Changes in the temporomandibular joint caused by the vertical facial pattern. Study on an experimental model

Monje, Florencio; Delgado, Emilio; Navarro, Martin J.; Miralles, Celia; Hoyo, J.R. Alonso del

doi:10.1016/s1010-5182(05)80118-0

Cited by 19 publications

(25 citation statements)

References 16 publications

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“…15,16 Undersized mandibles are associated with bilateral resections of the masseter muscle. 9,10 However, this study detected a shortening of the whole mandible, probably due to a refi ned mensuration method and to the statistical analyses used. Another signifi cant fi nding was a shortening of the maxilla.…”

Section: Discussionmentioning

confidence: 63%

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

et al. 2009

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This study analyzed the effects of the unilateral removal and dissection of the masseter muscle on the facial growth of young rats. A total of 30 one-month-old Wistar rats were used. Unilateral complete removal of the masseter muscle was performed in the removal group, and detachment followed by repositioning of the masseter muscle was performed in the dissection group, while only surgical access was performed in the sham-operated group. The animals were sacrifi ced at three months of age. Axial radiographic projections of the skulls and lateral projections of the hemimandibles were taken. Cephalometric evaluations were made and the values obtained were submitted to statistical analyses. In the removal group, there were contour alterations of the angular process, and a signifi cant homolateral difference in the length of the maxilla and a signifi cant bilateral difference in the height of the mandibular body and the length of the mandible were observed. Comparison among groups revealed signifi cance only in the removal group. It was concluded that the experimental removal of the masseter muscle during the growing period in rats induced atrophic changes in the angular process, as well as asymmetry of the maxilla and shortening of the whole mandible.

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Section: Discussionmentioning

confidence: 63%

“…9 An open bite occurs in rats after bilateral removal of the masseter. 10 Also, unilateral masticatory function caused asymmetric craniofacial growth. 11 Surgical procedures on the mandible are frequently carried out with muscle detachment.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2009

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“…• In the third and fourth groups, to make the muscular weakness models, the masseter muscles were bilaterally resected at 3 weeks of age, using the same model reported previously by Monje 8 and Yonemitsu et al 10 In brief, before surgery, all animals were deeply anesthetized with diethyl ether and an intraperitoneal injection of 8% chloral hydrate (1 mL/200 g body weight). After shaving the area, the rats were cut open, and the masticatory muscles were visualized.…”

Section: Animal and Tissue Preparationmentioning

confidence: 99%

“…7 Optimal masticatory muscular force during growth is necessary for normal mandibular growth. 8,9 Bilateral resection of the masseter muscles in growing rats resulting in a thinner chondroblastic layer of the condyle and larger mandibular plane angle 10 affects the morphology of the mandibles. 8 Moreover, a close relationship between the morphologic changes of the condyle and TMJ internal derangement 20 has been reported, and patients with temporomandibular arthritis tend to have high angles.…”

Section: Introductionmentioning

confidence: 99%

“…8,9 Bilateral resection of the masseter muscles in growing rats resulting in a thinner chondroblastic layer of the condyle and larger mandibular plane angle 10 affects the morphology of the mandibles. 8 Moreover, a close relationship between the morphologic changes of the condyle and TMJ internal derangement 20 has been reported, and patients with temporomandibular arthritis tend to have high angles. 12 Considering these previous reports, various changes in the TMJ caused by compromised masseter function are believed to correlate with Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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Masseter Muscular Weakness Affects Temporomandibular Synovitis Induced by Jaw Opening in Growing Rats

Ozaki

Kaneko

Soma

2008

The Angle Orthodontist

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Objective: To evaluate the influence of impaired masseter function during growth on the development of temporomandibular synovitis. Materials and Methods: Sixteen 3-week-old male Wistar rats were classified into four groups. The first group served as control; and in the second group, jaw opening was forced for 3 hours when the rats were 9 weeks old. In the third and fourth groups, the masseter muscles were bilaterally resected at 3 weeks of age, and the rats in the fourth group were additionally forced to open their jaw at 9 weeks of age. All rats were sacrificed at 9 weeks. Temporomandibular joint (TMJ) tissue samples were processed for histology, and evaluated for cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS) expressions by immunohistochemistry to examine the inflammatory changes in the synovial membrane. Results: The control group showed noninflammatory changes. In the jaw-opening group, vascular dilation and weak COX-2 immunoreactivity were induced by jaw opening in the synovium. In the masseter-resection group, the masseter-resected rats exhibited moderate synovial changes while in the resection with opening group, the masseter-resected rats revealed more significant inflammatory changes including synovial hyperplasia, dilated vasculature, fibrin deposits, and intense immunoreactivity for COX-2 and iNOS, all caused by jaw opening. Conclusions: These results suggest that masseter activity in the growth period is an important factor in the induction of temporomandibular synovitis.

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Mandibular ramus height and condyle distance asymmetries in individuals with different facial growth patterns: a cone-beam computed tomography study

et al. 2020

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Changes in the temporomandibular joint caused by the vertical facial pattern. Study on an experimental model

Cited by 19 publications

References 16 publications

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

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

Masseter Muscular Weakness Affects Temporomandibular Synovitis Induced by Jaw Opening in Growing Rats

Mandibular ramus height and condyle distance asymmetries in individuals with different facial growth patterns: a cone-beam computed tomography study

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