記述言語：英語   掲載種別：研究論文（学術雑誌）  

BACKGROUND: Lip closing functions have never been evaluated from the viewpoint of elastic properties. OBJECTIVES: The purpose of the present study was to investigate the behavior of the lower orbicularis oris muscle during a button-pull exercise to measure lip closing force and quantitatively evaluate its elastic properties using sonographic elastography. METHODS: Appropriate compression loads for elastography were randomly measured on one of three types of acoustic couplers on three examiners. Compression tests were performed on three types of acoustic couplers within the appropriate compression load. Using the acoustic coupler with the lowest elastic modulus, the strain ratio of the lower orbicularis oris muscle during lip closing was measured, and elastography was performed on six males under tension loads of 0-8 N. RESULTS: The intraclass correlation coefficient (1, 3) for the tension load of 0 N was 0.81. Elastography showed that the strain ratio values increased significantly (p < 0.05) as the tension load increased. CONCLUSIONS: Combining the data obtained from lip closing test devices and sonographic elastography enabled the muscle performance to be evaluated objectively and accurately.

DOI： 10.3233/BME-201101

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

OBJECTIVES: The present study was performed to investigate the mineral density distribution in enamel and dentin for both permanent and primary teeth and to establish the standard density per tooth type using micro-computed tomography (CT). METHODS: Fifty-seven extracted human teeth (37 permanent, 20 primary) were evaluated in the present study. The enamel and dentin mineral densities in the extracted teeth were measured using micro-CT. Cubic regression curves were used to determine the mineral density distribution in the enamel and dentin for each tooth type. RESULTS: The mean values, distributions, and regression equations of the mineral densities were obtained. The mean mineral density values for permanent enamel and dentin were significantly higher than those for their primary counterparts for each tooth type. CONCLUSIONS: In the present study, we demonstrated the distribution of mineral density in sound enamel and dentin and attempted to determine the standard mineral density for each tooth type using micro-CT. The mineral density distributions found in this study contribute to our understanding of the mechanical properties of enamel and dentin. A positive correlation suggests that the systemic bone mineral density could be predicted based on the analysis of exfoliated teeth, such as in patients with hypophosphatasia. The present results may be useful in establishing a numerical standard for the mechanism involved in root fracture and for early detection of root fracture risk.

DOI： 10.1007/s11282-018-0315-2

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記述言語：日本語   出版者・発行元：一般社団法人 日本摂食嚥下リハビリテーション学会  

<p>口腔乾燥症の原因は，シェーグレン症候群（SS），ストレス，薬剤の副作用など多岐にわたるうえ，原因は 1つではない可能性がある．しかし，口腔乾燥症の診断基準は統一されておらず，医療機関あるいは歯科医師によって異なるのが現状である．また，従来のフローチャート形式の診断チャートでは，複数診断を行うことが困難である．著者らは，口腔乾燥症の診断を統一基準のもとで簡便に行うことを目的として，口腔乾燥症の診断基準を作成した．また，その診断基準をもとに， A4用紙 1枚の診断チャートを作成した．その後， 2014年 1月から 2016年 12月に当科を受診した初診患者 220名を対象として，診断チャートを用いた臨床統計を行った． 診断の結果，自律神経性口腔乾燥症（135 名， 61.4%）が最も多く，次いで薬剤性（126名， 57.3%），蒸発性（81名， 36.8%），シェーグレン症候群（35名， 15.9%），心因性（歯科心身症）（32名， 14.5%）であった．複数の歯科医師による診断の一致度は，カッパ係数が 0.99で非常に高かった（<i>p</i>＜ 0.001）．診断名が 2つ以上ついている者は 74.5%であった． 今回，口腔乾燥症には，複数の要因が関連している可能性が高いことが明らかになった．今後，口腔乾燥症の診断にあたっては，複数診断が可能な口腔乾燥症診断チャートを使用することが有用であると考えられる． </p>

DOI： 10.32136/jsdr.22.2_153

CiNii Article

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その他リンク： http://search.jamas.or.jp/link/ui/2019231072

記述言語：日本語   出版者・発行元：特定非営利活動法人 日本歯科放射線学会  

<b>Objective</b>: In order to establish a response indicator for predicting the treatment effects of oral appliances in patients with obstructive sleep apnea syndrome, we examine the utility of synchronous real-time dynamic ultrasound monitoring of the motion of the hyoid bone and the mandibular condyle during anterior mandibular movement.<br><b>Materials and methods</b>: Eight healthy volunteers, including three females and five males, were recruited for this study. None of the subjects had a history of sleep-related disorders. The synchronous real-time dynamic monitoring of mandibular protrusion was performed using two ultrasound systems with dedicated intraoperative probes. We measured five consecutive movements of the lateral portion of the mandibular condyle as an indicator of the anterior movement of the mandible and five consecutive movements of the lateral edge of the hyoid body as an indicator of the caudal movement of the hyoid bone.<br><b>Results</b>: The variation coefficient of the response ratio, which was defined as the ratio between hyoid caudal movement and mandibular anterior movement, was smaller than the amount of hyoid caudal movement in every subject. The mean amount of hyoid movement ranged from 2.0mm to 9.0mm, and the mean response ratio ranged from 0.28 to 0.87. The mean variation coefficient ranged from 5.2% to 19.5% for hyoid movement and from 4.6% to 16.1% for the response ratio.<br><b>Conclusion</b>: It was speculated that interpersonal comparisons could be performed using representative individual response ratio values as an indicator of the treatment effects of oral appliances.

DOI： 10.11242/dentalradiology.56.64

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Most cases of hypophosphatasia (HPP) exhibit early loss of primary teeth. Results of microcomputed tomography (micro-CT) analysis of teeth with HPP have rarely been reported. The purpose of the present study was to describe the mineral density distribution and mapping of exfoliated teeth from an HPP patient using micro-CT. Four exfoliated teeth were obtained from a patient with HPP. Enamel and dentin mineral densities of exfoliated teeth were measured on micro-CT. The mean values of enamel and dentin mineral densities in mandibular primary central incisors with HPP were 1.61 and 0.98 g/cm3, respectively. The corresponding values in the mandibular primary lateral incisors were 1.60 and 0.98 g/cm3, respectively. Enamel hypoplasia was seen in the remaining teeth, both maxillary and mandibular primary canines and first and second molars. Micro-CT enables nondestructive, noninvasive evaluation and is useful for studying human hard tissues obtained from patients.

PubMed

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記述言語：日本語   出版者・発行元：(NPO)日本歯科放射線学会  

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記述言語：日本語   出版者・発行元：新潟歯学会  

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記述言語：日本語   出版者・発行元：(NPO)日本口腔科学会  

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記述言語：日本語   出版者・発行元：(NPO)日本顎変形症学会  

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記述言語：日本語   出版者・発行元：(NPO)日本歯科放射線学会  

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開催年月日： 2021年5月

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