Does head posture have a significant effect on the hyoid bone position and sternocleidomastoid electromyographic activity in young adults?
Author
dc.contributor.author
Valenzuela, Saúl
Author
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Miralles, Rodolfo
Author
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Ravera, María José
Author
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Zúñiga, Claudia
Author
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Santander, Hugo
Author
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Ferrer, Marcelo
Author
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Nakouzi, Jorge
Admission date
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2018-12-20T15:22:35Z
Available date
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2018-12-20T15:22:35Z
Publication date
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2005
Cita de ítem
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Cranio, Volumen 23, Issue 3, 2005, Pages 204-211.
Identifier
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08869634
Identifier
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10.1179/crn.2005.029
Identifier
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https://repositorio.uchile.cl/handle/2250/158916
Abstract
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ABSTRACT: The aim of this study was to evaluate the associations between head posture (head extension, normal head posture, and head flexion) and anteroposterior head position, hyoid bone position,
and the sternocleidomastoid integrated electromyographic (IEMG) activity in a sample of young adults.
The study included 50 individuals with natural dentition and bilateral molar support. A lateral craniocervical radiograph was taken for each subject and a cephalometric analysis was performed. Head posture
was measured by means of the craniovertebral angle formed by the MacGregor plane and the odontoid
plane. According to the value of this angle, the sample was divided into the following three groups: head
extension (less than 95°); normal head posture (between 95° and 106°); and head flexion (more than
106°). The following cephalometric measurements were taken to compare the three groups: anteroposterior head position (true vertical plane/pterygoid distance), anteroposterior hyoid bone position (true vertical plane-Ha distance), vertical hyoid bone position (H-H’ distance in the hyoid triangle), and C0-C2
distance. In the three groups, IEMG recordings at rest and during swallowing of saliva and maximal voluntary clenching were performed by placing bipolar surface electrodes on the right and left sternocleidomastoid muscles. In addition, the condition with/without craniomandibular dysfunction (CMD) in each
group was also assessed. Head posture showed no significant association with anteroposterior head
position, anteroposterior hyoid bone position, vertical hyoid bone position, or sternocleidomastoid IEMG
activity. There was no association to head posture with/without the condition of CMD. Clinical relevance
of the results is discussed.