Association between mastication and cognitive status: A systematic review |
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| Affiliation: | 1. Department of Health Science, Hyogo University, 2301 Shinzaike Hiraoka-cho, Kakogawa, Hyogo 675-0195, Japan;2. Department of International Health and Collaboration, National Institute of Public Health, 2-3-6, Minami, Wako, Saitama 351-0197, Japan;1. Centre for Public Health, Queen’s University Belfast, United Kingdom;2. Department of Prosthodontics, Gerostomatology and Biomaterials, Center for Oral Health, University Medicine Greifswald, Greifswald, Germany;3. Cork University Dental School and Hospital, University College Cork, Ireland;4. Division of Gerodontology, University of Bern, Switzerland;5. Division of Gerodontology and Removable Prosthodontics, University of Geneva, Switzerland;1. Department of Prosthodontics and Oral Implantology, School of Dentistry, Iwate Medical University, Morioka, Japan,;2. Department of Oral Health Science for Community Welfare, Faculty of Dentistry, Tokyo Medical and Dental University, Tokyo, Japan;1. Department of Oral Diseases Research, National Center for Geriatrics and Gerontology, 35, Gengo, Morioka-machi, Obu-City, Aichi 474-8511, Japan;2. Research Team for Promoting Independence of the Elderly, Tokyo Metropolitan Institute of Gerontology, 35-2 Sakaecho, Itabasi-ku, Tokyo 173-0015, Japan;1. Aging Research Center, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet and Stockholm University, Stockholm, Sweden;2. Department of Dental Medicine, Karolinska Institute, Huddinge, Sweden Stockholm, Academic Centre of Geriatric Dentistry, Stockholm, Sweden;3. Department of Epidemiology and Biostatistics, School of Public Health, Tianjin Medical University, China;1. Department of Dental Hygiene, College of Science & Technology, Kyungpook National University, Sangju, Republic of Korea;2. Department of Preventive Medicine, School of Medicine, Kyungpook National University, Daegu, Republic of Korea;3. Department of Preventive Dentistry, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea;4. Department of Preventive Dentistry, Osaka University Graduate School of Dentistry Suita, Japan;5. Faculty of Nursing and Human Nutrition, Yamaguchi Prefectural University, Japan;6. Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea;7. Department of Dentistry, Yeungnam University College of Medicine, Daegu, Republic of Korea |
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| Abstract: | PurposeA substantial number of elderly people suffer from cognitive impairment and dementia, which are considered to have various risk factors, including masticatory dysfunction; however, the association between mastication and cognition is inconclusive. The objectives of this systematic review were to provide an overview of the literature on (1) the association between mastication and cognitive function and (2) the association between mastication and dementia incidence, in elderly people.Materials and methodsSearches were conducted on five electronic databases (PubMed, EMBASE, CINHL, Cochrane Library, and Pro Quest) and publications were selected that met the following criteria: published between 2005 and 2015, written in English, and assessed associations between mastication and cognitive function, cognitive decline and dementia among population over 40 years old. The included publications were analyzed for study design, main conclusions, and strength of evidence by two reviewers who screened all abstracts and full-text articles, abstracted data and performed quality assessments by using a critical appraisal tool.ResultsA total of 33 articles (22 cross-sectional, and 11 prospective cohort studies) were evaluated. Poorer mastication was associated with lower cognitive function in 15 of the 17 cross-sectional studies and steeper decline in 5 of the 6 prospective studies. Poorer mastication was one of significant risk factors for having dementia or mild memory impairment (MMI) in 4 of 5 cross-sectional studies and for the incidence of dementia or MMI in 4 of 5 prospective studies.ConclusionsMost studies point to a positive association between mastication and cognitive function, including dementia among elderly people. |
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| Keywords: | Mastication Cognitive impairment Dementia Elderly people |
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