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Biomedical subjects

G T Clark

Publications and source records attributed to G T Clark.

116 records · Page 7Linked to original sources
PubMed1979

Nocturnal electromyographic evaluation of myofascial pain dysfunction in patients undergoing occlusal splint therapy.

Twenty-five patients with symptoms of myofascial pain and abnormal jaw function were treated with use of a full arch maxillary occlusal splint. The level of nocturnal activity of the masseter muscle was monitored as were symptoms before, during, and after occlusal splint therapy. A decreased nocturnal EMG level during treatment was noted for 52% of the patients. A return to pretreatment EMG levels after removal of the splint was noticed in 92% of the patients; in 28% no change was shown and in 20%, an increase was shown in nocturnal EMG levels. The splint was most likely to reduce nocturnal EMG levels in patients with least severe symptoms.

Adult↗
PubMed1975

Nocturnal electromyographic evaluation of bruxism patients undergoing short term splint therapy.

Eight confirmed bruxist subjects were investigated using portable electromyographic equipment. Nocturnal masseteric muscle activity, as measured by electromyography, was reduced immediately following the insertion of a full arch maxillary stabilization splint. It remained low until the splints were removed, at which time all but one subject's EMG values returned to pretreatment levels. Although the short-term spling therapy did not show a permanent reduction in EMG levels, a dramatic reduction has been demonstrated during treatment.

Adult↗
PubMedDate not supplied

A preliminary report on continuous recording of salivary pH using telemetry in an edentulous patient.

PURPOSE: This study reports on the development and evaluation of a telemetry system for recording salivary pH. MATERIALS AND METHODS: The system used an iridium-oxide pH sensor (Metoxy sensor) and was housed inside a mandibular complete denture. It transmitted the data using the AM band (radio frequency of 12.3 MHz) and had a maximum power output of approximately 1 mW with a 3-V lithium battery (capacity 190 mAh). For the clinical evaluation, a 69-year-old woman who was edentulous and had no systemic disease was the subject. RESULTS: Under the conditions of the study, the system was able to operate for 19 hours. The maximum error of transmitted pH data values was pH 0.15 within the range from pH 5.0 to 9.0. The evaluation of the test subject showed that this system operated without problems, and that the pH levels responded appropriately. CONCLUSION: The developed system was shown to successfully record salivary pH, and it functioned as expected in a single test subject.

Aged↗
PubMedDate not supplied

The incidence of parasomnias in child bruxers versus nonbruxers.

Bruxism in children has been reported to occur in association with certain parasomnias (i.e., sleep talking, bed wetting). Various dental, medical, neurological, and psychological risk factors also have been correlated with bruxism. A case-control study was therefore conducted to test the null hypothesis that there is no difference between bruxers and nonbruxers in the occurrence rate of other parasomnias and these reported risk factors. A 54-item survey questionnaire was developed and mailed to 342 pediatric patients, half of whom were avowed to be bruxers by their parents. These patients were selected randomly from a private pediatric practice in Northern California. One-hundred fifty-two subjects (77 bruxers and 75 controls) returned the questionnaire, and stepwise logistic regression analysis revealed that five of the 54 factors (nocturnal muscle cramps, bed wetting, colic, drooling while sleeping, and sleep talking) showed significant differences between bruxers and controls (odds ratios ranged from 3.11 to 1.95). These findings strongly suggest the possibility of a common sleep disturbance underlying these nonsleep-stage specific parasomnias.

Adolescent↗