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Giovanni A, Giorgia A. The neurophysiological basis of bruxism. Heliyon 2021; 7:e07477. [PMID: 34286138 PMCID: PMC8273205 DOI: 10.1016/j.heliyon.2021.e07477] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 03/05/2021] [Accepted: 06/30/2021] [Indexed: 11/17/2022] Open
Abstract
Mesencephalic trigeminal nucleus (MTN) neurons innervate the stretch receptors of the jaw elevator muscles and periodontal ligament mechanoreceptors, Bruxism activates the MTN. We analyzed how MTN cells are structured, their anatomy and physiology, and the effects of their activation. To induce and maintain sleep, gamma-aminobutyric acid (GABA), an inhibitor neurotransmitter, is released from the ventro-lateral preoptic area of the hypothalamus and acts on the ascending reticular activating system (ARAS) nuclei. The GABA neurotrasmitter induces the entry of chlorine into cells, hyperpolarizing and inhibiting these. MTN cells, on the contrary, are depolarized by GABA, as their receptors are activated upon GABA binding. They “let out” chlorine and activate ARAS cells. MTN cells release glutamate, an excitatory neurotransmitter onto their target cells, in this case onto ARAS cells. During wakefulness, ARAS activation causes cerebral cortex activation; instead, during sleep (sleep bruxism), ARAS activation avoids an excessive reduction in ARAS neurotransmitters, including noradrenaline, dopamine, serotonin, acetylcholine and glutamate. These neurotransmitters, in addition to activating the cerebral cortex, modulate vital functions such as cardiac and respiratory functions. Polysomnography shows that sleep bruxism is always accompanied by cardiac and respiratory activation and, most importantly, by brain function activation. Bruxism is not a parafunction, and it functions to activate ARAS nuclei.
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Affiliation(s)
- Andrisani Giovanni
- Matera, via della Croce 47, Italy.,Ezelsveldlaan 2, 2611 rv, Delft, the Netherlands
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Chen C, Zhu J, Deng X, Yang Z, Lin W, Ma Y, Huang S, Chen L, Liu Y, Zhu F. Severe periodontitis is associated with the serum levels of hypersensitive C reactive protein and lipoprotein-associated phospholipase A2 in the patients of acute ischemic stroke. J Clin Neurosci 2021; 88:232-236. [PMID: 33992190 DOI: 10.1016/j.jocn.2021.04.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 03/23/2021] [Accepted: 04/04/2021] [Indexed: 02/05/2023]
Abstract
BACKGROUND Periodontitis is associated with the pathogenesis of atherosclerotic plaque, and hypersensitive C reactive protein (hs-CRP) and lipoprotein-associated phospholipase A2 (Lp-PLA2) are the serum biomarkers of the stability of atherosclerotic plaque. Whether periodontitis is associated with the serum level of hs-CRP and Lp-PLA2 of acute ischemic stroke remains unclear. MATERIAL AND METHODS We recruited 103 cases with acute ischemic stroke within 7 days after stroke onset. Pocket depth and clinical attachment loss were assessed by oral examination to define the severe periodontitis. Demographic information including gender, age and body weight index, income level, education level, past medical history include smoking history, drinking history, ischemic stroke history, coronary heart disease, hypertension, diabetes and hyperlipidemia were collected, and serum biomarkers including white blood cell (WBC), fibrinogen, total cholesterol (TC), triglyceride (TG), lower density lipoprotein (LDL-C), high density lipoprotein (HDL-C), hs-CRP, HemoglobinA1c (HbAlc), Homocysteine (HCY) and Lp-PLA2 were tested. RESULTS 65 (63.1%) cases were diagnosed as severe periodontitis. Severe periodontitis group showed more male, age, drinking history, higher levels of hs-CRP and Lp-PLA2. Multivariate logistic regression showed that severe periodontitis was were significantly associated with hs-CRP (OR = 2.367, 95%CI: 1.182-4.738; P = .015) and Lp-PLA2 (OR = 2.577, 95% CI: 1.010-6.574; P = .048). CONCLUSIONS Severe periodontitis is independently associated with the serum Level of hs-CRP and Lp-PLA2 in patients with acute ischemic stroke. Whether the improvement of periodontitis could decrease the occurrence and re-occurrence of ischemic stroke by stablizating atherosclerotic plaque need be further studied in future.
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Affiliation(s)
- Chunchun Chen
- Cognitive Impairment Ward of Neurology Department, The Third Affiliated Hospital of Shenzhen University Medical College, Shenzhen City, Guangdong Province 518001, PR China; Department of Neurology, The Affiliated Yuebei People's Hospital of Shantou University Medical College, Shaoguan, Guangdong Province 512025, PR China
| | - Jinhua Zhu
- Department of Neurology, The Affiliated Yuebei People's Hospital of Shantou University Medical College, Shaoguan, Guangdong Province 512025, PR China
| | - Xuhui Deng
- Department of Neurology, The Affiliated Yuebei People's Hospital of Shantou University Medical College, Shaoguan, Guangdong Province 512025, PR China
| | - Zhi Yang
- Department of Neurology, The Affiliated Yuebei People's Hospital of Shantou University Medical College, Shaoguan, Guangdong Province 512025, PR China
| | - Weifeng Lin
- Department of Psychiatry, The First Affiliated Hospital of Jinan University, Guangzhou City, Guangdong Province 510632, PR China
| | - Ying Ma
- Department of Cardiology, The Third Affiliated Hospital of Shenzhen University Medical College, Shenzhen City, Guangdong Province 518001, PR China
| | - Shuxuan Huang
- Department of Neurology, People 's Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi 530021, PR China
| | - Lue Chen
- Department of Neurology, Shunde Hospital of Southern Medical University, Shunde, Guangdong Province 528300, PR China
| | - Yuan Liu
- Department of Neurology, The Third People's Hospital of Hangzhou, Hangzhou, Zhejiang Province 310009, PR China
| | - Feiqi Zhu
- Cognitive Impairment Ward of Neurology Department, The Third Affiliated Hospital of Shenzhen University Medical College, Shenzhen City, Guangdong Province 518001, PR China; Department of Neurology, The Affiliated Yuebei People's Hospital of Shantou University Medical College, Shaoguan, Guangdong Province 512025, PR China.
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Gerreth P, Gerreth K, Maciejczyk M, Zalewska A, Hojan K. Is an Oral Health Status a Predictor of Functional Improvement in Ischemic Stroke Patients Undergoing Comprehensive Rehabilitation Treatment? Brain Sci 2021; 11:brainsci11030338. [PMID: 33799980 PMCID: PMC8002018 DOI: 10.3390/brainsci11030338] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Revised: 03/02/2021] [Accepted: 03/04/2021] [Indexed: 01/07/2023] Open
Abstract
The study's aim was a clinical observation concerning the influence of oral health on functional status in stroke patients undergoing neurorehabilitation. This pilot cross-sectional clinical study was performed in 60 subacute phase stroke patients during 12 weeks of treatment. The program was patient-specific and consisted of neurodevelopmental treatment by a comprehensive rehabilitation team. The functional assessment was performed using the Barthel index (BI), Berg balance scale (BBS), functional independence measure (FIM), and Addenbrooke's cognitive examination III (ACE III) scales. Oral health was assessed according to World Health Organization (WHO) criteria, and it was presented using DMFT, DMFS, gingival index (GI), and plaque index (PlI). Significant improvement in many functional scales was noticed. However, important differences in most dental parameters without relevant changes in GI and PlI after the study were not observed. Reverse interdependence (p < 0.05) was shown between physical functioning (BI, FIM, or BBS) with GI and PlI results, and most dental parameters correlated with ACE III. Using multivariate regression analysis, we showed that ACE III and BI are predictive variables for DMFT, just as FIM is for DS (p < 0.05). The present research revealed that poor oral health status in patients after stroke might be associated with inpatient rehabilitation results.
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Affiliation(s)
- Piotr Gerreth
- Private Dental Practice, 57 Kasztelanska Street, 60-316 Poznan, Poland;
- Postgraduate Studies in Scientific Research Methodology, Poznan University of Medical Sciences, 10 Fredry Street, 60-701 Poznan, Poland
| | - Karolina Gerreth
- Department of Risk Group Dentistry, Chair of Pediatric Dentistry, Poznan University of Medical Sciences, 70 Bukowska Street, 60-812 Poznan, Poland;
| | - Mateusz Maciejczyk
- Department of Hygiene, Epidemiology and Ergonomics, Medical University of Bialystok, 2C Adama Mic kiewicza Street, 15-022 Bialystok, Poland;
| | - Anna Zalewska
- Experimental Dentistry Laboratory, Medical University of Bialystok, 24A Marii Sklodowskiej-Curie Street, 15-276 Bialystok, Poland;
| | - Katarzyna Hojan
- Department of Occupational Therapy, Poznan University of Medical Sciences, 6 Swiecickiego Street, 60-781 Poznan, Poland
- Department of Rehabilitation, Greater Poland Cancer Centre, 15 Garbary Street, 61-866 Poznan, Poland
- Correspondence:
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Kim DH, Jeong SN, Lee JH. Severe periodontitis with tooth loss as a modifiable risk factor for the development of Alzheimer, vascular, and mixed dementia: National Health Insurance Service-National Health Screening Retrospective Cohort 2002-2015. J Periodontal Implant Sci 2020; 50:303-312. [PMID: 33124208 PMCID: PMC7606895 DOI: 10.5051/jpis.2000600030] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 04/14/2020] [Accepted: 05/08/2020] [Indexed: 01/15/2023] Open
Abstract
Purpose The purpose of this study was to evaluate severe periodontitis with tooth loss as a modifiable risk factor for Alzheimer dementia (AD), vascular dementia (VaD), and mixed dementia (MD) using the National Health Insurance Service-National Health Screening Retrospective Cohort database with long-term follow-up over 14 years. Methods Multivariate Cox hazards regression analysis was applied to a longitudinal retrospective database, which was updated in 2018, to evaluate the association between severe periodontitis with few remaining teeth and dementia after adjusting for potential risk factors, including sociodemographic factors and comorbid diseases. Results Among 514,866 individuals in South Korea, 237,940 (46.2%) participants satisfying the inclusion criteria were selected. A total of 10,115 age- and sex-matched participants with severe periodontitis and 10,115 periodontally healthy participants were randomly selected and evenly assigned. The results showed that the risks of AD (hazard ratio [HR], 1.08), VaD (HR, 1.24), and MD (HR, 1.16) were significantly higher in patients with severe periodontitis with 1–9 remaining teeth after adjustment for sociodemographic factors, anthropomorphic measurements, lifestyle factors, and comorbidities. Conclusions Severe periodontitis with few remaining teeth (1–9) may be considered a modifiable risk factor for the development of AD, VaD, and MD in Korean adults.
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Affiliation(s)
- Do Hyung Kim
- Department of Periodontology, Daejeon Dental Hospital, Institute of Wonkwang Dental Research, Wonkwang University College of Dentistry, Daejeon, Korea
| | - Seong Nyum Jeong
- Department of Periodontology, Daejeon Dental Hospital, Institute of Wonkwang Dental Research, Wonkwang University College of Dentistry, Daejeon, Korea
| | - Jae Hong Lee
- Department of Periodontology, Daejeon Dental Hospital, Institute of Wonkwang Dental Research, Wonkwang University College of Dentistry, Daejeon, Korea.
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Alvarenga MOP, Ferreira RDO, Magno MB, Fagundes NCF, Maia LC, Lima RR. Masticatory Dysfunction by Extensive Tooth Loss as a Risk Factor for Cognitive Deficit: A Systematic Review and Meta-Analysis. Front Physiol 2019; 10:832. [PMID: 31333490 PMCID: PMC6618904 DOI: 10.3389/fphys.2019.00832] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2019] [Accepted: 06/17/2019] [Indexed: 01/20/2023] Open
Abstract
Background: An amount of cognition decline is normal with aging; however, intrinsic and extrinsic risk factors may exacerbate it, affecting social and occupational tasks. Masticatory dysfunction (MD), as a general term, refers to an impairment in the masticatory function triggered by a structural factor, such as tooth loss; functional factors, such as weaker bite force or a poorer masticatory performance; or both factors. MD acting as a source of chronic stress, promotes functional and morphological changes on the hippocampus, a brain area crucial for learning and memory abilities. This study aimed to synthesize evidence on the association between MD and cognitive deficit (CD), and demonstrate whether might be adequately considered as a risk factor. Methods: Observational studies were screened in seven online databases; the search strategy (PECO) was focused in observational studies with humans as a population (P), presenting groups exposed (E), and non-exposed (C) to tooth loss, in which cognition parameters were measured and compared between groups (O). The final selection included only those studies comparing the effect in cognition between subjects having ≥20 remaining teeth and <20 remaining teeth, considering the latter as a structural factor triggering MD by the literature. Searching and data extraction were conducted following PRISMA guidelines. Qualitative and risk of bias evaluations were performed. The meta-analysis (MA) was constructed including the odds ratio (OR) and its 95% confidence interval (CI) comparing two groups—with/without MD. The level of evidence was rated by Grading Recommendations Assessment, Development and Evaluation (GRADE) approach. Results: In total, 5,666 citations were identified, 14 accomplished our eligibility criteria, and nine were include in the MA. The MA demonstrates that individuals with MD had 46% higher chance to presented CD (OR 2.24 [1.73, 2.90], p < 0.00001, I2 = 46%). The level of evidence was rated as low by GRADE. Conclusion: Despite the low certainty in evidence, according to our MA, MD is positively associated with increased risk of CD. However, more studies including other factors underlying MD and similar measurements should be conducted to obtain a strong estimate of the risk.
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Affiliation(s)
- María Olimpia Paz Alvarenga
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
| | - Railson de Oliveira Ferreira
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
| | - Marcela Baraúna Magno
- Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Lucianne Cople Maia
- Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Rafael Rodrigues Lima
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
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Kato H, Takahashi Y, Iseki C, Igari R, Sato H, Sato H, Koyama S, Tobita M, Kawanami T, Iino M, Ishizawa K, Kato T. Tooth Loss-associated Cognitive Impairment in the Elderly: A Community-based Study in Japan. Intern Med 2019; 58:1411-1416. [PMID: 30626824 PMCID: PMC6548929 DOI: 10.2169/internalmedicine.1896-18] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Objective Dementia is a major cause of disruption for a healthy life expectancy in Japan. It has been suggested that the number of teeth is a modifiable risk factor for cognitive impairment and dementia. We therefore examined the possible association between the cognitive function and the number of natural and artificial teeth in community-dwelling Japanese elderly individuals. Methods Among the participants in our prospective, community-based study, 210 elderly individuals (103 men and 107 women; 78.1±4.9 years; mean age±standard deviation) underwent both dental examinations and a Mini-Mental State Examination (MMSE), as well as various medical checkups, in 2016 and 2017. Results The number of natural teeth was significantly associated with an individual's MMSE score. The percentage of cognitively normal subjects (MMSE scores: 27-30) decreased significantly with a decrease in the number of natural teeth. Among the MMSE items, the calculation ability was significantly and independently associated with the number of natural teeth. Regression was calculated as the predicted score of MMSE =21+0.3× (years of schooling) +0.1× (number of natural teeth). Among individuals with 19 or fewer natural teeth, those who had a total of 20 teeth or more, including both natural and artificial teeth, had significantly higher MMSE scores than those who had 19 or fewer natural and artificial teeth combined. Conclusion The number of natural teeth was significantly associated with the cognitive function, especially the calculation ability, and the use of artificial teeth was associated with the preservation of the cognitive function in community-dwelling elderly individuals.
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Affiliation(s)
- Hajime Kato
- Division of Neurology and Clinical Neuroscience, Department of Internal Medicine III, Yamagata University Faculty of Medicine, Japan
- Department of Dentistry, Oral and Maxillofacial-Plastic and Reconstructive Surgery, Yamagata University Faculty of Medicine, Japan
- National Hospital Organization Yonezawa Hospital, Japan
| | - Yoshimi Takahashi
- Division of Neurology and Clinical Neuroscience, Department of Internal Medicine III, Yamagata University Faculty of Medicine, Japan
| | - Chifumi Iseki
- Division of Neurology and Clinical Neuroscience, Department of Internal Medicine III, Yamagata University Faculty of Medicine, Japan
| | - Ryosuke Igari
- Division of Neurology and Clinical Neuroscience, Department of Internal Medicine III, Yamagata University Faculty of Medicine, Japan
| | - Hidenori Sato
- Division of Neurology and Clinical Neuroscience, Department of Internal Medicine III, Yamagata University Faculty of Medicine, Japan
| | - Hiroyasu Sato
- Division of Neurology and Clinical Neuroscience, Department of Internal Medicine III, Yamagata University Faculty of Medicine, Japan
| | - Shingo Koyama
- Division of Neurology and Clinical Neuroscience, Department of Internal Medicine III, Yamagata University Faculty of Medicine, Japan
| | | | - Toru Kawanami
- National Hospital Organization Yamagata Hospital, Japan
| | - Mitsuyoshi Iino
- Department of Dentistry, Oral and Maxillofacial-Plastic and Reconstructive Surgery, Yamagata University Faculty of Medicine, Japan
| | - Kenichi Ishizawa
- Division of Neurology and Clinical Neuroscience, Department of Internal Medicine III, Yamagata University Faculty of Medicine, Japan
| | - Takeo Kato
- Division of Neurology and Clinical Neuroscience, Department of Internal Medicine III, Yamagata University Faculty of Medicine, Japan
- Yamagata City Office, Japan
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Aging, Mastication, and Malnutrition and Their Associations with Cognitive Disorder: Evidence from Epidemiological Data. ACTA ACUST UNITED AC 2019. [DOI: 10.1007/s40496-019-0220-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Aarabi G, Thomalla G, Heydecke G, Seedorf U. Chronic oral infection: An emerging risk factor of cerebral small vessel disease. Oral Dis 2018; 25:710-719. [DOI: 10.1111/odi.12912] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Revised: 05/31/2018] [Accepted: 06/04/2018] [Indexed: 12/26/2022]
Affiliation(s)
- Ghazal Aarabi
- Department of Prosthetic DentistryCenter for Dental and Oral MedicineUniversity Medical Center Hamburg‐Eppendorf Hamburg Germany
| | - Götz Thomalla
- Department of NeurologyHead‐ and NeurocenterUniversity Medical Center Hamburg‐Eppendorf Hamburg Germany
| | - Guido Heydecke
- Department of Prosthetic DentistryCenter for Dental and Oral MedicineUniversity Medical Center Hamburg‐Eppendorf Hamburg Germany
| | - Udo Seedorf
- Department of Prosthetic DentistryCenter for Dental and Oral MedicineUniversity Medical Center Hamburg‐Eppendorf Hamburg Germany
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Saito S, Ohi T, Murakami T, Komiyama T, Miyoshi Y, Endo K, Satoh M, Asayama K, Inoue R, Kikuya M, Metoki H, Imai Y, Ohkubo T, Hattori Y. Association between tooth loss and cognitive impairment in community-dwelling older Japanese adults: a 4-year prospective cohort study from the Ohasama study. BMC Oral Health 2018; 18:142. [PMID: 30126407 PMCID: PMC6102919 DOI: 10.1186/s12903-018-0602-7] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Accepted: 08/03/2018] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Numerous prospective studies have investigated the association between the number of remaining teeth and dementia or cognitive decline. However, no agreement has emerged on the association between tooth loss and cognitive impairment, possibly due to past studies differing in target groups and methodologies. We aimed to investigate the association between tooth loss, as evaluated through clinical oral examinations, and the development of cognitive impairment in community-dwelling older adults while considering baseline cognitive function. METHODS This 4-year prospective cohort study followed 140 older adults (69.3% female) without cognitive impairment aged ≥65 years (mean age: 70.9 ± 4.3 years) living in the town of Ohasama, Iwate Prefecture, Japan. Cognitive function was evaluated with the Mini-Mental State Examination (MMSE) in baseline and follow-up surveys. Based on a baseline oral examination, the participants were divided into those with 0-9 teeth and those with ≥10 teeth. To investigate the association between tooth loss and cognitive impairment, we applied a multiple logistic regression analysis adjusted for age, sex, hypertension, diabetes, cerebrovascular/cardiovascular disease, hypercholesterolemia, depressive symptoms, body mass index, smoking status, drinking status, duration of education, and baseline MMSE score. RESULTS In the 4 years after the baseline survey, 27 participants (19.3%) developed cognitive impairment (i.e., MMSE scores of ≤24). Multiple logistic regression analysis indicated that participants with 0-9 teeth were more likely to develop cognitive impairment than those with ≥10 teeth were (odds ratio: 3.31; 95% confidence interval: 1.07-10.2). Age, male gender, and baseline MMSE scores were also significantly associated with cognitive impairment. CONCLUSIONS Tooth loss was independently associated with the development of cognitive impairment within 4 years among community-dwelling older adults. This finding corroborates the hypothesis that tooth loss may be a predictor or risk factor for cognitive decline.
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Affiliation(s)
- Sho Saito
- Division of Aging and Geriatric Dentistry, Department of Oral Function and Morphology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575 Japan
| | - Takashi Ohi
- Division of Aging and Geriatric Dentistry, Department of Oral Function and Morphology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575 Japan
- Japanese Red Cross Ishinomaki Hospital, Ishinomaki, Japan
| | - Takahisa Murakami
- Division of Public Health, Hygiene and Epidemiology, Faculty of Medicine, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - Takamasa Komiyama
- Division of Aging and Geriatric Dentistry, Department of Oral Function and Morphology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575 Japan
| | - Yoshitada Miyoshi
- Division of Aging and Geriatric Dentistry, Department of Oral Function and Morphology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575 Japan
| | - Kosei Endo
- Division of Aging and Geriatric Dentistry, Department of Oral Function and Morphology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575 Japan
| | - Michihiro Satoh
- Division of Public Health, Hygiene and Epidemiology, Faculty of Medicine, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - Kei Asayama
- Department of Hygiene and Public Health, Teikyo University School of Medicine, Tokyo, Japan
- Department of Planning for Drug Development and Clinical Evaluation, Tohoku University Graduate School of Pharmaceutical Sciences, Sendai, Japan
| | - Ryusuke Inoue
- Department of Medical Informatics, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Masahiro Kikuya
- Department of Preventive Medicine and Epidemiology, Tohoku Medical Megabank Organization, Tohoku University, Sendai, Japan
| | - Hirohito Metoki
- Division of Public Health, Hygiene and Epidemiology, Faculty of Medicine, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - Yutaka Imai
- Department of Planning for Drug Development and Clinical Evaluation, Tohoku University Graduate School of Pharmaceutical Sciences, Sendai, Japan
| | - Takayoshi Ohkubo
- Department of Hygiene and Public Health, Teikyo University School of Medicine, Tokyo, Japan
| | - Yoshinori Hattori
- Division of Aging and Geriatric Dentistry, Department of Oral Function and Morphology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575 Japan
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Zhang C, She Y, Lan T, Hu B, Zhang G, He J, Wang Z, Jiang M, Hu R. Study on epidemiology of cognitive dysfunction after stroke in the population over the age of 45 in Inner Mongolia. Int J Neurosci 2018; 128:654-662. [PMID: 29172850 DOI: 10.1080/00207454.2017.1408615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
OBJECTIVE To analyze the prevalence of different degrees vascular cognitive impairment (VCI) in stroke and the characteristics of demography distribution in Inner Mongolia. In order to provide reference data and theoretical guidance for the prevention and treatment of VCI after stroke in the area. METHODS Stratified multi-stage random sampling was used to extract six regions of Inner Mongolia as the first sampling cluster; and then the corresponding banners (counties) were selected randomly as the secondary sampling cluster; according to the number of patient required to investigation, the corresponding number of communities was randomly selected from the secondary sampling cluster. According to the diagnostic criteria of 'Guidelines for the diagnosis and treatment of vascular cognitive impairment' and National Institute of Neurological Disorders and Stroke convened an International Workshop with support from the Association Internationale pour la Recherche et l'Enseignement en Neurosciences (NINDS-AIREN), we screened all stroke patients aged 45 or older from each community, a total of 444 patients participated in the questionnaire and various scale assessments. RESULTS The prevalence of VCI, vascular cognitive impairment no dementia and vascular dementia was 80.41%, 34.46% and 45.95% respectively. The prevalence of VCI in stroke was significantly different in different nationality, age and education level (P < 0.05), and there was no significant difference in gender, occupation, marital status and family structure (P > 0.05). CONCLUSION The prevalence of VCI after stroke was higher in Inner Mongolia, and VCI had a relatively high morbidity in old age people and person with less education in Chinese Han population.
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Affiliation(s)
- Chunyu Zhang
- a Department of Neurology , The Affiliated Hospital of Inner Mongolia Medical University , Hohhot , China
| | - Yan She
- a Department of Neurology , The Affiliated Hospital of Inner Mongolia Medical University , Hohhot , China
| | - Tian Lan
- a Department of Neurology , The Affiliated Hospital of Inner Mongolia Medical University , Hohhot , China
| | - Baolige Hu
- a Department of Neurology , The Affiliated Hospital of Inner Mongolia Medical University , Hohhot , China
| | - Guohua Zhang
- a Department of Neurology , The Affiliated Hospital of Inner Mongolia Medical University , Hohhot , China
| | - Juan He
- a Department of Neurology , The Affiliated Hospital of Inner Mongolia Medical University , Hohhot , China
| | - Zhiguang Wang
- a Department of Neurology , The Affiliated Hospital of Inner Mongolia Medical University , Hohhot , China
| | - Mingfang Jiang
- a Department of Neurology , The Affiliated Hospital of Inner Mongolia Medical University , Hohhot , China
| | - Riletemuer Hu
- a Department of Neurology , The Affiliated Hospital of Inner Mongolia Medical University , Hohhot , China
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Ishimiya M, Nakamura H, Kobayashi Y, Noguchi-Shinohara M, Abe C, Dohmoto C, Ikeda Y, Tokuno K, Ooi K, Yokokawa M, Iwasa K, Komai K, Kawashiri S, Yamada M. Tooth loss-related dietary patterns and cognitive impairment in an elderly Japanese population: The Nakajima study. PLoS One 2018; 13:e0194504. [PMID: 29543872 PMCID: PMC5854423 DOI: 10.1371/journal.pone.0194504] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Accepted: 03/05/2018] [Indexed: 12/22/2022] Open
Abstract
Although several studies have demonstrated a potential correlation of dietary patterns with cognitive function, the relationship between tooth loss and dietary patterns and cognitive function have not been identified. In this cross-sectional study, we used a reduced rank regression (RRR) analysis, a technique used previously to observe dietary patterns based on the intakes of nutrients or levels of biomarkers associated with the condition of interest, to identify tooth loss-related dietary patterns and investigate the associations of such patterns with cognitive impairment in 334 community-dwelling Japanese subjects aged ≥ 60 years. According to Pearson correlation coefficients, the intakes of six nutrients (ash content, sodium, zinc, vitamin B1, α- and β-carotene) correlated significantly with the number of remaining teeth. Using RRR analysis, we extracted four dietary patterns in our subject population that explained 86.67% of the total variation in the intakes of these six nutrients. Particularly, dietary pattern 1 (DP1) accounted for 52.2% of the total variation. Food groups with factor loadings of ≥ 0.2 included pickled green leafy vegetables, lettuce/cabbage, green leaves vegetables, cabbage, carrots/squash; by contrast, rice had a factor loading of <−0.2. In a multivariate regression analysis, the adjusted odds ratios regarding the prevalence of cognitive impairment for the lowest, middle and highest tertiles of the DP1 score were 1.00 (reference), 1.224 (95% confidence interval [CI]: 0.611–2.453) and 0.427 (95% CI: 0.191–0.954), respectively. To our knowledge, this is the first report to show that tooth loss-related dietary patterns are associated with a high prevalence of cognitive impairment. These results may motivate changes in dental treatment and the dietary behaviours and thereby lower the risk of cognitive impairment.
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Affiliation(s)
- Mai Ishimiya
- Department of Oral and Maxillofacial Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
| | - Hiroyuki Nakamura
- Department of Oral and Maxillofacial Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
| | - Yutaka Kobayashi
- Department of Oral and Maxillofacial Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
| | - Moeko Noguchi-Shinohara
- Department of Neurology and Neurobiology of Aging, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
| | - Chiemi Abe
- Department of Neurology and Neurobiology of Aging, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
| | - Chiaki Dohmoto
- Department of Neurology and Neurobiology of Aging, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
| | - Yoshihisa Ikeda
- Department of Neurology and Neurobiology of Aging, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
| | - Kahori Tokuno
- Department of Oral and Maxillofacial Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
| | - Kazuhiro Ooi
- Department of Oral and Maxillofacial Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
| | - Masami Yokokawa
- Department of Physical Therapy, Division of Health Science, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
| | - Kazuo Iwasa
- Department of Neurology and Neurobiology of Aging, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
| | - Kiyonobu Komai
- Department of Neurology, Ioh Hospital, National Hospital Organization, Kanazawa, Japan
| | - Shuichi Kawashiri
- Department of Oral and Maxillofacial Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
| | - Masahito Yamada
- Department of Neurology and Neurobiology of Aging, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
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12
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Test repositioning for functional assessment of neurological outcome after experimental stroke in mice. PLoS One 2017; 12:e0176770. [PMID: 28472090 PMCID: PMC5417557 DOI: 10.1371/journal.pone.0176770] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 04/17/2017] [Indexed: 12/28/2022] Open
Abstract
Stroke is a cerebrovascular pathology for which the only approved treatment is fibrinolysis. Several studies have focused on the development of new drugs but none has led to effective therapies to date, due, among others, to the difficulty to evaluate clinical deficits in experimental animal models. The present study aims to explore the applicability of known behavioral tests not commonly used in ischemia for the neurological assessment of mice after experimental stroke in different brain areas. A total of 225 CD1 male mice were randomly assigned to permanent middle cerebral artery occlusion by ligature (pMCAO) or permanent anterior cerebral artery occlusion by photothrombosis (pACAO) models. Modified neuroseverity score, footprint test, forced swim test and elevated plus maze were performed. Under these experimental conditions, modified neuroseverity score showed neurological impairment early after experimental stroke in both models. By contrast, the footprint test and the elevated plus maze detected short-term neurological deterioration in the pMCAO model but not in the pACAO model. Furthermore, the forced swim test identified depression-like behavior in mice after ischemia only when the left hemisphere was affected. In conclusion, we propose the repositioning of known neurobehavioral tests, but not commonly used in the stroke field, for the fast detection of neurological impairments early after ischemia, and even specific to discriminate the territory affected by arterial occlusion as well as the hemisphere where brain damage occurs. All these findings may prove useful to improve the experimental design of neuroprotective drugs in order to bridge the gap between experimental studies and clinical trials.
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13
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Takeuchi K, Ohara T, Furuta M, Takeshita T, Shibata Y, Hata J, Yoshida D, Yamashita Y, Ninomiya T. Tooth Loss and Risk of Dementia in the Community: the Hisayama Study. J Am Geriatr Soc 2017; 65:e95-e100. [PMID: 28272750 DOI: 10.1111/jgs.14791] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
OBJECTIVES To clarify the effect of tooth loss on development of all-cause dementia and its subtypes in an elderly Japanese population. DESIGN Prospective cohort study. SETTING The Hisayama Study, Japan. PARTICIPANTS Community-dwelling Japanese adults without dementia aged 60 and older (N = 1,566) were followed for 5 years (2007-2012). MEASUREMENTS Participants were classified into four categories according to baseline number of remaining teeth (≥20, 10-19, 1-9, 0). The risk estimates of the effect of tooth loss on the development of all-cause dementia, Alzheimer's disease (AD), and vascular dementia (VaD) were computed using a Cox proportional hazards model. RESULTS During follow-up, 180 (11.5%) subjects developed all-cause dementia; 127 (8.1%) had AD, and 42 (2.7%) had VaD. After adjusting for potential confounders, there was a tendency for the multivariable-adjusted hazard ratio of all-cause dementia to increase with decrease in number of remaining teeth (P for trend = .04). The risk of all-cause dementia was 1.62 times as great in subjects with 10 to 19 teeth, 1.81 times as great in those with one to nine teeth, and 1.63 times as great in those with no teeth as in those with 20 teeth or more. An inverse association was observed between number of remaining teeth and risk of AD (P for trend = .08), but no such association was observed with risk of VaD (P for trend = .20). CONCLUSION Tooth loss is associated with an increased risk of all-cause dementia and AD in the Japanese population.
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Affiliation(s)
- Kenji Takeuchi
- Section of Preventive and Public Health Dentistry, Division of Oral Health, Growth and Development, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Tomoyuki Ohara
- Department of Neuropsychiatry, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.,Department of Epidemiology and Public Health, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Michiko Furuta
- Section of Preventive and Public Health Dentistry, Division of Oral Health, Growth and Development, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Toru Takeshita
- Section of Preventive and Public Health Dentistry, Division of Oral Health, Growth and Development, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Yukie Shibata
- Section of Preventive and Public Health Dentistry, Division of Oral Health, Growth and Development, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Jun Hata
- Department of Epidemiology and Public Health, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.,Center for Cohort Studies, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.,Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Daigo Yoshida
- Department of Epidemiology and Public Health, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.,Center for Cohort Studies, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Yoshihisa Yamashita
- Section of Preventive and Public Health Dentistry, Division of Oral Health, Growth and Development, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Toshiharu Ninomiya
- Department of Epidemiology and Public Health, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.,Center for Cohort Studies, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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14
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Wang Y, Peng J, Li Y, Luo H, Huang G, Luo S, Yin X, Song J. Association between tooth loss and risk of oesophageal cancer: a dose-response meta-analysis. SPRINGERPLUS 2016; 5:1020. [PMID: 27441139 PMCID: PMC4938834 DOI: 10.1186/s40064-016-2711-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Accepted: 06/29/2016] [Indexed: 12/31/2022]
Abstract
Many epidemiological studies have found that tooth loss is associated with susceptibility to oesophageal cancer. However, a definitive answer is yet to be discovered, and the findings are inconclusive. We performed a meta-analysis to assess the relationship between tooth loss and oesophageal cancer risk. We searched PubMed and Embase databases to screen eligible studies up to June 2015. Nine observational studies (eight articles) involving 2604 patients and 113,995 participants were included in the meta-analysis. The combined odds ratio for tooth loss and oesophageal cancer was 1.53 (95 % CI 1.02-2.29) for the high versus lowest teeth loss categories. However, inconsistent results were detected in the stratified and sensitivity analysis. In dose-response analysis, the summary odds ratio for each one tooth loss increment was 1.01 (95 % CI 1.00-1.02). The current evidence, based solely on six case-control studies and three cohort studies, suggests that tooth loss is a potential marker of oesophageal cancer. However, no firm conclusion can be drawn at this time that tooth loss may play a causal role in development of oesophageal cancer. Additional large-scale and high-quality prospective studies are required to evaluate the association between tooth loss and risk of oesophageal cancer.
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Affiliation(s)
- Yadong Wang
- Department of Oral and Maxillofacial Surgery, Guizhou Provincial People's Hospital, Guizhou, 550002 China
| | - Juxiang Peng
- Department of Orthodontics, Stomatology Hospital of Guiyang, Guizhou, 550002 China
| | - Yan Li
- Department of Oral and Maxillofacial Surgery, Guizhou Provincial People's Hospital, Guizhou, 550002 China
| | - Hong Luo
- Department of Oral and Maxillofacial Surgery, Guizhou Provincial People's Hospital, Guizhou, 550002 China
| | - Guanglei Huang
- Department of Oral and Maxillofacial Surgery, Guizhou Provincial People's Hospital, Guizhou, 550002 China
| | - Siyang Luo
- Department of Oral and Maxillofacial Surgery, Guizhou Provincial People's Hospital, Guizhou, 550002 China
| | - Xinhai Yin
- Department of Oral and Maxillofacial Surgery, Guizhou Provincial People's Hospital, Guizhou, 550002 China
| | - Jukun Song
- Department of Oral and Maxillofacial Surgery, Guizhou Provincial People's Hospital, Guizhou, 550002 China
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15
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Xu X, Cao B, Wang J, Yu T, Li Y. Decision-making deficits associated with disrupted synchronization between basolateral amygdala and anterior cingulate cortex in rats after tooth loss. Prog Neuropsychopharmacol Biol Psychiatry 2015; 60:26-35. [PMID: 25684327 DOI: 10.1016/j.pnpbp.2015.02.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Accepted: 02/05/2015] [Indexed: 12/09/2022]
Abstract
Human studies have shown that multiple teeth loss was significantly associated with cognitive impairment, dementia and Alzheimer's disease. However, the causal relationship between tooth loss and cognitive deficits has not been clarified. Rodents demonstrate human-like cognitive faculties. In this study by performing rat gambling task (RGT), we reported that prolonged tooth loss condition by extracting all left molars in the rats led to an increase in the proportion of poor decision-makers, and decrease in the proportion of good decision-makers compared with controls. No influence was detected on the general activity and motivation after tooth loss. Recent experiments have shown that decision-making performances in the RGT rely on the functional integrity of the amygdala and anterior cingulate cortex (ACC). The theta band brain oscillation has been acknowledged for extensive cognitive functions. Here, we performed multiple-electrode array recordings of local field potential (LFP) in anesthetized rats. The results exhibited an increase in accumulative power of the theta frequency of LFP in the basolateral amygdala (BLA) and decrease of theta power in the ACC in tooth loss rats. Furthermore, cross-correlation analysis displayed that tooth loss suppressed the synchronization of theta frequency of LFP between the BLA and ACC, indicating reduced neuronal communications between these two regions. In conclusion, we demonstrate for the first time that tooth loss leads to higher-order cognitive deficits accompanied by the alteration of theta frequency of LFP in brain circuitries and disruption of neural network integrity.
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Affiliation(s)
- Xiaoxiang Xu
- Department of Biomedical Science, City University of Hong Kong, Hong Kong, China; Centre for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Hong Kong, China
| | - Bing Cao
- Department of Biomedical Science, City University of Hong Kong, Hong Kong, China; Centre for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Hong Kong, China
| | - Jun Wang
- Department of Biomedical Science, City University of Hong Kong, Hong Kong, China; Centre for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Hong Kong, China
| | - Tianran Yu
- Department of Biomedical Science, City University of Hong Kong, Hong Kong, China; Centre for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Hong Kong, China
| | - Ying Li
- Department of Biomedical Science, City University of Hong Kong, Hong Kong, China; Centre for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Hong Kong, China.
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