Publishing type：Research paper (scientific journal)   Publisher：Wiley  

There is limited information on the impact of oral function on mortality among older adults. The aim of this prospective cohort study was to examine whether an objective measure of oral function, maximum bite force (MBF), is associated with mortality in older adults during a 13-year follow-up period. Five hundred and fifty-nine community-dwelling Japanese (282 men and 277 women) aged 70 years at baseline were included in the study. Medical and dental examinations and a questionnaire survey were conducted at baseline. Maximum bite force was measured using an electronic recording device (Occlusal Force-Meter GM10). Follow-up investigation to ascertain vital status was conducted 13 years after baseline examinations. Survival rates among MBF tertiles were compared using Cox proportional hazards regression models stratified by sex. There were a total of 111 deaths (82 events for men and 29 for women). Univariable analysis revealed that male participants in the lower MBF tertile had increased risk of all-cause mortality [hazard ratio (HR) = 1·94, 95% confidence interval (CI) = 1·13–3·34] compared with those in the upper MBF tertile. This association remained significant after adjustment for confounders (adjusted HR = 1·84, 95% CI = 1·07–3·19). Conversely, no association between MBF and all-cause mortality was observed in female participants. Maximum bite force was independently associated with all-cause mortality in older Japanese male adults. These data provide additional evidence for the association between oral function and geriatric health.

DOI： 10.1111/joor.12401

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER IRELAND LTD  

Purpose:' The aim of this study was to reveal whether the differences in further loss of teeth and occlusal supports, and change in masticatory ability depend on the status of dentition at the age of 70 in community-dwelling elderly people.
Methods: A 10-year longitudinal survey was carried out on 349 (176 females and 173 males) elderly subjects. The subjects to be analyzed were classified into four groups in accordance with the classifications of Miyachi's Triangular Classification. Zone A: subjects with ten or more occlusal supports. Zone B: those with nine to five occlusal supports. Zone D: those with four or fewer occlusal supports and 11 or more remaining teeth. Zone C: those with ten or fewer remaining teeth. The numbers of remaining teeth and occlusal supports were recorded in both examinations. Questionnaires regarding their food intake status were given to subjects.
Results: Subjects in Zone B had greater numbers of teeth loss than those in Zones A and C. Subjects in Zone B and D lost greater numbers of occlusal supports than subjects in Zones A and C. The number of food items that could be chewed had significantly decreased in subjects who remained in Zone A and those who changed from Zone B to Zones D and C.
Conclusions: It was shown that various states of dentition classified by Miyachi's Triangular Classification at the age of 70 resulted in different numbers of remaining teeth and occlusal supports and changes in masticatory ability 10 years later in community-dwelling elderly people. (C) 2016 Japan Prosthodontic Society. Published by Elsevier Ltd.

DOI： 10.1016/j.jpor.2015.12.008

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Language：Japanese   Publisher：(公社)日本補綴歯科学会  

DOI： 10.2186/ajps.7.154

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Language：Japanese   Publisher：Japan Prosthodontic Society  

<B>Purpose:</B> This study aimed to define the relationship between satisfaction of wearing denture and three factors ("easy to chew", "retention in chewing", "absence of pain"), as well as the missing teeth pattern with Miyachi classification, the chewing ability.<br><B>Methods:</B> A total of 256 subjects (born in 1927) living in Niigata city, Japan who had answered a questionnaire survey in 2007 on the relationship between oral health and health status were selected for this study. Satisfaction with dentures and three factors ("easy to chew", "retention in chewing", and "absence of pain") were evaluated with the VAS score. This study also investigated grouping the pattern of missing teeth based on the Miyachi classification. In addition, a questionnaire was conducted to investigate whether the elderly people could chew around 15 different food items or not.<br><B>Result:</B> It was clearly shown that satisfaction with dentures was correlated with the three points of chewing easily, stability, and pain-free among elderly people. However, none of the three points showed a far stronger correlation than the others. The results also showed that there was no relation between the missing teeth pattern classified with the Miyachi classification and satisfaction with dentures. The results of the questionnaire revealed that the number of food items taken by the elderly people was significantly lower in the group not satisfied with dentures than the other groups (Excellent, good, poorly satisfaction group). <br><B>Conclusion:</B> It was confirmed that chewing easily, stability and pain-free enhance satisfaction with dentures. However, satisfaction with dentures was not ascribed to the pattern of missing teeth; accordingly, we consider that we can keep elderly people satisfied by fabricating good dentures and performing appropriate adjustments regardless of difficult patterns of missing teeth.

DOI： 10.2186/ajps.1.361

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Other Link： http://search.jamas.or.jp/link/ui/2010031506

Publishing type：Research paper (scientific journal)  

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Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/s0006-8993(00)02433-1

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier  

Effects of food consistency on the mode of the phase-linked modulation in the digastric reflex amplitude were examined in naturally chewing rabbits. Two test foods with different textures (bread as a soft food, pellet as a hard food) were used. The digastric reflex was elicited by electrical stimulation (10 train pulses at 2 kHz) of the inferior alveolar nerve. The amplitude of the digastric reflex measured was divided into three categories depending on the chewing phases in which the stimulus was delivered and each value was compared with the control response obtained when the animal was resting. The reflex was strongly inhibited in the jaw-opening phase and no difference was observed in the inhibitory effect between the foods. In the jaw-closing phase, larger digastric reflexes than those in the opening phase were elicited with both foods. This was the case in both the fast-closing and slow-closing phases. Reflex amplitude was significantly larger during chewing of the hard food than the soft food and, thereafter, inhibition of the reflex was observed only during chewing of the soft food in the closing phase. The results suggest the following: (1) food consistency may affect the central mechanism which regulates the digastric reflex and (2) the reflex may contribute to the regulation of masticatory force during chewing particularly hard food.

DOI： 10.1016/S0006-8993(97)01470-4

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Language：Japanese   Publisher：(一社)日本老年歯科医学会  

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Language：Japanese   Publisher：(一社)日本老年歯科医学会  

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Language：Japanese   Publisher：(一社)日本老年歯科医学会  

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Language：Japanese  

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Language：Japanese   Publisher：(株)ヒョーロン・パブリッシャーズ  

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DOI： 10.7144/sgf.4.191

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Publisher：Japanese Society of Stomatognathic Function  

DOI： 10.7144/sgf.4.191

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Presentation type：Poster presentation  

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Presentation type：Oral presentation (general)  

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Presentation type：Oral presentation (general)  

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Presentation type：Oral presentation (general)  

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Presentation type：Oral presentation (general)  

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Presentation type：Oral presentation (general)  

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Presentation type：Oral presentation (general)  

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