Open AccessProceedings Article
Occlusal force, electromyographic activity of masticatory muscles and mandibular flexure of subjects with different facial types
William Custodio,Simone Guimarães Farias Gomes,Fernanda Faot,Renata Cunha Matheus Rodrigues Garcia,Altair Antoninha Del Bel Cury +4 more
- 01 Jan 2011
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TL;DR: 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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Abstract: OBJECTIVE: The 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 METHODS: Seventy-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%. RESULTS: Data 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). CONCLUSION: Within 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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References
Maximum occlusal force and medial mandibular flexure in relation to vertical facial pattern: a cross-sectional study
Rosemary Sadami Arai Shinkai,Fabio Luiz Lazzari,Simone de Andrade Canabarro,Márcia Gomes,Márcio Lima Grossi,Luciana Mayumi Hirakata,Eduardo Gonçalves Mota +6 more
TL;DR: The results suggest that MOF and MMF did not vary as a function of vertical facial pattern in this Brazilian sample.
Contributing factors of mandibular deformation during mouth opening.
TL;DR: A multifactorial model showed a significant correlation between the set of predictor variables (symphyseal area, bone density, and mandibular length) andMandibular deformation.
Relationships between the size and spatial morphology of human masseter and medial pterygoid muscles, the craniofacial skeleton, and jaw biomechanics
Alan G. Hannam,W.W. Wood +1 more
TL;DR: In a modern human population so many combinations of biomechanically relevant variables are possible that subjects cannot easily be placed into ideal or nonideal categories for producing molar force, suggesting that there is no simple relationship between the tension-generating capacity of the muscles and their mechanical efficiency.
Fiber-type differences in masseter muscle associated with different facial morphologies.
Anthea Rowlerson,Gwénaël Raoul,Yousif Daniel,John M. Close,Claude-Alain Maurage,Joël Ferri,James J. Sciote +6 more
TL;DR: It is concluded that vertical bite characteristics vary according to the fiber type composition of masseter muscle.
•Dissertation
Avancée mandibulaire dans le syndrome d'apnées obstructives du sommeil : interactions avec l'orthopédie dento-faciale
Julia Cohen-Levy
- 27 Sep 2012
TL;DR: Le traitement par avancee mandibulaire presente ainsi des interactions nombreuses avec l'orthopedie dento-faciale, que ce soit dans l'analyse de l'equilibre architectural du patient, celle des effets secondaires occlusaux generes par les OAM, ou the preparation orthodontique pre-chirurgicale.