PURPOSE: The aim of this study was to quantify masseter @entity121 in @entity1 with masticatory @entity158 . METHODS: Stiffness was measured using shear wave elastography, which expresses stiffness as shear wave velocity (Vs). A phantom study was conducted to confirm the reliability of the measuring device. The study @entity1 were 26 females with bilateral masseter @entity925 who were classified into either Research Diagnostic Criteria for @entity2956 ( @entity20683 / @entity9321 ) group Ia ( @entity158 ; n=13) or @entity20683 / @entity9321 group Ib ( @entity158 with limited opening; n=13). Healthy controls consisted of 24 female volunteers with normal teeth and jaws, who were not classified into groups I/II/III by @entity20683 / @entity9321 . RESULTS: Muscle stiffness was 1.96m/s (12.5kPa) in 13 @entity1 in group Ia, 2.00m/s (13.0kPa) in 13 @entity1 in group Ib and 1.27m/s (5.25kPa) in 24 control subjects. Vs was significantly greater in groups Ia and Ib than in the control group (p<0.05). Characteristic @entity158 intensity (CPI) became clear as an independent factor impacting Vs (partial regression coefficient=0.714; multiple regression analysis , p<0.05). Masseter @entity121 was positively correlated with CPI (p< 0.05) and negatively correlated with maximum assisted mouth opening (p<0.05) and painless mouth opening (p<0.05). CONCLUSION: Shear wave elastography is useful to quantify masticatory @entity121 . Masseter @entity121 of females measured using shear wave elastography was about two-fold greater in group Ia and Ib than in the healthy control group.

Quantitative evaluation of masseter @entity121 in @entity1 with XXXX using shear wave elastography.

@entity1 :: ('9606', 'Species') :: ['participants', 'patients'] @entity9321 :: ('MESH:D049310', 'Disease') :: ['TMD'] @entity2956 :: ('MESH:D013705', 'Disease') :: ['Temporomandibular Disorders'] @entity20683 :: ('MESH:C535684', 'Disease') :: ['RDC'] @entity158 :: ('MESH:D010146', 'Disease') :: ['myofascial pain', 'pain'] @entity925 :: ('MESH:D063806', 'Disease') :: ['muscle pain'] @entity121 :: ('MESH:D009135', 'Disease') :: ['muscle stiffness']
@entity2956 :: (MESH:D013705,Disease) :: ['temporomandibular disorders']
