Department of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan.
Department of Preventive Dentistry, Okayama University Hospital, Okayama 700-8558, Japan.
Int J Environ Res Public Health. 2020 Nov 20;17(22):8623. doi: 10.3390/ijerph17228623.
The long-term effects of secondhand smoke (SHS) on dental caries among Japanese young adults remain unclear. The purpose of this cross-sectional study was to evaluate whether household exposure to SHS is associated with dental caries in permanent dentition among Japanese young adults. The study sample included 1905 first-year university students (age range: 18-19 years) who answered a questionnaire and participated in oral examinations. The degree of household exposure to SHS was categorized into four levels according to the SHS duration: no experience (-), past, current SHS < 10 years, and current SHS ≥ 10 years. Dental caries are expressed as the total number of decayed, missing, and filled teeth (DMFT) score. The relationships between SHS and dental caries were determined by logistic regression analysis. DMFT scores (median (25th percentile, 75th percentile)) were significantly higher in the current SHS ≥ 10 years (median: 1.0 (0.0, 3.0)) than in the SHS-(median: 0.0 (0.0, 2.0)); = 0.001). DMFT ≥ 1 was significantly associated with SHS ≥ 10 years (adjusted odds ratio: 1.50, 95% confidence interval: 1.20-1.87, < 0.001). Long-term exposure to SHS (≥10 years) was associated with dental caries in permanent dentition among Japanese young adults.
二手烟（SHS）对日本年轻成年人龋齿的长期影响尚不清楚。本横断面研究旨在评估家庭 SHS 暴露是否与日本年轻成年人恒牙龋齿有关。研究样本包括 1905 名一年级大学生（年龄范围：18-19 岁），他们回答了一份问卷并接受了口腔检查。根据 SHS 持续时间，将家庭 SHS 暴露程度分为四个水平：无接触（-）、过去、当前 SHS<10 年和当前 SHS≥10 年。龋齿表示为患龋、失牙和补牙的总数（DMFT）得分。通过逻辑回归分析确定 SHS 与龋齿之间的关系。当前 SHS≥10 年（中位数：1.0（0.0，3.0））的 DMFT 评分（中位数（25 百分位，75 百分位））明显高于 SHS-（中位数：0.0（0.0，2.0））；=0.001）。DMFT≥1 与 SHS≥10 年显著相关（调整后的优势比：1.50，95%置信区间：1.20-1.87，<0.001）。长期暴露于 SHS（≥10 年）与日本年轻成年人恒牙龋齿有关。
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