Publishing type：Research paper (scientific journal)   Publisher：SAGE Publications  

Because a relationship has been reported between masticatory behavior, obesity, and postprandial blood glucose, it is recommended to chew well and take a longer time to eat. The purpose of this study was to examine the possibility of changing masticatory behavior using a small ear-hung wearable chewing counter, which can monitor masticatory behavior without disturbing daily meals. In total, 235 healthy volunteers participated in a 4-wk randomized controlled trial and were divided into 3 groups. All participants were instructed about the importance of mastication at the first visit. During the intervention, group B used the chewing counter without an algorithm during each meal (notification of the number of chews after meal), and group C used the chewing counter with a masticatory behavior change algorithm (setting a target value and displaying the number of chews in real time). Group A was set as the control group. The number of chews and the meal time when consuming 1 rice ball (100 g) were measured before and after the intervention using the chewing counter, and the rate of change in these values was evaluated. Participants also provided a subjective evaluation of their changes in masticatory behavior. The number of chews and the meal time of 1 rice ball increased significantly in groups B and C compared with before the intervention, and the rate of change was significantly higher in group C than in group A and group B. In addition, the subjective evaluation of the change in the number of chews was highest in group C. Self-monitoring of masticatory behavior by providing a target value and the degree of achievement for the number of chews using a wearable chewing counter with a behavioral change algorithm could promote effective change in masticatory behavior and lead to an increased number of chews. (Trial ID: UMIN000034476)

DOI： 10.1177/00220345221118013

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Other Link： http://journals.sagepub.com/doi/full-xml/10.1177/00220345221118013

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

Abstract

Objective

This study aimed to verify the compatibility of masticatory performance tests using different two types of gummy jellies.

Background data discussing the present status of the field

Compatibility between the glucose concentration measuring method (GC) and 10‐steps visual scoring method (VS), which are masticatory performance tests for diagnosing decreased masticatory function (DMF) in oral hypofunction and the use of different types of gummy jelly, has yet to be confirmed.

Materials and methods

The participants consisted of 134 Japanese older people (51 men and 83 women). GC, VS and the increased surface area measuring method (ISA), as an alternative analysis method for VS, were conducted to evaluate masticatory performance. Cohen's Kappa coefficient was used to verify the consistency for detecting DMF between GC and VS. Pearson's correlation coefficient was used to analyse the relationship between GC and ISA. Each masticatory performance was compared among three different groups for the number of residual teeth. Cut‐off values of VS and ISA for DMF that were consistent with GC were identified.

Results

Glucose concentration measuring method and VS showed an excellent consistency (Kappa coefficient = 0.86). There was a high positive correlation between GC and ISA (r = .70). However, the change in masticatory performance according to the number of teeth was different between GC and VS/ISA. The cut‐off values of VS and ISA were a Score of 2 and 1687 mm², respectively.

Conclusion

Glucose concentration measuring method and VS/ISA remained fairly consistent for detecting DMF, which might be useful information to interconnect the various studies on masticatory performance.

DOI： 10.1111/ger.12601

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Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1111/ger.12601

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

© 2017 John Wiley & Sons Ltd To determine whether maximum bite force (MBF), an objective measure of oral function, is associated with development of frailty in community-dwelling older adults. This prospective cohort study included community-dwelling Japanese adults aged 75 years at baseline (n = 322). Baseline MBF was measured using an electronic recording device (Occlusal Force-Meter GM10). Follow-up examinations, including physical fitness and anthropometric evaluation and structured questionnaires, were administered annually over a 5-year period to determine the incidence of frailty, which was defined by the presence of 3 or more of the following 5 components derived from the Cardiovascular Health Study: low level of mobility, low physical activity level, weakness, shrinking and poor endurance and energy. Adjusted hazard ratios (HRs) of incidence of frailty according to sex-stratified tertiles of baseline MBF were calculated using Cox proportional hazards regression models. During the follow-up, 49 participants (15.2%) developed frailty. Participants in the lower tertile of MBF exhibited a significantly greater risk of frailty than those in the upper tertile. After adjustment for sex, depression, diabetes and Eichner index, the adjusted HRs for frailty in the upper through lower tertiles of MBF were 1.00 (reference), 1.27 (95% confidence interval [CI]: 0.50-3.20) and 2.78 (95% CI: 1.15-6.72), respectively (P for trend =.01). Poor oral function, as indicated by low MBF, increases the risk of development of frailty among elderly men and women.

DOI： 10.1111/joor.12578

Scopus

PubMed

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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

Scopus

PubMed

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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

Web of Science

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

症例の概要:患者は64歳の女性。義歯床下粘膜の疼痛と上顎前歯部連結冠の脱離を主訴に来院した。前歯部のみに咬合接触が残存し、臼歯部咬合支持がない部分歯列欠損を呈していた。上顎にオーバーデンチャー、下顎にアンレーレストを用いた可撤性義歯による補綴を行い、咀嚼機能を回復することができた。考察:オーバーデンチャーを使用することによって、歯根膜粘膜支持と咬合平衡を得て義歯を安定させることができた。結論:前歯部のみに咬合接触が残存し、臼歯部咬合支持が無い部分欠損症例に対し、上顎にオーバーデンチャー、下顎にアンレーレストを用いた部分床義歯を装着し、良好な経過を得ることができた。(著者抄録)

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Other Link： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2017&ichushi_jid=J05334&link_issn=&doc_id=20170726140017&doc_link_id=%2Fdv5proso%2F2017%2F000903%2F021%2F0259-0262%26dl%3D0&url=http%3A%2F%2Fwww.medicalonline.jp%2Fjamas.php%3FGoodsID%3D%2Fdv5proso%2F2017%2F000903%2F021%2F0259-0262%26dl%3D0&type=MedicalOnline&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00004_2.gif

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

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

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Language：Japanese   Publisher：日本顎口腔機能学会  

【目的】下顎がタッピング運動をする際、頭部と体幹はどのように動いているのか、また下顎の運動量と頭部、体幹の運動量には一定の関係があるのかを明らかにする。【方法】下顎運動と頭部運動の測定には、6自由度顎運動測定装置TRIMET II(東京歯材社製)を、体幹動揺の測定には、赤外線反射光方式の三次元モーションキャプチャーシステムProReflex(Qualisys社製)を使用した。被験者は顎口腔機能に異常を認めないボランティア男性6名(24〜29歳、平均年齢:25.8±1.7歳)とした。被験運動は頻度が3Hzで、被験者が無理なく行える可能な限り大きい開口で行う20秒間のタッピング運動とした。計測点は下顎切歯点、上顎切歯点、胸骨点とした。下顎切歯点の垂直的移動量を開口量とし、上顎切歯点の垂直的移動距離を頭部運動量とした。また、胸骨点の前後的移動量を体幹動揺量とした。【結果】立位でタッピング運動を行うと、頭部は開口時に後屈し、閉口時に前屈していた。体幹は開口時に前方、閉口時に後方に動いていた。頭部運動量は0.6〜10.7mmで開口量の5.2〜40.5%の大きさであった。体幹動揺量は0.2〜1.8mmで開口量の1.3〜6.8%の大きさであった。開口量と頭部運動量、および体幹動揺量のそれぞれの2変数間に相関が認められた。【結論】開口量が増すと頭部運動量と体幹動揺量が増すことが明らかになった。下顎が運動し、随伴して頭部が運動すると、頸部より上での重心の移動が起こり、それに対して体幹が運動することによって姿勢を保持していると考えられ、体幹動揺および頭部運動は顎運動を円滑に進める働きを担っている可能性が示唆された。(著者抄録)

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Other Link： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2012&ichushi_jid=J02994&link_issn=&doc_id=20120523290002&doc_link_id=10.7144%2Fsgf.18.115&url=https%3A%2F%2Fdoi.org%2F10.7144%2Fsgf.18.115&type=J-STAGE&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00007_3.gif

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

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Event date： 2011.6

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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