Jaw closing movement and sex differences in temporomandibular joint energy densities
| Autor: | Jeffrey C. Nickel, Ying Liu, Luigi M. Gallo, H. Liu, Laura R. Iwasaki, Yoly Gonzalez, Nicolas Fankhauser |
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| Rok vydání: | 2017 |
| Předmět: |
Adult
Male 0206 medical engineering Computed tomography Temporal Muscle 02 engineering and technology Article Bite Force 03 medical and health sciences 0302 clinical medicine stomatognathic system medicine Image Processing Computer-Assisted Humans Closing (morphology) General Dentistry Orthodontics Sex Characteristics medicine.diagnostic_test Temporomandibular Joint business.industry Masseter Muscle Magnetic resonance imaging 030206 dentistry 020601 biomedical engineering Mr imaging Magnetic Resonance Imaging Healthy Volunteers Temporomandibular joint Biomechanical Phenomena stomatognathic diseases Observational Studies as Topic Biting medicine.anatomical_structure Cross-Sectional Studies Healthy individuals Female Stress Mechanical business |
| Zdroj: | Journal of oral rehabilitation. 45(2) |
| ISSN: | 1365-2842 |
| Popis: | Energy densities (ED, mJ/mm3) quantify mechanical work imposed on articular cartilages during function. This cross-sectional study examined differences in temporomandibular joint (TMJ) ED during asymmetric versus symmetric jaw closing in healthy females versus males. ED component variables were tested for differences between and within sexes for two types of jaw closing. Seventeen female and 17 male subjects gave informed consent to participate. Diagnostic Criteria for Temporomandibular Disorders and images (magnetic resonance (MR), computed tomography) were used to confirm healthy TMJ status. Numerical modeling predicted TMJ loads (Fnormal) consequent to unilateral canine biting. Dynamic stereometry combined MR imaging and jaw tracking data to measure ED component variables during 10 trials of each type of jaw closing in each subject’s TMJs. These data were then used to calculate TMJ ED during jaw closing asymmetrically and symmetrically. Paired and Student’s t-tests assessed ED between jaw closing movements and sexes, respectively. Multivariate data analyses assessed ED component variable differences between jaw closing movements and sexes (α=0.05). Contralateral TMJ ED were 3.6-fold and significantly larger (P |
| Databáze: | OpenAIRE |
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