{"id":{"repo_id":"buffalo","oai_identifier":"oai:ubir.buffalo.edu:10477/79862"},"canonical_url":"https://search.dev.ndltd.org/etd/buffalo/oai:ubir.buffalo.edu:10477/79862","repository":{"repo_id":"buffalo","name":"Buffalo","base_url":"https://ubir.buffalo.edu/oai/request"},"display":{"title":"Mechanobehavior and Mandibular Posterior Vertical Height in Adults of Different Facial Types","abstract":"M.S.","abstract_html":"M.S.","abstract_has_math":false,"creators":["Covington Riddle, Paige"],"institution":"State University of New York at Buffalo","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Conley, Richard","Orthodontics"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-07-30T15:10:34Z","date_published":"2019-07-30T15:10:34Z","updated_at":"2026-07-27T19:05:19Z","subjects":["dentistry"],"languages":["eng"],"rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10477/79862","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Conley, Richard","Orthodontics"]},{"key":"dc:creator","label":"Author","values":["Covington Riddle, Paige"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-07-30T15:10:34Z","2019","2019-03-05 15:20:09"]},{"key":"dc:publisher","label":"Institution","values":["State University of New York at Buffalo"]},{"key":"dc:type","label":"Dc Type","values":["Text","Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["dentistry"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/10477/79862"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["M.S.","OBJECTIVE: To investigate differences in jaw mechanics and behavior in adults with different facial types. METHODS: This retrospective, non-therapeutic, observational, comparative study evaluated relationships between facial types based on 1) Sella-Nasion – Gonion-Gnathion (SN-GoGn) angle, 2) Frankfort Horizontal – Gonion-Menton (FH-GoMe) angle, and 3) Condylion-Gonion (Co-Go) distance (ramal height) from derived lateral cephalograms and their correlation with 1) temporomandibular energy densities (ED), 2) jaw muscle duty factors (DF) collected over three time periods (day, night, overall) at thresholds of ≤2N, and 3) mechanobehavioral scores (MBS = (ED)2 x DF) from ninety-two subjects. All subjects gave informed consent to participate. Inclusion criteria for subjects were male or female adults, age 18 years or older that met the following: 1) were willing to complete all aspects of the study, 2) were relatively symmetrical in terms of the bilateral positions of the dentition and muscles of mastication, 3) anatomy accommodated the research devices and materials used, 4) all first molar, canine, and incisor teeth were present, and 5) no aspect of the medical history contraindicated routine dental procedures. Exclusion criteria for subjects were: 1) known allergies to dental materials such as acrylic or molding material, 2) large dental restorations or cavities, 3) inability to read, 4) inability to follow auditory commands, 5) history of diagnosed musculoskeletal disease (e.g. fibromyalgia, muscular dystrophy) or trauma to the temporomandibular joint (TMJ), 6) evidence of degenerative osseous changes of the TMJ, and 7) pregnancy. Data were analyzed using Pearson coefficient correlation, R2 values, and one-way analysis of variance (ANOVA) followed by Tukey’s Honest Significant Difference post hoc test; statistical significance was defined by p < 0.05. RESULTS: Larger mandibular plane angles (MPA) in males were related to lower mean energy densities, and smaller mandibular plane angles were related to higher mean energy densities. In both the male and female subjects, as the ramal height increased, the mean energy densities increased. Both male and female models for Co-Go versus MBS indicate that as MBS increased, so did ramal height; when MBS values reached approximately 125, the ramal height decreased as the MBS increased. Ramal height for the total population was found to have a statistically significant relationship to DF at low thresholds, 2N, for overall (day/night) recordings (p = 0.029) and for day recordings (p = 0.044). Results revealed 14.9% of the variation of SN-GoGn was attributable to MBS within the male sub-group, which was statistically significant (p = 0.022). Co-Go compared to mechanobehavior scores also produced statistically significant results for the total population and within each gender subgroup (overall, p < 0.001, male, p = 0.001; female, p < 0.001). Results indicated that 25.6% and 29.8% of the variance in ramal height was attributable to the combined effects of EDs and DFs for males (p = 0.001) and females (p < 0.001), respectively."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Mechanobehavior and Mandibular Posterior Vertical Height in Adults of Different Facial Types"]}]}],"canonical_facts":{"dc:contributor":["Conley, Richard","Orthodontics"],"dc:creator":["Covington Riddle, Paige"],"dc:date":["2019-07-30T15:10:34Z","2019","2019-03-05 15:20:09"],"dc:description":["M.S.","OBJECTIVE: To investigate differences in jaw mechanics and behavior in adults with different facial types. METHODS: This retrospective, non-therapeutic, observational, comparative study evaluated relationships between facial types based on 1) Sella-Nasion – Gonion-Gnathion (SN-GoGn) angle, 2) Frankfort Horizontal – Gonion-Menton (FH-GoMe) angle, and 3) Condylion-Gonion (Co-Go) distance (ramal height) from derived lateral cephalograms and their correlation with 1) temporomandibular energy densities (ED), 2) jaw muscle duty factors (DF) collected over three time periods (day, night, overall) at thresholds of ≤2N, and 3) mechanobehavioral scores (MBS = (ED)2 x DF) from ninety-two subjects. All subjects gave informed consent to participate. Inclusion criteria for subjects were male or female adults, age 18 years or older that met the following: 1) were willing to complete all aspects of the study, 2) were relatively symmetrical in terms of the bilateral positions of the dentition and muscles of mastication, 3) anatomy accommodated the research devices and materials used, 4) all first molar, canine, and incisor teeth were present, and 5) no aspect of the medical history contraindicated routine dental procedures. Exclusion criteria for subjects were: 1) known allergies to dental materials such as acrylic or molding material, 2) large dental restorations or cavities, 3) inability to read, 4) inability to follow auditory commands, 5) history of diagnosed musculoskeletal disease (e.g. fibromyalgia, muscular dystrophy) or trauma to the temporomandibular joint (TMJ), 6) evidence of degenerative osseous changes of the TMJ, and 7) pregnancy. Data were analyzed using Pearson coefficient correlation, R2 values, and one-way analysis of variance (ANOVA) followed by Tukey’s Honest Significant Difference post hoc test; statistical significance was defined by p < 0.05. RESULTS: Larger mandibular plane angles (MPA) in males were related to lower mean energy densities, and smaller mandibular plane angles were related to higher mean energy densities. In both the male and female subjects, as the ramal height increased, the mean energy densities increased. Both male and female models for Co-Go versus MBS indicate that as MBS increased, so did ramal height; when MBS values reached approximately 125, the ramal height decreased as the MBS increased. Ramal height for the total population was found to have a statistically significant relationship to DF at low thresholds, 2N, for overall (day/night) recordings (p = 0.029) and for day recordings (p = 0.044). Results revealed 14.9% of the variation of SN-GoGn was attributable to MBS within the male sub-group, which was statistically significant (p = 0.022). Co-Go compared to mechanobehavior scores also produced statistically significant results for the total population and within each gender subgroup (overall, p < 0.001, male, p = 0.001; female, p < 0.001). Results indicated that 25.6% and 29.8% of the variance in ramal height was attributable to the combined effects of EDs and DFs for males (p = 0.001) and females (p < 0.001), respectively."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/10477/79862"],"dc:language":["eng"],"dc:publisher":["State University of New York at Buffalo"],"dc:rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"dc:subject":["dentistry"],"dc:title":["Mechanobehavior and Mandibular Posterior Vertical Height in Adults of Different Facial Types"],"dc:type":["Text","Thesis"]},"updated_at":"2026-07-27T19:05:19Z"}