title: Peripheral, functional and postural asymmetries related to the preferred chewing side in adults with natural dentition.
abstract: The aim of this cross-sectional study was to determine the preferred chewing side and whether chewing side preference is related to peripheral, functional or postural lateral preferences. One hundred and forty-six adults with natural dentition performed three masticatory assays, each consisting of five trials of chewing three pieces of silicon placed into a latex bag for 20 cycles, either freestyle or unilaterally on the right- or left-hand side. Occlusal contact area in the intercuspal position, maximum bite force, masticatory performance and cycle duration were measured and the lateral asymmetry of these variables was calculated. Laterality tests were performed to determine handedness, footedness, earedness and eyedness as functional preferences, and hand-clasping, arm-folding and leg-crossing as postural lateral preferences. The preferred chewing side was determined using three different methods: assessment of the first chewing cycle for each trial, calculation of the asymmetry index from all cycles and application of a visual analogue scale. Bivariate relationship and multiple linear regression analyses were performed. Among unilateral chewers, 77% of them preferred the right side for chewing. The factors most closely related to the preferred chewing side were asymmetry of bite force, asymmetry of masticatory performance and earedness, which explained up to 16% of the variance. Although several functional or postural lateral preferences seem to be related to the preferred chewing side, peripheral factors such as asymmetry of bite force and of masticatory performance are the most closely related to the preferred chewing side in adults with natural dentition.
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, University of Barcelona, Barcelona, Spain.|Oral Health and Masticatory System Group (Bellvitge Biomedical Research Institute) IDIBELL, L'Hospitalet de Llobregat, Barcelona, Spain.
authors.forename: B
authors.initials: B
authors.lastname: Rovira-Lastra
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, University of Barcelona, Barcelona, Spain.|Department of Prosthodontics, Faculty of Dentistry, Autonomous University of Nayarit, Nayarit, Mexico.
authors.forename: E I
authors.initials: EI
authors.lastname: Flores-Orozco
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, University of Barcelona, Barcelona, Spain.|Oral Health and Masticatory System Group (Bellvitge Biomedical Research Institute) IDIBELL, L'Hospitalet de Llobregat, Barcelona, Spain.
authors.forename: R
authors.identifier: http://orcid.org/0000-0002-8090-0564
authors.initials: R
authors.lastname: Ayuso-Montero
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, University of Barcelona, Barcelona, Spain.|Oral Health and Masticatory System Group (Bellvitge Biomedical Research Institute) IDIBELL, L'Hospitalet de Llobregat, Barcelona, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Peraire
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, University of Barcelona, Barcelona, Spain.|Oral Health and Masticatory System Group (Bellvitge Biomedical Research Institute) IDIBELL, L'Hospitalet de Llobregat, Barcelona, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Martinez-Gomis
mesh_terms: D000328:Adult; D001732:Bite Force; D003430:Cross-Sectional Studies; D003766:Dental Occlusion; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D007574:Jaw Relation Record / Q000379:methods*; D008297:Male; D008409:Mastication / Q000502:physiology*; D008875:Middle Aged; D015203:Reproducibility of Results; D013030:Spain / Q000453:epidemiology; D055815:Young Adult
keywords: cross-sectional studies; functional later-ality; humans; lateral preference; mastication; regression analysis