Effects of the unilateral removal and dissection of the masseter muscle on the facial growth of young rats

Rodrigues, Lucimar; Traina, Andréia Aparecida; Nakamai, Luiz Felipe; Luz, João Gualberto de Cerqueira

doi:10.1590/s1806-83242009000100015

Cited by 17 publications

(10 citation statements)

References 20 publications

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“…bone apposition on the posterior, inferior and lateral borders of the mandible. 23 In sum, studies have demonstrated that the lateral pterygoid muscle has an effect on the growth of the condylar process, 24 the masseter muscle has an effect on the angular process, 16 and the temporal muscle has an effect on the growth of both the coronoid process 5 and the entire mandibular ramus and body, as demonstrated.…”

Section: Discussionmentioning

confidence: 91%

“…The possibility of maxillary growth influencing mandibular growth and vice versa by occlusal intercuspation has been described. 1,16 Occlusal disturbances have been described as the main cause of asymmetry of the maxilla after experimental fractures 17 and as a complication of condylar fractures. 18 Cephalometric evaluations based on radiographs of the skulls and hemimandibles of dissected specimens using a computerized system lead to reliable measurements.…”

Section: Discussionmentioning

confidence: 99%

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Effects of temporal muscle detachment and coronoidotomy on facial growth in young rats

2012

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This study analyzed the effects of unilateral detachment of the temporal muscle and coronoidotomy on facial growth in young rats. Thirty one-month-old Wistar rats were distributed into three groups: detachment, coronoidotomy and sham-operated. Under general anesthesia, unilateral detachment of the temporal muscle was performed for the detachment group, unilateral coronoidotomy was performed for the coronoidotomy group, and only surgical access was performed for the sham-operated group. The animals were sacrificed at three months of age. Their soft tissues were removed, and the mandible was disarticulated. Radiographic projections-axial views of the skulls and lateral views of hemimandibles-were taken. Cephalometric evaluations were performed, and the values obtained were submitted to statistical analyses. There was a significant homolateral difference in the length of the premaxilla, height of the mandibular ramus and body, and the length of the mandible in all three groups. However, comparisons among the groups revealed no significant differences between the detachment and coronoidotomy groups for most measurements. It was concluded that both experimental detachment of the temporal muscle and coronoidotomy during the growth period in rats induced asymmetry of the mandible and affected the premaxilla.

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Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Effects of temporal muscle detachment and coronoidotomy on facial growth in young rats

2012

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“…These results may be explained by previous studies that found asymmetric activity of masticatory muscles and differences in condyle position within the fossa between the crossbite side and non-crossbite side in patients with PUXB. 4,[20][21][22][23][24] So far, it was claimed that optimal masticatory muscle force during growth was necessary for normal mandibular growth 25 and that masticatory muscle function was a determinant of bone quality in the growing mandible. 21 In this respect, previous studies demonstrated that mandibular asymmetry can result after experimental unilateral muscle removal or after resection.…”

Section: Discussionmentioning

confidence: 99%

“…21 In this respect, previous studies demonstrated that mandibular asymmetry can result after experimental unilateral muscle removal or after resection. 23,24 Asymmetric postural and functional activity of the masticatory muscles has been recorded by surface electromyography measurements in patients with PUXB. 20 This asymmetric activity causes a thinner masseter muscle on the crossbite side.…”

Section: Discussionmentioning

confidence: 99%

Three-dimensional analysis of mandibular functional units in adult patients with unilateral posterior crossbite: A cone beam study with the use of mirroring and surface-to-surface matching techniques

Leonardi

Muraglie

Bennici³

et al. 2019

The Angle Orthodontist

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Objectives: To use three-dimensional (3D) mirroring and surface-to-surface techniques to determine any differences in mandibular functional unit shape and morphology between the crossbite side and non-crossbite side in adult patients with posterior unilateral crossbite who had not received any corrective treatment for malocclusion. Materials and Methods: Cone-beam computed tomography (CBCT) records from 24 consecutive adult white patients (mean age, 27.5 years; range 22.6–39.7 years; 14 women and 10 men) seeking treatment for maxillary transverse deficiency were assessed in this study. The control group comprised CBCT scans from age- and sex-matched patients. Segmentation masks were generated to obtain 3D surface mesh models of the mandibles and analyze the six skeletal functional units, which were further analyzed with reverse engineering software. Results: Statistically significant differences in the mean surface distance when comparing the study sample and the control sample were found at the condylar process, mandibular ramus, angular process (P ≤ .0001), and alveolar process (P ≤ .01); no statistically significant differences were found for the coronoid process, the chin, and the mandibular body (P ≥ .5). Conclusions: The condylar, angular, and alveolar processes plus the mandibular ramus appear to play a more dominant role than did the body, the coronoid, and the chin units in the asymmetry of the mandible in patients with unilateral crossbite.

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“…In mammalian models, various jaw/skull deformations have been induced by surgical resection, 50 detachment, or repositioning of the jaw muscles and/or bones (Bayram et al, 2010;Gomes et al, 2012;51 Horowitz and Shapiro, 1955;Lifshitz, 1976;Miyazaki et al, 2016;Rodrigues et al, 2009;Sarnat, 52 1970; Sarnat and Muchnic, 1971;Toledo et al, 2014). These manipulations occurred well after the 53 formation of the jaw skeleton and muscles, and the jaws remained partially functional because of 54 unilateral operations or non-comprehensive disruption.…”

Section: Introduction 24mentioning

confidence: 99%

nkx3.2mutant zebrafish accommodate jaw joint loss through a phenocopy of the head shapes of Paleozoic jawless fish

Miyashita

Baddam

Smeeton

et al. 2019

Preprint

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The vertebrate jaw is a versatile feeding apparatus that facilitated explosive diversification. To function, it requires a joint between the upper and lower jaws, so jaw joint defects - such as osteoarthritis or even ankylosis - are often highly disruptive and difficult to study. To describe consequences of jaw-joint dysfunction, we engineered two independent null alleles of a single jaw-joint marker gene, nkx3.2, in zebrafish. These mutations caused zebrafish to become functionally jawless via fusion of the upper and lower jaw cartilages (ankylosis). Despite lacking jaw joints, nkx3.2 mutants survive to adulthood and accommodate this defect by: a) remodeling their skulls; and b) altering their behavior from suction feeding to ram feeding. As a result of remodeling, nkx3.2 mutants developed superficial similarities to the skull shapes observed in two lineages of ancient jawless vertebrates (anaspids and furcacaudiid thelodonts), including: a fixed open gape, reduced snout, and enlarged branchial region. However, no homology exists in individual skull elements between these taxa, and most of the modified elements in the mutant zebrafish occur outside known expression domains of nkx3.2. Therefore, we interpret the adult nkx3.2 phenotype not as a reversal to an ancestral state, but as convergence due to similar functional requirement of feeding without moveable jaws. This remarkable convergence strongly suggests that jaw movements themselves dramatically influence the development of jawed vertebrate skulls, which implies that functionally viable skull morphologies are finite, with or without functional jaws. Because nkx3.2 null zebrafish display prominent joint ankylosis, drastically modified skull shape, and altered feeding behaviors, these mutants provide a unique model with which to investigate mechanisms of skeletal remodeling and joint diseases.

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Effects of the unilateral removal and dissection of the masseter muscle on the facial growth of young rats

Cited by 17 publications

References 20 publications

Effects of temporal muscle detachment and coronoidotomy on facial growth in young rats

Effects of temporal muscle detachment and coronoidotomy on facial growth in young rats

Three-dimensional analysis of mandibular functional units in adult patients with unilateral posterior crossbite: A cone beam study with the use of mirroring and surface-to-surface matching techniques

nkx3.2mutant zebrafish accommodate jaw joint loss through a phenocopy of the head shapes of Paleozoic jawless fish

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