Anterior Disc Displacement and the Superior Head of Lateral Pterygoid Muscle: A Case-Control Study

The objective of this study was to assess the association between an increase in the proportion of the superior head of the lateral pterygoid muscle (SHLP) inserted into the temporomandibular joint (TMJ) disc and the presence of anterior disc displacement diagnosed by using MRI. We analyzed 75 image...

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Autores principales:	Pompei Filho,Horácio, Suazo Galdames,Iván, Zavando,Daniela, Guimarães,Antonio Sergio
Lenguaje:	English
Publicado:	Sociedad Chilena de Anatomía 2010
Materias:	Temporomandibular joint Lateral pterygoid muscle Articular disc Anterior disc displacement
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200004
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spelling	oai:scielo:S0717-950220100002000042010-10-21Anterior Disc Displacement and the Superior Head of Lateral Pterygoid Muscle: A Case-Control StudyPompei Filho,HorácioSuazo Galdames,IvánZavando,DanielaGuimarães,Antonio Sergio Temporomandibular joint Lateral pterygoid muscle Articular disc Anterior disc displacement The objective of this study was to assess the association between an increase in the proportion of the superior head of the lateral pterygoid muscle (SHLP) inserted into the temporomandibular joint (TMJ) disc and the presence of anterior disc displacement diagnosed by using MRI. We analyzed 75 images of patients with anterior displacement and 75 controls with normal relationship between the mandibular head and the articular tubercle also diagnosed by MRI. Levels of insertion were measured. Descriptive and analytic statistics were calculated. Analyses of differences were made by Fischer's exact test and also were calculated clinical significance (OR, CI = 95%). The average insertion of SHLP was 71.14% (SD 14.13) in controls and 67.80% (SD.16.23) in cases group. The only relationship that presented a significant association (OR 5.61) was found when comparing subjects with a percentage of inserting the disc into the SHLP at 50% with those who had higher levels of insertion (50%). Our results suggest that the highest percentage of insertion serves as a protective factor for anterior disc displacement, probably due to greater control of neuromuscular activity.info:eu-repo/semantics/openAccessSociedad Chilena de AnatomíaInternational Journal of Morphology v.28 n.2 20102010-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200004en10.4067/S0717-95022010000200004
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Temporomandibular joint Lateral pterygoid muscle Articular disc Anterior disc displacement
spellingShingle	Temporomandibular joint Lateral pterygoid muscle Articular disc Anterior disc displacement Pompei Filho,Horácio Suazo Galdames,Iván Zavando,Daniela Guimarães,Antonio Sergio Anterior Disc Displacement and the Superior Head of Lateral Pterygoid Muscle: A Case-Control Study
description	The objective of this study was to assess the association between an increase in the proportion of the superior head of the lateral pterygoid muscle (SHLP) inserted into the temporomandibular joint (TMJ) disc and the presence of anterior disc displacement diagnosed by using MRI. We analyzed 75 images of patients with anterior displacement and 75 controls with normal relationship between the mandibular head and the articular tubercle also diagnosed by MRI. Levels of insertion were measured. Descriptive and analytic statistics were calculated. Analyses of differences were made by Fischer's exact test and also were calculated clinical significance (OR, CI = 95%). The average insertion of SHLP was 71.14% (SD 14.13) in controls and 67.80% (SD.16.23) in cases group. The only relationship that presented a significant association (OR 5.61) was found when comparing subjects with a percentage of inserting the disc into the SHLP at 50% with those who had higher levels of insertion (50%). Our results suggest that the highest percentage of insertion serves as a protective factor for anterior disc displacement, probably due to greater control of neuromuscular activity.
author	Pompei Filho,Horácio Suazo Galdames,Iván Zavando,Daniela Guimarães,Antonio Sergio
author_facet	Pompei Filho,Horácio Suazo Galdames,Iván Zavando,Daniela Guimarães,Antonio Sergio
author_sort	Pompei Filho,Horácio
title	Anterior Disc Displacement and the Superior Head of Lateral Pterygoid Muscle: A Case-Control Study
title_short	Anterior Disc Displacement and the Superior Head of Lateral Pterygoid Muscle: A Case-Control Study
title_full	Anterior Disc Displacement and the Superior Head of Lateral Pterygoid Muscle: A Case-Control Study
title_fullStr	Anterior Disc Displacement and the Superior Head of Lateral Pterygoid Muscle: A Case-Control Study
title_full_unstemmed	Anterior Disc Displacement and the Superior Head of Lateral Pterygoid Muscle: A Case-Control Study
title_sort	anterior disc displacement and the superior head of lateral pterygoid muscle: a case-control study
publisher	Sociedad Chilena de Anatomía
publishDate	2010
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200004
work_keys_str_mv	AT pompeifilhohoracio anteriordiscdisplacementandthesuperiorheadoflateralpterygoidmuscleacasecontrolstudy AT suazogaldamesivan anteriordiscdisplacementandthesuperiorheadoflateralpterygoidmuscleacasecontrolstudy AT zavandodaniela anteriordiscdisplacementandthesuperiorheadoflateralpterygoidmuscleacasecontrolstudy AT guimaraesantoniosergio anteriordiscdisplacementandthesuperiorheadoflateralpterygoidmuscleacasecontrolstudy
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Anterior Disc Displacement and the Superior Head of Lateral Pterygoid Muscle: A Case-Control Study

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