Re: re: Mandibular stability using sliding compared with conventional four-hole plates for fixation after bilateral sagittal split ramus osteotomy for mandibular setback

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.

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Biomechanical evaluation of sagittal split ramus osteotomy fixation methods in mandibular setback

International Journal of Oral and Maxillofacial Surgery ◽

10.1016/j.ijom.2017.02.585 ◽

2017 ◽

Vol 46 ◽

pp. 171

Author(s):

Y.F. Wu ◽

M.Y.C. Chen ◽

J.T. Hsu

Keyword(s):

Sagittal Split Ramus Osteotomy ◽

Fixation Methods ◽

Mandibular Setback ◽

Biomechanical Evaluation

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

The Angle Orthodontist ◽

10.2319/040708-199.1 ◽

2009 ◽

Vol 79 (3) ◽

pp. 521-527 ◽

Cited By ~ 5

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.

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Osteossíntese no Tratamento Cirúrgico dos Prognatismos: Estado da Arte

Acta Médica Portuguesa ◽

10.20344/amp.7788 ◽

2017 ◽

Vol 30 (3) ◽

pp. 224

Author(s):

Nuno Durão ◽

José Amarante

Keyword(s):

Relevant Literature ◽

Inferior Alveolar Nerve ◽

Class Iii ◽

Class Iii Malocclusion ◽

Sagittal Split Ramus Osteotomy ◽

Acceptable Alternative ◽

Mandibular Setback ◽

Common Technique ◽

The Stability

Introduction: Prognathism is a common skeletal facial abnormality, associated with class III malocclusion, often with repercussions in quality of life. In addition to orthodontic treatment, sagittal split ramus osteotomy is the most common technique for its correction, and segment osteosynthesis is an important element of the post-surgical outcome.Materials and Methods: A search for relevant literature was conducted in the PubMed/MEDLINE database and in other relevant sources.Results: The stability of different fixation methods, their repercussions on inferior alveolar nerve lesions, and the type of material are among the most researched subjects.Discussion: Recent research about the type of osteosynthesis applied in the sagittal split ramus osteotomy for mandibular setback is discussed.Conclusion: Miniplates appear to be the better option for fixation of sagittal split osteotomy for mandibular setback. Bioabsorbable osteosynthesis may be an acceptable alternative to titanium.

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