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. 2022 May 6;44(1):19.
doi: 10.1186/s40902-022-00350-w.

Does maxillomandibular fixation affect skeletal stability following mandibular advancement? A single-blind clinical trial

Reza Tabrizi  1 , Arash Sarrafzadeh  2 , Shervin Shafiei  1 , Hamidreza Moslemi  1 , Ramtin Dastgir  3
Affiliations

Does maxillomandibular fixation affect skeletal stability following mandibular advancement? A single-blind clinical trial

Reza Tabrizi et al. Maxillofac Plast Reconstr Surg. .

Abstract

Background: The stability of the results remains a significant concern in orthognathic surgeries. This study aimed to assess the amount of relapse following mandibular advancement with/without maxillomandibular fixation (MMF).

Materials and methods: A single-blind clinical trial was conducted on patients with mandibular retrognathism who underwent BSSO for mandibular advancement and Lefort I maxillary superior repositioning. Patients were randomly divided into two groups of treatment (MMF) and control (no MMF). In the treatment group, MMF was performed for 2 weeks; meanwhile, MMF was not performed in the control group, and only guiding elastics were applied postoperatively. Lateral cephalograms were obtained preoperatively (T1), immediately after surgery (T2), and at 1 year postoperatively (T3). The distance from points A and B to the X and Y plane were measured to identify the amount of vertical and horizontal relapse in 1 year as a primary outcome. An independent t-test was applied in order to find differences in outcomes between the control and treatment groups.

Results: Fifty-eight patients were evaluated in two groups (28 patients in the MMF group and 30 in the no-MMF group). The magnitude of mandibular advancement following BSSO was 7.68±1.39 mm and 7.53±1.28, respectively, without significant difference among the groups (p= 0.68). The mean sagittal and vertical changes (relapse) at point B were significantly different between the two groups at 1-year follow-up after the osteotomy (p=0.001 and p=0.05, respectively).

Conclusion: According to the results of this study, patients with short-term MMF following BSSO for mandibular advancement benefit from significantly greater skeletal stability in the sagittal and vertical dimensions.

Keywords: Bilateral sagittal split osteotomy; Orthognathic surgery; Skeletal class II malocclusion.

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Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
Landmarks on lateral cephalograms
See this image and copyright information in PMC

References

    1. Joss CU, Vassalli IM. Stability after bilateral sagittal split osteotomy advancement surgery with rigid internal fixation: a systematic review. J Oral Maxillofac Surg. 2009;67(2):301–313. doi: 10.1016/j.joms.2008.06.060. - DOI - PubMed
    1. Proffit WR, Turvey TA, Phillips C. The hierarchy of stability and predictability in orthognathic surgery with rigid fixation: an update and extension. Head Face Med. 2007;3:21. doi: 10.1186/1746-160X-3-21. - DOI - PMC - PubMed
    1. Tabrizi R, Nili M, Aliabadi E, Pourdanesh F. Skeletal stability following mandibular advancement: is it influenced by the magnitude of advancement or changes of the mandibular plane angle? J Korean Assoc Oral Maxillofac Surg. 2017;43(3):152–159. doi: 10.5125/jkaoms.2017.43.3.152. - DOI - PMC - PubMed
    1. Sato FR, Asprino L, Fernandes Moreira RW, de Moraes M. Comparison of post-operative stability of three rigid internal fixation techniques after sagittal split ramus osteotomy for mandibular advancement. J Craniomaxillofac Surg. 2014;42(5):e224–e229. doi: 10.1016/j.jcms.2013.08.012. - DOI - PubMed
    1. Chen Y, Zhang J, Rao N, Han Y, Ferraro N, August M. Independent risk factors forlong-term skeletal relapse after mandibular advancement with bilateral sagittal split osteotomy. Int J Oral Maxillofac Surg. 2020;49(6):779–786. doi: 10.1016/j.ijom.2019.09.014. - DOI - PubMed

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