Effects of twin-block therapy on protrusive muscle functions

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dc.contributor.authorChintakanon, K.
dc.contributor.authorTurker, K.
dc.contributor.authorSampson, W.
dc.contributor.authorWilkinson, T.
dc.contributor.authorTownsend, G.
dc.date.issued2000
dc.description.abstractProtrusive mandibular function, including maximum protrusive force and fatigue time, was investigated in 66 children displaying Class II Division 1 malocclusion. Thirty-two children were treated with the Clark Twin-block appliance and the other 34 children served as untreated controls. The observation period was 6 months. Cross-sectional data based on pretreatment records showed that maximum protrusive force ranged from 18.5 N to 160 N, with a mean of 80.3 +/- 30.7 N. Maximum protrusive force was significantly higher in males than in females (P <.001). The correlation between maximum protrusive force and chronologic age was low (r = 0.20) and did not reach significance. Maximum protrusive force in the group of children with disk displacement was not significantly different from that of the group without disk displacement. Comparison of pretreatment and 6-month records in the untreated control group revealed a significant increase in maximum protrusive force (P <.01) as a result of normal growth, while the measured change in the Twin-block-treated children did not reach significance. Fatiguing the protrusive muscles did not alter mandibular position in the Twin-block group after 6 months of treatment. The present study does not support the lateral pterygoid hypothesis, as there was no evidence of an increase in mandibular protrusive function after treatment with the Twin-block functional appliance.
dc.identifier.citationAmerican Journal of Orthodontics and Dentofacial Orthopedics, 2000; 118(4):392-396
dc.identifier.doi10.1067/mod.2000.109493
dc.identifier.issn0889-5406
dc.identifier.issn1097-6752
dc.identifier.urihttp://hdl.handle.net/2440/1372
dc.language.isoen
dc.publisherMosby Inc
dc.source.urihttps://doi.org/10.1067/mod.2000.109493
dc.subjectPterygoid Muscles
dc.subjectHumans
dc.subjectMalocclusion, Angle Class II
dc.subjectMyofunctional Therapy
dc.subjectReproducibility of Results
dc.subjectBite Force
dc.subjectDental Stress Analysis
dc.subjectOrthodontic Appliances, Functional
dc.subjectOrthodontics, Corrective
dc.subjectMuscle Fatigue
dc.subjectAdolescent
dc.subjectChild
dc.subjectFemale
dc.subjectMale
dc.titleEffects of twin-block therapy on protrusive muscle functions
dc.typeJournal article
pubs.publication-statusPublished

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