Influence of anthropometry, TMD, and sex on molar bite force in adolescents with and without orthodontic needs

Influence of anthropometry, TMD, and sex on molar bite force in adolescents with and without orthodontic needs

Author Lucas, Barbara de Lima Google Scholar
Barbosa, Tais de Souza Google Scholar
Castelo, Paula Midori Autor UNIFESP Google Scholar
Duarte Gaviao, Maria Beatriz Google Scholar
Abstract Bite force has been studied as representative of functional indices of mastication and its value may have diagnostic significance in disorders of the musculoskeletal system of facial bones. This study aimed to evaluate bite force in adolescents with and without orthodontic needs considering presence of temporomandibular disorders (TMD) as well as anthropometry: craniofacial dimensions and body mass index (BMI). A total of 80 subjects were screened (61 females, 19 males; 18 +/- 3 years old). Unilateral molar bite force was measured using a digital dynamometer with a fork thickness of 12 mm. Direct anthropometry was used to quantify craniofacial measurements. Dental Health Component of the Index of Orthodontic Treatment Need (IOTN-DHC) and the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) were used to classify samples according to malocclusion and to TMD, respectively. Data were analyzed using normality tests, Mann-Whitney U test, and multiple linear regression analyses with stepwise backward elimination, controlling for the presence of malocclusion and TMD (p <= 0.05). The cephalic index was greater in females with malocclusion and the longitudinal cranial diameter was reduced in females with malocclusion. BMI was not different between normal and malocclusion groups for either gender. Bite force was negatively related with vertical dimension of the face, and positively related with facial width and facial index. The model explained 32% of bite force variability, considering the sample size (coefficient of determination R (2) = 0.324). Even when orthodontic needs and TMD signs and symptoms are present, stronger bite force is still observed in males and in subjects with smaller anterior facial heights and wider facial widths.
Keywords Anthropometry
Bite force
Index of Orthodontic Treatment Need
Temporomandibular disorders
xmlui.dri2xhtml.METS-1.0.item-coverage Munich
Language English
Sponsor State of Sao Paulo Research Foundation (FAPESP, SP, Brazil)
Grant number FAPESP: 2010/02020-0
FAPESP: 2010/19616-3
Date 2017
Published in Journal Of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie. Munich, v. 78, n. 6, p. 487-493, 2017.
ISSN 1434-5293 (Sherpa/Romeo, impact factor)
Publisher Urban & Vogel
Extent 487-493
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000414924600005

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