The Activity Pattern of the Inferior Head of Lateral Pterygoid Muscle.

Ueda, Ryutaro

doi:10.2186/jjps.36.94

Cited by 5 publications

(4 citation statements)

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“…MMFP values demonstrated that only the dolichofacial group presented reduced values ( P <0.05), about 2.5 times inferior to those of brachyfacial subjects. The onset of lateral pterygoid activity was delayed in jaw opening as compared to jaw protrusion 27 . During protrusion, both lateral and medial pterygoids are active, which results in decreased transverse arch dimensions, due to their action on the ascending mandibular ramus 27 .…”

Section: Discussionmentioning

confidence: 89%

“…The onset of lateral pterygoid activity was delayed in jaw opening as compared to jaw protrusion 27 . During protrusion, both lateral and medial pterygoids are active, which results in decreased transverse arch dimensions, due to their action on the ascending mandibular ramus 27 . Therefore, the medial pterygoid activity of dolichofacial subjects could be decreased similarly to the lower values observed for masseter and temporal muscles, while action of lateral pterygoid muscle seems to be shortened.…”

Section: Discussionmentioning

confidence: 89%

“…The action of jaw muscles can generate interocclusal forces responsible for elastic flexure of the mandible and significant clinical modification of posterior sections of the lower arch during stomatognathic functioning 14 . Muscular contraction without tooth contact results in narrowing of the arch during opening and protrusion, and an increase during mandibular retrusion 10 , 27 , 30 . In contrast, during tooth contact the mandible can twist due to eversion of the masseteric processes, causing medial displacement of the coronoid processes 13 , 30 .…”

Section: Introductionmentioning

confidence: 99%

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Occlusal force, electromyographic activity of masticatory muscles and mandibular flexure of subjects with different facial types

et al. 2011

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ObjectiveThe aim of this study was to evaluate whether vertical facial patterns influence maximal occlusal force (MOF), masticatory muscle electromyographic (EMG) activity, and medial mandibular flexure (MMF).Material and MethodsSeventy-eight dentate subjects were divided into 3 groups by Ricketts's analysis: brachyfacial, mesofacial and dolychofacial. Maximum occlusal force in the molar region was bilaterally measured with a force transducer. The electromyographic activities of the masseter and anterior temporal muscles were recorded during maximal voluntary clenching. Medial mandibular flexure was calculated by subtracting the intermolar distance of maximum opening or protrusion from the distance in the rest position. The data were analyzed using ANOVA followed by Tukey's HSD test. The significance level was set at 5%.ResultsData on maximum occlusal force showed that shorter faces had higher occlusal forces (P<0.0001). Brachyfacial subjects presented higher levels of masseter electromyographic activity and medial mandibular flexure, followed by the mesofacial and dolychofacial groups. Additionally, dolychofacial subjects showed significantly lower electromyographic temporalis activities (P<0.05).ConclusionWithin the limitations of the study, it may be concluded that maximum occlusal force, masticatory muscle activity and medial mandibular flexure were influenced by the vertical facial pattern.

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Occlusal force, electromyographic activity of masticatory muscles and mandibular flexure of subjects with different facial types

et al. 2011

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“…Ueda R in 1992 22 reported that there was no significant difference in lateral pterygoid activity between maximum opening and protrusion which implied that lateral pterygoid is not solely responsible for mandibular distortion during jaw movement.…”

Section: Ijoicrmentioning

confidence: 99%

Medial Mandibular Flexure: A Review of Concepts and Consequences

Aparna¹,

Balakrishnan²,

Gupta³

et al. 2011

International Journal of Oral Implantology &Amp; Clinical Research

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Mandible is a long bone which is bent in the form of a 'U' or bow, supported and articulated with the cranium by means of muscles and ligaments. These muscles, tendons and ligaments attached to the mandible exert force, which causes change in the shape of the mandible at different levels of movement of the jaws. A medial flexure of mandible occurs during wide opening of mouth with the amount of flexure depending on the degree of jaw movement. This mandibular flexure, though minimal, has a profound influence on cross-arch restorations and patients with subperiosteal implants. This article describes the various facts and consequences of mandibular flexure.

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