months after surgery for SSRO and at least 1 year after surgery for IVRO. The landmarks, linear distances, and related angles were measured. The t-test was applied to the intragroup and intergroup comparisons. The null hypothesis was that SSRO and IVRO made no difference in the facial appearance. RESULTS: In the IVRO group, the ramus and gonial widths significantly decreased by 3.9 mm and 5.8 mm, respectively. SSRO significantly reduced the gonial angle by 2.6°, and IVRO increased it significantly by 5.3°. The postoperative increases at frontal bone levels 0 and 1 after IVRO were significantly larger than those after SSRO, but, at level 3, the increases after SSRO were larger than those after IVRO. In the frontal muscular and facial planes, SSRO and IVRO presented no difference. The frontal jaw angle and face angle were significantly larger with IVRO than with SSRO. Therefore, the null hypothesis was rejected. CONCLUSIONS: The ramus width and gonial width were significantly decreased in IVRO compared to SSRO. IVRO increased angles in the lateral profile (gonial angle and mandibular plane angle) and frontal appearance (jaw angle and face angle) more than SSRO did.
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spelling pubmed-63125962019-01-20 Comparisons of Jaw Line and Face Line after Mandibular Setback: Intraoral Vertical Ramus versus Sagittal Split Ramus Osteotomies Chen, Chun-Ming Tseng, Yu-Chuan Ko, Edward Chengchuan Chen, Michael Yuan-Chien Chen, Kwei-Jing Cheng, Jung-Hsuan Biomed Res Int Research Article BACKGROUND: This study investigates the differences in the lateral profile and frontal appearance after sagittal split ramus osteotomy (SSRO) and intraoral vertical ramus osteotomy (IVRO) procedures for the correction of mandibular prognathism. METHODS: Sixty patients (30 SSRO and 30 IVRO) underwent mandibular setback surgery. Serial cephalograms were obtained: (1) T1: approximately 1 month before surgery; (2) T2: at least 6 months after surgery for SSRO and at least 1 year after surgery for IVRO. The landmarks, linear distances, and related angles were measured. The t-test was applied to the intragroup and intergroup comparisons. The null hypothesis was that SSRO and IVRO made no difference in the facial appearance. RESULTS: In the IVRO group, the ramus and gonial widths significantly decreased by 3.9 mm and 5.8 mm, respectively. SSRO significantly reduced the gonial angle by 2.6°, and IVRO increased it significantly by 5.3°. The postoperative increases at frontal bone levels 0 and 1 after IVRO were significantly larger than those after SSRO, but, at level 3, the increases after SSRO were larger than those after IVRO. In the frontal muscular and facial planes, SSRO and IVRO presented no difference. The frontal jaw angle and face angle were significantly larger with IVRO than with SSRO. Therefore, the null hypothesis was rejected. CONCLUSIONS: The ramus width and gonial width were significantly decreased in IVRO compared to SSRO. IVRO increased angles in the lateral profile (gonial angle and mandibular plane angle) and frontal appearance (jaw angle and face angle) more than SSRO did. Hindawi 2018-12-18 /pmc/articles/PMC6312596/ /pubmed/30662900 http://dx.doi.org/10.1155/2018/1375085 Text en Copyright © 2018 Chun-Ming Chen et al. https://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Chen, Chun-Ming
Tseng, Yu-Chuan
Ko, Edward Chengchuan
Chen, Michael Yuan-Chien
Chen, Kwei-Jing
Cheng, Jung-Hsuan
Comparisons of Jaw Line and Face Line after Mandibular Setback: Intraoral Vertical Ramus versus Sagittal Split Ramus Osteotomies
title Comparisons of Jaw Line and Face Line after Mandibular Setback: Intraoral Vertical Ramus versus Sagittal Split Ramus Osteotomies
title_full Comparisons of Jaw Line and Face Line after Mandibular Setback: Intraoral Vertical Ramus versus Sagittal Split Ramus Osteotomies
title_fullStr Comparisons of Jaw Line and Face Line after Mandibular Setback: Intraoral Vertical Ramus versus Sagittal Split Ramus Osteotomies
title_full_unstemmed Comparisons of Jaw Line and Face Line after Mandibular Setback: Intraoral Vertical Ramus versus Sagittal Split Ramus Osteotomies
title_short Comparisons of Jaw Line and Face Line after Mandibular Setback: Intraoral Vertical Ramus versus Sagittal Split Ramus Osteotomies
title_sort comparisons of jaw line and face line after mandibular setback: intraoral vertical ramus versus sagittal split ramus osteotomies
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6312596/
https://www.ncbi.nlm.nih.gov/pubmed/30662900
http://dx.doi.org/10.1155/2018/1375085
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