The Effect of Orthognathic Surgery on Changes in Masticatory Muscle Volume in Patients With Facial Asymmetry

Although several investigators have reported associations between masticatory muscles and skeletal craniofacial form, there is no agreement on the association. We tested the hypothesis that masticatory muscle volume correlates with the size and form of the adjacent local skeletal sites. For this purpose, we investigated the morphological association of the cross-sectional area and volume of temporal and masseter muscles with zygomatico-mandibular skeletal structures using computerized tomography (CT) in 25 male adults with mandibular prognathism. Muscle variables significantly correlated with widths of the bizygomatic arch and temporal fossa but not with the cranium width. Masseter volume significantly correlated with cross-sectional areas of the zygomatic arch and mandibular ramus. Masseter orientation was almost perpendicular to the zygomatic arch and mandibular antegonial region. The zygomatic arch angle significantly correlated with the antegonial angle. The results of the study suggest that the masticatory muscles exert influence on the adjacent local skeletal sites.

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Management of dentofacial deformities and facial asymmetry with orthognathic surgery concomitant alloplastic temporomandibular joint replacement whit stock prosthesis

International Journal of Oral and Maxillofacial Surgery ◽

10.1016/j.ijom.2017.02.1102 ◽

2017 ◽

Vol 46 ◽

pp. 326-327

Author(s):

B. Mejia ◽

A. Bordoy ◽

A. Jimenez

Keyword(s):

Temporomandibular Joint ◽

Joint Replacement ◽

Orthognathic Surgery ◽

Facial Asymmetry ◽

Dentofacial Deformities

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Two-Stage Treatment of Facial Asymmetry Caused by Unilateral Condylar Hyperplasia

Brazilian Dental Journal ◽

10.1590/0103-6440201302150 ◽

2014 ◽

Vol 25 (3) ◽

pp. 257-260 ◽

Cited By ~ 5

Author(s):

Samuel Porfírio Xavier ◽

Thiago de Santana Santos ◽

Erick Ricardo Silva ◽

Ana Célia Faria ◽

Francisco Verissimo de Mello Filho

Keyword(s):

Orthognathic Surgery ◽

Orthodontic Treatment ◽

Facial Asymmetry ◽

Two Stage ◽

Condylar Head ◽

Condylar Hyperplasia ◽

And Function ◽

Spontaneous Onset

Condylar hyperplasia (CH) is a rare, self-limiting process manifesting between the first and third decades of life. CH causes facial asymmetry and derangement of the occlusion. Management involves resection of the condylar head and orthognathic surgery. This paper describes the case of a 37-year-old woman with spontaneous onset of CH over a span of approximately 25 years. The condition was managed with resection of the condyle alone, which dramatically improved facial asymmetry and altered the occlusion within a few months of follow up. Orthodontic treatment was then carried out and the patient underwent orthognathic surgery after 3 years. The patient is currently satisfied with her appearance and function and there are no signs of recurrence.

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Evaluation of Changes in Muscle Thickness, Bite Force and Facial Asymmetry during Early Treatment of Functional Posterior Crossbite

Journal of Clinical Pediatric Dentistry ◽

10.17796/jcpd.34.4.656rh557093373k4 ◽

2010 ◽

Vol 34 (4) ◽

pp. 369-374 ◽

Cited By ~ 8

Author(s):

Paula Midori Castelo ◽

Maria Beatriz Duarte Gavião ◽

Luciano José Pereira ◽

Leonardo Rigoldi Bonjardim

Keyword(s):

Early Treatment ◽

Repeated Measures ◽

Muscle Thickness ◽

Facial Asymmetry ◽

Bite Force ◽

Mixed Dentition ◽

Stepwise Multiple Regression ◽

Masticatory Muscle ◽

Maxillary Expansion ◽

Posterior Crossbite

Objective: To determine morphological and functional effects on masticatory system of early treatment of functional posterior crossbite in young children. Study design: 23 children were divided into two groups:deciduous (DecG, n=11) and early mixed dentition (MixG, n=12), which received slow maxillary expansion. Maximal bite force, ultrasonographic masticatory muscle thickness and facial asymmetry were evaluated in three stages: before the start of treatment (s1), after three months of retention (s2), and after three months of observation (s3). The results were analyzed by Mann-Whitney U-test, correlation test, repeated measures ANOVA and backward stepwise multiple regression. Results. Bite force and temporalis thickness increased from s1 to s2 and s3 in both groups (p<0.05). Body mass index (BMI) increased significantly from s1 to s3 only in the MixG, but the masseter thickness did not differ among the stages. The correlation between the angle of the eye and the angle of the mouth in relation to the mid-sagital plane increased from s1 to s3. Masticatory muscle thickness contributed significantly to bite force magnitude in all stages, whereas age and BMI showed no significant contribution to its variation. Conclusion: Bite force and temporalis muscle thickness increased significantly in children after early treatment of functional crossbite.

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