Fukai Institute of Health Science National Institute of Public Health, Department of Oral Health, Saitama, Japan.
Geriatr Gerontol Int. 2011 Oct;11(4):482-7. doi: 10.1111/j.1447-0594.2011.00722.x. Epub 2011 Jun 27.
To assess the critical tooth number (CTN) required for prevention of subjective dysphagia caused by oral impairments and to evaluate the relationship between this CTN and mortality.
The baseline study was performed with residents aged 40-89years (n=5,643; 2224 men and 3419 women) in Miyako Islands, Okinawa, in 1987. Dental examinations were performed by dentists, and subjective dysphagia was asked. We recorded the cause and year of death of participants who died during the next 15years.
The average functional tooth number of participants with and without subjective dysphagia declined with age in both sexes. The CTN for each respective age group (40s, 50s, 60s, 70s and 80s) not including the denture group were 20.0, 17.5, 14.0, 11.8 and 10.1 in men and 19.0, 14.7, 12.7, 9.5 and 4.0 in women. These CTN were significant factors of 15-year mortality in both sexes (P<0.05). The hazard ratios were 0.72 (95% confidence interval=0.55-0.93) in men and 0.71 (0.51-0.99) in women.
In aged people, the minimum number of functional teeth needed to avoid subjective dysphagia might not be as high as in young people.
评估预防口腔功能障碍引起的主观吞咽困难所需的临界牙数（CTN），并评估该 CTN 与死亡率之间的关系。
本研究为基线研究，研究对象为 1987 年冲绳宫古岛年龄在 40-89 岁的居民（n=5643；2224 名男性和 3419 名女性）。由牙医进行口腔检查，并询问主观吞咽困难情况。记录在接下来 15 年内死亡的参与者的死因和死亡年份。
在男性和女性中，有和没有主观吞咽困难的参与者的平均功能牙数均随年龄增长而下降。不包括义齿组的各年龄段（40 多岁、50 多岁、60 多岁、70 多岁和 80 多岁）的 CTN 分别为男性 20.0、17.5、14.0、11.8 和 10.1，女性为 19.0、14.7、12.7、9.5 和 4.0。这些 CTN 是两性 15 年死亡率的显著因素（P<0.05）。男性的危险比为 0.72（95%置信区间=0.55-0.93），女性为 0.71（0.51-0.99）。
在老年人中，避免主观吞咽困难所需的最小功能牙数可能不像年轻人那么高。
