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Biomedical subjects

H Vinard

Publications and source records attributed to H Vinard.

11 recordsLinked to original sources
PubMed1979

Electrophysiological properties of human dental pulp cells.

Resting membrane potentials and electrotonic potentials of human dental pulp cells (peripheral and inner cells) were recorded from intracellular measurements. The results show a high resting membrane potential (- 80 mV) for peripheral cells and a low resting membrane potential (- 30 mV) for inner cells. The peripheral cells present rectification properties (outward going rectification and delayed rectification) and a negative post potential at the end of the depolarizing current. These properties are similar to those found in some receptor cells. On the basis of their morphological characteristics, these peripheral cells are compared to odontoblasts in their early stage of development.

Adolescent↗
PubMedDate not supplied

[The psychosomatic effect of the sonic environment in the dental office].

Electrophysiologic recordings of certain neurovegetative manifestations produced by a sonic environment in the dental office, were able to demonstrate and evaluate the stressing and relaxing power of noise or music. The high speed and the telephone represent the most stressing elements in the dental office and show an intense electrodermal activity and respiratory disturbances (a decrease in the magnitude and specially an increase in the inspiratory frequency) characteristic of anxiety, stress and all emotional states. This neurovegetative manifestations are induced in the same way by dissonic music, irregular rhythms and aggressive sounds. On the contrary slow, regular melodious and harmonious music such as J. S. BACH's "Aria", induce a subjective and relaxing climate with neurovegetative reaction characteristic of a state of physiologic relaxation. Some correlations exist between different components of the character and the intensity of the neurovegetative reactions.

Adult↗
PubMedDate not supplied

[Diazepam (valium) in premedication. Experimental findings].

The anxiolytic and analgesic effects of 10 mg of orally administered diazepam (Valium) were assessed on 10 volunteers. The electrodermal activity was recorded during two experimental sessions while cutaneous electrical stimulations were administered to the subjects. On one hand, the anxiolytic activity of diazepam could be observed by a decrease of both autonomic nervous system and anticipatory activities. On the other hand, an increase of the pain threshold could be shown under diazepam by lower responses to the stimulations. These results confirm that diazepam can be useful in anxious patients undergoing dental procedures.

Administration, Oral↗
PubMedDate not supplied

Analgesic property of white noise: an experimental study.

The analgesic property of white noise was assessed in 100 healthy volunteer students. Each of them was asked to self administer electrical square wave impulses in order to determine 3 physiological parameters of pain sensation: perception threshold, pain threshold and pain tolerance. These measurements were first performed without any acoustic stimulation and then with a 100 dB white noise. The results showed that the 3 thresholds were significantly increased under white noise. However, the relatively lower average increase obtained for pain threshold and tolerance compared to the perception level, and the great variability of the analgesic efficiency of white noise among subjects, show that this analgesic process is not reliable enough to be useful in medical or dental practice.

Acoustic Stimulation↗
PubMedDate not supplied

Influence of sex and anxiety on pain threshold and tolerance.

The influence of sex and anxiety on experimental pain perception was studied in a homogeneous population of 50 volunteer and healthy dental students. Three threshold (minimum perceptible threshold, pain threshold and pain tolerance threshold) were determined by delivering electrical stimulations, at regular intervals, on the left hand finger pads. At the same time, the students were asked to complete the Cattell's anxiety test, so allowing their degree of anxiety to be quantified. Statistical analysis of the results showed a lower pain tolerance threshold in females than in males and a significant correlation between the anxiety score and the pain tolerance threshold. The fact that females are more anxious than males could explain these results.

Adult↗