Changes in the temporomandibular joint after mandibular setback surgery in monkeys: intraoral vertical versus sagittal split ramus osteotomy

2007 ◽  
Vol 104 (3) ◽  
pp. 329-337 ◽  
Author(s):  
Qiang Zhao ◽  
Jing Hu ◽  
Dazhang Wang ◽  
Songsong Zhu
Keyword(s):  
Temporomandibular Joint ◽  
Sagittal Split Ramus Osteotomy ◽  
Mandibular Setback ◽  
Mandibular Setback Surgery

MRI changes in the temporomandibular joint following mandibular setback surgery using sagittal split ramus osteotomy with rigid fixation

CRANIO® ◽  
2016 ◽  
Vol 35 (1) ◽  
pp. 38-45 ◽  
Author(s):  
Namiaki Takahara ◽  
Yuji Kabasawa ◽  
Masaru Sato ◽  
Akemi Tetsumura ◽  
Tohru Kurabayashi ◽  
...  
Keyword(s):  
Temporomandibular Joint ◽  
Rigid Fixation ◽  
Sagittal Split Ramus Osteotomy ◽  
Mandibular Setback ◽  
Mandibular Setback Surgery ◽  
Mri Changes

scholarly journals The Changes of Cheek Line (Lateral) and Face Line (Frontal) after Correction of Mandibular Prognathism

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Yu-Chuan Tseng ◽  
Jung-Hsuan Cheng ◽  
Michael Yuan-Chien Chen ◽  
Kwei-Jing Chen ◽  
Chun-Ming Chen
Keyword(s):  
Null Hypothesis ◽  
Sagittal Split Ramus Osteotomy ◽  
Facial Profile ◽  
Mandibular Prognathism ◽  
Postoperative Change ◽  
Mandibular Setback ◽  
Mandibular Setback Surgery

Objective. The purpose of the present study was to investigate the improvements of facial profile and postoperative stability by single mandibular setback surgery. Materials and Methods. The study included twenty-seven patients who underwent mandibular prognathism correction by sagittal split ramus osteotomy (SSRO). Cephalometric radiograms (lateral and frontal) were collected and analyzed at three intervals: preoperatively (T1), immediately postoperatively (T2), and final follow-up postoperatively (T3). The lateral and frontal cephalometric parameters were measured. The immediate postoperative change (T21), postoperative stability (T32), and final surgical change (T31) were calculated and analyzed. The null hypothesis is that postoperative stability (T32) was not significantly correlated to amount of mandibular setback (T21). Results. The immediate postoperative change (T21) of menton (Me) was significantly backward 8.7 mm. In the final postoperative change (T31), average chin points anterior movements were approximately 0.32 mm. Investigating frontal appearance, inter ramus posterior (InterRp) and intergonion (InterGo) widths were significantly increased with 1.8 and 2.2 mm, respectively. Bilateral ramus angles were not significantly increased, about 1°. The horizontal Me (T32) had significant correlation (p=0.028) with amount of setback (T21). Therefore, null hypothesis is rejected. Conclusion. Postoperative relapse was significantly correlated to the amount of setback. The frontal transverse changes (InterRp and InterGo) were significantly increased.

scholarly journals Disk Position and Temporomandibular Joint Structure Associated with Mandibular Setback in Mandibular Asymmetry Patients

2009 ◽  
Vol 79 (3) ◽  
pp. 521-527 ◽  
Author(s):  
Masayoshi Kawakami ◽  
Kazuhiko Yamamoto ◽  
Tomohiro Inoue ◽  
Atsuhisa Kajihara ◽  
Masaki Fujimoto ◽  
...  
Keyword(s):  
Temporomandibular Joint ◽  
Contralateral Side ◽  
Magnetic Resonance Images ◽  
University Hospital ◽  
Class Iii ◽  
Sagittal Split Ramus Osteotomy ◽  
Skeletal Class ◽  
Mandibular Setback ◽  
Mandibular Asymmetry ◽  
Articular Disk

Abstract Objective: To determine the changes in articular disk position and the temporomandibular joint (TMJ) structure in patients who had an asymmetric setback of the mandible performed by a bilateral sagittal split ramus osteotomy with manual positioning of the condyle. Materials and Methods: Twenty-two patients with skeletal Class III malocclusion being treated at Nara Medical University Hospital were evaluated using clinical examination and pre- and postoperative magnetic resonance images of their TMJs. Results: Changes in articular disk position after asymmetric setback surgery were not statistically significant, although a tendency of anterior displacement in the fossa was noted. The anterior and posterior joint spaces did not show significant changes, whereas the condyle head of the deviated or contralateral side tended to be positioned downward. Conclusion: The asymmetric setback of the mandible with intraoperative manual positioning of the condyle does not significantly change the disk position in the fossa.

scholarly journals Changes in Pharyngeal Airway After Mandibular Setback Surgery: A Retrospective Cephalometric Study

2019 ◽  
Vol 53 (4) ◽  
pp. 256-263
Author(s):  
Jayshree D. Daryanani ◽  
N. Vijay ◽  
K. Sadashiva Shetty ◽  
Riddhi Chawla
Keyword(s):  
Soft Palate ◽  
Sagittal Split Ramus Osteotomy ◽  
Mandibular Prognathism ◽  
Pharyngeal Airway ◽  
Mandibular Setback ◽  
Mandibular Setback Surgery ◽  
Cephalometric Study ◽  
Base Of The Tongue

Aim: To cephalometrically evaluate the alterations taking place in the pharyngeal airway space, hyoid bone, soft palate, and head posture after mandibular setback surgery (bilateral sagittal split osteotomy) for correction of mandibular prognathism, as well as to evaluate the immediate postsurgical and more than 6 months postsurgical adaptations of these structures. Setting and Design: A retrospective cephalometric study. Materials and Method: The study group consisted of 40 nongrowing patients (20 females and 20 males) with mandibular prognathism and ANB less than or equal to –2 degree for which mandibular setback surgery by bilateral sagittal split ramus osteotomy was performed along with fixed appliance therapy. There presurgical (T1), immediate postsurgical (T2), and more than 6 months postsurgical (T3) lateral cephalograms were analyzed. Statistical Analysis Used: Intragroup comparison was done by paired t-test. Results: Skeletal measurements after orthognathic surgery remained stable in the long term. It was evident that mandibular setback surgery narrowed the pharyngeal airway; however, these changes were not significant except at the base of the tongue. During the follow-up airway measurements at the base of the tongue, the intersection of tongue at the inferior border of mandible and the vallecula increased but they did not reach the presurgical values. Soft palate length increased significantly after surgery. Angulation of soft palate to nasal line also increased significantly following surgery but decreased during follow-up. Extension of the head occurred after surgery which was maintained even at long term. Conclusion: Careful analysis of airway should be performed, particularly in connection with large anteroposterior discrepancies and in those who have risk factors for development of obstructive sleep apnea. Such cases should be corrected by combined maxillary and mandibular osteotomies.

Combining Cervicofacial Lipodissection with Orthognathic Surgery: Cosmetic Enhancement

2002 ◽  
Vol 19 (3) ◽  
pp. 159-171
Author(s):  
Bernard B. Dreiman
Keyword(s):  
Soft Tissue ◽  
Adult Patient ◽  
Temporomandibular Joint ◽  
Older Adult ◽  
Cosmetic Surgery ◽  
Orthognathic Surgery ◽  
Patient Evaluation ◽  
Mandibular Setback ◽  
Mandibular Setback Surgery

Introduction: The addition of cervicofacial lipodissection to the procedures used with facial osteotomies has been shown to markedly improve the cosmetics of the cervicofacial complex and the results of orthognathic surgery. Materials and Methods: A technique, including instrumentation, is described as a combination of liposuction and dissection of the tissues, and photographs of 2 surgical cases are included. Results: The benefits of orthognathic surgery and facial osteotomies include improvement of the occlusion, preservation of the dentition, and better function of the temporomandibular joint. Discussion: This article is intended to review the anatomy, patient evaluation, and use of lipodissection to improve the cosmesis of the submandibular and neck tissues. The indications for orthognathic surgery are reviewed. The advantages of cervicofacial lipodissection in correcting the submental, neck, and lateral jowl fullness, which accompanies mandibular setback surgery or reduction genioplasty and neck soft tissue fullness not corrected with orthognathic surgery alone, are reviewed. The cosmetic benefits to the older adult patient with aging in the cervicofacial area are described. The benefits of maxillary and mandibular osteotomies, the shortcomings of facial osteotomies in correcting the adverse cosmesis in the neck and submental areas, and a review of the procedures used in treating neck soft tissue redundancy are discussed. The importance of preoperative soft tissue evaluation and a review of the anatomy is presented. Conclusion: The addition of lipodissection of the cervicofacial areas may result in a greatly improved neck contour. Considering the large number of surgeons performing orthognathic surgery and the increasing number of surgeons interested in cosmetic surgery, this technique combines the 2 surgical modalities.

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

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Chun-Ming Chen ◽  
Yu-Chuan Tseng ◽  
Edward Chengchuan Ko ◽  
Michael Yuan-Chien Chen ◽  
Kwei-Jing Chen ◽  
...  
Keyword(s):  
Null Hypothesis ◽  
Frontal Bone ◽  
Sagittal Split Ramus Osteotomy ◽  
Gonial Angle ◽  
Mandibular Setback ◽  
Mandibular Plane ◽  
Level 3 ◽  
Intraoral Vertical Ramus Osteotomy ◽  
Mandibular Setback Surgery ◽  
Lateral Profile

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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