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Biomedical subjects

Y Amemori

Publications and source records attributed to Y Amemori.

7 recordsLinked to original sources
PubMed2005

The comparison between pains, difficulties in function, and associating factors of patients in subtypes of temporomandibular disorders.

The aim of this study was to compare the multidimensional properties among subtypes of painful temporomandibular disorders (TMD): myofascial pain (group I), disc displacement (group II), arthralgia (group IIIa) and osteoarthritis (group IIIb). A total of 511 patients answered a battery of questionnaires, which included questions relating to intensity and duration of pain, the Japanese version of the McGill Pain Questionnaire, limitation of daily functions, the Hospital Anxiety and Depression Scale, the Eysenck Personality Questionnaire short-form and 34 items of behavioural contributing factors. Group IIIb showed significantly the highest age in all subtypes. Those in group I had higher depression scores than those in group II (P = 0.005). Group IIIa had a lower women's ratio than in group II (P = 0.001) and the patients showed a shorter pain duration than those in groups I (P = 0.000) and II (P = 0.001). Group IIIa patients also showed lower visual analogue scale (VAS) ratings for pain descriptors 'heavy' (P = 0.002) and 'tiring' (P = 0.004) than those of group I, and 'dull' (P = 0.005), 'heavy' (P = 0.001) and 'tiring' (P = 0.005) than those of group II. Group IIIa showed lower ratios of contributing factors of 'an awareness of grinding/clenching during sleep' (P = 0.000) and 'an awareness of clenching sensation when waking up at night' (P = 0.002) than those of group I, and also showed a higher ratio of 'a liking for a hard food' (P = 0.000) and lower ratio of 'talking for a long time on the telephone' (P = 0.001) than those of group II. In conclusion, although several properties were different between subtypes, the majority of them were similar in the four subtypes of TMD.

Activities of Daily Living↗
PubMed2001

Influence of nocturnal bruxism on the stomatognathic system. Part I: a new device for measuring mandibular movements during sleep.

The purpose of this study was to investigate the influence of bruxism on the stomatognathic system. A new device for measuring nocturnal mandibular movements was developed using a PIN photodiode sensor, integrated with polysomnography including electromyography (EMG), electroencephalography (EEG) and electro oculography (EOG). One bruxing event was defined depending upon EMG activities above 5% maximum voluntary contraction (MVC), and mandibular movement for each event was classified into three patterns (clenching, grinding and mix). Three subjects were selected for this study. Two of these reported a bruxing habit and one subject had some symptoms of temporomandibular dysfunction (TMD). Mandibular movement was analysed for these subjects. Frequency and duration of the bruxism events were 4.5-10.9 and 47.8-174.9 s h(-1) respectively. Clenching type bruxism was most frequently observed for all three subjects and EMG activities during clenching were stronger than grinding.

Adult↗
PubMed1999

[Influence of bruxism during sleep on stomatognathic system].

Nocturnal tooth contact such as bruxism has been considered to be one of the major factors of temporo-mandibular disorders (TMD). However, little information has been reported regarding mandibular movements during bruxing, because of the limitation of the measuring method. The purpose of this study was to investigate the influence of bruxism on the stomatognathic system. A new device for measuring nocturnal mandibular movements was developed using a PIN photodiode sensor, which was integrated with the polysomnography including both masseter and anterior temporal EMG. The maximum error of the system was revealed to be less than 0.2 mm. One episode was defined depending upon EMG activities above 5% MVC, and mandibular movement for each episode was classified into 3 patterns (Clenching, Grinding, and Mixed). Nine subjects were selected for the study. Two of them reported bruxing habits and one subject had some symptoms of TMD. Mandibular movement was analyzed only for these three subjects. Frequency and duration of the episode were 3.8-10.9 and 47.8-174.9 sec per hour, respectively. The values of two bruxism patients was high, comparing to the other seven subjects. Clenching pattern during "Mixed movement" was most frequently observed for all three subjects, and EMG activities during clenching were stronger than those during grinding. These findings suggested that tooth clenching during sleep may be harmful to the stomatognathic system, rather than other mandibular movements.

Adult↗