Mechanobehavior and mandibular ramus length in different facial phenotypes

To test the hypotheses that mechanobehavior scores (MBS) were correlated with mandibular ramus lengths (Co-Go) and differed between facial phenotypes. Subjects gave informed consent to participate. Co-Go (mm), mandibular plane angles (SN-GoGn, °), and three-dimensional anatomy were derived from ceph...

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Published inThe Angle orthodontist Vol. 90; no. 6; pp. 866 - 872
Main Authors Riddle, Paige Covington, Nickel, Jeffrey C, Liu, Ying, Gonzalez, Yoly M, Gallo, Luigi M, Conley, R Scott, Dunford, Robert, Liu, Hongzeng, Iwasaki, Laura R
Format Journal Article
LanguageEnglish
Published United States Edward H. Angle Society of Orthodontists 01.11.2020
Subjects
Cephalometry
Dentistry
Face - anatomy & histology
Face - diagnostic imaging
Female
Humans
Male
Mandible - diagnostic imaging
Original
Phenotype
Temporomandibular Joint
Human
TMJ
Craniofacial form
Masticatory muscles
Jaw mechanics
EMG
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Summary:To test the hypotheses that mechanobehavior scores (MBS) were correlated with mandibular ramus lengths (Co-Go) and differed between facial phenotypes. Subjects gave informed consent to participate. Co-Go (mm), mandibular plane angles (SN-GoGn, °), and three-dimensional anatomy were derived from cephalometric radiography or cone beam computed tomography. Temporomandibular joint (TMJ) energy densities (ED) (mJ/mm3) were measured using dynamic stereometry and duty factors (DF) (%) were measured from electromyography, to calculate MBS (= ED2 × DF,) for each TMJ. Polynomial regressions, K-means cluster analysis, and analysis of variance (ANOVA) with Tukey post-hoc tests were employed. Fifty females and 23 males produced replete data. Polynomial regressions showed MBS were correlated with Co-Go (females, R2 = 0.57; males, R2 = 0.81). Cluster analysis identified three groups (P < .001). Dolichofacial subjects, with shorter normalized Co-Go, clustered into two subgroups with low and high MBS compared to brachyfacial subjects with longer Co-Go. SN-GoGn was significantly larger (P < .03) in the dolichofacial subgroups combined (33.0 ± 5.9°) compared to the brachyfacial group (29.8 ± 5.5°). MBS correlated with Co-Go within sexes and differed significantly between brachyfacial and dolichofacial subjects.
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Associate Professor, Department of Oral Diagnostic Sciences, University at Buffalo, School of Dental Medicine, Buffalo, New York, USA.
Private Practice, Leawood, Kansas, USA.
Professor-Provisional, Department of Orthodontics, School of Dentistry, Oregon Health & Science University, Portland, Oregon, USA; and Research Associate Professor, Department of Oral Diagnostic Sciences, University at Buffalo, School of Dental Medicine, Buffalo, New York, USA.
Professor, Physiology and Biomechanics of the Masticatory System, Dental School, Faculty of Medicine, University of Zurich, Zurich, Switzerland.
Assistant Professor, Department of Biostatistics and Epidemiology, College of Public Health, East Tennessee State University, Johnson City, Tennessee, USA.
Private Practice, Washington, Pennsylvania, USA.
Senior Research Associate, Department of Orthodontics, School of Dentistry, Oregon Health & Science University, Portland, Oregon, USA.
Statistician, University of Buffalo Microbiome Center, School of Dental Medicine, Buffalo, New York, USA.
ISSN:0003-3219
1945-7103
DOI:10.2319/032420-217.1