Language：Japanese   Publisher：Archives of Oral Biology  

Objective: This study aimed to investigate the effects of nasal obstruction on the coordinated movement of perioral tissues during mastication using a motion capture system. Design: Twelve healthy adult participants were instructed to chew gum only on their habitual masticatory side for 30 s, with and without nasal obstruction. Nasal obstruction was induced by blocking nasal breathing with a nose clip. Movements of the upper and lower lips, left and right corners of the mouth, and chin during gum chewing were measured using a motion capture system, and the differences between participants with and without nasal obstruction were compared. Multilevel linear model analysis was used to evaluate inter-individual and intra-individual variations in lip and chin movements, both with and without nasal obstruction. Results: The chin chewing cycle duration was significantly longer in participants with nasal obstruction. The chewing cycle distance of the upper lip was significantly shorter in participants with nasal obstruction. The intra-individual variation in the chewing cycle distance of the chin and lips increased with nasal obstruction, whereas the inter-individual variation decreased. Conclusions: Nasal obstruction causes unstable yet uniform movements of the chin and lips during mastication, while also restricting upper-lip movement. Our results indicate that nasal obstruction may significantly affect mandibular and lip movements during mastication. These findings highlight the importance of nasal breathing in maintaining stable perioral movements during mastication. This study provides new insights that could inform clinical strategies for managing oral function in individuals with nasal obstruction.

DOI： 10.1016/j.archoralbio.2025.106181

Scopus

PubMed

Language：Japanese   Publisher：(公社)日本小児歯科学会  

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

成人男性を対象に、さまざまな口腔咽頭活動のタスクを行わせ、複数ヶ所に設置したマイクロフォンにより測定した音声がヒトの耳で判別活動能であるか調査した。臼歯部の咬合支持がある男性12名(20歳代6名、59歳以上6名)を対象に、背もたれのある椅子に座った状態で、1)舌のポッピング、2)オーラルディアドコキネシス(ODK)、3)タッピング、4)左右への歯ぎしり(模擬グラインディング)、5)模擬いびき、6)クレンチング、7)改訂水飲みテスト、8)ガム咀嚼、9)咀嚼・嚥下、10)最大開閉口を行ってもらった。右側外耳孔、右側鼻孔、喉頭隆起、上唇前縁より約10cm話した前方の4個所にマイクロフォンを設置した。その結果、ポッピング、ODK、タッピング、模擬グラインディング、いびき音、水・炭酸嚥下では、どのマイクでも100%聴取可能であった。顎関節雑音を有するものは3名おり、外耳孔では67%、鼻孔では56%、咽頭では0%、非接触型では22%聴取可能であった。部位別に検出できる音声の明瞭度は異なるが、部位特異的に音声の特徴が異なることが明らかとなった。どの音を標的として使用するかによって測定部位は変更した方がよいと考えられるが、ゲイン調整や音の明瞭度の観点から、外耳孔が包括的に収録・解析するのに有利である可能性が示唆された。

Language：Japanese   Publisher：Japanese Society of Stomatognathic Function  

<p></p>

DOI： 10.7144/sgf.30.132

CiNii Research

Language：Japanese   Publisher：Journal of Oral Rehabilitation  

Background: Evaluating mouth rinsing skills is useful for assessing oral function, however current evaluation methods are subjective. Objectives: This study compared mouth rinsing between adults and children using a contactless camera to capture lip motion. Methods: The subjects comprised 16 adults and 13 children with no oral dysfunction. A compact vital sensing camera adapted from a Microsoft Xbox One Kinect Sensor® (Kinect) was placed 100 cm from the floor and 120 cm from the subject; 5, 10 and 15 ml of water were used as samples. Participants were instructed to hold the sample in the oral cavity, close the lips and move the sample alternatively left and right for 15 s. Maximum/minimum displacement from the reference plane and rinsing cycle for each sample were analysed by one-way analysis of variance. Results: In adults, there was no significant difference in the maximum/minimum displacement between the left and right sides of the angulus oris due to differences in sample amount. In children, the right maximum significantly differed between the 5- and 15-ml and 10- and 15-ml samples, while the left maximum significantly differed between the 5- and 10-ml and 5- and 15-ml samples. The right minimum significantly differed between the 5- and 10-ml samples, as did the duration of mouth rinsing between the 5- and 15-ml samples. Conclusions: In children, lip movement and mouth rinsing duration tended to decrease with increasing sample volume. Evaluating lip movement using a contactless vital sensing camera is useful for assessing children's development of oral function.

DOI： 10.1111/joor.13379

Scopus

PubMed

Language：Japanese  

Language：Japanese  

Language：Japanese  

Language：Japanese