Relationship between cognitive function and mastication in elderly females.

Area of Science:

• Gerontology
• Neuroscience
• Oral Health

Background:

• Dementia is a growing concern in Japan's aging population.
• Animal studies suggest a link between reduced chewing ability and cognitive decline.
• Epidemiological evidence on this relationship in humans is limited.

Purpose of the Study:

• To investigate the association between masticatory function and cognitive status in elderly Japanese females.
• To compare oral health indicators in elderly women with and without dementia.

Main Methods:

• An epidemiological study involving 88 elderly Japanese females (44 with dementia, 44 without).
• Participants were matched for age and basic activities of daily living.
• Cognitive function was assessed using the revised Hasegawa Dementia Rating Scale.
• Masticatory function was evaluated by the number of teeth, maximum bite force, occlusal contact area, and mastication score.

Main Results:

• Elderly individuals with normal cognitive function had a significantly higher number of teeth compared to those with cognitive impairment (P < 0.05).
• Cognitively normal subjects also exhibited significantly higher maximum bite force, occlusal contact area, and mastication scores (P < 0.01).

Conclusions:

• Masticatory function, encompassing factors like tooth count and bite force, is significantly associated with cognitive status in the elderly.
• These findings highlight the potential importance of oral health maintenance for preserving cognitive function in aging populations.