Thursday, January 28, 2021

Association between declines in objective masticatory performance and salivary stress markers: The Suita study

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Abstract

Dentists often encounter patients suffering from psychological and social stress due to declines in masticatory performance, making this a critical issue to manage. We aimed to clarify the relationships between salivary stress markers as objective indices of chronic stress and objective masticatory performance in a general urban Japanese population. Data from 880 participants (mean age, 65.8 years) in the Suita study were used. Salivary interleukin (IL)‐6 and cortisol concentrations were measured by enzyme‐linked immunosorbent assay. Objective masticatory performance was determined by measuring the increase in surface area test gummy jelly after 30 times chewing. Participants were divided into two groups based on masticatory performance: a decreased group (lowest quartile) and a non‐decreased group (second to fourth quartiles). Odds ratios (ORs) of higher salivary levels of stress markers (highest quartile) according to masticatory performance were estimated using logis tic regression analysis adjusting for age, sex, periodontal status, salivary flow rate and smoking habit. Salivary IL‐6 level was significantly higher in the decreased group than in the non‐decreased group. Logistic regression analysis showed the adjusted OR for higher salivary IL‐6 was significantly higher in the decreased group than in the non‐decreased group (OR = 1.92; 95% confidence interval = 1.33‐2.76; P < .001). No significant associations were found between salivary cortisol and decreased masticatory performance in any analyses. Declines in objective masticatory performance may correlate with higher salivary IL‐6 level as an objective index of chronic stress.

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