This study aimed to examine the relationship between oral health and social activity, and explore the mediating effect of depressive symptoms on the relationship between oral health and social activity among community-dwelling older adults in Korea.Methods: A total of 5033 community-dwelling older adults aged ≥65 years were included in the analysis. Data were obtained from the seventh wave (2018) of the Korean Longitudinal Study of Aging. Descriptive statistics, Pearson's correlation analysis and path analysis for mediation analysis were used.Results: Path analysis showed that older adults with better oral health had more social activities (β = 0.177, P < 0.001) and fewer depressive symptoms (β = À0.174, P < 0.001). Depressive symptoms had a mediating role partially in the relationship between oral health and social activity (β = 0.014, P < 0.001). The results of in-depth exploration using oral health subdomains showed that physical oral function and oral pain or discomfort were directly related to the social activity (β = 0.083 and β = 0.149, respectively) and indirectly mediated by depressive symptoms (β = 0.006 and β = 0.004, respectively). However, psychosocial oral function only had an indirect effect on social activity mediated by depressive symptoms (β = 0.006, P = 0.005).Conclusions: Better oral health had a significant association with higher levels of social activities, which was partially mediated by decreased depressive symptoms. It is necessary to pay more attention to oral health promotion for older adults to decrease depressive symptoms and increase participation in social activities.
ZnO nanorods (NRs) decorated with Ni nanoparticles were synthesized using a template-free electrochemical deposition in an ultra-dilute aqueous electrolyte and a subsequent galvanic reaction. The electrochemical properties of the ZnO NRs as an anode material for rechargeable Li-ion batteries were evaluated for different binder morphologies (film and close-packed spherical particles) of polyvinylidene fluoride (PVDF). Results showed that the close-packed spherical PVDF simultaneously improved electrochemical capacity and cyclability because the free-volume between the spherical PVDF helped to accommodate the volume change in the anode caused by the Li ions discharge and charge processes. Furthermore, the Ni nanoparticles decorated on the surface of ZnO NRs enhanced the electrical conductivity of the ZnO NR anode, which enabled faster electronic and ionic transport at the interface between the electrolyte and the electrode, resulting in improved electrochemical capacity. The free-volume formed by the close-packed spherical PVDF, and the decoration of metal nanoparticles are expected to provide insight on the simultaneous improvement of electrochemical capacity and cyclability in other metal oxide anode nanostructures.
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