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Choi YY, Lee KH. Association Between Subjective Masticatory Function and Mild Cognitive Impairment in Older Adults. Int Dent J 2024; 74:492-499. [PMID: 38584039 PMCID: PMC11123537 DOI: 10.1016/j.identj.2024.03.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 03/15/2024] [Accepted: 03/20/2024] [Indexed: 04/09/2024] Open
Abstract
AIM This study aimed to examine the effect of subjective masticatory function on the occurrence of mild cognitive impairment (MCI) by analysing the Korean Longitudinal Study of Ageing (KLoSA) data. METHODS The study participants were 2954 KLoSA participants aged 60 years or older in the first wave (2006) who had normal cognitive function. The subjective masticatory function was determined using a survey item, and the responses were grouped into 3 categories, ie, good, moderate, and poor. The occurrence of MCI in the 3 groups was followed up until 2020. Cognitive function was assessed based on the Korean Mini-Mental State Examination score. Age, sex, education level, residence, health insurance type, smoking status, drinking status, and the number of chronic diseases were considered as potential confounders. To examine the occurrence of MCI according to subjective masticatory function, Cox proportional hazard regression analysis was performed. RESULTS Cox proportional hazard regression models adjusted for confounders yielded the following results: in men, the risk of MCI was higher in those whose subjective masticatory function was moderate and poor, as compared to those with good subjective masticatory function (adjusted hazard ratio [aHR], 1.33; 95% confidence interval [CI], 1.12-1.58; aHR, 1.23; 95% CI, 1.04-1.46). In contrast, in women, subjective masticatory function did not significantly influence the occurrence of MCI (aHR, 1.05; 95% CI, 0.89-1.24; aHR, 1.08; 95% CI, 0.92-1.28). CONCLUSIONS This study suggests that poor masticatory function may be a risk factor for MCI in older men.
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Affiliation(s)
- Yoon Young Choi
- Department of Dental Hygiene, College of Bioecological Health, Shinhan University, Uijeongbu, Republic of Korea
| | - Kyeong Hee Lee
- Department of Dental Hygiene, College of Bioecological Health, Shinhan University, Uijeongbu, Republic of Korea.
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Kariya C, Kanzaki H, Kumazawa M, Sahara S, Yoshida K, Inagawa Y, Kobayashi F, Tomonari H. Skeletal Anterior Open Bite Attenuates the Chewing-Related Increase in Brain Blood Flow. Dent J (Basel) 2024; 12:161. [PMID: 38920862 PMCID: PMC11202511 DOI: 10.3390/dj12060161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 05/17/2024] [Accepted: 05/22/2024] [Indexed: 06/27/2024] Open
Abstract
The masticatory function of patients with skeletal anterior open bite (OPEN) is reported to be impaired compared with that of patients with normal occlusion (NORM). In this study, we compared brain blood flow (BBF) in patients with OPEN and NORM and investigated the factors related to BBF during mastication in patients with OPEN. The study included 17 individuals with NORM and 33 patients with OPEN. The following data were collected: number of occlusal contacts, jaw movement variables during mastication, and BBF measured with functional near-infrared spectroscopy during chewing. The number of occlusal contacts, maximum closing and opening speeds, closing angle, and vertical amplitude were smaller in the OPEN than in the NORM group. Interestingly, BBF increased less in the OPEN group. Correlation analysis revealed that several parameters, including number of occlusal contacts and closing angle, were correlated with changes in BBF during mastication. These results suggest that not only occlusion but also jaw movement variables and factors related to masticatory muscles contribute to the chewing-related increase in BBF. In conclusion, BBF increases less during mastication in patients with OPEN than in those with NORM. In addition, the higher increase in BBF is correlated with jaw movement. Together, we discovered that OPEN exhibits significant adverse effects not only on masticatory function but also on brain function.
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Affiliation(s)
| | - Hiroyuki Kanzaki
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama 230-8501, Japan; (C.K.); (M.K.); (S.S.); (K.Y.); (Y.I.); (F.K.); (H.T.)
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3
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Smit MJD, Nijholt W, Bakker MH, Visser A. The predictive value of masticatory function for adverse health outcomes in older adults: a systematic review. J Nutr Health Aging 2024; 28:100210. [PMID: 38489994 DOI: 10.1016/j.jnha.2024.100210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Accepted: 12/31/2023] [Indexed: 03/17/2024]
Abstract
Masticatory function is associated with a variety of health outcomes. The aim of this systematic review is to clarify the predictive value of masticatory function for adverse health outcomes, such as frailty, sarcopenia and malnutrition, in older adults. An online literature search covered articles published in English or Dutch in three databases (PubMed, Embase and CINAHL, last searched November 4th 2022). Inclusion criteria were: an observational study design, focus on adults aged ≥65 years and evaluation of the association between masticatory function and health outcomes. Reviews and articles published before the year 2000 were excluded. Methodological quality and risk of bias were assessed using the Quality Assessment Tool for Observational Cohort and Cross-Sectional Studies of the U.S. National Institutes of Health. Study population demographics, methods for assessing masticatory function, and the association between masticatory function and adverse health outcomes were extracted. From the 34 included studies, 5 studies had a prospective design, 2 had a retrospective design, and the other 27 studies had cross-sectional design. The majority of the studies were conducted in Japan (74%, n = 26). Twenty studies (59%) used one indicator for masticatory function, the other 41% used two (n = 9) or more (n = 5) indicators. Masticatory function was most frequently assessed with the maximum occlusal force (MOF) (79%, n = 27). The identified health outcomes were clustered into 6 categories: physical parameters and sarcopenia, history of falling, nutritional status, frailty, cognitive function and mortality. Despite the complex and multidimensional character of both masticatory function and most identified adverse health outcomes, some significant associations were reported. Prospective studies showed that reduced masticatory function in older adults is associated with incidence of frailty and frailty progression, cognitive decline and all-cause mortality. Regarding the other identified adverse health outcomes, i.e., physical measures and sarcopenia, history of falling and nutritional status, only cross-sectional studies were available and results were less concordant. As all prospective studies showed that reduced masticatory function in older adults is associated with adverse health outcomes, prevention of decline of masticatory function by adequate oral care may contribute to healthy ageing.
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Affiliation(s)
- Menke J de Smit
- Department of Gerodontology, Center for Dentistry and Oral Hygiene, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Willemke Nijholt
- Department of Gerodontology, Center for Dentistry and Oral Hygiene, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Mieke H Bakker
- Department of Gerodontology, Center for Dentistry and Oral Hygiene, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.
| | - Anita Visser
- Department of Gerodontology, Center for Dentistry and Oral Hygiene, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands; Department of Gerodontology, College of Dental Sciences, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
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Allen C, Garner DP. The effects of jaw clenching and mouthpiece use on bat swing velocity in Division II athletes. J Sports Sci 2024; 42:763-768. [PMID: 38873943 DOI: 10.1080/02640414.2024.2363714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Accepted: 05/28/2024] [Indexed: 06/15/2024]
Abstract
Research assessing the effects of mouthpieces on an individual's aerobic, anaerobic, or muscular performance have attributed cited improvements to the participant's ability to jaw clench. Jaw clenching research finds positive outcomes with the task of jaw clenching with targeted muscle groups in a controlled laboratory setting. Thus, the study's goal was to determine if the addition of a mouthpiece would positively affect performance outcomes in a field-based whole-body muscle movement. Fourteen participants (8=F and 6=M) NCAA softball and baseball athletes completed 5 maximal bat swings with and without a mouthpiece in 4 conditions: no jaw clenching (NC), mouthpiece and jaw clenching (MP+C), mouthpiece only (MP), and jaw clenching only (C). Significant differences occurred in conditions, with the highest velocity noted in the combined condition of MP+C (71.9 mph) as compared to NC (67.9 mph), MP (68.6 mph), and C (70.9 mph). A repeated measures ANOVA demonstrated significant differences with bat swing velocity (F = 13.19, df 3, p < 0.0001). Pairwise comparisons revealed significant differences in MP+C with MP (p = 0.007); MP+C with NC (p = 0.001), and C with NC (p = 0.009). The results of this study provide evidence of jaw clenching's positive effects on the dynamic, whole-body explosive activity of a bat swing.
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Affiliation(s)
- Charles Allen
- Exercise Science Program, Florida Southern College, Lakeland, FL, USA
| | - Dena P Garner
- Department of Health and Human Performance, The Citadel, Charleston, SC, USA
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Douma JG, Vuijk PJ, Volkers KM, Scherder EJA. Observing videos of mastication in dementia: Results of a clustered randomised controlled trial. J Oral Rehabil 2024; 51:546-555. [PMID: 38041598 DOI: 10.1111/joor.13618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Revised: 10/24/2023] [Accepted: 10/28/2023] [Indexed: 12/03/2023]
Abstract
OBJECTIVES The aim of this study was to examine effects of the observation of video-recorded chewing in a daily setting on mixing ability, cognition, activities of daily living, depressive symptoms and quality of life of older adults with dementia. METHODS A clustered randomised controlled trial was carried out with residents from 14 residential care facilities. n = 56 participants' data were analysed. An experimental group watched videos of people chewing, displayed on tablet-PCs during lunch, while a control group watched videos of nature and buildings. This was scheduled to take place 5 days a week for 12 weeks. A two-colour chewing gum test was used to measure mixing ability, neuropsychological tests for cognition and questionnaires for the other outcomes. Effects were examined via hierarchical linear mixed model analyses for T1-T3 (i.e. pre-, halfway and post-intervention). When a significant interaction effect was found, T4 (follow-up) was also included. RESULTS The experimental (n = 27) and control (n = 28) groups differed on a few variables at baseline. A significant Time*Group interaction effect was found for the Mini-Mental State Examination only (b = 1.18, t(48.35) = 2.53, p = .015), in favour of the experimental group. A significant effect was also found, albeit smaller, when T4 was included. CONCLUSION One potential reason for the intervention effect on cognition is activation of specific brain areas. Some challenges associated with conducting this intervention in a daily setting are presented. Further research is required before a well-considered decision can be made regarding any potential implementation. TRIAL REGISTRATION Number: NTR5124. Date of registration: 30 March 2015, retrospectively registered (during participant inclusion).
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Affiliation(s)
- Johanna Gerdine Douma
- Clinical Neuropsychology, Department of Clinical, Neuro- & Developmental Psychology, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Pieter Jelle Vuijk
- Center for Genomic Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Karin Mariëlle Volkers
- Clinical Neuropsychology, Department of Clinical, Neuro- & Developmental Psychology, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
- Research Center, Philadelphia Care Foundation, Amersfoort, The Netherlands
| | - Erik Johan Anton Scherder
- Clinical Neuropsychology, Department of Clinical, Neuro- & Developmental Psychology, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
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Esmaeili A, Ebrahimpour S, Hefshejani KF, Esmaeili A. Molecular mechanisms underlying the effect of tooth shortening on memory dysfunction in Wistar male rat. Arch Oral Biol 2024; 159:105878. [PMID: 38171058 DOI: 10.1016/j.archoralbio.2023.105878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2023] [Revised: 12/15/2023] [Accepted: 12/27/2023] [Indexed: 01/05/2024]
Abstract
OBJECTIVE We investigated the effects of molar tooth shortening on the mRNA expression of the AβPP/BACE1, BDNF/TrkB, and Bax/Bcl-2 signaling pathways in the Wistar male rat hippocampal regions. DESIGN Four groups (n = 5 per group) of male Wistar rats (control, SRM (shortened right molar), SLM (shortened left molar), and SBM (shortened bilateral molar)) were used. RNA was isolated from the hippocampus and transformed into cDNA. Real-time quantitative PCR was used to evaluate the mRNA expression levels of AβPP, BACE1, Bax, Bcl-2, BDNF, and TrkB. RESULTS Differential mRNA expression was observed in rat groups. SBM significantly upregulated the AβPP, BACE1, and Bax mRNA expressions, whereas the expression levels of Bcl-2, BDNF, and TrkB were decreased. SRM and SLM approximately had the same effect on the expression enhancement of AβPP, BACE1, and Bax; however, SRM was more effective than SLM in increasing the expression of these genes. CONCLUSIONS Symmetrical molar teeth shortening affected the mRNA expression of AβPP and BACE1, which is related to learning and memory dysfunction.
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Affiliation(s)
- Ali Esmaeili
- Dental Materials Research Center, Dental Research Institute, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Shiva Ebrahimpour
- Department of Cell and Molecular Biology & Microbiology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran
| | | | - Abolghasem Esmaeili
- Department of Cell and Molecular Biology & Microbiology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran.
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Knijn FV, Verhoeff MC, Bindels KL, Fuh JL, Lin CS, Su N, Lobbezoo F. Are demographic factors, masticatory performance and structural brain signatures associated with cognitive impairment in older people? A pilot study of cross-sectional neuroimaging data. J Oral Rehabil 2024; 51:321-327. [PMID: 37727024 DOI: 10.1111/joor.13591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 08/04/2023] [Accepted: 08/17/2023] [Indexed: 09/21/2023]
Abstract
BACKGROUND The occurrence of cognitive impairment (CI) is expected to increase within an ageing population. CI is associated with tooth loss, which influences masticatory performance. A decrease in masticatory performance may cause functional and morphological changes in the brain. However, whether CI is associated with masticatory performance, demographics, and structural brain signatures has not been studied yet. OBJECTIVES To assess the associations between CI on the one hand, and masticatory performance, demographic factors, and structural brain signatures (i.e. cortical volume and thickness) on the other hand. METHODS In total, 18 older adults with CI (mean ± SD age = 72.2 ± 9.5 years) and 68 older adults without CI (65.7 ± 7.5 years) were included in this study. Masticatory performance was quantified using a colour-changeable chewing gum. A Magnetic Resonance Imaging (MRI) scan was used to map structural brain signatures. To study our aim, a multivariate binary logistic regression analysis with backward selection was performed. RESULTS The cortical volume of the right entorhinal cortex was negatively associated with CI (p < .01). However, demographic factors, masticatory performance, and the other structural brain signatures under investigation were not associated with CI. CONCLUSION A decrease in the volume of the right entorhinal cortex is associated with CI in older people.
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Affiliation(s)
- Fleur V Knijn
- Department of Orofacial pain and Dysfunction, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Merel C Verhoeff
- Department of Orofacial pain and Dysfunction, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Karlijn L Bindels
- Department of Orofacial pain and Dysfunction, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Jong-Ling Fuh
- Division of General Neurology, Department of Neurology, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Chia-Shu Lin
- Department of Dentistry, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Naichuan Su
- Department of Oral Public Health, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Frank Lobbezoo
- Department of Orofacial pain and Dysfunction, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
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Rivier CA, Renedo DB, de Havenon A, Sunmonu NA, Gill TM, Payabvash S, Sheth KN, Falcone GJ. Association of Poor Oral Health With Neuroimaging Markers of White Matter Injury in Middle-Aged Participants in the UK Biobank. Neurology 2024; 102:e208010. [PMID: 38165331 PMCID: PMC10870735 DOI: 10.1212/wnl.0000000000208010] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Accepted: 10/03/2023] [Indexed: 01/03/2024] Open
Abstract
BACKGROUND AND OBJECTIVES Poor oral health is a modifiable risk factor that is associated with clinically observed cardiovascular disease. However, the relationship between oral and brain health is not well understood. We tested the hypothesis that poor oral health is associated with worse neuroimaging brain health profiles in middle-aged persons without stroke or dementia. METHODS We performed a 2-stage cross-sectional neuroimaging study using UK Biobank data. First, we tested for association between self-reported poor oral health and MRI neuroimaging markers of brain health. Second, we used Mendelian randomization (MR) analyses to test for association between genetically determined poor oral health and the same neuroimaging markers. Poor oral health was defined as the presence of dentures or loose teeth. As instruments for the MR analysis, we used 116 independent DNA sequence variants linked to increased composite risk of dentures or teeth that are decayed, missing, or filled. Neuroimaging markers of brain health included white matter hyperintensity (WMH) volume and aggregate measures of fractional anisotropy (FA) and mean diffusivity (MD), 2 metrics indicative of white matter tract disintegrity obtained through diffusion tensor imaging across 48 brain regions. RESULTS We included 40,175 persons (mean age 55 years, female sex 53%) enrolled from 2006 to 2010, who underwent a dedicated research brain MRI between 2014 and 2016. Among participants, 5,470 (14%) had poor oral health. Poor oral health was associated with a 9% increase in WMH volume (β = 0.09, SD = 0.014, p < 0.001), 10% change in aggregate FA score (β = 0.10, SD = 0.013, p < 0.001), and 5% change in aggregate MD score (β = 0.05, SD = 0.013, p < 0.001). Genetically determined poor oral health was associated with a 30% increase in WMH volume (β = 0.30, SD = 0.06, p < 0.001), 43% change in aggregate FA score (β = 0.43, SD = 0.06, p < 0.001), and 10% change in aggregate MD score (β = 0.10, SD = 0.03, p < 0.01). DISCUSSION Among middle age Britons without stroke or dementia, poor oral health was associated with worse neuroimaging brain health profiles. Genetic analyses confirmed these associations, supporting a potentially causal association. Because the neuroimaging markers evaluated in this study precede and are established risk factors of stroke and dementia, our results suggest that oral health, an easily modifiable process, may be a promising target for very early interventions focused on improving brain health.
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Affiliation(s)
- Cyprien A Rivier
- From the Departments of Neurology (C.A.R., D.B.R., A.d.H., N.A.S., K.N.S., G.J.F.), Internal Medicine (T.M.G.), and Radiology (S.P.), Yale University School of Medicine; and Yale Center for Brain and Mind Health (C.A.R., A.d.H., S.P., K.N.S., G.J.F.), New Haven, CT
| | - Daniela B Renedo
- From the Departments of Neurology (C.A.R., D.B.R., A.d.H., N.A.S., K.N.S., G.J.F.), Internal Medicine (T.M.G.), and Radiology (S.P.), Yale University School of Medicine; and Yale Center for Brain and Mind Health (C.A.R., A.d.H., S.P., K.N.S., G.J.F.), New Haven, CT
| | - Adam de Havenon
- From the Departments of Neurology (C.A.R., D.B.R., A.d.H., N.A.S., K.N.S., G.J.F.), Internal Medicine (T.M.G.), and Radiology (S.P.), Yale University School of Medicine; and Yale Center for Brain and Mind Health (C.A.R., A.d.H., S.P., K.N.S., G.J.F.), New Haven, CT
| | - N Abimbola Sunmonu
- From the Departments of Neurology (C.A.R., D.B.R., A.d.H., N.A.S., K.N.S., G.J.F.), Internal Medicine (T.M.G.), and Radiology (S.P.), Yale University School of Medicine; and Yale Center for Brain and Mind Health (C.A.R., A.d.H., S.P., K.N.S., G.J.F.), New Haven, CT
| | - Thomas M Gill
- From the Departments of Neurology (C.A.R., D.B.R., A.d.H., N.A.S., K.N.S., G.J.F.), Internal Medicine (T.M.G.), and Radiology (S.P.), Yale University School of Medicine; and Yale Center for Brain and Mind Health (C.A.R., A.d.H., S.P., K.N.S., G.J.F.), New Haven, CT
| | - Seyedmehdi Payabvash
- From the Departments of Neurology (C.A.R., D.B.R., A.d.H., N.A.S., K.N.S., G.J.F.), Internal Medicine (T.M.G.), and Radiology (S.P.), Yale University School of Medicine; and Yale Center for Brain and Mind Health (C.A.R., A.d.H., S.P., K.N.S., G.J.F.), New Haven, CT
| | - Kevin N Sheth
- From the Departments of Neurology (C.A.R., D.B.R., A.d.H., N.A.S., K.N.S., G.J.F.), Internal Medicine (T.M.G.), and Radiology (S.P.), Yale University School of Medicine; and Yale Center for Brain and Mind Health (C.A.R., A.d.H., S.P., K.N.S., G.J.F.), New Haven, CT
| | - Guido J Falcone
- From the Departments of Neurology (C.A.R., D.B.R., A.d.H., N.A.S., K.N.S., G.J.F.), Internal Medicine (T.M.G.), and Radiology (S.P.), Yale University School of Medicine; and Yale Center for Brain and Mind Health (C.A.R., A.d.H., S.P., K.N.S., G.J.F.), New Haven, CT
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Fiegler-Rudol J, Niemczyk W, Netkowska M, Demel K, Talaska J, Klimczak T, Hochuł D, Zawilska A. The influence of parenteral nutrition on the condition of the oral cavity: literature review. WIADOMOSCI LEKARSKIE (WARSAW, POLAND : 1960) 2024; 77:1069-1073. [PMID: 39008599 DOI: 10.36740/wlek202405129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/17/2024]
Abstract
Oral health plays a pivotal role in the overall well-being of patients. This article delves into the intricate interplay between oral health and systemic health outcomes in various patient populations, including those undergoing parenteral nutrition in childhood, individuals with impaired swallowing function, and those reliant on long-term enteral or parenteral nutrition. Through a comprehensive review of existing literature, the multifaceted role of oral health maintenance in optimizing nutritional therapy outcomes and enhancing overall quality of life is explored. Alternative forms of nutrition have a profound impact on Oral microbiota, which in turn is reflected in general health and wellbeing. Despite its significance, the importance of systematic oral health assessments and nurse involvement in providing holistic care to patients with complex medical needs has been underestimated. By elucidating critical connections between oral health and systemic health outcomes, this article aims to underscore the significance of oral health in comprehensive patient care and stimulate further research to advance our understanding of this crucial aspect of healthcare management.
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Affiliation(s)
- Jakub Fiegler-Rudol
- STUDENT SCIENTIFIC SOCIETY AT THE DEPARTMENT OF CONSERVATIVE DENTISTRY WITH ENDODONTICS, MEDICAL UNIVERSITY OF SILESIA, KATOWICE, POLAND
| | - Wojciech Niemczyk
- STUDENT SCIENTIFIC SOCIETY AT THE DEPARTMENT OF CONSERVATIVE DENTISTRY WITH ENDODONTICS, MEDICAL UNIVERSITY OF SILESIA, KATOWICE, POLAND
| | | | - Karol Demel
- FACULTY OF MEDICAL SCIENCES, MEDICAL UNIVERSITY OF SILESIA, KATOWICE, POLAND
| | - Justyna Talaska
- FACULTY OF MEDICAL SCIENCES, MEDICAL UNIVERSITY OF SILESIA, KATOWICE, POLAND
| | - Tytus Klimczak
- FACULTY OF MEDICAL SCIENCES, MEDICAL UNIVERSITY OF SILESIA, KATOWICE, POLAND
| | - Dawid Hochuł
- FACULTY OF MEDICAL SCIENCES, MEDICAL UNIVERSITY OF SILESIA, KATOWICE, POLAND
| | - Anna Zawilska
- DEPARTMENT OF CONSERVATIVE DENTISTRY WITH ENDODONTICS, MEDICAL UNIVERSITY OF SILESIA, KATOWICE, POLAND
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Lin CS, Chen TC, Verhoeff MC, Lobbezoo F, Trulsson M, Fuh JL. An umbrella review on the association between factors of oral health and cognitive dysfunction. Ageing Res Rev 2024; 93:102128. [PMID: 38007045 DOI: 10.1016/j.arr.2023.102128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 11/09/2023] [Accepted: 11/14/2023] [Indexed: 11/27/2023]
Abstract
An increasing number of systematic reviews and meta-analyses have been published on the association between oral health and cognitive dysfunction, also known as oral-cognitive links. However, there is great diversity in the oral and cognitive factors included in these studies, with different opinions for clinical practice drawn from the evidence. To understand which oral and cognitive factors are involved in those associations, we conducted an umbrella review of 28 systematic reviews, including 12 meta-analyses, on oral-cognitive links. We found that (a) periodontal diseases, oral microbiome, and dementia were frequently studied, while other factors, such as mastication and mild cognitive impairment, were less commonly investigated, and (b) severe deterioration of oral health, such as severe periodontitis or extensive tooth loss, rather than the presence of oral diseases alone, was strongly associated with cognitive dysfunction. In conclusion, the diversity of oral and cognitive factors included in the review studies reflects the complexity of oral-cognitive links. Clarifying the factors helps to form evidence-based clinical advice for healthcare.
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Affiliation(s)
- Chia-Shu Lin
- Department of Dentistry, National Yang Ming Chiao Tung University, Taiwan; Institute of Brain Science, National Yang Ming Chiao Tung University, Taiwan; Brain Research Center, National Yang Ming Chiao Tung University, Taiwan; Oral Medicine Innovation Center, National Yang Ming Chiao Tung University, Taiwan.
| | - Ta-Chung Chen
- Division of Prosthodontics, Department of Stomatology, Taipei Veterans General Hospital, Taiwan
| | - Merel Charlotte Verhoeff
- Department of Orofacial Pain and Dysfunction, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | - Frank Lobbezoo
- Department of Orofacial Pain and Dysfunction, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | - Mats Trulsson
- Division of Oral Diagnostics and Rehabilitation, Department of Dental Medicine, Karolinska Institutet, Huddinge, Sweden; Academic Center for Geriatric Dentistry, Karolinska Institutet, Stockholm, Sweden
| | - Jong-Ling Fuh
- Institute of Brain Science, National Yang Ming Chiao Tung University, Taiwan; Department of Neurology, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan; School of Medicine, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
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Lee S, Tochinai R, Yasuoka A, Nagai T, Saito Y, Kuwahara M, Abe K, Asakura T. Mastication stimuli regulate the heartbeat rate through rhythmic regulation by the hypothalamic-autonomic system; molecular and telemetric studies in weaning-stage rats. Front Neurosci 2023; 17:1260655. [PMID: 37781249 PMCID: PMC10536135 DOI: 10.3389/fnins.2023.1260655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Accepted: 09/01/2023] [Indexed: 10/03/2023] Open
Abstract
Mastication stimuli have been demonstrated to affect memory function and autonomic nerve activity; however, this process has not been well studied during weaning compared to old age. Previously, we conducted molecular analyses of the thalamus and hippocampus to elucidate the mechanisms underlying this memory-enhancing effect in weaning-stage rats. In this study, we aimed to evaluate the effect of masticatory stimuli on the regulation of heartbeat rate (HR) through the hypothalamic-autonomic system. Three-week-old male rats were administered a powdered diet (P group) or chow-diet (C group) for 10 days. Thereafter, transcriptome analysis was performed. Vasopressin, cocaine-amphetamine-regulated transcript prepropeptide, corticotropin-releasing hormone, and thyrotropin-releasing hormone, which are involved in sympathetic activation of heart rate, were downregulated in the C group. Electrocardiograms were recorded continuously for 12 days under the same condition. Interestingly, rats in the C group had a significantly lower HR than those in the P group on day 11. We checked several parameters representing the autonomic regulation of HR. The C group had higher values for the high-frequency band integration of the HR power spectrum (parasympathetic marker) and root mean square successive difference of R-wave intervals (parasympathetic marker) relative to the P group. Such findings provide a molecular and physiological basis for understanding the regulation of cardiovascular function in response to masticatory stimuli in the autonomic nervous system.
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Affiliation(s)
- Seonmi Lee
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Ryota Tochinai
- Department of Veterinary Pathophysiology and Animal Health, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Akihito Yasuoka
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
- Department of Human Nutrition, Seitoku University, Chiba, Japan
| | - Toshitada Nagai
- Department of Applied Biological Science, Faculty of Agriculture, Takasaki University of Health and Welfare, Gunma, Japan
| | - Yoshikazu Saito
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
- Toyo Institute of Food Technology, Hyogo, Japan
| | - Masayoshi Kuwahara
- Department of Veterinary Pathophysiology and Animal Health, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Keiko Abe
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
- Project on Health and Anti-Aging, Kanagawa Academy of Science and Technology, Life Science and Environment Research Center (LiSE), Kawasaki, Japan
| | - Tomiko Asakura
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
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Ebrahimpour S, Esmaeili A, Esmaeili A, Sattari K, Forouzandeh Hafshejani K. Molar tooth shortening induces learning and memory impairment in Wistar rat. Oral Dis 2023; 29:1356-1366. [PMID: 34862999 DOI: 10.1111/odi.14093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2021] [Revised: 10/26/2021] [Accepted: 11/28/2021] [Indexed: 11/28/2022]
Abstract
OBJECTIVE This study aimed to investigate the relationship between different patterns of molar crown loss and the association between symmetrical and asymmetrical shortening molar teeth with memory impairment. MATERIALS AND METHODS Male Wistar rats were divided into four groups (n = 10) including control, SLM (shortened left molar), SRM (shortened right molar), and SBM (shortened bilateral molar) groups. Morris water maze (MWM) and passive avoidance test (PAT) were performed to assess spatial and fear memory, respectively. Besides, histological assessment of hippocampus and gingival tissues was done. RESULTS In the MWM test, SBM and SLM groups had higher escape latency over training trials and spent less time in the target quadrant in the probe trial (p < 0.01). In the PAT, step-through latency was significantly reduced in three groups, and time spent in the dark compartment increased in SBM (p < 0.01) and SLM (p < 0.05) groups. In addition, each teeth shortening group indicated a reduction in density (p < 0.01) and thickness layer (p < 0.05) of pyramidal cells. Gingival was normal after shortening of the molar crown. CONCLUSIONS Different patterns of molar teeth shortening induced learning and memory impairment; however, symmetrical molar teeth shortening has more effects on memory impairment.
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Affiliation(s)
- Shiva Ebrahimpour
- Department of Cell and Molecular Biology & Microbiology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran
| | - Abolghasem Esmaeili
- Department of Cell and Molecular Biology & Microbiology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran
| | - Ali Esmaeili
- School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Kimiya Sattari
- School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
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Rivier CA, Renedo D, de Havenon A, Gill TM, Payabvash S, Sheth KN, Falcone GJ. Poor Oral Health Is Associated with Worse Brain Imaging Profiles. MEDRXIV : THE PREPRINT SERVER FOR HEALTH SCIENCES 2023:2023.03.18.23287435. [PMID: 36993472 PMCID: PMC10055602 DOI: 10.1101/2023.03.18.23287435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Importance Poor oral health is a modifiable risk factor that is associated with a variety of health outcomes. However, the relationship between oral and brain health is not well understood. Objective To test the hypothesis that poor oral health is associated with worse neuroimaging brain health profiles in persons without stroke or dementia. Design We conducted a 2-stage cross-sectional neuroimaging study using data from the UK Biobank (UKB). First, we tested for association between self-reported poor oral health and MRI neuroimaging markers of brain health. Second, we used Mendelian Randomization (MR) analyses to test for association between genetically-determined poor oral health and the same neuroimaging markers. Setting Ongoing population study in the United Kingdom. The UKB enrolled participants between 2006 and 2010. Data analysis was performed from September 1, 2022, to January 10, 2023. Participants 40,175 persons aged 40 to 70 enrolled between 2006 to 2010 who underwent a dedicated research brain MRI between 2012 and 2013. Exposures During MRI assessment, poor oral health was defined as the presence of dentures or loose teeth. As instruments for the MR analysis, we used 116 independent DNA sequence variants known to significantly increase the composite risk of decayed, missing, or filled teeth and dentures. Main Outcomes and Measures As neuroimaging markers of brain health, we assessed the volume of white matter hyperintensities (WMH), as well as aggregate measures of fractional anisotropy (FA) and mean diffusivity (MD), two metrics indicative of white matter tract disintegrity obtained through diffusion tensor imaging. These measurements were evaluated across 48 distinct brain regions, with FA and MD values for each region also considered as individual outcomes for the MR method. Results Among study participants, 5,470 (14%) had poor oral health. We found that poor oral health was associated with a 9% increase in WMH volume (beta = 0.09, standard deviation (SD) = 0.014, p P< 0.001), a 10% change in the aggregate FA score (beta = 0.10, SD = 0.013, P < 0.001), and a 5% change in the aggregate MD score (beta = 0.05, SD = 0.013, P < 0.001). Genetically-determined poor oral health was associated with a 30% increase in WMH volume (beta = 0.30, SD = 0.06, P < 0.001), a 43% change in aggregate FA score (beta = 0.42, SD = 0.06, P < 0.001), and an 10% change in aggregate MD score (beta = 0.10, SD = 0.03, P = 0.01). Conclusions and Relevance Among middle age Britons without stroke or dementia enrolled in a large population study, poor oral health was associated with worse neuroimaging brain health profiles. Genetic analyses confirmed these associations, supporting a potential causal association. Because the neuroimaging markers evaluated in the current study are established risk factors for stroke and dementia, our results suggest that oral health may be a promising target for interventions focused on improving brain health.
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Affiliation(s)
- Cyprien A. Rivier
- Department of Neurology, Yale University School of Medicine, New Haven, CT, USA
| | - Daniela Renedo
- Department of Neurology, Yale University School of Medicine, New Haven, CT, USA
| | - Adam de Havenon
- Department of Neurology, Yale University School of Medicine, New Haven, CT, USA
- Yale Center for Brain and Mind Health, New Haven, CT, USA
| | - Thomas M. Gill
- Department of Internal Medicine, Yale School of Medicine, 06510, New Haven, CT, United States
| | - Sam Payabvash
- Department of Radiology, Yale University School of Medicine, New Haven, CT, USA
- Yale Center for Brain and Mind Health, New Haven, CT, USA
| | - Kevin N. Sheth
- Department of Neurology, Yale University School of Medicine, New Haven, CT, USA
- Yale Center for Brain and Mind Health, New Haven, CT, USA
| | - Guido J. Falcone
- Department of Neurology, Yale University School of Medicine, New Haven, CT, USA
- Yale Center for Brain and Mind Health, New Haven, CT, USA
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Matsumoto H, Tagai K, Endo H, Matsuoka K, Takado Y, Kokubo N, Shimada H, Goto T, Goto TK, Higuchi M. Association of Tooth Loss with Alzheimer's Disease Tau Pathologies Assessed by Positron Emission Tomography. J Alzheimers Dis 2023; 96:1253-1265. [PMID: 37980663 PMCID: PMC10741329 DOI: 10.3233/jad-230581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/24/2023] [Indexed: 11/21/2023]
Abstract
BACKGROUND Deterioration of the oral environment is one of the risk factors for dementia. A previous study of an Alzheimer's disease (AD) model mouse suggests that tooth loss induces denervation of the mesencephalic trigeminal nucleus and neuroinflammation, possibly leading to accelerated tau dissemination from the nearby locus coeruleus (LC). OBJECTIVE To elucidate the relevance of oral conditions and amyloid-β (Aβ) and tau pathologies in human participants. METHODS We examined the number of remaining teeth and the biofilm-gingival interface index in 24 AD-spectrum patients and 19 age-matched healthy controls (HCs). They also underwent positron emission tomography (PET) imaging of Aβ and tau with specific radiotracers, 11C-PiB and 18F-PM-PBB3, respectively. All AD-spectrum patients were Aβ-positive, and all HCs were Aβ-negative. We analyzed the correlation between the oral parameters and radiotracer retention. RESULTS No differences were found in oral conditions between the AD and HC groups. 11C-PiB retentions did not correlate with the oral indices in either group. In AD-spectrum patients, brain-wide, voxel-based image analysis highlighted several regions, including the LC and associated brainstem substructures, as areas where 18F-PM-PBB3 retentions negatively correlated with the remaining teeth and revealed the correlation of tau deposits in the LC (r = -0.479, p = 0.018) primarily with the hippocampal and neighboring areas. The tau deposition in none of the brain regions was associated with the periodontal status. CONCLUSIONS Our findings with previous preclinical evidence imply that tooth loss may enhance AD tau pathogenesis, promoting tau spreading from LC to the hippocampal formation.
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Affiliation(s)
- Hideki Matsumoto
- Department of Oral and Maxillofacial Radiology, Tokyo Dental College, Tokyo, Japan
- Department of Functional Brain Imaging Research, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba, Japan
| | - Kenji Tagai
- Department of Functional Brain Imaging Research, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba, Japan
- Department of Psychiatry, The Jikei University of Medicine, Tokyo, Japan
| | - Hironobu Endo
- Department of Functional Brain Imaging Research, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba, Japan
| | - Kiwamu Matsuoka
- Department of Functional Brain Imaging Research, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba, Japan
| | - Yuhei Takado
- Department of Functional Brain Imaging Research, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba, Japan
| | - Naomi Kokubo
- Department of Functional Brain Imaging Research, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba, Japan
| | - Hitoshi Shimada
- Department of Functional Brain Imaging Research, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba, Japan
- Department of Functional Neurology & Neurosurgery, Center for Integrated Human Brain Science, Brain Research Institute, Niigata University, Niigata, Japan
| | - Tetsuya Goto
- Department of Oral Anatomy and Cell Biology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Tazuko K. Goto
- Department of Oral and Maxillofacial Radiology, Tokyo Dental College, Tokyo, Japan
- Department of Functional Brain Imaging Research, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba, Japan
- Tokyo Dental College Research Branding Project, Tokyo Dental College, Tokyo, Japan
- Faculty of Dentistry, The University of Hong Kong, Hong Kong, China
| | - Makoto Higuchi
- Department of Functional Brain Imaging Research, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba, Japan
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Hasegawa Y, Sakuramoto A, Suzuki T, Sakagami J, Shiramizu M, Tachibana Y, Kishimoto H, Ono Y, Ono T. Emotional modulation of cortical activity during gum chewing: A functional near-infrared spectroscopy study. Front Neurosci 2022; 16:964351. [DOI: 10.3389/fnins.2022.964351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 11/10/2022] [Indexed: 11/30/2022] Open
Abstract
Distinct brain regions are known to be associated with various emotional states. Cortical activity may be modulated by emotional states that are triggered by flavors during food intake. We examined cortical activity during chewing with different flavors and assessed the emotional modulation of cortical activity using multichannel near-infrared spectroscopy. Thirty-six right-handed volunteers participated in this crossover trial. The participants experienced positive and negative emotions from chewing flavorful (palatable) or less flavorful (unpalatable) gums, respectively for 5 min. Participants rated the taste, odor, and deliciousness of each gum using a visual analog scale. Bilateral hemodynamic responses in the frontal and parietal lobes, bilateral masseter muscle activation, and heart rate were measured during gum chewing. Changes in all measured data during gum chewing were also evaluated. The ratings of the tastes and odors of each gum significantly differed among the participants (P < 0.001). Hemodynamic response changes were significantly elevated in the bilateral primary sensorimotor cortex during gum-chewing, in comparison to resting. The difference in hemodynamic responses between palatable and unpalatable gum conditions was detected in the left frontopolar/dorsolateral prefrontal cortex. Muscle activation and heart rate were not significantly different between different gum types. Our findings indicate that differential processing in the left prefrontal cortex might be responsible for the emotional states caused by palatable and unpalatable foods.
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16
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Lu Y, Pang Q, Wu Q, Luo B, Tang X, Jiang Q. Molar loss further exacerbates 2-VO-induced cognitive impairment associated with the activation of p38MAPK/NFκB pathway. Front Aging Neurosci 2022; 14:930016. [DOI: 10.3389/fnagi.2022.930016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 10/11/2022] [Indexed: 11/06/2022] Open
Abstract
BackgroundVascular dementia is characterized by reduced cognitive function due to chronic cerebral hypoperfusion and has become a significant public health challenge as the global population ages. Recent studies suggested that molar loss, a common problem among the elderly, may trigger the development of cognitive decline. Our previous study found that the molar loss affected cognitive dysfunction, and the astrocytes in the hippocampus of chronic cerebral ischemia rats were affected, but the underlying mechanism is unclear.MethodsIn this study, we established the animal model of molar loss with 2-VO rats and the Morris water maze was used to test the cognitive ability of rats in each group. The damage to neurons was observed via Nissl staining, and neuronal apoptosis was analyzed by terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay in the hippocampus of the rats. Quantitative Real-Time PCR and immunohistochemistry and histology (IHC) were used to detect the expression of p38MAPK, NFκB, caspase 3, and iNOS in the hippocampus. The astrocytes were detected by IHC and Immunofluorescence analysis for GFAP. After 2-VO MO surgery, rats were administered DMSO or p38MAPK inhibitor (SB203580) by intrathecal injection.ResultsThe Morris water maze test showed that the molar loss aggravated spatial memory learning ability with chronic cerebral ischemia decreased in the rats. The neuronal damage and more apoptotic cells were observed in the hippocampus of 2-VO rats. After the molar loss, the mRNA and protein expression of iNOS, p38MAPK, NFκB, and caspase 3 were further upregulated in 2-VO rats. Molar loss upregulated GFAP expression, and the p38MAPK-positive cells were labeled with the astrocyte marker GFAP. SB203580 reduced cognitive impairment and apoptosis of hippocampal neurons in 2-VO rats following the molar loss.ConclusionMolar loss can aggravate cognitive impairment in 2-VO rats to a certain extent. The mechanism of molar loss exacerbating the cognitive decline in 2-VO rats may be associated with the activation of the p38MAPK-NFκB-caspase 3 signaling pathway, which induces neuronal apoptosis.
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17
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Wang X, Hu J, Jiang Q. Tooth Loss-Associated Mechanisms That Negatively Affect Cognitive Function: A Systematic Review of Animal Experiments Based on Occlusal Support Loss and Cognitive Impairment. Front Neurosci 2022; 16:811335. [PMID: 35221901 PMCID: PMC8866659 DOI: 10.3389/fnins.2022.811335] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 01/18/2022] [Indexed: 12/15/2022] Open
Abstract
BackgroundThere is a dose-response relationship between tooth loss and cognitive impairment, while tooth loss can be an independent risk factor for Alzheimer's disease (AD) and vascular dementia (VaD). Tooth loss can also accelerate nerve damage and neurodegeneration. However, the associated mechanisms remain poorly understood.ObjectiveTo conduct a systematic review of animal experiments on cognitive decline caused by the loss of occlusal support performed over the past 10 years and summarize the possible underlying mechanisms.Methods“Tooth Loss,” “Edentulous,” “Tooth Extraction and Memory Loss,” “Cognition Impairment,” and “Dementia” were used as keywords to search PubMed, Embase, SCI, ScienceDirect, and OpenGrey. A total of 1,317 related articles from 2010 to 2021 were retrieved, 26 of which were included in the review after screening according to predetermined inclusion and exclusion criteria. Comprehensiveness was evaluated using ARRIVE guidelines and the risk of bias was assessed using SYCLE'S risk of bias tool.ResultsThe putative mechanisms underlying the cognitive impairment resulting from the loss of occlusal support are as follows: (1) The mechanical pathway, whereby tooth loss leads to masticatory motor system functional disorders. Masticatory organ activity and cerebral blood flow decrease. With reduced afferent stimulation of peripheral receptors (such as in the periodontal membrane) the strength of the connections between neural pathways is decreased, and the corresponding brain regions degenerate; (2) the aggravation pathway, in which tooth loss aggravates existing neurodegenerative changes. Tooth loss can accelerates nerve damage through apoptosis and mitochondrial autophagy, increases amyloid deposition in the brain; and (3) the long-term inflammatory stress pathway, which involves metabolic disorders, microbial-gut-brain axis, the activation of microglia and astrocytes, and inflammatory cascade effect in central nervous system.ConclusionThe loss of occlusal support may lead to cognitive dysfunction through the reduction of chewing-related stimuli, aggravation of nerve damage, and long-term inflammatory stress.
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18
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van de Rijt LJM, Feast AR, Vickerstaff V, Sampson EL, Lobbezoo F. Oral function and its association with nutrition and quality of life in nursing home residents with and without dementia: A cross-sectional study. Gerodontology 2021; 38:404-413. [PMID: 33521997 PMCID: PMC9291735 DOI: 10.1111/ger.12535] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Revised: 12/23/2020] [Accepted: 01/08/2021] [Indexed: 12/11/2022]
Abstract
Background Oral health problems increase with age, and are common in nursing home residents, especially in those with dementia. These problems can lead to tooth loss, diminished oral function and malnutrition. Objectives To compare oral function, nutritional status and quality of life (QoL) between residents with and without dementia, and to examine associations between these variables. Methods Cross‐sectional study conducted in four UK nursing homes. Residents aged 65 + with and without dementia were included. Information was collected on demographics, dental status, quality of swallowing and chewing, xerostomia and orofacial pain. During oral examination, information was collected on number of teeth and occlusal units (OU), and functional categories (eg, OU combined with dentures). Multiple linear regression was used for statistical analysis. Results Of 84 residents with and 27 without dementia participated. Residents with dementia had significantly fewer teeth (Dementia median (IQR) = 14 (6‐21), vs No dementia 22 (12.75‐24.25); P = .021), fewer OU (Dementia median (IQR) = 0 (0‐3), vs No dementia 4 (0‐7); P = .001) and poorer functional categories (Z = −3.283; P = .001), and nutritional status was significantly poorer than those without (Dementia Mean (SD) = 8.3 (2.7), vs No dementia 10.4 (2.0); P = .002). In the regression model, quality of chewing (Coef (95% CI) = −1.27 (−2.22, −0.31); P = .010) was significantly correlated with nutritional status. Conclusion Oral function and nutritional status of residents with dementia was poorer than those without. Almost half of all residents had insufficient oral function, which was negatively associated with QoL and nutritional status.
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Affiliation(s)
- Liza J M van de Rijt
- Department of Orofacial Pain and Dysfunction, Faculty of Dentistry, Academic Centre of Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Alexandra R Feast
- Marie Curie Palliative Care Research Department, Division of Psychiatry, University College London, London, UK
| | - Victoria Vickerstaff
- Marie Curie Palliative Care Research Department, Division of Psychiatry, University College London, London, UK.,The Research Department of Primary Care and Population Health, University College London, London, UK
| | - Elizabeth L Sampson
- Marie Curie Palliative Care Research Department, Division of Psychiatry, University College London, London, UK.,Barnet Enfield and Haringey Mental Health Trust Liaison Psychiatry Team, North Middlesex University Hospital, London, UK
| | - Frank Lobbezoo
- Department of Orofacial Pain and Dysfunction, Faculty of Dentistry, Academic Centre of Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
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Hotta H, Suzuki H, Inoue T, Stewart M. Involvement of the basal nucleus of Meynert on regional cerebral cortical vasodilation associated with masticatory muscle activity in rats. J Cereb Blood Flow Metab 2020; 40:2416-2428. [PMID: 31847668 PMCID: PMC7820681 DOI: 10.1177/0271678x19895244] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We examined the neural mechanisms for increases in regional cerebral blood flow (rCBF) in the neocortex associated with mastication, focusing on the cortical vasodilative system derived from the nucleus basalis of Meynert (NBM). In pentobarbital-anesthetized rats, parietal cortical rCBF was recorded simultaneously with electromyogram (EMG) of jaw muscles, local field potentials of frontal cortex, multi-unit activity of NBM neurons, and systemic mean arterial pressure (MAP). When spontaneous rhythmic EMG activity was observed with cortical desynchronization, an increase in NBM activity and a marked rCBF increase independent of MAP changes were observed. A similar rCBF increase was elicited by repetitive electrical stimulation of unilateral cortical masticatory areas. The magnitude of rCBF increase was partially attenuated by administration of the GABAergic agonist muscimol into the NBM. The rCBF increase persisted after immobilization with systemic muscle relaxant (vecuronium). rCBF did not change when jaw muscle activity was induced by electrical stimulation of the pyramidal tract. The results suggest that activation of NBM vasodilator neurons contributes at least in part to the rCBF increase associated with masticatory muscle activity, and that the NBM activation is induced by central commands from the motor cortex, independently of feedback from brainstem central pattern generator or contracting muscles.
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Affiliation(s)
- Harumi Hotta
- Department of Autonomic Neuroscience, Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan
| | - Harue Suzuki
- Department of Autonomic Neuroscience, Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan
| | - Tomio Inoue
- Department of Oral Physiology, School of Dentistry, Showa University, Tokyo, Japan
| | - Mark Stewart
- Department of Physiology & Pharmacology, State University of New York Downstate Medical Center, New York, NY, USA.,Department of Neurology, State University of New York Downstate Medical Center, New York, NY, USA
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20
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The Effects of Chewing Gum in Preventing Eyestrain. BIOMED RESEARCH INTERNATIONAL 2020; 2020:2470473. [PMID: 33274199 PMCID: PMC7683129 DOI: 10.1155/2020/2470473] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 10/22/2020] [Accepted: 10/27/2020] [Indexed: 12/26/2022]
Abstract
Purpose To investigate the effects of chewing gum and tablet candy to reduce eyestrain in healthy individuals. Materials and Methods A double-blinded crossover trial was conducted. Forty-six healthy individuals (23 men, 23 women) between 20 and 59 years old, feeling eyestrain, were enrolled. Each 10-year age group included 12 individuals except the 30s group, which included 10 individuals. A visual task was performed on reading material displayed on a computer screen at a fixed distance for 60 min. Gum or tablet candy of two pieces were chewed for two 15-min periods starting 15 and 45 min after starting to read. Subjects chewed gum on Day 1 and tablet candy on Day 2, and vice versa. Primary outcome is as follows: subjective eye fatigue (eye tiredness, eye heaviness, blurred vision, double vision, and eye dryness) using a visual analog scale (VAS). Secondary outcomes are as follows: subjective accommodation from near and far points of accommodation measured with a D'ACOMO, spherical equivalent refraction, and eye dryness by analyzing ring break-up time (RBUT) measured with the RT-7000 Auto Ref-Topographer. Results The VAS scores of subjective eye fatigue were not significantly changed between chewing gum and tablet candy (P = 0.397 − P = 0.909). Those scores of eye tiredness and eye heaviness were significantly longer before and after the visual task with tablet candy (P = 0.013 and P = 0.025, respectively) but not with chewing gum. The changes of subjective accommodation were significantly lower after the visual task between chewing gum and candy (P = 0.043). There were significant differences among each age group (20 s vs. 30 s, P = 0.594; 20 s vs. 40 s, P = 0.002; 20 s vs. 50 s, P = 0.002). After reading, the changes of spherical equivalent refraction did not indicate a shift toward myopia (P = 0.267). In the RBUT, there were no significant differences between the samples (P = 0.680). Conclusions Chewing gum helps improve the ability of the eye to focus, especially in young adults.
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Kuwajima Y, Nagai MS, Lee C, Galaburda AM, Kobayashi T, Nakasato A, Da Silva JD, Nagai SI, Nagai M. Trans-trigeminal transport of masseter-derived neprilysin to hippocampus. Arch Oral Biol 2020; 118:104861. [PMID: 32835988 DOI: 10.1016/j.archoralbio.2020.104861] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Revised: 07/25/2020] [Accepted: 07/31/2020] [Indexed: 10/23/2022]
Abstract
OBJECTIVE To show the possible occurrence of exosomal transport of neprilysin from masseter muscle to hippocampus via trigeminal nerve in the living mouse. DESIGN Mouse C2C12 myotube-derived exosomes were labeled with near-infrared (NIR) dye and injected into the masseter muscle to track their fluorescence from masseter muscle to hippocampus via trigeminal nerve. A plasmid vector encoding green fluorescent protein (GFP)-tagged neprilysin (GFP-neprilysin) was transfected into masseter muscle of C57BL/6 J mice. Expression of mRNA and encoded protein of the transgene was identified in masseter muscle, trigeminal nerve and hippocampus by RT-PCR and Western blot, respectively. RESULTS Peak of exosomal NIR in masseter muscle at time 0 rapidly reduced at 3 h and 6 h along with the subsequent increases in trigeminal nerve and hippocampus. Expression of GFP-neprilysin mRNA was detected in masseter muscle, but not trigeminal nerve and hippocampus. On the other hand, the corresponding protein of GFP-neprilysin was identified in the three tissues on day 3 after transfection into masseter muscle as a single band on Western blots with anti-GFP and anti-neprilysin antibodies. CONCLUSION The appearance of GFP-neprilysin protein in trigeminal nerve and hippocampus without a corresponding mRNA expression indicated the protein's origin from the masseter muscle. Concomitant migration of NIR-exosomes from masseter muscle to hippocampus via trigeminal nerve suggested the possible occurrence of exosomal transport of neprilysin.
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Affiliation(s)
- Yukinori Kuwajima
- Oral Medicine Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA
| | - Manavi S Nagai
- School of Dental Medicine, Boston University, Boston, MA, USA
| | - Cliff Lee
- Oral Medicine Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA
| | - Albert M Galaburda
- Department of Neurology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA
| | - Takuya Kobayashi
- Oral Medicine Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA
| | - Ayaka Nakasato
- Oral Medicine Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA
| | - John D Da Silva
- Restorative Dentistry and Biomaterial Sciences, Harvard School of Dental Medicine, Boston, MA, USA
| | - Shigemi Ishikawa Nagai
- Oral Medicine Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA
| | - Masazumi Nagai
- Oral Medicine Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA.
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Sabbah W, Slade GD, Sanders AE, Bernabé E. Denture wearing and mortality risk in edentulous American adults: A propensity score analysis. J Dent 2020; 100:103360. [PMID: 32404256 DOI: 10.1016/j.jdent.2020.103360] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 04/28/2020] [Accepted: 04/30/2020] [Indexed: 12/20/2022] Open
Abstract
OBJECTIVE To evaluate the association between complete denture use and subsequent mortality among edentulous adults. METHODS Data from 1649 edentulous adults who participated in the Third National Health and Nutritional Examination Survey were linked to public-use mortality files for the period up to December 2015. Denture wearing, defined as use of complete dentures in both arches (clinically inspected) all the time or only when awake, was compared to non-wearing, defined as use of dentures occasionally or not at all. The primary outcome was all-cause mortality. Data on 27 covariates, classified as sociodemographic characteristics, behavioral factors, health insurance, laboratory tests and general health status, were used to create propensity scores for weighted and matched analyses. RESULTS In weighted data, the difference in mortality rate between denture and non-denture wearers was 11.1 (95 %CI: 3.6-18.6) deaths per 1000 person-years and the number needed to treat (NNT) at 10 years was 12. Denture wearers had 15 % lower risk of death (HR: 0.85; 95 % CI: 0.73-0.98) than non-denture wearers. In the matched sample, the mortality rate difference between denture and non-denture wearers was 8.8 (95 %CI: 0.2-17.4) deaths per 1000 person-years and the NNT at 10 years was 11. Risk of death was 21 % lower among denture wearers (HR: 0.79; 95 % CI: 0.68, 0.92) than non-denture wearers. CONCLUSION This longitudinal analysis showed that the use of complete dentures was associated with longer survival and lower all-cause mortality risk among American edentulous adults. NNT is interpreted as one death prevented after 10 years for every twelve rehabilitated dentitions with removable complete dentures. CLINICAL SIGNIFICANCE Edentulous adults wearing complete dentures had longer survival and lower overall mortality risk than non-denture wearers, suggesting that prosthodontic rehabilitation with removable complete dentures might have benefits beyond restoring oral functioning.
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Affiliation(s)
- Wael Sabbah
- Dental Public Health Group, Faculty of Dentistry, Oral & Craniofacial Sciences, King's College London, London, United Kingdom
| | - Gary D Slade
- Division of Pediatric and Public Health, Adams School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States
| | - Anne E Sanders
- Division of Pediatric and Public Health, Adams School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States
| | - Eduardo Bernabé
- Dental Public Health Group, Faculty of Dentistry, Oral & Craniofacial Sciences, King's College London, London, United Kingdom.
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23
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Mandibular prognathism attenuates brain blood flow induced by chewing. Sci Rep 2019; 9:19104. [PMID: 31836754 PMCID: PMC6911081 DOI: 10.1038/s41598-019-55553-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Accepted: 11/28/2019] [Indexed: 11/30/2022] Open
Abstract
Mastication is closely related to brain function. Animal experiments have revealed that tooth loss has a negative influence on brain function. Clinical studies also suggest that normal occlusion is an essential factor for favorable brain function. Mandibular prognathism (MP) usually results in occlusal dysfunction. However, the relationship between MP and brain function remains unclear. In the present study, we examined the relationship between MP and brain function by measuring brain blood flow (BBF). Seventeen subjects with normal occlusion (NORM) and 25 patients with MP participated in this study. The number of occlusal contacts were counted. Electromyography of the masseter muscles during clenching was also recorded. BBF was measured with non-invasive functional near-infrared spectroscopy during calculation task and chewing task. The number of the occlusal contacts and masseter muscle activity were lower in MP compared with NORM. The calculation task increased BBF in both groups. The chewing task also increased BBF in the inferior frontal gyrus in both groups, although the increase in MP was smaller than in NORM. We discovered that patients with MP exhibited a smaller increase in BBF at the inferior frontal gyrus during chewing as compared with NORM. As such, MP would negatively affect brain function.
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24
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Chuhuaicura P, Dias FJ, Arias A, Lezcano MF, Fuentes R. Mastication as a protective factor of the cognitive decline in adults: A qualitative systematic review. Int Dent J 2019; 69:334-340. [DOI: 10.1111/idj.12486] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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25
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Weijenberg RAF, Delwel S, Ho BV, van der Maarel-Wierink CD, Lobbezoo F. Mind your teeth-The relationship between mastication and cognition. Gerodontology 2018; 36:2-7. [PMID: 30480331 PMCID: PMC7380285 DOI: 10.1111/ger.12380] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 10/08/2018] [Accepted: 10/20/2018] [Indexed: 12/22/2022]
Abstract
This article explores the multifactorial relationship between mastication and cognition, with a focus on dementia. Older persons, especially those with dementia, are at great risk of suffering from oral health problems such as orofacial pain and loss of natural teeth. A possible explanation could be that the cognitive and motor impairments resulting from dementia cause a decrease in self‐care and as such, a worsening of oral health. An alternative explanation is that cognition and oral health influence each other. Animal studies show that a decrease in masticatory activity, for example, due to a soft diet or loss of teeth, causes memory loss and neuronal degeneration. The relationship between mastication and cognition has also been researched in human studies, but a cause‐effect relationship has not been proven. It is likely that multiple factors play a role in this relationship, such as self‐care, nutrition, stress and pain.
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Affiliation(s)
- Roxane A F Weijenberg
- Oral Kinesiology, Academisch Centrum Tandheelkunde Amsterdam, Amsterdam, The Netherlands
| | - Suzanne Delwel
- Oral Kinesiology, Academisch Centrum Tandheelkunde Amsterdam, Amsterdam, The Netherlands.,Clinical Neuropsychology, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Bach Van Ho
- Oral Kinesiology, Academisch Centrum Tandheelkunde Amsterdam, Amsterdam, The Netherlands
| | | | - Frank Lobbezoo
- Oral Kinesiology, Academisch Centrum Tandheelkunde Amsterdam, Amsterdam, The Netherlands
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26
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Ikebe K, Gondo Y, Kamide K, Masui Y, Ishizaki T, Arai Y, Inagaki H, Nakagawa T, Kabayama M, Ryuno H, Okubo H, Takeshita H, Inomata C, Kurushima Y, Mihara Y, Hatta K, Fukutake M, Enoki K, Ogawa T, Matsuda KI, Sugimoto K, Oguro R, Takami Y, Itoh N, Takeya Y, Yamamoto K, Rakugi H, Murakami S, Kitamura M, Maeda Y. Occlusal force is correlated with cognitive function directly as well as indirectly via food intake in community-dwelling older Japanese: From the SONIC study. PLoS One 2018; 13:e0190741. [PMID: 29304177 PMCID: PMC5755890 DOI: 10.1371/journal.pone.0190741] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2017] [Accepted: 12/12/2017] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Growing evidence suggests that oral health may be an important factor associated with cognitive function in aged populations. However, many previous studies on this topic used insensitive oral indicators or did not include certain essential covariates. Thus, we examined the association between occlusal force and cognitive function in a large sample of older adults, controlling for dietary intake, vascular risk factors, inflammatory biomarkers, depression, and genetic factors. METHODS In this cross-sectional study of older community-dwelling Japanese adults, we examined data collected from 994 persons aged 70 years and 968 persons aged 80 years. Cognitive function was measured using the Japanese version of the Montreal Cognitive Assessment (MoCA-J). Oral status and function were evaluated according to the number of remaining teeth, periodontal pocket depth, and maximal occlusal force. Associations between MoCA-J scores and occlusal force were investigated via bivariate and multivariate analyses. RESULTS Education level, financial status, depression score, and intake of green and yellow vegetables, as well as number of teeth and occlusal force, were significantly correlated with MoCA-J scores in both age groups. Among individuals aged 80 years, CRP and periodontal status were weakly but significantly associated with MoCA-J score. After controlling for all significant variables via bivariate analyses, the correlation between maximal occlusal force and cognitive function persisted. A path analysis confirmed the hypothesis that cognitive function is associated with occlusal force directly as well as indirectly via food intake. CONCLUSIONS After controlling for possible factors, maximal occlusal force was positively associated with cognitive function directly as well as indirectly through dietary intake.
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Affiliation(s)
- Kazunori Ikebe
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Yasuyuki Gondo
- Department of Clinical Thanatology and Geriatric Behavioral Science, Osaka University Graduate School of Human Sciences, Osaka, Japan
| | - Kei Kamide
- School of Allied Health Sciences, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Yukie Masui
- Tokyo Metropolitan Institute of Gerontology, Research Team for Human Care, Tokyo, Japan
| | - Taturo Ishizaki
- Tokyo Metropolitan Institute of Gerontology, Research Team for Human Care, Tokyo, Japan
| | | | - Hiroki Inagaki
- Tokyo Metropolitan Institute of Gerontology, Research Team for Human Care, Tokyo, Japan
| | - Takeshi Nakagawa
- University of Zurich, University Research Priority Program "Dynamics of Healthy Aging", Zurich, Switzerland
| | - Mai Kabayama
- School of Allied Health Sciences, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Hirochika Ryuno
- School of Allied Health Sciences, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Hitomi Okubo
- Department of Health Promotion, National Institute of Public Health, Saitama, Japan
| | - Hajime Takeshita
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Chisato Inomata
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Yuko Kurushima
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Yusuke Mihara
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Kohdai Hatta
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Motoyoshi Fukutake
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Kaori Enoki
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Taiji Ogawa
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Ken-ichi Matsuda
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Ken Sugimoto
- Department of Geriatric and General Medicine, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Ryosuke Oguro
- Department of Geriatric and General Medicine, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Yoichi Takami
- Department of Geriatric and General Medicine, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Norihisa Itoh
- Department of Geriatric and General Medicine, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Yasushi Takeya
- Department of Geriatric and General Medicine, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Koichi Yamamoto
- Department of Geriatric and General Medicine, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Hiromi Rakugi
- Department of Geriatric and General Medicine, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Shinya Murakami
- Department of Periodontics, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Masahiro Kitamura
- Department of Periodontics, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Yoshinobu Maeda
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
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27
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Mutoh T, Sasaki K, Tatewaki Y, Kunitoki K, Takano Y, Taki Y. Preceding functional tooth loss delays recovery from acute cerebral hypoxia and locomotor hypoactivity after murine subarachnoid haemorrhage. Clin Exp Pharmacol Physiol 2017; 45:344-348. [PMID: 29044603 DOI: 10.1111/1440-1681.12874] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 09/30/2017] [Accepted: 10/03/2017] [Indexed: 01/04/2023]
Abstract
Tooth loss and related changes in the functionality may lead to worse outcome of stroke patients, but the effect on hemorrhagic stroke remains unclear. This study aimed to determine the impact of impaired masticatory function on acute cerebral oxygenation and locomotor activity after experimental subarachnoid haemorrhage (SAH). Twenty C57BL/6 mice with (MC-treated group) or without (control group) prior treatment of cutting off the upper molars were subjected to SAH by endovascular perforation. Grading of SAH and acute cerebral infarction were assessed by MR images. Brain tissue oxygen saturation (SbtO2 ) by photoacoustic imaging and parameters related to locomotor activity by open-field test were analyzed serially after SAH. In all mice, global SbtO2 depression was notable immediately after SAH induction (P <.001), which recovered close to the baseline levels until day 3. However, MC-treated mice demonstrated a prolonged relative cerebral hypoxia (<40% of the baseline SbtO2) as compared to the control (3 ± 1 vs 1 ± 1 days; P <.05). The average distance travelled on day 7 and the ratio of central-area distance/total travelled distance by open-field test between days 7 and 14 were significantly lower in MC-treated mice than in the control mice (P <.05), although the occurrences of new infarction were not statistically different (P >.05). These data suggest a possible link between preceding masticatory impairment and early brain injury to deteriorate neurobehavioural function in patients after SAH.
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Affiliation(s)
- Tatsushi Mutoh
- Institute of Development, Aging and Cancer (IDAC), Tohoku University, Sendai, Japan
| | - Kazumasu Sasaki
- Institute of Development, Aging and Cancer (IDAC), Tohoku University, Sendai, Japan
| | - Yasuko Tatewaki
- Institute of Development, Aging and Cancer (IDAC), Tohoku University, Sendai, Japan
| | - Keiko Kunitoki
- Institute of Development, Aging and Cancer (IDAC), Tohoku University, Sendai, Japan
| | - Yumi Takano
- Institute of Development, Aging and Cancer (IDAC), Tohoku University, Sendai, Japan
| | - Yasuyuki Taki
- Institute of Development, Aging and Cancer (IDAC), Tohoku University, Sendai, Japan
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28
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Williams H. The central nervous system pressure histogram in hydrocephalus and hydromyelia. Med Hypotheses 2017; 108:117-123. [DOI: 10.1016/j.mehy.2017.07.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2017] [Revised: 07/15/2017] [Accepted: 07/18/2017] [Indexed: 12/11/2022]
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29
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Tonsekar PP, Jiang SS, Yue G. Periodontal disease, tooth loss and dementia: Is there a link? A systematic review. Gerodontology 2017; 34:151-163. [DOI: 10.1111/ger.12261] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/03/2017] [Indexed: 11/29/2022]
Affiliation(s)
- Pallavi P. Tonsekar
- Department of Periodontics; Rutgers School of Dental Medicine; Newark NJ USA
| | - Shuying S. Jiang
- Institutional Assessment and Quality Improvement; Rutgers School of Dental Medicine; Newark NJ USA
| | - Gang Yue
- Department of Periodontics; Rutgers School of Dental Medicine; Newark NJ USA
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30
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Dudgeon W, Buchanan L, Strickland A, Scheett T, Garner D. Mouthpiece use during heavy resistance exercise affects serum cortisol and lactate. COGENT MEDICINE 2017. [DOI: 10.1080/2331205x.2017.1403728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Affiliation(s)
- W.D. Dudgeon
- Department of Health & Human Performance, College of Charleston, Charleston, SC, USA
| | - L.A. Buchanan
- Department of Health & Human Performance, College of Charleston, Charleston, SC, USA
| | - A.E. Strickland
- Department of Health, Exercise & Sport Science, The Citadel, Charleston, SC 29409, USA
| | - T.P. Scheett
- Department of Health, Exercise & Sport Science, The Citadel, Charleston, SC 29409, USA
| | - D.P. Garner
- Department of Health, Exercise & Sport Science, The Citadel, Charleston, SC 29409, USA
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31
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Gao W, Wang X, Wang X, Cai Y, Luan Q. Association of cognitive function with tooth loss and mitochondrial variation in adult subjects: a community-based study in Beijing, China. Oral Dis 2016; 22:697-702. [PMID: 27353124 DOI: 10.1111/odi.12529] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 06/12/2016] [Accepted: 06/21/2016] [Indexed: 12/31/2022]
Abstract
OBJECTIVES Cognitive impairment is a common neurological problem in elderly people. In this study, we investigated whether tooth loss, periodontal parameters, and gene variations in the mitochondrial DNA displacement loop region are potential influencing factors on cognitive function. DESIGN We employed a linear regression model to estimate cross-sectional association between number of teeth lost, periodontal parameters and Mini-mental State Examination score, adjusting for demographic factors, socioeconomic factors, general health status, smoking, drinking, and life habits. PARTICIPANTS A total of 905 Han Chinese people, ≥50 years of age, with complete data, were enrolled. Blood samples of 567 of the subjects were analyzed for correlation between mitochondrial DNA variants and Mini-mental State Examination score. RESULTS The number of teeth lost (β = -0.042, 95% CI: -0.061, -0.024, P < 0.001), two single nucleotide polymorphism (SNP) points: A189G (β = -1.540, 95% CI: -2.818, -0.263, P = 0.018) and A16164G (β = -1.053, 95% CI: -2.054, -0.052, P = 0.039) in the mitochondrial DNA displacement loop region, and haplogroup Y (β = -2.152, 95% CI: -4.062, -0.242, P = 0.027) were found to be negatively associated with Mini-mental State Examination scores in the fully adjusted model. No correlation was found between periodontal parameters and Mini-mental State Examination scores. CONCLUSION Number of teeth lost, mitochondrial SNPs, and haplogroup Y were correlated with cognitive function in this study population.
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Affiliation(s)
- W Gao
- Department of Periodontology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China
| | - X Wang
- Department of Periodontology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China
| | - X Wang
- Department of Genetics, Beijing Hypertension League Institute, Beijing, China
| | - Y Cai
- Department of Periodontology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China
| | - Q Luan
- Department of Periodontology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China.
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32
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Takeshita H, Ikebe K, Gondo Y, Inagaki H, Masui Y, Inomata C, Mihara Y, Uota M, Matsuda K, Kamide K, Takahashi R, Arai Y, Maeda Y. Association of Occlusal Force with Cognition in Independent Older Japanese People. JDR Clin Trans Res 2016; 1:69-76. [PMID: 30931693 DOI: 10.1177/2380084416636604] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Abstract
Recent longitudinal studies have shown the influence of multiple tooth loss on cognitive impairment, and earlier studies suggested that periodontal disease was related to cognitive decline. Tooth loss is associated with reduced masticatory function, which may affect stimulation of the central nervous system and dietary intake. Although some studies have reported a relationship between chewing ability and cognitive function, no studies have examined this area in terms of objective oral function. The aim of this study was to examine the association of occlusal force with cognitive decline in the preclinical stage among older people with higher-level functional capacity. This cross-sectional study for community-dwelling older people living in urban and rural areas in Japan examined 994 persons in the 70-y group (age range, 69–71 y) and 968 persons in the 80-y group (age range, 79–81 y). Retention of higher-level competence was defined according to the Tokyo Metropolitan Institute of Gerontology Index of Competence. Cognitive function was measured with the Japanese version of the Montreal Cognitive Assessment (MoCA-J). Oral status and function were assessed by the number of remaining teeth, periodontal pocket depth, and maximal occlusal force. Associations between the MoCA-J score and occlusal force were examined by bivariate and multivariate analysis. Approximately one-half of the participants retained higher-level functional capacity and were included in the analysis. Multiple regression analysis showed that occlusal force was significantly related to cognitive function after controlling for possible predictors including age, sex, socioeconomic status, medical condition, and handgrip strength. The number of remaining teeth and periodontal pocket depth were not significantly associated with cognitive function. Among community-dwelling older people with retained competence, maximal occlusal force was positively associated with their cognitive function. These results suggest that oral function might be a predictor for preclinical cognitive decline. Knowledge Transfer Statement: Multiple regression analysis showed that occlusal force was significantly related to cognition after controlling for possible predictors including handgrip strength as an indicator of general muscle strength, suggesting the independence of oral function. The number of remaining teeth did not have this association. The majority of older people have lost teeth and have received prosthodontic treatment, and their occlusal force is determined not only by the number of remaining teeth but also by prosthetic rehabilitation. These results can be used by clinicians focusing on prevention of tooth loss among the entire population, as well as to encourage partially edentulous and fully edentulous patients to restore their oral function with prostheses in order to eliminate a possible risk factor for cognitive impairment.
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Affiliation(s)
- H. Takeshita
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - K. Ikebe
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Y. Gondo
- Department of Clinical Thanatology and Geriatric Behavioral Science, Osaka University Graduate School of Human Sciences, Osaka, Japan
| | - H. Inagaki
- Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan
| | - Y. Masui
- Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan
| | - C. Inomata
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Y. Mihara
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - M. Uota
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - K. Matsuda
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - K. Kamide
- Osaka University Graduate School of Allied Health Sciences, Osaka, Japan
| | - R. Takahashi
- Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan
| | - Y. Arai
- Centre for Supercentenarian Research, Keio University School of Medicine, Tokyo, Japan
| | - Y. Maeda
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan
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33
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Douma JG, Volkers KM, Vuijk PJ, Scherder EJA. The effects of video observation of chewing during lunch on masticatory ability, food intake, cognition, activities of daily living, depression, and quality of life in older adults with dementia: a study protocol of an adjusted randomized controlled trial. BMC Geriatr 2016; 16:37. [PMID: 26846664 PMCID: PMC4743084 DOI: 10.1186/s12877-016-0205-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Accepted: 01/25/2016] [Indexed: 11/22/2022] Open
Abstract
Background Masticatory functioning alters with age. However, mastication has been found to be related to, for example, cognitive functioning, food intake, and some aspects of activities of daily living. Since cognitive functioning and activities of daily living show a decline in older adults with dementia, improving masticatory functioning may be of relevance to them. A possible way to improve mastication may be showing videos of people who are chewing. Observing chewing movements may activate the mirror neuron system, which becomes also activated during the execution of that same movement. The primary hypothesis is that the observation of chewing has a beneficial effect on masticatory functioning, or, more specifically, masticatory ability of older adults with dementia. Secondary, the intervention is hypothesized to have beneficial effects on food intake, cognition, activities of daily living, depression, and quality of life. Methods/Design An adjusted parallel randomized controlled trial is being performed in dining rooms of residential care settings. Older adults with dementia, for whom also additional eligibility criteria apply, are randomly assigned to the experimental (videos of chewing people) or control condition (videos of nature and buildings), by drawing folded pieces of paper. Participants who are able to watch each other’s videos are assigned to the same study condition. The intervention takes place during lunchtime, from Monday to Friday, for 3 months. During four moments of measurement, masticatory ability, food intake, cognitive functioning, activities of daily living, depression, and quality of life are assessed. Tests administrators blind to the group allocation administer the tests to participants. Discussion The goal of this study is to examine the effects of video observation of chewing on masticatory ability and several secondary outcome measures. In this study, the observation of chewing is added to the execution of the same action (i.e., during eating). Beneficial effects on masticatory ability, and consequently on the other outcome measures are hypothesized. The intervention may be easily integrated into daily care, and might add to the lives of the increasing number of older adults with dementia by beneficially influencing multiple daily life functions. Trial registration NTR5124. Registration date: 30 March 2015.
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Affiliation(s)
- Johanna G Douma
- Department of Clinical Neuropsychology, VU University, Van der Boechorststraat 1, 1081 BT, Amsterdam, The Netherlands.
| | - Karin M Volkers
- Department of Clinical Neuropsychology, VU University, Van der Boechorststraat 1, 1081 BT, Amsterdam, The Netherlands.
| | - Pieter Jelle Vuijk
- Department of Clinical Neuropsychology, VU University, Van der Boechorststraat 1, 1081 BT, Amsterdam, The Netherlands.
| | - Erik J A Scherder
- Department of Clinical Neuropsychology, VU University, Van der Boechorststraat 1, 1081 BT, Amsterdam, The Netherlands. .,University of Groningen, Center for Human Movement Sciences, Antonius Deusinglaan 1, 9713 AV, Groningen, The Netherlands.
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Nishigawa K, Suzuki Y, Matsuka Y. Masticatory performance alters stress relief effect of gum chewing. J Prosthodont Res 2015; 59:262-7. [PMID: 26342527 DOI: 10.1016/j.jpor.2015.07.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Revised: 07/27/2015] [Accepted: 07/29/2015] [Indexed: 11/19/2022]
Abstract
PURPOSE We evaluated the effects of gum chewing on the response to psychological stress induced by a calculation task and investigated the relationship between this response and masticatory performance. METHODS Nineteen healthy adult volunteers without dental problems undertook the Uchida-Kraepelin (UK) test (30 min of reiterating additions of one-digit numbers). Before and immediately after the test, saliva samples were collected from the sublingual area of the participants. Three min after the UK test, the participants were made to chew flavorless gum for 3 min, and the final saliva samples were collected 10 min after the UK test. The experiment was performed without gum chewing on a different day. Masticatory performance was evaluated using color-changing chewing gum. RESULTS Salivary CgA levels at immediately and 10 min after the UK test were compared with and without gum chewing condition. Two-way repeated measures analysis of variance revealed significant interaction between gum chewing condition and changes in CgA levels during post 10 min UK test period. A significant correlation was found between changes in CgA levels and masticatory performance in all participants. CONCLUSION Our results indicate that gum chewing may relieve stress responses; however, high masticatory performance is required to achieve this effect.
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Affiliation(s)
- Keisuke Nishigawa
- Department of Stomatognathic Function and Occlusal Reconstruction, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan.
| | - Yoshitaka Suzuki
- Department of Stomatognathic Function and Occlusal Reconstruction, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - Yoshizo Matsuka
- Department of Stomatognathic Function and Occlusal Reconstruction, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
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Schimmel M, Christou P, Miyazaki H, Halazonetis D, Herrmann FR, Müller F. A novel colourimetric technique to assess chewing function using two-coloured specimens: Validation and application. J Dent 2015; 43:955-64. [DOI: 10.1016/j.jdent.2015.06.003] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Revised: 05/28/2015] [Accepted: 06/11/2015] [Indexed: 10/23/2022] Open
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Garner DP, McDivitt EJ. Effects of Mouthpiece Use on Lactate and Cortisol Levels During and After 30 Minutes of Treadmill Running. ACTA ACUST UNITED AC 2015. [DOI: 10.11131/2015/101148] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- D. P. Garner
- The Citadel, Department of Health Exercise and Sports Science, 171 Moultrie Street, Charleston, SC 29409, USA
| | - E. J. McDivitt
- The Citadel, Department of Health Exercise and Sports Science, 171 Moultrie Street, Charleston, SC 29409, USA
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Weijenberg RAF, Lobbezoo F, Visscher CM, Scherder EJA. Oral mixing ability and cognition in elderly persons with dementia: A cross-sectional study. J Oral Rehabil 2015; 42:481-6. [DOI: 10.1111/joor.12283] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/31/2015] [Indexed: 12/16/2022]
Affiliation(s)
- R. A. F. Weijenberg
- Department of Clinical Neuropsychology; VU University Amsterdam; Amsterdam The Netherlands
| | - F. Lobbezoo
- Department of Oral Kinesiology; Academic Centre for Dentistry Amsterdam (ACTA); University of Amsterdam; Amsterdam The Netherlands
- MOVE Research Institute Amsterdam; VU University Amsterdam; Amsterdam The Netherlands
| | - C. M. Visscher
- Department of Oral Kinesiology; Academic Centre for Dentistry Amsterdam (ACTA); University of Amsterdam; Amsterdam The Netherlands
- MOVE Research Institute Amsterdam; VU University Amsterdam; Amsterdam The Netherlands
| | - E. J. A. Scherder
- Department of Clinical Neuropsychology; VU University Amsterdam; Amsterdam The Netherlands
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How masticatory function and periodontal disease relate to senile dementia. JAPANESE DENTAL SCIENCE REVIEW 2015. [DOI: 10.1016/j.jdsr.2014.09.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
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Tsuboi H, Hirai Y, Maezawa H, Notani K, Inoue N, Funahashi M. Effects of treadmill exercise on the LiCl-induced conditioned taste aversion in rats. Physiol Behav 2014; 138:1-5. [PMID: 25447753 DOI: 10.1016/j.physbeh.2014.10.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Revised: 10/17/2014] [Accepted: 10/20/2014] [Indexed: 10/24/2022]
Abstract
Studies have shown that exercise can enhance learning and memory. Conditioned taste aversion (CTA) is an avoidance behavior induced by associative memory of the taste sensation for something pleasant or neutral with a negative visceral reaction caused by the coincident action of a toxic substance that is tasteless or administered systemically. We sought to measure the effects of treadmill exercise on CTA in rats by investigating the effects of exercise on acquisition, extinction and spontaneous recovery of CTA. We made two groups of rats: an exercise group that ran on a treadmill, and a control group that did not have structured exercise periods. To condition rats to disfavor a sweet taste, consumption of a 0.1% saccharin solution in place of drinking water was paired with 0.15M LiCl (2% body weight, i.p.) to induce visceral discomfort. We measured changes of saccharin consumption during acquisition and extinction of CTA. The exercise and no-exercise groups both acquired CTA to similar levels and showed maximum extinction of CTA around 6 days after acquisition. This result indicates that exercise affects neither acquisition nor extinction of CTA. However, in testing for preservation of CTA after much longer extinction periods that included exercise or not during the intervening period, exercising animals showed a significantly lower saccharin intake, irrespective of having exercised or not during the conditioning phase of the trial. This result suggests that exercise may help to preserve aversive memory (taste aversion in this example) as evidence by the significant spontaneous recovery of aversion in exercising animals.
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Affiliation(s)
- Hisanori Tsuboi
- Department of Gerodontology, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan; Department of Oral Physiology, Division of Oral Functional Science, Hokkaido University Graduate School of Dental Medicine, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan.
| | - Yoshiyuki Hirai
- Department of Oral Physiology, Division of Oral Functional Science, Hokkaido University Graduate School of Dental Medicine, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan.
| | - Hitoshi Maezawa
- Department of Oral Physiology, Division of Oral Functional Science, Hokkaido University Graduate School of Dental Medicine, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan.
| | - Kenji Notani
- Department of Gerodontology, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan.
| | - Nobuo Inoue
- Department of Gerodontology, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan.
| | - Makoto Funahashi
- Department of Oral Physiology, Division of Oral Functional Science, Hokkaido University Graduate School of Dental Medicine, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan.
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Parasympathetic reflex vasodilation in the cerebral hemodynamics of rats. J Comp Physiol B 2014; 184:385-99. [PMID: 24504265 DOI: 10.1007/s00360-014-0807-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Revised: 01/16/2014] [Accepted: 01/21/2014] [Indexed: 10/25/2022]
Abstract
We investigated the role of parasympathetic reflex vasodilation in the regulation of the cerebral hemodynamics, and whether GABAA receptors modulate the response. We examined the effects of activation of the parasympathetic fibers through trigeminal afferent inputs on blood flow in the internal carotid artery (ICABF) and the cerebral blood vessels (rCBF) in parietal cortex in urethane-anesthetized rats. Electrical stimulation of the central cut end of the lingual nerve (LN) elicited intensity- and frequency-dependent increases in ICABF that were independent of changes in external carotid artery blood flow. Increases in ICABF were elicited by LN stimulation regardless of the presence or absence of sympathetic innervation. The ICABF increases evoked by LN stimulation were almost abolished by the intravenous administration of hexamethonium (10 mg kg(-1)) and were reduced significantly by atropine administration (0.1 mg kg(-1)). Although the LN stimulation alone had no significant effect on rCBF, LN stimulation in combination with a blocker of the GABAA receptor pentylenetetrazole increased the rCBF markedly. This increase in rCBF was reduced significantly by the administration of hexamethonium and atropine. These observations indicate that the increases in both ICABF and rCBF are evoked by parasympathetic activation via the trigeminal-mediated reflex. The rCBF increase evoked by LN stimulation is thought to be limited by the GABAA receptors in the central nervous system. These results suggest that the parasympathetic reflex vasodilation and its modulation mediated by GABA receptors within synaptic transmission in the brainstem are involved in the regulation of the cerebral hemodynamics during trigeminal afferent inputs.
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Monaco A, Cattaneo R, Mesin L, Fiorucci E, Pietropaoli D. Evaluation of autonomic nervous system in sleep apnea patients using pupillometry under occlusal stress: a pilot study. Cranio 2014; 32:139-47. [DOI: 10.1179/0886963413z.00000000022] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Miyake S, Takahashi SS, Yoshino F, Todoki K, Sasaguri K, Sato S, Lee MCI. Nitric oxide levels in rat hypothalamus are increased by restraint stress and decreased by biting. Redox Rep 2013; 13:31-9. [DOI: 10.1179/135100008x259132] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
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Hasegawa Y, Tachibana Y, Sakagami J, Zhang M, Urade M, Ono T. Flavor-Enhanced Modulation of Cerebral Blood Flow during Gum Chewing. PLoS One 2013; 8:e66313. [PMID: 23840440 PMCID: PMC3686860 DOI: 10.1371/journal.pone.0066313] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Accepted: 05/03/2013] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND Flavor perception, the integration of taste and odor, is a critical factor in eating behavior. It remains unclear how such sensory signals influence the human brain systems that execute the eating behavior. METHODS WE TESTED CEREBRAL BLOOD FLOW (CBF) IN THE FRONTAL LOBES BILATERALLY WHILE SUBJECTS CHEWED THREE TYPES OF GUM WITH DIFFERENT COMBINATIONS OF TASTE AND ODOR: no taste/no odor gum (C-gum), sweet taste/no odor gum (T-gum), and sweet taste/lemon odor gum (TO-gum). Simultaneous recordings of transcranial Doppler ultrasound (TCD) and near infrared spectrometer (NIRS) were used to measure CBF during gum chewing in 25 healthy volunteers. Bilateral masseter muscle activity was also monitored. RESULTS We found that subjects could discriminate the type of gum without prior information. Subjects rated the TO-gum as the most flavorful gum and the C-gum as the least flavorful. Analysis of masseter muscle activity indicated that masticatory motor output during gum chewing was not affected by taste and odor. The TCD/NIRS measurements revealed significantly higher hemodynamic signals when subjects chewed the TO-gum compared to when they chewed the C-gum and T-gum. CONCLUSIONS These data suggest that taste and odor can influence brain activation during chewing in sensory, cognitive, and motivational processes rather than in motor control.
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Affiliation(s)
- Yoko Hasegawa
- Department of Dentistry and Oral Surgery, Hyogo College of Medicine, Nishinomiya, Japan
- Division of Oromaxillofacial Regeneration, Course of Integrated Oral Science, Osaka University Graduate School of Dentistry, Suita, Japan
| | - Yoshihisa Tachibana
- Division of System Neurophysiology, National Institute for Physiological Sciences, Okazaki, Japan
| | - Joe Sakagami
- Division of Oromaxillofacial Regeneration, Course of Integrated Oral Science, Osaka University Graduate School of Dentistry, Suita, Japan
| | - Min Zhang
- Department of General Dentistry and Emergency, School of Stomatology, Fourth Military Medical University, Xi’an, China
| | - Masahiro Urade
- Department of Dentistry and Oral Surgery, Hyogo College of Medicine, Nishinomiya, Japan
| | - Takahiro Ono
- Division of Oromaxillofacial Regeneration, Course of Integrated Oral Science, Osaka University Graduate School of Dentistry, Suita, Japan
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Classification of Patients by the Function of Dentition, Postural, and Autonomic Nervous Systems. Bull Exp Biol Med 2012; 153:912-6. [DOI: 10.1007/s10517-012-1857-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Stress and chewing affect blood flow and oxygen levels in the rat brain. Arch Oral Biol 2012; 57:1491-7. [PMID: 23063255 DOI: 10.1016/j.archoralbio.2012.06.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Revised: 03/19/2012] [Accepted: 06/18/2012] [Indexed: 11/21/2022]
Abstract
OBJECTIVE Mastication, including chewing, would be of great importance not only for food intake, but also for the mental, physical and physiological functioning of the body. Our study showed that mastication, especially chewing, suppresses the stress response and was regarded as a biological response to defend against various stresses. Although mastication altered brain function during stress, the underlying mechanisms have not been elucidated. METHODS The effects of chewing during restraint stress on blood flow and oxygen partial pressure (PO(2)) levels in the rat amygdala and hypothalamus were measured using laser Doppler flowmetry and O(2)-selective electrodes. RESULTS Amygdaloidal and hypothalamic blood flow were not affected by restraint stress, but PO(2) levels were significantly reduced by restraint stress for 180 min compared to unrestrained control rats. The decrease in amygdaloidal and hypothalamic PO(2) levels during restraint stress was reduced after chewing for 30 min. CONCLUSION These results suggested that it is possible to evaluate hypothalamic and amygdaloidal blood flow and PO(2) levels in rat brains during restraint stress. Restraint stress reduced cerebral PO(2) levels. In addition, chewing would lead to increased blood flow and to recover cerebral PO(2) levels.
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Lexomboon D, Trulsson M, Wårdh I, Parker MG. Chewing Ability and Tooth Loss: Association with Cognitive Impairment in an Elderly Population Study. J Am Geriatr Soc 2012; 60:1951-6. [DOI: 10.1111/j.1532-5415.2012.04154.x] [Citation(s) in RCA: 123] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Mats Trulsson
- Department of Dental Medicine; Karolinska Institute; Hagalund; Sweden
| | - Inger Wårdh
- Department of Dental Medicine; Karolinska Institute; Hagalund; Sweden
| | - Marti G. Parker
- Aging Research Center; Karolinska Institute/Stockholm University; Karlstad; Sweden
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Monaco A, Cattaneo R, Mesin L, Ciarrocchi I, Sgolastra F, Pietropaoli D. Dysregulation of the autonomous nervous system in patients with temporomandibular disorder: a pupillometric study. PLoS One 2012; 7:e45424. [PMID: 23028999 PMCID: PMC3445536 DOI: 10.1371/journal.pone.0045424] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Accepted: 08/16/2012] [Indexed: 11/18/2022] Open
Abstract
The role of the autonomic nervous system (ANS) was recently investigated in Temporomandibular disorders (TMD). Several authors argue that in subjects with TMD there is a dysregulation of ANS. Recent literature support that Pupillometry is a simple non-invasive tool to study ANS. The aim of this study was to investigate the relationship between TMD and ANS activity using pupillometry recording in Infrared light at rest Mandible Position (RP); Infrared light at Forced Habitual Occlusion (FHO); Yellow-green light at RP; Yellow-green light at FHO. Forty female subjects were enrolled: 20 case patients showed TMD based on the Research Diagnostic Criteria for TMD, and 20 control patients, aged matched, had no signs or symptoms of TMD. Statistical analysis was performed on average pupil size. Ratio between pupil size in FHO and RP (FHO/RP ratio) and yellow-green and infrared (light/darkness ratio) lighting were carried out. Within group differences of pupil size and of “ratio” were analyzed using a paired t test, while differences of pupil size between groups were tested using an unpaired t test. Statistical comparisons between groups showed no significant differences of absolute values of pupil dimension in RP and FHO, both in yellow-green and in infrared lighting. In addition, there were no significant differences within groups comparing RP and FHO in yellow-green light. In within group comparison of pupil size, differences between RP and FHO were significant in infrared conditions. Control subjects increased, whereas TMD patients decreased pupil size at FHO in infrared lightening. FHO/RP ratio in darkness and light/darkness ratio in RP were significantly different between groups. Taken together, these data suggest that TMD subjects have an impairment of the sympathetic-adrenergic component of the ANS to be activated under stress. The present study provides preliminary pupillometric data confirming that adrenergic function is dysregulated in patients with TMD.
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Affiliation(s)
- Annalisa Monaco
- Department of Life, Health and Environmental Sciences, University of L’Aquila, L’Aquila, Italy
| | - Ruggero Cattaneo
- Department of Life, Health and Environmental Sciences, University of L’Aquila, L’Aquila, Italy
| | - Luca Mesin
- Department of Electronics and Telecommunications, Politecnico di Torino, Torino, Italy
| | - Irma Ciarrocchi
- Department of Life, Health and Environmental Sciences, University of L’Aquila, L’Aquila, Italy
| | - Fabrizio Sgolastra
- Department of Life, Health and Environmental Sciences, University of L’Aquila, L’Aquila, Italy
| | - Davide Pietropaoli
- Department of Life, Health and Environmental Sciences, University of L’Aquila, L’Aquila, Italy
- * E-mail:
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Zhang M, Hasegawa Y, Sakagami J, Ono T, Hori K, Maeda Y, Chen YJ. Effects of unilateral jaw clenching on cerebral/systemic circulation and related autonomic nerve activity. Physiol Behav 2012; 105:292-7. [DOI: 10.1016/j.physbeh.2011.07.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2011] [Revised: 07/26/2011] [Accepted: 07/27/2011] [Indexed: 10/17/2022]
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Iida T, Sakayanagi M, Svensson P, Komiyama O, Hirayama T, Kaneda T, Sakatani K, Kawara M. Influence of periodontal afferent inputs for human cerebral blood oxygenation during jaw movements. Exp Brain Res 2011; 216:375-84. [DOI: 10.1007/s00221-011-2941-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2011] [Accepted: 11/04/2011] [Indexed: 11/30/2022]
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Soeda R, Tasaka A, Sakurai K. Influence of chewing force on salivary stress markers as indicator of mental stress. J Oral Rehabil 2011; 39:261-9. [PMID: 22040229 DOI: 10.1111/j.1365-2842.2011.02264.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The aim of this study was to investigate the influence of chewing force on salivary stress markers (alpha-amylase activity, salivary cortisol level and secretory immunoglobulin A secretion rate) as indicators of mental stress. Participants comprised 20 healthy men. The first set of saliva specimens (S1) was collected at immediately after a 20-min rest to evaluate stress markers. As stress loading, the participants were required to perform arithmetic calculations for 20 min, after which the second set of saliva specimens (S2) was collected. Each participant was then required to chew a piece of tasteless gum for 10 min, after which the third set of saliva specimens (S3) was collected. After a 20-min rest, the fourth set of saliva specimens (S4) was collected. Weak, habitual and strong chewing forces were assigned. Change rates of stress markers between S2 and S3, and S2 and S4 were calculated. A significant difference was observed in the change rate of cortisol levels between S2 and S3. Cortisol level decreased more under strong chewing than under weak chewing. No significant differences were observed in the change rate of amylase activity or s-IgA secretion rate among the three chewing forces. The results suggest that differences in chewing force influence the salivary cortisol level of the three stress markers, and that a strong chewing force induces a greater reduction in mental stress than a weak one.
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Affiliation(s)
- R Soeda
- Department of Removable Prosthodontics and Gerodontology, Tokyo Dental College, Chiba, Japan.
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