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Costa RTF, de Oliveira Limirio JPJ, Vasconcelos BCDE, Pellizzer EP, Moraes SLDD. Rehabilitation with dental prostheses and its influence on brain activity: A systematic review. J Prosthet Dent 2024; 131:403-409. [PMID: 35305835 DOI: 10.1016/j.prosdent.2022.02.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 02/12/2022] [Accepted: 02/14/2022] [Indexed: 11/29/2022]
Abstract
STATEMENT OF PROBLEM The consequences of edentulism depend on its complexity and are far-reaching, but limited evidence regarding its association with neurologic health is available. PURPOSE The purpose of this systematic review was to establish the relationship between oral prosthetic rehabilitation and the regional increase in brain activity. MATERIAL AND METHODS This systematic review was registered in the International Prospective Register of Systematic Reviews (CRD42021262247), and the Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) guideline was followed. Randomized clinical trials, prospective studies comparing the brain activity of patients rehabilitated with and without the use of dental prostheses, and studies that analyzed the human brain by using noninvasive techniques were used as inclusion criteria. The risk of bias in each study was assessed by using the Risk Of Bias In Non-randomized Studies-of Interventions (ROBINS-I). RESULTS The search was carried out in the PubMed/MEDLINE, Embase, Cochrane Library, and https://clinicaltrials.gov databases up to June 2021. After a search conducted by 2 reviewers, 8 articles were included in the review. A regional increase in blood flow and regional cerebral activity during dental prosthesis use was identified in the studies. CONCLUSIONS A positive association was found between the different types of prosthetic rehabilitation and brain function. Prostheses may preserve and restore neurological health.
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Affiliation(s)
| | | | | | - Eduardo Piza Pellizzer
- Full Professor, Department of Dental Materials and Prosthodontics, Araçatuba Dental School, São Paulo State University (UNESP), Araçatuba, Brazil.
| | - Sandra Lúcia Dantas de Moraes
- Associate Professor, Division of Oral Rehabilitation, Faculty of Dentistry, University of Pernambuco (UPE), Recife, Brazil
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Hedberg L, Kumar A, Skott P, Smedberg JI, Seiger Å, Sandborgh-Englund G, Nordin LE, Kåreholt I, Tzortzakakis A, Westman E, Trulsson M, Ekman U. White matter abnormalities mediate the association between masticatory dysfunction and cognition among older adults. J Oral Rehabil 2023; 50:1422-1431. [PMID: 37710915 DOI: 10.1111/joor.13584] [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: 09/24/2022] [Revised: 06/30/2023] [Accepted: 08/17/2023] [Indexed: 09/16/2023]
Abstract
BACKGROUND Masticatory parameters, such as reduced number of teeth and posterior contacts, have been shown to be associated with reduced cognitive status. The underlying mechanisms that affect these associations, are however, not well understood. OBJECTIVES The study aims to investigate the association between masticatory dysfunction and cognition and explore the mediating effect of brain structure. METHODS In this cross-sectional study, 45 older adults with subjective masticatory dysfunction (mean age 72.3 ± 4.0 years) were included. Mini-Mental State Examination score <25, brain trauma, neurological disease, neurodegenerative disorders, depression or poor Swedish language skills were criteria for exclusion. Cognitive functions (executive function and episodic memory) and masticatory dysfunction defined by functional occluding status (FOS; the number of occluding units and number of remaining teeth) were analysed with partial correlation models. Structural magnetic resonance imaging was performed on 28 feasible participants. Multiple regression analyses were performed to evaluate the predictive value of brain structure and white matter hypointensities (WM-hypo) on cognitive functions. A mediation analysis was applied to assess significant predictor/s of the association between FOS and cognition. RESULTS Both episodic memory and executive functions were positively correlated with FOS. WM-hypo predicted cognitive status (executive function, p ≤ .01). WM-hypo mediated 66.6% (p = 0.06) of the association between FOS and executive functions. CONCLUSION Associations between FOS and cognitive functions are reported, where FOS, a potential modifiable risk factor, was related to both episodic memory and executive functions. The mediating effect of WM-hypo on the association between FOS and executive functions highlights the impact of the vascularisation of the brain on the link between mastication and cognition. The present study provides increased knowledge that bridges the gap between masticatory dysfunction and cognition.
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Affiliation(s)
- Linn Hedberg
- Folktandvården Eastmaninstitutet, Stockholm, Sweden
- Department of Dental Medicine, Karolinska Institutet, Stockholm, Sweden
- Academic Centre for Geriatric Dentistry, Stockholm, Sweden
| | - Abhishek Kumar
- Department of Dental Medicine, Karolinska Institutet, Stockholm, Sweden
- Academic Centre for Geriatric Dentistry, Stockholm, Sweden
| | - Pia Skott
- Folktandvården Eastmaninstitutet, Stockholm, Sweden
- Department of Dental Medicine, Karolinska Institutet, Stockholm, Sweden
- Academic Centre for Geriatric Dentistry, Stockholm, Sweden
| | - Jan-Ivan Smedberg
- Folktandvården Eastmaninstitutet, Stockholm, Sweden
- Department of Dental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Åke Seiger
- Academic Centre for Geriatric Dentistry, Stockholm, Sweden
- Division of Clinical Geriatrics, Department of Neurobiology, Care Sciences and Society (NVS), Karolinska Institutet, Stockholm, Sweden
| | - Gunilla Sandborgh-Englund
- Department of Dental Medicine, Karolinska Institutet, Stockholm, Sweden
- Academic Centre for Geriatric Dentistry, Stockholm, Sweden
| | - Love Engström Nordin
- Division of Clinical Geriatrics, Department of Neurobiology, Care Sciences and Society (NVS), Karolinska Institutet, Stockholm, Sweden
- Department of Diagnostic Medical Physics, Karolinska University Hospital, Stockholm, Sweden
| | - Ingemar Kåreholt
- Aging Research Center, Karolinska Institutet and Stockholm University, Stockholm, Sweden
- School of Health and Welfare, Jönköping University, Jönköping, Sweden
| | - Antonios Tzortzakakis
- Department of Medical Radiation Physics and Nuclear Medicine, Karolinska University Hospital, Stockholm, Sweden
| | - Eric Westman
- Division of Clinical Geriatrics, Department of Neurobiology, Care Sciences and Society (NVS), Karolinska Institutet, Stockholm, Sweden
- Department of Neuroimaging, Centre for Neuroimaging Sciences, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Mats Trulsson
- Department of Dental Medicine, Karolinska Institutet, Stockholm, Sweden
- Academic Centre for Geriatric Dentistry, Stockholm, Sweden
| | - Urban Ekman
- Division of Clinical Geriatrics, Department of Neurobiology, Care Sciences and Society (NVS), Karolinska Institutet, Stockholm, Sweden
- Women's Health and Allied Health Professionals Theme, Medical Unit, Medical Psychology, Karolinska University Hospital, Stockholm, Sweden
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Anitua E, Eguia A, Alkhraisat MH. Extra-short implants (≤ 6.5 mm in length) in atrophic and non-atrophic sites to support screw-retained full-arch restoration: a retrospective clinical study. Int J Implant Dent 2023; 9:29. [PMID: 37702800 PMCID: PMC10499764 DOI: 10.1186/s40729-023-00499-7] [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: 05/26/2023] [Accepted: 09/05/2023] [Indexed: 09/14/2023] Open
Abstract
PURPOSE Increasing scientific evidence support extending the application of short dental implants to non-atrophic dental arches. The purpose of this study has been the evaluation of extra-short implants (≤ 6.5 mm in length) that were placed in atrophic and non-atrophic anatomical sites to support the same prosthesis. METHODS For that, a retrospective study was conducted by including complete dentures that were solely supported by extra-short implants in the maxilla and/or the mandible. Clinical data about patients, implants, anatomy, and prosthesis were obtained. Statistical analysis was performed to assess implant- and prosthesis-survival, changes in the marginal bone level and prosthetic complications. RESULTS A total of 87 implants in 15 screw-retained complete dentures were assessed. None of the prostheses nor the extra-short implant failed during the follow-up of 27.2 ± 15.4 months. The changes in the mesial and distal marginal bone level were + 0.15 ± 0.51 mm and + 0.11 ± 0.50 mm, respectively. Comparing the implants according to the availability of sufficient bone to place longer implants, indicated the absence of significant differences in the changes of the mesial marginal bone level. However, the changes in the distal marginal bone level showed a statistically significant difference in favor of implants that were placed in non-atrophic sites. Two events of screw loosening were reported that were resolved by retightening the screws. CONCLUSIONS Implant- and prosthesis-related outcomes support the use of extra-short implants in atrophic and non-atrophic site to support complete prosthesis.
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Affiliation(s)
- Eduardo Anitua
- Private Practice in Oral Implantology, Clínica Eduardo Anitua Foundation, C/ Jose Maria Cagigal 19, 01007, Vitoria, Spain.
- University Institute for Regenerative Medicine and Oral Implantology, UIRMI (UPV/EHU-Fundación Eduardo Anitua), Vitoria, Spain.
- BTI Biotechnology Institute, Vitoria, Spain.
| | - Asier Eguia
- University Institute for Regenerative Medicine and Oral Implantology, UIRMI (UPV/EHU-Fundación Eduardo Anitua), Vitoria, Spain
- University of the Basque Country UPV/EHU, Leioa (Bizkaia), Spain
| | - Mohammad Hamdan Alkhraisat
- University Institute for Regenerative Medicine and Oral Implantology, UIRMI (UPV/EHU-Fundación Eduardo Anitua), Vitoria, Spain
- BTI Biotechnology Institute, Vitoria, Spain
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Lee YJ, Lim C, Lim S, Cho S. Tooth-Cutting-Induced Maxillary Malocclusion Exacerbates Cognitive Deficit in a Mouse Model of Vascular Dementia. Brain Sci 2023; 13:brainsci13050781. [PMID: 37239252 DOI: 10.3390/brainsci13050781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 05/04/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023] Open
Abstract
Treatments to restore the balance of the temporomandibular joint (TMJ) are performed in the field of complementary and alternative medicine; however, evidence supporting this approach remains weak. Therefore, this study attempted to establish such evidence. Bilateral common carotid artery stenosis (BCAS) operation, which is commonly used for the establishment of a mouse model of vascular dementia, was performed, followed by tooth cutting (TEX) for maxillary malocclusion to promote the imbalance of the TMJ. Behavioural changes, changes in nerve cells and changes in gene expression were assessed in these mice. The TEX-induced imbalance of the TMJ caused a more severe cognitive deficit in mice with BCAS, as indicated by behavioural changes in the Y-maze test and novel object recognition test. Moreover, inflammatory responses were induced via astrocyte activation in the hippocampal region of the brain, and the proteins involved in inflammatory responses were found to be involved in these changes. These results indirectly show that therapies that restore the balance of the TMJ can be effectively used for the management of cognitive-deficit-related brain diseases associated with inflammation.
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Affiliation(s)
- Young-Jun Lee
- Lee Young Jun Clinic of Korean Medicine, Institute of TMJ Integrative Medicine, Cheonan 31141, Republic of Korea
| | - Chiyeon Lim
- Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02129, USA
- College of Medicine, Dongguk University, Goyang 10326, Republic of Korea
| | - Sehyun Lim
- Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02129, USA
- School of Public Health, Far East University, Eumseong 27601, Republic of Korea
| | - Suin Cho
- School of Korean Medicine, Pusan National University, Yangsan 50612, Republic of Korea
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Al-Manei K, Jia L, Al-Manei KK, Ndanshau EL, Grigoriadis A, Kumar A. Food Hardness Modulates Behavior, Cognition, and Brain Activation: A Systematic Review of Animal and Human Studies. Nutrients 2023; 15:nu15051168. [PMID: 36904167 PMCID: PMC10005610 DOI: 10.3390/nu15051168] [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: 01/31/2023] [Revised: 02/22/2023] [Accepted: 02/23/2023] [Indexed: 03/02/2023] Open
Abstract
Food hardness is one of the dietary features that may impact brain functions. We performed a systematic review to evaluate the effect of food hardness (hard food versus soft food diet) on behavior, cognition, and brain activation in animals and humans (PROSPERO ID: CRD42021254204). The search was conducted on 29 June 2022 using Medline (Ovid), Embase, and Web of Science databases. Data were extracted, tabulated by food hardness as an intervention, and summarized by qualitative synthesis. The SYRCLE and JBI tools were used to assess the risk of bias (RoB) of individual studies. Of the 5427 studies identified, 18 animal studies and 6 human studies met the inclusion criteria and were included. The RoB assessment indicated that 61% of animal studies had unclear risks, 11% had moderate risks, and 28% had low risks. All human studies were deemed to have a low risk of bias. The majority (48%) of the animal studies showed that a hard food diet improved behavioral task performance compared to soft food diets (8%). However, 44% of studies also showed no differential effects of food hardness on behavioral tests. It was also evident that certain regions of the brain were activated in response to changes in food hardness in humans, with a positive association between chewing hard food, cognition performance, and brain function. However, variations in the methodologies of the included studies hindered the meta-analysis execution. In conclusion, our findings highlight the beneficial effects of dietary food hardness on behavior, cognition, and brain function in both animals and humans, however, this effect may depend on several factors that require further understanding of the causality.
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Affiliation(s)
- Khaled Al-Manei
- Division of Oral Diagnostics and Rehabilitation, Department of Dental Medicine, Karolinska Institutet, 141 04 Huddinge, Sweden
- Division of Endodontics, Department of Restorative Dental Science, College of Dentistry, King Saud University, Riyadh 11545, Saudi Arabia
| | - Leming Jia
- Division of Oral Diagnostics and Rehabilitation, Department of Dental Medicine, Karolinska Institutet, 141 04 Huddinge, Sweden
| | - Kholod Khalil Al-Manei
- Division of Endodontics, Department of Restorative Dental Science, College of Dentistry, King Saud University, Riyadh 11545, Saudi Arabia
| | | | - Anastasios Grigoriadis
- Division of Oral Diagnostics and Rehabilitation, Department of Dental Medicine, Karolinska Institutet, 141 04 Huddinge, Sweden
| | - Abhishek Kumar
- Division of Oral Diagnostics and Rehabilitation, Department of Dental Medicine, Karolinska Institutet, 141 04 Huddinge, Sweden
- Academic Center for Geriatric Dentistry, 112 19 Stockholm, Sweden
- Correspondence:
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Wieczorek T, Michałek-Zrąbkowska M, Więckiewicz M, Mazur G, Rymaszewska J, Smardz J, Wojakowska A, Martynowicz H. Sleep Bruxism Contributes to Motor Activity Increase during Sleep in Apneic and Nonapneic Patients-A Polysomnographic Study. Biomedicines 2022; 10:biomedicines10102666. [PMID: 36289928 PMCID: PMC9599859 DOI: 10.3390/biomedicines10102666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 10/15/2022] [Accepted: 10/17/2022] [Indexed: 11/20/2022] Open
Abstract
Background: Jaw motor activity (MA) in sleep bruxism (SB) has been demonstrated to accompany lower limb movements. However, it remains unknown whether SB activity coexists with other types of movements and what the possible underlying mechanisms of such temporal coexistence are. In obstructive sleep apnea (OSA), increased movement activity is also reported, including SB activity; however, no studies have compared MA in apneic and nonapneic SB patients. Aim: This cross-sectional study focused on the phenomenon of “big body movements” in patients with either SB or OSA (or both) and intended to identify the primary factors contributing to their appearance, using polysomnography (PSG) recording. Methods: A whole-night videoPSG was carried out in 287 participants, and 124 apneic and 146 nonapneic participants were selected for the study. In both groups, participants were further divided into no SB, moderate SB, and severe SB (SSB) subgroups based on their bruxism episode index (BEI). MA was recorded using a built-in sensor of the central PSG unit located on the participant’s chest during the examination. Results: The presence of SB was related to the higher intensity of MA in both apneic and nonapneic participants, though in general the MA level was higher in apneic participants, with the highest level observed in SSB apneic participants. Conclusions: SB might contribute to MA. The prevalence of SB might be higher in nonapneic patients due to phasic and mixed SB activity, whereas the SB phenotype seems to be less relevant in apneic patients. SB activity is likely to increase MA in non-REM 1 sleep.
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Affiliation(s)
- Tomasz Wieczorek
- Department and Clinic of Psychiatry, Wroclaw Medical University, 50-367 Wroclaw, Poland
- Correspondence:
| | - Monika Michałek-Zrąbkowska
- Department and Clinic of Internal Medicine, Occupational Diseases, Hypertension and Clinical Oncology, Wroclaw Medical University, 50-367 Wroclaw, Poland
| | - Mieszko Więckiewicz
- Department of Experimental Dentistry, Wroclaw Medical University, 50-367 Wroclaw, Poland
| | - Grzegorz Mazur
- Department and Clinic of Internal Medicine, Occupational Diseases, Hypertension and Clinical Oncology, Wroclaw Medical University, 50-367 Wroclaw, Poland
| | - Joanna Rymaszewska
- Department and Clinic of Psychiatry, Wroclaw Medical University, 50-367 Wroclaw, Poland
| | - Joanna Smardz
- Department of Experimental Dentistry, Wroclaw Medical University, 50-367 Wroclaw, Poland
| | - Anna Wojakowska
- Department and Clinic of Internal Medicine, Occupational Diseases, Hypertension and Clinical Oncology, Wroclaw Medical University, 50-367 Wroclaw, Poland
| | - Helena Martynowicz
- Department and Clinic of Internal Medicine, Occupational Diseases, Hypertension and Clinical Oncology, Wroclaw Medical University, 50-367 Wroclaw, Poland
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Silva Ulloa S, Cordero Ordóñez AL, Barzallo Sardi VE. Relationship between dental occlusion and brain activity: A narrative review. Saudi Dent J 2022; 34:538-543. [PMID: 36267531 PMCID: PMC9577336 DOI: 10.1016/j.sdentj.2022.09.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 09/07/2022] [Accepted: 09/12/2022] [Indexed: 11/20/2022] Open
Abstract
Objectives Occlusal function stimulates different areas of the cerebral cortex. The purpose of this narrative review was to identify the relationship between occlusion and brain activity so as to provide theoretical support to enable future studies on the subject. Study selection, data, and sources Relevant case-control studies, clinical trials, and systematic reviews available in English were retrieved from the following databases: MEDLINE, PubMed, ScienceDirect, Wiley Online Library, and Biblioteca Virtual en Salud (BVS). Of the 53 articles obtained, 12 were included. Conclusion The sensorimotor cortex is affected by changes in occlusion. It is speculated that occlusion could play an important role in the development of diseases, from anxiety and stress to Alzheimer’s disease and senile dementia. Further investigations into the interactions between occlusion and brain function are needed to elucidate the parts of the brain that are affected when occlusion is disturbed and to determine whether brain function is altered. Clinical significance Dentists must consider that alterations in the occlusal pattern during mastication can lead to changes in the activation of different brain regions related to memory, learning, anticipatory pain, and anxiety. This suggests that mastication maintains the integrity of certain brain areas and that it may be a key factor in the onset of neurodegenerative diseases.
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Affiliation(s)
- Sebastian Silva Ulloa
- Student of the Department of Orthodontics, Faculty of Dentistry, Universidad de Cuenca, Cuenca 010204, Ecuador
- Corresponding author at: Facultad de Odontología, Universidad de Cuenca, Pasaje del, Paraíso y Avenida 10 de agosto, Cuenca 010204, Ecuador.
| | - Ana Lucía Cordero Ordóñez
- Student of the Department of Orthodontics, Faculty of Dentistry, Universidad de Cuenca, Cuenca 010204, Ecuador
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Elias A, Raza FB, Vaidyanathan AK, Thallam Veeravalli P. Influence of dental magnets on human brain activity: A quantitative EEG analysis. SPECIAL CARE IN DENTISTRY 2021; 42:105-111. [PMID: 34553779 DOI: 10.1111/scd.12651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 08/31/2021] [Accepted: 09/03/2021] [Indexed: 11/28/2022]
Abstract
PURPOSE The magnetic field is known to attenuate mental depression, but it is not clear on the effect of dental magnets on human brain activity. Therefore, this study was to determine the influence of magnetic field from intraoral magnets on the human brain activity by analyzing the changes in alpha waves. MATERIALS AND METHODS Twenty complete denture male patients aged between 50 and 60 years were included after their consent. The neodymium-iron-boron sintered magnet was incorporated into the existing mandibular denture bilaterally in canine region. The participants were subjected to electroencephalogram (EEG) and the output measured alpha waves at three phases: (i) without placement of magnets (WM0), (ii) 30 days post-magnet placement in the mandibular denture (WM), and (iii) after 6 months post-removal of magnets (WM6). The data obtained was skewed (non-parametric), and hence multivariate analysis using Friedman test, and bivariate analysis using Wilcoxon signed rank test and Mann-Whitney test were done to assess the significant difference among the groups. RESULTS The comparison of alpha waves between different phases showed a significant difference in all the pairs (p < .05) except WM-WM6. Comparison of alpha waves between right and left hemisphere showed no statistically significant difference (p > .05). CONCLUSION We concluded that dental magnets had an influential effect on the alpha waves in the brain on both the left and right hemispheres. The removal of dental magnets retained the changes in brain activity even after 6 months of removal, denoting the alternative therapy to management of mental depression.
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Affiliation(s)
- Angel Elias
- Department of Prosthodontics, Faculty of Dental Sciences, Sri Ramachandra Institute of Higher Education and Research, Porur, Tamil Nadu, India
| | - Fathima Banu Raza
- Department of Prosthodontics, Faculty of Dental Sciences, Sri Ramachandra Institute of Higher Education and Research, Porur, Tamil Nadu, India
| | - Anand Kumar Vaidyanathan
- Department of Prosthodontics, Faculty of Dental Sciences, Sri Ramachandra Institute of Higher Education and Research, Porur, Tamil Nadu, India
| | - Padmanabhan Thallam Veeravalli
- Department of Prosthodontics, Faculty of Dental Sciences, Sri Ramachandra Institute of Higher Education and Research, Porur, Tamil Nadu, India
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Hedberg L, Ekman U, Nordin LE, Smedberg JI, Skott P, Seiger Å, Sandborgh-Englund G, Westman E, Kumar A, Trulsson M. Cognitive changes and neural correlates after oral rehabilitation procedures in older adults: a protocol for an interventional study. BMC Oral Health 2021; 21:297. [PMID: 34107933 PMCID: PMC8191046 DOI: 10.1186/s12903-021-01654-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 06/03/2021] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Epidemiological studies show an association between masticatory function and cognitive impairment. This has further strengthened the notion that tooth loss and impaired masticatory function may be risk factors for dementia and cognitive decline. Animal experiments have indicated a causal relationship and several possible mechanisms have been discussed. This evidence is, however, lacking in humans. Therefore, in the current interventional study, we aim to investigate the effect of rehabilitation of masticatory function on cognition in older adults. METHODS Eighty patients indicated for prosthodontic rehabilitation will be randomly assigned to an experimental or a control group. Participants will conduct neuropsychological assessments, masticatory performance tests, saliva tests, optional magnetic resonance imaging, and answer questionnaires on oral health impact profiles and hospital anxiety and depression scale before, 3 months, and 1 year after oral rehabilitation. The difference between the two groups is that the control group will be tested an additional time, (at an interval of about 3 months) before the onset of the oral rehabilitation procedure. The primary outcome is a change in measures of episodic memory performance. DISCUSSION Although tooth loss and masticatory function are widespread in older people, it is still an underexplored modifiable risk factor potentially contributing to the development of cognitive impairment. If rehabilitation of masticatory function shows positive effects on the neurocognitive function, this will have great implications on future health care for patients with impaired masticatory status. The present project may provide a new avenue for the prevention of cognitive decline in older individuals. TRIAL REGISTRATION The protocol for the study was retrospectively registered in ClinicalTrials.gov Identifier: NCT04458207, dated 02-07-2020.
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Affiliation(s)
- Linn Hedberg
- Folktandvården Eastmaninstitutet, Stockholm, Sweden
- Division of Oral Diagnostics and Rehabilitation, Department of Dental Medicine, Karolinska Institutet, Alfred Nobels Allé 8, Box 4064, 141 04, Huddinge, Sweden
| | - Urban Ekman
- Division of Clinical Geriatrics, Department of Neurobiology, Care Sciences and Society (NVS), Karolinska Institutet, Huddinge, Sweden
| | - Love Engström Nordin
- Division of Clinical Geriatrics, Department of Neurobiology, Care Sciences and Society (NVS), Karolinska Institutet, Huddinge, Sweden
- Department of Diagnostic Medical Physics, Karolinska University Hospital, Solna, Stockholm, Sweden
| | - Jan-Ivan Smedberg
- Folktandvården Eastmaninstitutet, Stockholm, Sweden
- Division of Oral Diagnostics and Rehabilitation, Department of Dental Medicine, Karolinska Institutet, Alfred Nobels Allé 8, Box 4064, 141 04, Huddinge, Sweden
| | - Pia Skott
- Folktandvården Eastmaninstitutet, Stockholm, Sweden
- Academic Centre for Geriatric Dentistry, Stockholm, Sweden
| | - Åke Seiger
- Division of Clinical Geriatrics, Department of Neurobiology, Care Sciences and Society (NVS), Karolinska Institutet, Huddinge, Sweden
- Academic Centre for Geriatric Dentistry, Stockholm, Sweden
| | - Gunilla Sandborgh-Englund
- Division of Oral Diagnostics and Rehabilitation, Department of Dental Medicine, Karolinska Institutet, Alfred Nobels Allé 8, Box 4064, 141 04, Huddinge, Sweden
- Academic Centre for Geriatric Dentistry, Stockholm, Sweden
| | - Eric Westman
- Division of Clinical Geriatrics, Department of Neurobiology, Care Sciences and Society (NVS), Karolinska Institutet, Huddinge, Sweden
| | - Abhishek Kumar
- Division of Oral Diagnostics and Rehabilitation, Department of Dental Medicine, Karolinska Institutet, Alfred Nobels Allé 8, Box 4064, 141 04, Huddinge, Sweden.
| | - Mats Trulsson
- Division of Oral Diagnostics and Rehabilitation, Department of Dental Medicine, Karolinska Institutet, Alfred Nobels Allé 8, Box 4064, 141 04, Huddinge, Sweden
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Clinical Outcome of Dental Implants after Maxillary Sinus Augmentation with and without Bone Grafting: A Retrospective Evaluation. MATERIALS 2021; 14:ma14102479. [PMID: 34064784 PMCID: PMC8151007 DOI: 10.3390/ma14102479] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 04/28/2021] [Accepted: 05/06/2021] [Indexed: 12/21/2022]
Abstract
(1) Background: The purpose of the present study was to retrospectively evaluate and compare the outcome of two sinus augmentation grafting protocols using a xenograft or blood clot alone over a 72-month follow-up. (2) Methods: Patients who received simultaneous lateral sinus floor augmentation and implant placement were included. Subjects were divided into two groups according to the grafting material, namely xenograft or blood clot, and into sub-groups based on the residual alveolar bone height (RABH) below the maxillary sinus, namely 4 to 6 mm or >6 mm. Kaplan-Meier survival estimates were calculated for each material group and for each sub-group at 1, 3, and 6 years. (3) Results: In total, 289 implants inserted in 136 patients with a one-stage procedure were considered. A total of 35 failures were registered. Overall survival rates were 94.2% for xenograft and 85.9% for blood clot alone at 1 year, 91.1% and 81.6% at 3 years, and 91.1% and 78.7% at 6 years. (4) Conclusions: In patients with 4-6 mm RABH, graftless interventions exploiting blood clot alone were not as successful as those using xenograft. When the RABH is low, sinus floor augmentation associated with grafting materials should be preferred whenever possible.
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Giddon DB, Moeller DR, Deutsch CK. Use of a modified mandibular splint to reduce nocturnal symptoms in persons with post-traumatic stress disorder. Int Dent J 2020; 71:167-171. [PMID: 32981059 PMCID: PMC9275324 DOI: 10.1111/idj.12619] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Revised: 07/28/2020] [Accepted: 07/29/2020] [Indexed: 12/19/2022] Open
Abstract
OBJECTIVE Based on a series of clinical observations that a thicker mandibular splint than that commonly used to treat bruxism and related craniomandibular myofascial pain reduced post-traumatic stress disorder (PTSD) nocturnal symptomatology (sleep disruptions, headaches, and nightmares), this study of 100 PTSD participants was undertaken to systematically establish 'proof of concept' of the therapeutic effectiveness of this modified splinting procedure. METHODS Following the fabrication of splints thicker than those conventionally used, the effectiveness of this new procedure used by dentists was determined by comparing the self-reported frequency and intensity/severity of PTSD symptomatology during a seven-night pretreatment baseline period without the splint with a second seven-night period in which the modified splint was inserted. The scoring for the three dependent measures (sleep disruptions, headaches, and nightmares) was based on the frequencies on a scale from 0-7 multiplied by the intensity/severity on a scale of 1-10. RESULTS Compared with the pre-splint baseline period, the insertion of the thickened splint resulted in a highly significant reduction of sleep disruption, nocturnal headaches, and nightmares. A second seven-night control period without the splint was followed by a second seven-night period with the splint, reproducing the effectiveness of the first splinting period. CONCLUSION The results of this study provide the first systematic, documented proof of concept of the effectiveness of a modified splinting procedure in reducing key nocturnal symptoms in PTSD patients.
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Affiliation(s)
- Donald B. Giddon
- Developmental Biology, Harvard School of Dental Medicine, Harvard University, Boston, MA, USA
| | - Donald R. Moeller
- Moeller Oral and Maxillofacial Surgery, US Army Dental Corps (Ret.), Columbus, GA, USA
| | - Curtis K. Deutsch
- Psychobiology Program, Department of Psychiatry, Eunice Kennedy Shriver Center, University of Massachusetts Medical School, Worcester, MA, USA
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12
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Tan D, Foster S, Korgaonkar MS, Oxenham V, Whittle T, Klineberg I. The role of progressive oral implant rehabilitation in mastication, cognition and oral health‐related quality of life outcomes—A pilot to define the protocol. J Oral Rehabil 2020; 47:1368-1381. [DOI: 10.1111/joor.13085] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/10/2020] [Indexed: 12/23/2022]
Affiliation(s)
- Daniel Tan
- Department of Oral Rehabilitation School of Dentistry Faculty of Medicine and Health University of Sydney Sydney Australia
| | - Sheryl Foster
- School of Health Sciences Faculty of Medicine and Health University of Sydney Sydney Australia
- Radiology Department Westmead Hospital Sydney Australia
| | - Mayuresh S. Korgaonkar
- School of Health Sciences Faculty of Medicine and Health University of Sydney Sydney Australia
- Brain Dynamics Centre Westmead Institute for Medical Research, University of Sydney Sydney Australia
| | - Vincent Oxenham
- Department of Psychology Faculty of Medicine, Health and Human Sciences Macquarie University Sydney Australia
| | - Terry Whittle
- Department of Oral Rehabilitation School of Dentistry Faculty of Medicine and Health University of Sydney Sydney Australia
| | - Iven Klineberg
- Department of Oral Rehabilitation School of Dentistry Faculty of Medicine and Health University of Sydney Sydney Australia
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13
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Αntoniadou M, Varzakas T. Breaking the vicious circle of diet, malnutrition and oral health for the independent elderly. Crit Rev Food Sci Nutr 2020; 61:3233-3255. [PMID: 32686465 DOI: 10.1080/10408398.2020.1793729] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Aging impairs senses, mastication, oral status and function, causing nutritional needs and diet insufficiencies. The present needs of independent older adults suggest that health research and oral health care should shift from reductionist disease management to integral and personal treatment plans, including lifestyle, psychological, nutritional and oral health coaching approaches. Dentists and other medical professionals that work in the field of gerodontology should be educated on the macro and micronutrient needs of the elderly and incorporate certain nutritional plans early in the life of their patients with their approval and cooperation, in order to postpone tooth loss and masticatory impairment. Old recipes such as the Mediterranean diet should be kept as a base for all the elderly and be enriched in a customized interpersonal way from the dentist as well as the medical professional according to the specific needs of one's oral and general health status. In this nonsystematic review paper, the basic aspects of the vicious cycle of nutrition and oral health status are discussed and suggestions of major nutrients' influence and needs for independent elders are reported. Based on the scientific data collected, suggestions are made for the food industry for better quality and dosage of foods for this category of individuals. Such strategies can be a whole new area of interest for the food industry in order to obtain better quality of food packaging for the independent OA with accepted texture, odor, colors, macronutrients and micronutrients' consistency and in specific portions.
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Affiliation(s)
- Maria Αntoniadou
- Dental School, National and Kapodistrian University of Athens, Greece
| | - Theodoros Varzakas
- Dept. Food Science and Technology, University of the Peloponnese, Kalamata, Greece
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14
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Nomura Y, Okada A, Kakuta E, Otsuka R, Sogabe K, Yamane K, Yamamoto T, Shigeta Y, Shigemoto S, Ogawa T, Hanada N. Consistency of supplied food and dentition status of the elderly in residential care homes. BMC Oral Health 2019; 19:74. [PMID: 31046753 PMCID: PMC6498674 DOI: 10.1186/s12903-019-0770-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Accepted: 04/23/2019] [Indexed: 02/06/2023] Open
Abstract
Background The association between oral health and malnutrition has been investigated in detail. The nutrition of elderly subjects in residential care homes is determined by caregivers, dietitians or nutritionists and managed by changing the consistency of their supplied food. However, few reports have described the relationship between oral condition and supplied food consistency. The objective of this study was to determine dentition status and care levels that correlate with supplied food consistency among elderly residents of care facilities. In addition, we estimated the care level at which ordinary food consistency can be supplied by caregivers who cannot diagnose dental status. Method Several factors, including dentition, wearing removable dentures, meals categorized as ordinary or processed (sliced, mashed, or liquefied), and care levels according to the Japanese standardized care-needs certification system were investigated in 276 elderly residents (male, n = 56; female, n = 220; mean age, 87.68 ± 5.94 years) of 12 fee-based care facilities. Results The results of this study showed that care levels were significantly correlated with the consistency of the food supplied to the residents. When supplied food consistency was categorized as ordinary or processed, the number of remaining teeth and the number of tooth contact pairs, either natural or artificial, were statistically significant. From logistic regression analysis, it was determined that the numbers of tooth contact pairs were statistically significant among residents requiring high levels of care. Conclusion The number of tooth contact pairs, either natural or artificial, was one of the contributing factors for deciding supplied food consistency among elderly residents of care facilities. Elderly residents requiring less than care level 3 should have ordinary meals. Electronic supplementary material The online version of this article (10.1186/s12903-019-0770-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yoshiaki Nomura
- Department of Translational Research, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, 230-8501, Japan.
| | - Ayako Okada
- Department of Operative Dentistry, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, 230-8501, Japan
| | - Erika Kakuta
- Department of Oral Microbiology, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, 230-8501, Japan
| | - Ryoko Otsuka
- Department of Translational Research, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, 230-8501, Japan
| | - Kaoru Sogabe
- Department of Translational Research, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, 230-8501, Japan
| | - Kiyoshige Yamane
- Yamane Dental Clinic KUNSHIKAI Medical Corporation, 7-9, Tennojiya, Yao-shi, Osaka, 581-0025, Japan
| | - Taku Yamamoto
- Supercourt Co, Ltd, 1-7-7, Nishihommachi, Nishi-ku Osaka-shi, Osaka, 550-0005, Japan
| | - Yuko Shigeta
- Department of Fixed Prosthodontics, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, 230-8501, Japan
| | - Shuji Shigemoto
- Department of Fixed Prosthodontics, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, 230-8501, Japan
| | - Takumi Ogawa
- Department of Fixed Prosthodontics, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, 230-8501, Japan
| | - Nobuhiro Hanada
- Department of Translational Research, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, 230-8501, Japan
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15
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Racich MJ. Occlusion, temporomandibular disorders, and orofacial pain: An evidence-based overview and update with recommendations. J Prosthet Dent 2018; 120:678-685. [DOI: 10.1016/j.prosdent.2018.01.033] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 01/25/2018] [Accepted: 01/25/2018] [Indexed: 12/13/2022]
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16
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Buser R, Ziltener V, Samietz S, Fontolliet M, Nef T, Schimmel M. Validation of a purpose-built chewing gum and smartphone application to evaluate chewing efficiency. J Oral Rehabil 2018; 45:845-853. [PMID: 30024031 DOI: 10.1111/joor.12696] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 07/02/2018] [Accepted: 07/16/2018] [Indexed: 12/28/2022]
Abstract
OBJECTIVES To validate a purpose-built two-coloured chewing gum (Hue-Check Gum® ), and to test the accuracy of a custom-built smartphone application for a colour-mixing ability test to assess chewing function. METHODS Fully dentate participants (28D-group) and edentulous participants with implant overdentures (IOD-group) were recruited. They chewed a Hue-Check Gum® for 5, 10, 20, 30 and 50 chewing cycles, respectively. Maximum voluntary bite force (MBF) was assessed with a digital gauge. The specimens were analysed according to their colour mixture (variance of hue, VOH) with a validated software (VOH_scan) and a newly developed smartphone application (VOH_app). RESULTS Participants segregated by dental state were significantly different regarding the number of occluding pairs of teeth, age and MBF. VOH_scan showed a negative logarithmic association with the number of chewing cycles, and VOH could be predicted from chewing cycles, MBF and gender. The clearest discrimination between the IOD and the 28D groups was observed for n = 20 chewing cycles; at this point, VOH was distinguishably different with a P-value < 0.0001. The VOH_app was a very good predictor for VOH_scan with 0.80 < pseudo-R2 < 0.83, depending on light exposure and measuring distance. There was, however, a systematic error in the accuracy of the app for inadequately chewed specimens. CONCLUSIONS The use of the two-coloured chewing gum would provide a fast, simple and inexpensive method for the assessment of masticatory performance, which could be used in geriatric wards or in private practices without the requirement of specialised equipment or trained staff.
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Affiliation(s)
- Ramona Buser
- Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - Valerie Ziltener
- Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - Stefanie Samietz
- Department of Prosthodontics, Gerostomatology and Biomaterials, Center for Oral Health, University Medicine Greifswald, Greifswald, Germany
| | - Marta Fontolliet
- Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - Tobias Nef
- Gerontechnology & Rehabilitation Group, University of Bern, Bern, Switzerland.,ARTORG Center for Biomedical Engineering Research, University of Bern, Bern, Switzerland
| | - Martin Schimmel
- Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland.,Division of Gerodontology and Removable Prosthodontics, University Clinics of Dental Medicine, University of Geneva, Geneva, Switzerland
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17
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Lin CS. Meta-analysis of brain mechanisms of chewing and clenching movements. J Oral Rehabil 2018; 45:627-639. [DOI: 10.1111/joor.12657] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/16/2018] [Indexed: 12/26/2022]
Affiliation(s)
- C-S. Lin
- Department of Dentistry; School of Dentistry; National Yang-Ming University; Taipei Taiwan
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18
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Cordeiro CDC, Pozza DH, Tamaki T, Guimarães AS. The importance of the posterior joint space for functional mandibular movements: A laboratory cross-sectional study. J Clin Exp Dent 2018; 10:e61-e65. [PMID: 29670717 PMCID: PMC5899807 DOI: 10.4317/jced.54168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Accepted: 12/06/2017] [Indexed: 11/26/2022] Open
Abstract
Background The search for the ideal, healthy and reproducible position of the condyles is of utmost importance for dental diagnosis and treatment. Thus, the objective of this laboratory cross-sectional study was to verify the relationship between the posterior joint space and the mandibular lateral movements. Material and Methods Dental casts from 15 women and 15 men with normal mastication, 28 natural teeth and no history of temporomandibular disorders or pain, were fabricated and mounted on a fully adjustable articulator. From the maximum intercuspal position, condylar displacement was evaluated and measured on the working and nonworking sides during mandibular lateral movement, both to the right and left sides. Results The correlation between the measures of interest was assessed with the Pearson correlation coefficient (α=.05). Condylar displacement on the working side and nonworking side condyle was 0.88±0.71 mm and 3.57±1.11 mm (right mandibular lateral movement); and 0.91±0.58 mm and 3.51±0.78mm (left mandibular lateral movement), respectively. No significant correlation in the condylar displacement between the working side condyles on the right and on the left sides was observed (r=.22; P=.248). The condylar poles of the articulator moved posteriorly, simulating the functional movements of the mandible during mastication. In all cases, condylar displacement during mandibular lateral movement both to the right and left occurred posteriorly on the working side condyle. Conclusions The condylar poles of the articulator moved posteriorly simulating the functional movements of the mandible during mastication. Moreover, left and right working condyles may require slightly different spaces to function, suggesting minor anatomical asymmetries. Key words:Mastication, dental occlusion, prosthodontics.
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Affiliation(s)
| | - Daniel-Humberto Pozza
- DDS, PhD, Associate Professor, Department of Biomedicine, Faculty of Medicine and Faculty of Nutrition and Food Science, Universidade do Porto, I3s, Porto, Portugal and Universidad Europea de Madrid
| | - Tadachi Tamaki
- DDS, PhD, Deceased 12 August 2014. Professor Emeritus, Department of Dentistry, Universidade de São Paulo, São Paulo, Brazil
| | - Antônio-Sérgio Guimarães
- DDS, PhD, Associate Professor, Pain Experimental Laboratory, Faculdade São Leopoldo Mandic, Campinas, Brazil
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19
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Lin CS. Revisiting the link between cognitive decline and masticatory dysfunction. BMC Geriatr 2018; 18:5. [PMID: 29304748 PMCID: PMC5756393 DOI: 10.1186/s12877-017-0693-z] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 12/18/2017] [Indexed: 12/17/2022] Open
Abstract
Age-related decline in cognitive functions and dementia are major challenges in geriatric healthcare. Accumulating evidence from clinical, epidemiological and animal research suggests that tooth loss may be a risk factor for the decline of cognitive functions. This issue highlights the role of the brain-stomatognathic axis in geriatric medicine. Whether input from the stomatognathic apparatus can affect the brain remains an open debate. By revisiting the evidence published in the past five years, we argue that the hypothesis regarding the association between cognitive decline and masticatory dysfunction should be carefully interpreted. Most of the available clinical and epidemiological studies present only cross-sectional data. With respect to the prospective studies, important confounding factors, such as nutritional and physical conditions, were not fully controlled for. Animal research has revealed that hippocampal deficits may play key roles in the observed cognitive decline. However, experimental intervention and outcome assessments may not capture the condition of human subjects. Brain neuroimaging research may be suitable for bridging the gap between clinical and animal research, potentially contributing to (a) the clarification of the brain network associated with mastication, (b) the identification of brain imaging markers for exploring the mechanisms underlying long-term changes in masticatory functions, and (c) the elucidation of interactions between mastication and other cognitive-affective processing systems. Three potential models of the brain-stomatognathic axis and relevant hypotheses are summarized, focusing on the sensory feedback mechanisms, the compensation of motor control, and cerebellar deficits. Finally, we highlight four critical aspects of study and experimental design that should be considered in future research: (a) the refinement of the considered behavioral assessments, (b) the inclusion of baseline changes in mental and physical conditions,
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Affiliation(s)
- Chia-Shu Lin
- Department of Dentistry, School of Dentistry, National Yang-Ming University, No. 155, Sec. 2, Linong Street, Taipei, 11221, Taiwan.
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20
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Żmudzki J, Chladek G, Krawczyk C. Relevance of Tongue Force on Mandibular Denture Stabilization during Mastication. J Prosthodont 2017; 28:e27-e33. [PMID: 29285830 DOI: 10.1111/jopr.12719] [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] [Accepted: 07/28/2017] [Indexed: 11/29/2022] Open
Abstract
PURPOSE Tongue activity, involving stereognosis of denture position, food bolus distribution, and direct denture pressing, can affect the stability of removable mandibular dentures. Knowledge of details of tongue activity in patients with removable dentures could contribute to the development of training methods to improve bilateral mastication. The hypothesis of this study was that tongue force improves mandibular complete denture stabilization on the atrophied foundation during mastication load transfer with a typical balanced occlusion. MATERIALS AND METHODS Finite element analysis was used to assess the effect of tongue activity on denture stability, which was evaluated with objective biomechanical criteria. Denture movement (displacement), sliding distance on the mucosal surface, and pressure on the foundation during occlusal load transfer were considered with and without additional tongue forces. RESULTS Tongue force in the canine zone of the balancing flange contributed to a slight reduction in the sliding distance. An adverse effect of tongue force on the working side and in the posterior zone of the balancing side was found. CONCLUSIONS Despite the lack of substantial improvement in stability with the addition of tongue forces, tongue action that contributes to a slight reduction in sliding may help reduce common frictional trauma resulting from cyclic movement during chewing. The beneficial impact of tongue force shown in earlier work under conditions of complete adherence of dentures to the foundation indicates a benefit of using adhesives.
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Affiliation(s)
- Jarosław Żmudzki
- Faculty of Mechanical Engineering, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, Gliwice, Poland
| | - Grzegorz Chladek
- Faculty of Mechanical Engineering, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, Gliwice, Poland
| | - Cezary Krawczyk
- Department of Dental Technicians, Medical College of Silesian Province, Zabrze, Poland
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21
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Tramonti Fantozzi MP, De Cicco V, Barresi M, Cataldo E, Faraguna U, Bruschini L, Manzoni D. Short-Term Effects of Chewing on Task Performance and Task-Induced Mydriasis: Trigeminal Influence on the Arousal Systems. Front Neuroanat 2017; 11:68. [PMID: 28848404 PMCID: PMC5550729 DOI: 10.3389/fnana.2017.00068] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Accepted: 07/24/2017] [Indexed: 12/19/2022] Open
Abstract
Trigeminal input to the ascending activating system is important for the maintenance of arousal and may affect the discharge of the noradrenergic neurons of the locus coeruleus (LC), whose activity influences both vigilance state and pupil size, inducing mydriasis. For this reason, pupil size evaluation is now considered an indicator of LC activity. Since mastication activates trigeminal afferent neurons, the aims of the present study, conducted on healthy adult participants, were to investigate whether chewing a bolus of different hardness may: (1) differentially affect the performance on a cognitive task (consisting in the retrieval of specific target numbers within numerical matrices) and (2) increase the dilatation of the pupil (mydriasis) induced by a haptic task, suggesting a change in LC activation. Results show that chewing significantly increased both the velocity of number retrieval (without affecting the number of errors) and the mydriasis associated with the haptic task, whereas simple task repetition did not modify either retrieval or mydriasis. Handgrip exercise, instead, significantly decreased both parameters. Effects were significantly stronger and longer lasting when subjects chewed hard pellets. Finally, chewing-induced improvements in performance and changes in mydriasis were positively correlated, which suggests that trigeminal signals enhanced by chewing may boost the cognitive performance by increasing LC activity.
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Affiliation(s)
| | - Vincenzo De Cicco
- Department of Translational Research and of New Surgical and Medical Technologies, University of PisaPisa, Italy
| | - Massimo Barresi
- Institut des Maladies Neurodégénératives, University of BordeauxBordeaux, France
| | | | - Ugo Faraguna
- Department of Translational Research and of New Surgical and Medical Technologies, University of PisaPisa, Italy.,Department of Developmental Neuroscience, IRCCS Foundation Stella MarisPisa, Italy
| | - Luca Bruschini
- Department of Surgical, Medical, Molecular Pathology and Critical Care Medicine, University of PisaPisa, Italy
| | - Diego Manzoni
- Department of Translational Research and of New Surgical and Medical Technologies, University of PisaPisa, Italy
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22
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Avivi-Arber L, Seltzer Z, Friedel M, Lerch JP, Moayedi M, Davis KD, Sessle BJ. Widespread Volumetric Brain Changes following Tooth Loss in Female Mice. Front Neuroanat 2017; 10:121. [PMID: 28119577 PMCID: PMC5220047 DOI: 10.3389/fnana.2016.00121] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Accepted: 12/01/2016] [Indexed: 12/19/2022] Open
Abstract
Tooth loss is associated with altered sensory, motor, cognitive and emotional functions. These changes vary highly in the population and are accompanied by structural and functional changes in brain regions mediating these functions. It is unclear to what extent this variability in behavior and function is caused by genetic and/or environmental determinants and which brain regions undergo structural plasticity that mediates these changes. Thus, the overall goal of our research program is to identify genetic variants that control structural and functional plasticity following tooth loss. As a step toward this goal, here our aim was to determine whether structural magnetic resonance imaging (sMRI) is sensitive to detect quantifiable volumetric differences in the brains of mice of different genetic background receiving tooth extraction or sham operation. We used 67 adult female mice of 7 strains, comprising the A/J (A) and C57BL/6J (B) strains and a randomly selected sample of 5 of the 23 AXB-BXA strains (AXB1, AXB4, AXB24, BXA14, BXA24) that were produced from the A and B parental mice by recombinations and inbreeding. This panel of 25 inbred strains of genetically diverse inbred strains of mice is used for mapping chromosomal intervals throughout the genome that harbor candidate genes controlling the phenotypic variance of any trait under study. Under general anesthesia, 39 mice received extraction of 3 right maxillary molar teeth and 28 mice received sham operation. On post-extraction day 21, post-mortem whole-brain high-resolution sMRI was used to quantify the volume of 160 brain regions. Compared to sham operation, tooth extraction was associated with a significantly reduced regional and voxel-wise volumes of cortical brain regions involved in processing somatosensory, motor, cognitive and emotional functions, and increased volumes in subcortical sensorimotor and temporal limbic forebrain regions including the amygdala. Additionally, comparison of the 10 BXA14 and 21 BXA24 mice revealed significant volumetric differences between the two strains in several brain regions. These findings highlight the utility of high-resolution sMRI for studying tooth loss-induced structural brain plasticity in mice, and provide a foundation for further phenotyping structural brain changes following tooth loss in the full AXB-BXA panel to facilitate mapping genes that control brain plasticity following orofacial injury.
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Affiliation(s)
- Limor Avivi-Arber
- University of Toronto Centre for the Study of Pain, University of TorontoToronto, ON, Canada
- Faculty of Dentistry, University of TorontoToronto, ON, Canada
| | - Ze'ev Seltzer
- University of Toronto Centre for the Study of Pain, University of TorontoToronto, ON, Canada
- Faculty of Dentistry, University of TorontoToronto, ON, Canada
- Department of Physiology, Faculty of Medicine, University of TorontoToronto, ON, Canada
- Department of Anesthesiology, University Health NetworkToronto, ON, Canada
- Central Institute of Mental Health, University of HeidelbergMannheim, Germany
| | - Miriam Friedel
- Mouse Imaging Centre, Hospital for Sick ChildrenToronto, ON, Canada
| | - Jason P. Lerch
- Mouse Imaging Centre, Hospital for Sick ChildrenToronto, ON, Canada
- Medical Biophysics, Faculty of Medicine, University of TorontoToronto, ON, Canada
| | - Massieh Moayedi
- University of Toronto Centre for the Study of Pain, University of TorontoToronto, ON, Canada
- Faculty of Dentistry, University of TorontoToronto, ON, Canada
| | - Karen D. Davis
- University of Toronto Centre for the Study of Pain, University of TorontoToronto, ON, Canada
- Department of Surgery, University of TorontoToronto, ON, Canada
- Institute of Medical Science, University of TorontoToronto, ON, Canada
- Division of Brain, Imaging and Behaviour - Systems Neuroscience, Krembil Research Institute, Toronto Western Hospital, University Health NetworkToronto, ON, Canada
| | - Barry J. Sessle
- University of Toronto Centre for the Study of Pain, University of TorontoToronto, ON, Canada
- Faculty of Dentistry, University of TorontoToronto, ON, Canada
- Department of Physiology, Faculty of Medicine, University of TorontoToronto, ON, Canada
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23
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He SS, Li F, Gu T, Liu Y, Zou SJ, Huang XQ, Lui S, Gong QY, Chen S. Altered neural activation pattern during teeth clenching in temporomandibular disorders. Oral Dis 2016; 22:406-14. [PMID: 26913995 DOI: 10.1111/odi.12465] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Revised: 01/28/2016] [Accepted: 02/11/2016] [Indexed: 02/05/2023]
Affiliation(s)
- SS He
- Department of Orthodontics; State Key Laboratory of Oral Disease; West China School of Stomatology; Sichuan University; Chengdu Sichuan China
| | - F Li
- Department of Radiology; Huaxi MR Research Center (HMRRC); West China Hospital of Sichuan University; Chengdu Sichuan China
| | - T Gu
- Department of Orthodontics; State Key Laboratory of Oral Disease; West China School of Stomatology; Sichuan University; Chengdu Sichuan China
| | - Y Liu
- Department of Orthodontics; State Key Laboratory of Oral Disease; West China School of Stomatology; Sichuan University; Chengdu Sichuan China
| | - SJ Zou
- Department of Orthodontics; State Key Laboratory of Oral Disease; West China School of Stomatology; Sichuan University; Chengdu Sichuan China
| | - XQ Huang
- Department of Radiology; Huaxi MR Research Center (HMRRC); West China Hospital of Sichuan University; Chengdu Sichuan China
| | - S Lui
- Department of Radiology; Huaxi MR Research Center (HMRRC); West China Hospital of Sichuan University; Chengdu Sichuan China
| | - QY Gong
- Department of Radiology; Huaxi MR Research Center (HMRRC); West China Hospital of Sichuan University; Chengdu Sichuan China
| | - S Chen
- Department of Orthodontics; State Key Laboratory of Oral Disease; West China School of Stomatology; Sichuan University; Chengdu Sichuan China
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De Cicco V, Barresi M, Tramonti Fantozzi MP, Cataldo E, Parisi V, Manzoni D. Oral Implant-Prostheses: New Teeth for a Brighter Brain. PLoS One 2016; 11:e0148715. [PMID: 26919258 PMCID: PMC4771091 DOI: 10.1371/journal.pone.0148715] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Accepted: 12/15/2015] [Indexed: 12/22/2022] Open
Abstract
Several studies have demonstrated that chewing can be regarded as a preventive measure for cognitive impairment, whereas masticatory deficiency, associated with soft-diet feeding, is a risk factor for the development of dementia. At present the link between orofacial sensorimotor activity and cognitive functions is unknown. In subjects with unilateral molar loss we have shown asymmetries in both pupil size and masticatory muscles electromyographic (EMG) activity during clenching: the molar less side was characterized by a lower EMG activity and a smaller pupil. Since implant-prostheses, greatly reduced both the asymmetry in EMG activity and in pupil's size, trigeminal unbalance, leading to unbalance in the activity of the Locus Coeruleus (LC), may be responsible for the pupil's asymmetry. According to the findings obtained in animal models, we propose that the different activity of the right and left LC may induce an asymmetry in brain activity, thus leading to cognitive impairment. According to this hypothesis, prostheses improved the performance in a complex sensorimotor task and increased the mydriasis associated with haptic tasks. In conclusion, the present study indicates that the implant-prosthesis therapy, which reduces the unbalance of trigeminal proprioceptive afferents and the asymmetry in pupil's size, may improve arousal, boosting performance in a complex sensorimotor task.
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Affiliation(s)
- Vincenzo De Cicco
- Department of Translational Research, University of Pisa, Pisa, Italy
| | - Massimo Barresi
- Department of Drug Sciences, University of Catania, Catania, Italy
| | | | | | | | - Diego Manzoni
- Department of Translational Research, University of Pisa, Pisa, Italy
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Chiodelli L, Pacheco ADB, Missau TS, Silva AMTD, Corrêa ECR. Influência da hipermobilidade articular generalizada sobre a articulação teoromandibular, mastigação e deglutição: estudo transversal. REVISTA CEFAC 2015. [DOI: 10.1590/1982-0216201512514] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
OBJETIVO: avaliar a articulação temporomandibular, as funções de mastigação e deglutição em mulheres assintomáticas com e sem hipermobilidade articular generalizada e a associação entre estas variáveis. MÉTODOS: foram avaliadas 43 voluntárias no Serviço de Atendimento Fonoaudiológico da Universidade Federal de Santa Maria. Ahipermobilidadefoi avaliada pelo Escore de Beighton e, a partir dos escores obtidos, as voluntárias foram distribuídas em dois grupos: com (n=17) e sem hipermobilidade (n=26). A articulação temporomandibular foi examinada pelo instrumento Critérios de Diagnóstico para Pesquisa de Desordens Temporomandibularese as funções de mastigação e deglutição foram avaliadas por meio do exame miofuncional orofacial. RESULTADOS: a avaliação clínica da articulação temporomandibular demonstrou predomínio de ruídos articulares durante movimentos mandibulares (52,9%) e de desvio na abertura da boca (76,5%) nas voluntárias do grupo com hipermobilidade, sem diferença significante entre os grupos. No exame da função mastigatória, apesar da maioria das voluntárias apresentar padrão de mastigação bilateral alternado, a frequência desse foisignificantemente menor no grupo com hipermobilidade (p=0,05). Foi verificada uma associação significante(p=0,02) entre o padrão de mastigação e de abertura da boca, apenas no grupo sem hipermobilidade, e não houve diferença na deglutição entre os grupos. CONCLUSÃO: as mulheres assintomáticas apresentaram indícios de que a hipermobilidade predispõe à ocorrência de desvio na abertura da boca e ruídos articulares. Não houve diferença na função de deglutição, porém verificou-se uma frequência menor de mastigação bilateral alternada no grupo com hipermobilidade em relação ao sem hipermobilidade.
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26
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Banu R F, Veeravalli PT, Kumar V A. Comparative Evaluation of Changes in Brain Activity and Cognitive Function of Edentulous Patients, with Dentures and Two-Implant Supported Mandibular Overdenture-Pilot Study. Clin Implant Dent Relat Res 2015; 18:580-7. [DOI: 10.1111/cid.12336] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fathima Banu R
- Department of Prosthodontics; Faculty of Dental Science; Sri Ramachandra University; Chennai Tamilnadu India
| | - Padmanabhan T. Veeravalli
- Department of Prosthodontics; Faculty of Dental Science; Sri Ramachandra University; Chennai Tamilnadu India
| | - Anand Kumar V
- Department of Prosthodontics; Faculty of Dental Science; Sri Ramachandra University; Chennai Tamilnadu India
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27
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Abstract
OBJECTIVE Since the pathophysiology of bruxism is not clearly understood, there exists no possible treatment. The aim of this study is to investigate the cerebral activation differences between healthy subjects and patients with bruxism on behalf of possible aetiological factors. METHODS 12 healthy subjects and 12 patients with bruxism, a total of 24 right-handed female subjects (aged 20-27 years) were examined using functional MRI during tooth-clenching and resting tasks. Imaging was performed with 3.0-T MRI scanner with a 32-channel head coil. Differences in regional brain activity between patients with bruxism and healthy subjects (control group) were observed with BrainVoyager QX 2.8 (Brain Innovation, Maastricht, Netherlands) statistical data analysis program. Activation maps were created using the general linear model: single study and multistudy multisubject for statistical group analysis. This protocol was approved by the ethics committee of medical faculty of Kirikkale University, Turkey (02/04), based on the guidelines set forth in the Declaration of Helsinki. RESULTS The group analysis revealed a statistically significant increase in blood oxygenation level-dependent signal of three clusters in the control group (p<0.005), which may indicate brain regions related with somatognosis, repetitive passive motion, proprioception and tactile perception. These areas coincide with Brodmann areas 7, 31, 39 and 40. It is conceivable that there are differences between healthy subjects and patients with bruxism. CONCLUSIONS Our findings indicate that there was a decrease of cortical activation pattern in patients with bruxism in clenching tasks. This indicates decreased blood flow and activation in regional neuronal activity. Bruxism, as an oral motor disorder concerns dentistry, neurology and psychiatry. These results might improve the understanding and physiological handling of sleep bruxism.
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Affiliation(s)
- S Yılmaz
- Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Kirikkale University, Kirikkale, Turkey
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28
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Donovan TE, Marzola R, Becker W, Cagna DR, Eichmiller F, McKee JR, Metz JE, Albouy JP. Annual review of selected scientific literature: report of the Committee on Scientific Investigation of the American Academy of Restorative Dentistry. J Prosthet Dent 2014; 112:1038-87. [PMID: 25443419 DOI: 10.1016/j.prosdent.2014.09.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Revised: 09/02/2014] [Accepted: 09/02/2014] [Indexed: 12/14/2022]
Affiliation(s)
- Terence E Donovan
- Chair, Committee on Scientific Investigation, American Academy of Restorative Dentistry (AARD); Professor and Section Head for Biomaterials, Department of Operative Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, NC.
| | | | - William Becker
- Clinical Professor, Advanced Education in Prosthodontics, Herman Ostrow School of Dentistry, University of Southern California; private practice, Tucson, Ariz
| | - David R Cagna
- Associate Dean, Professor and Director, Advanced Prosthodontics, University of Tennessee, Health Science Center, College of Dentistry, Memphis, Tenn
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29
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Gutiérrez MF, Valenzuela S, Miralles R, Portus C, Santander H, Fuentes AD, Celhay I. Does breathing type influence electromyographic activity of obligatory and accessory respiratory muscles? J Oral Rehabil 2014; 41:801-8. [PMID: 25040551 DOI: 10.1111/joor.12209] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/13/2014] [Indexed: 11/28/2022]
Abstract
Craniomandibular electromyographic (EMG) studies frequently include several parameters, e.g. resting, chewing and tooth-clenching. EMG activity during these parameters has been recorded in the elevator muscles, but little is known about the respiratory muscles. The aim of this study was to compare EMG activity in obligatory and accessory respiratory muscles between subjects with different breathing types. Forty male subjects were classified according to their breathing type into two groups of 20 each: costo-diaphragmatic breathing type and upper costal breathing type. Bipolar surface electrodes were placed on the sternocleidomastoid, diaphragm, external intercostal and latissimus dorsi muscles. EMG activity was recorded during the following tasks: (i) normal quiet breathing, (ii) maximal voluntary clenching in intercuspal position, (iii) natural rate chewing until swallowing threshold, (iv) short-time chewing. Diaphragm EMG activity was significantly higher in the upper costal breathing type than in the costo-diaphragmatic breathing type in all tasks (P < 0·05). External intercostal EMG activity was significantly higher in the upper costal breathing type than in the costo-diaphragmatic breathing type in tasks 3 and 4 (P < 0·05). Sternocleidomastoid and latissimus dorsi EMG activity did not show significant differences between breathing types in the tasks studied (P > 0·05). The significantly higher EMG activity observed in subjects with upper costal breathing than in the costo-diaphragmatic breathing type suggests that there could be differences in motor unit recruitment strategies depending on the breathing type. This may be an expression of the adaptive capability of muscle chains in subjects who clinically have a different thoraco-abdominal expansion during inspiration at rest.
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Affiliation(s)
- M F Gutiérrez
- Faculty of Odontology, Institute for Research in Dental Sciences, University of Chile, Santiago, Chile; Faculty of Medicine, Oral Physiology Laboratory, Biomedical Sciences Institute, University of Chile, Santiago, Chile
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Listl S. Oral health conditions and cognitive functioning in middle and later adulthood. BMC Oral Health 2014; 14:70. [PMID: 24923362 PMCID: PMC4067064 DOI: 10.1186/1472-6831-14-70] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Accepted: 06/10/2014] [Indexed: 11/17/2022] Open
Abstract
Background The purpose of the present study was to examine the impact of oral health conditions on cognitive functioning on basis of data samples from several European countries. Methods Secondary analyses were conducted of data from wave 2 of the Survey of Health, Ageing, and Retirement in Europe (SHARE) which includes 14 European countries and is intended to be representative of each country’s middle and later adulthood population. Information on word recall, verbal fluency, and numeracy as well as information on chewing ability and denture wearing status was available for a total of 28,693 persons aged 50+. Multivariate regression analysis was used to detect influences of oral health parameters on cognitive functioning (p < 0.05). Results Persons with good chewing ability or without dentures had significantly better word recall, verbal fluency, and numeracy skills than persons with chewing impairment or with dentures. The observed patterns of parameter estimates imply differential oral health impacts on numeracy compared to word recall and verbal fluency. Conclusions The present study provides novel large-scale epidemiological evidence supportive of an association between oral health and cognitive functioning. Future research should intend to verify the precise causal links between oral health conditions, various cognitive dimensions, and their neural correlates.
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Affiliation(s)
- Stefan Listl
- Department of Conservative Dentistry, University of Heidelberg, Heidelberg, Germany.
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