{"id":{"repo_id":"umkc","oai_identifier":"oai:mospace.umsystem.edu:10355/16208"},"canonical_url":"https://search.dev.ndltd.org/etd/umkc/oai:mospace.umsystem.edu:10355/16208","repository":{"repo_id":"umkc","name":"University of Missouri - Kansas City","base_url":"https://mospace.umsystem.edu/oai/request"},"display":{"title":"Jaw mechanics and muscle behavior in adolescents with different craniofacial morphologies","abstract":"Jaw mechanics and muscle behavior were evaluated in ten dolichofacial versus ten brachyfacial adolescents. Subjects consented to participate. Numerical modeling predicted TMJ loads for molar biting angles based on minimization of muscle effort and subjects' anatomical geometries (from cephalograms and jaw-tracking). Joint loads were compared via response surface regressions and F tests (α=0.05) determined between-group differences. Surface masseter and anterior temporalis electromyography were recorded, unilaterally over two days and nights and bilaterally at two laboratory sessions when subjects did biting tasks to calibrate field recordings. Muscle duty factors were calculated for magnitude (%electromyography/20N bite) and duration thresholds and between-group differences evaluated using repeated measures ANOVA and Tukey-Kramer post hoc tests. Ipsilateral TMJ loads were 9% or larger in dolichofacial than brachyfacial subjects about seventeen-fold more frequently. Masseter muscles were significantly more active in dolichofacial compared to brachyfacial subjects by three-fold at thresholds of 5% (P<0.01) and 10% (P<0.05). This abstract of 148 words is approved as to form and content.","abstract_html":"Jaw mechanics and muscle behavior were evaluated in ten dolichofacial versus ten brachyfacial adolescents. Subjects consented to participate. Numerical modeling predicted TMJ loads for molar biting angles based on minimization of muscle effort and subjects&#x27; anatomical geometries (from cephalograms and jaw-tracking). Joint loads were compared via response surface regressions and F tests (α=0.05) determined between-group differences. Surface masseter and anterior temporalis electromyography were recorded, unilaterally over two days and nights and bilaterally at two laboratory sessions when subjects did biting tasks to calibrate field recordings. Muscle duty factors were calculated for magnitude (%electromyography/20N bite) and duration thresholds and between-group differences evaluated using repeated measures ANOVA and Tukey-Kramer post hoc tests. Ipsilateral TMJ loads were 9% or larger in dolichofacial than brachyfacial subjects about seventeen-fold more frequently. Masseter muscles were significantly more active in dolichofacial compared to brachyfacial subjects by three-fold at thresholds of 5% (P&lt;0.01) and 10% (P&lt;0.05). This abstract of 148 words is approved as to form and content.","abstract_has_math":false,"creators":["Williams, Ashlee L."],"institution":"University of Missouri--Kansas City","degree_name":"M.S.","degree_level":"Masters","degree_discipline":"Oral Biology (UMKC)","degree_department":null,"school":null,"contributors":[],"advisors":["Iwasaki, Laura"],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012","date_published":"2012","updated_at":"2026-07-24T05:19:40Z","subjects":[],"languages":["en_US"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10355/16208","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Iwasaki, Laura"]},{"key":"dc:creator","label":"Author","values":["Williams, Ashlee L."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2012-12-17T21:11:42Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2013-12-17T12:15:05Z"]},{"key":"dc:date.issued","label":"Date","values":["2012"]},{"key":"dc:publisher","label":"Institution","values":["University of Missouri--Kansas City"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Oral Biology (UMKC)"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Missouri--Kansas City"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_US"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10355/16208"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Title from PDF of title page, viewed on December 17, 2012","Thesis advisor: Laura Iwasaki","Vita","Includes bibliographic references (p. 94-98)","Thesis (M.S.)--School of Dentistry. 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Ipsilateral TMJ loads were 9% or larger in dolichofacial than brachyfacial subjects about seventeen-fold more frequently. Masseter muscles were significantly more active in dolichofacial compared to brachyfacial subjects by three-fold at thresholds of 5% (P<0.01) and 10% (P<0.05). This abstract of 148 words is approved as to form and content."]},{"key":"dc:title","label":"Title","values":["Jaw mechanics and muscle behavior in adolescents with different craniofacial morphologies"]}]}],"canonical_facts":{"dc:contributor.advisor":["Iwasaki, Laura"],"dc:creator":["Williams, Ashlee L."],"dc:date.accessioned":["2012-12-17T21:11:42Z"],"dc:date.available":["2013-12-17T12:15:05Z"],"dc:date.issued":["2012"],"dc:description":["Title from PDF of title page, viewed on December 17, 2012","Thesis advisor: Laura Iwasaki","Vita","Includes bibliographic references (p. 94-98)","Thesis (M.S.)--School of Dentistry. University of Missouri--Kansas City, 2012"],"dc:description.abstract":["Jaw mechanics and muscle behavior were evaluated in ten dolichofacial versus ten brachyfacial adolescents. Subjects consented to participate. Numerical modeling predicted TMJ loads for molar biting angles based on minimization of muscle effort and subjects' anatomical geometries (from cephalograms and jaw-tracking). Joint loads were compared via response surface regressions and F tests (α=0.05) determined between-group differences. Surface masseter and anterior temporalis electromyography were recorded, unilaterally over two days and nights and bilaterally at two laboratory sessions when subjects did biting tasks to calibrate field recordings. Muscle duty factors were calculated for magnitude (%electromyography/20N bite) and duration thresholds and between-group differences evaluated using repeated measures ANOVA and Tukey-Kramer post hoc tests. Ipsilateral TMJ loads were 9% or larger in dolichofacial than brachyfacial subjects about seventeen-fold more frequently. Masseter muscles were significantly more active in dolichofacial compared to brachyfacial subjects by three-fold at thresholds of 5% (P<0.01) and 10% (P<0.05). This abstract of 148 words is approved as to form and content."],"dc:identifier.uri":["http://hdl.handle.net/10355/16208"],"dc:language.iso":["en_US"],"dc:publisher":["University of Missouri--Kansas City"],"dc:title":["Jaw mechanics and muscle behavior in adolescents with different craniofacial morphologies"],"dc:type":["Thesis"],"thesis:degree_discipline":["Oral Biology (UMKC)"],"thesis:degree_level":["Masters"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Missouri--Kansas City"]},"updated_at":"2026-07-24T05:19:40Z"}