Relationship between dimensions of muscles of mastication (masseter and lateral pterygoid) and skeletal dimensions: Study of 40 cases

Azaroual, Mohammed Faouzi; Fikri, M.; Abouqal, Rédouane; Benyahya, Hicham; Zaoui, Fatima

doi:10.1016/j.ortho.2013.09.001

Cited by 9 publications

(16 citation statements)

References 24 publications

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“…Evidence already exists linking, for example, changes in the orientation of the bony orbits, the cranial base angle and the angle between the petrous bones with relative differences of brain size [4][5][6][7][8][9][10]. Similarly, differences in the size and force production capabilities of the jaw-closing muscles have been linked to changes in the proportions of, for instance, the face, mandible and calvarium [11][12][13][14][15]. By contrast, there is comparatively little evidence to evaluate the proposition that the demands of the brain and masticatory muscles can pervade interceding adaptations of the skull to influence each other [16].…”

Section: Introductionmentioning

confidence: 99%

“…The investigation reported here extends their myostatin-deficient mouse model approach and evaluates the relationship with measurements of endocranial volume which is more intimately linked to the size of the brain. This study re-evaluates the hypothesis that enlargement of the masticatory muscles constrains enlargement of the underlying brain and its surrounding endocranial cavity by testing the null prediction that-the larger myostatin-deficient mice [22,35] have the same sized, if not slightly larger, endocrania in comparison with wild-types in order to accommodate the increases of brain size needed to service the motor and proprioceptive requirements of a larger number of muscle fibres [14,39]. [23] and were backcrossed for several generations on a C57BL/6J background.…”

Section: Introductionmentioning

confidence: 99%

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Endocranial and masticatory muscle volumes in myostatin-deficient mice

Jeffery

Mendias

2014

R. Soc. open sci.

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Structural and functional trade-offs are integral to the evolution of the mammalian skull and its development. This paper examines the potential for enlargement of the masticatory musculature to limit the size of the endocranial cavity by studying a myostatin-deficient mouse model of hypermuscularity (MSTN−/−). The study tests the null prediction that the larger MSTN−/− mice have larger brains compared with wild-type (WT) mice in order to service the larger muscles. Eleven post-mortem MSTN−/− mice and 12 WT mice were imaged at high resolution using contrast enhanced micro-CT. Masticatory muscle volumes (temporalis, masseter, internal and external pterygoids) and endocranial volumes were measured on the basis of two-dimensional manual tracings and the Cavalieri principle. Volumes were compared using Kruskal–Wallis and Student's t-tests. Results showed that the masticatory muscles of the MSTN−/− mice were significantly larger than in the WT mice. Increases were in the region of 17–36% depending on the muscle. Muscles increased in proportion to each other, maintaining percentages in the region of 5, 10, 21 and 62% of total muscle volume for the external ptyergoid, internal pterygoid, temporalis and masseter, respectively. Kruskal–Wallis and t-tests demonstrated that the endocranial volume was significantly larger in the WT mice, approximately 16% larger on average than that seen in the MSTN−/− mice. This comparative reduction of MSTN−/− endocranial size could not be explained in terms of observer bias, ageing, sexual dimorphism or body size scaling. That the results showed a reduction of brain size associated with an increase of muscle size falsifies the null prediction and lends tentative support to the view that the musculature influences brain growth. It remains to be determined whether the observed effect is primarily physical, nutritional, metabolic or molecular in nature.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Endocranial and masticatory muscle volumes in myostatin-deficient mice

Jeffery

Mendias

2014

R. Soc. open sci.

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“…The volume and dimensions of the chewing muscles have a direct relationship with the bone structures from where the muscles originate (Azaroual et al, 2014). Throughout the years, males have acquired a stronger musculature (Lopez-Capp et al, 2018) than females; hence, such impressions left onto skeletal structures may justify the high degree of sexual dimorphism in human skulls, as previously described in other studies using dry mandibles (Datta et al, 2015;Vinay et al, 2013;Franklin et al, 2008;Indira et al, 2012;Kharoshah et al, 2010;.…”

Section: Discussionmentioning

confidence: 84%

Análises quantitativas em mandíbulas para estimativa do sexo

Bento¹,

Crosato²,

Santiago³

et al. 2021

RSD

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Objetivou-se investigar a aplicabilidade de medidas mandibulares para estimativa do sexo em crânios secos humanos de duas coleções osteológicas brasileiras. Este foi um estudo do tipo diagnóstico, cego, com 471 mandíbulas de 215 mulheres e 256 homens. As variáveis consideradas foram: largura bigonial; largura bicondilar; largura do processo condilar direito/esquerdo; largura do coronóide; distância entre os forames mandibulares; distância entre os forames mentais; distância entre os forames espinhais geniais e os forames mandibulares direito/esquerdo; altura do processo coronóide direito e esquerdo; altura do ramo mandibular direito/esquerdo; espessura mandibular direita/esquerda; espessura mandibular anterior; largura máxima do ramo mandibular direito/esquerdo; largura mínima do ramo mandibular direito/esquerdo; comprimento mandibular; e o ângulo mandibular. A análise discriminante foi realizada para verificar as associações em relação ao sexo, tanto para as medidas individuais quanto para o total. A análise estatística indicou que todas as variáveis apresentaram associação significativa com o sexo. Quando aplicado a homens e mulheres, o método stepwise classificou corretamente 77,50% e 80,20% dos casos, respectivamente, com percentual total de concordância de 78,70%. A altura do ramo mandibular esquerdo (74,80%) e a largura bigonial (77,60%) foram as variáveis com maiores taxas de concordância entre homens e mulheres, respectivamente. Equações foram geradas a partir da análise discriminante para cada variável e uma fórmula única para as seis variáveis que apresentaram maior preferência por sexo. Todas as medidas mandibulares foram estatisticamente diferentes entre os sexos, sugerindo que a mandíbula desempenha um papel importante na antropologia forense como fonte de informação quantitativa para estimativa do sexo.

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“…Computer tomography (CT) studies have also found comparable results with masseter muscle thickness and length showing a negative correlation with the mandibular plane angle (Azaroual et al, 2014).…”

Section: T a B L E 1 Baseline Data For The Sample Of Class Ii Maloccl...mentioning

confidence: 85%

Masseter muscle thickness and vertical cephalometric characteristics in children with Class II malocclusion

Tentolouri

Antonarakis

Georgiakaki

et al. 2022

Clinical & Exp Dental Res

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Background: Masseter muscle thickness and its relationship with vertical craniofacial morphology have been extensively studied in adults, but data on children are lacking.Objective: To examine the association between masseter muscle thickness and vertical cephalometric parameters in a group of Class II malocclusion growing children. Methods:The current study design was retrospective and cross-sectional, looking at a sample of 211 growing children with Class II malocclusion between the ages of 6 and 15 derived from two centers. Ultrasonographic masseter muscle thickness measurements and vertical cephalometric variables, including the gonial angle, were evaluated before any orthodontic treatment had been carried out. Multiple linear regression analysis was used to examine the association between masseter muscle thickness and vertical cephalometric measurements, including age and patient origin as independent variables in the analysis.Results: In the present sample, masseter muscle thickness was found to be independent of sex, but correlated with age, with older children presenting thicker masseter muscles. In the total patient sample, using multiple regression analyses, children with thicker masseter muscles had significantly smaller intermaxillary and gonial angles. No other cephalometric vertical characteristics showed associations with masseter muscle thickness. Conclusion:In growing children with Class II malocclusion, those with thicker masseter muscles are more likely to display smaller intermaxillary and gonial angles respectively.

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Relationship between dimensions of muscles of mastication (masseter and lateral pterygoid) and skeletal dimensions: Study of 40 cases

Cited by 9 publications

References 24 publications

Endocranial and masticatory muscle volumes in myostatin-deficient mice

Endocranial and masticatory muscle volumes in myostatin-deficient mice

Análises quantitativas em mandíbulas para estimativa do sexo

Masseter muscle thickness and vertical cephalometric characteristics in children with Class II malocclusion

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