口臭の官能試験法に関する基礎的研究

臭気濃度表示法による

抄録

At present, the sensory evaluation is considered to be the most adequate method to assess various bad smells or odors and, for this reason, along with advances in the technique of analyzing the odorous constituents a more effective sensory evaluation method is being developed. The disadvantages which are often pointed out in connection with the sensory evaluation method include the influence of atmospheric conditions, individual difference and the difficulty of conversing the result into numerical data.
To make good these disadvantages, many studies have been carried out to date and the effectiveness of an odor concentration method is currently being confirmed.
In the present study, the author was concerned with a three-fold indication method of the odor concentration concerning the halitosis that is clinically encountered and, at the same time, the category scale which is used today was examined for its evaluative validity.
By way of the study material, a selective use was made of 62 subjects who were judged by a screening panel of 4 dentists as suffering from the halitosis. They wrer subjected to a three-fold indication by means of i) syrings technique, ii) olfacto-meter and iii) triangle test, for the purpose of finding out the odor concentration and coefficient of variation through the dilution method.
The hedonic value and odor intensity were measured of each category and were carefully analyzed.
As a result of the study, the author arrived at the conclusions as follows:
1) At a risk rate of under 1%, the measurement results were greater in order of the tirangle test, syringe technique and lofacto-meter.
As for the coefficient of variation, the result of the syringe technique was greater than that of either the olfacto-meter or triangle test at a risk rate of under 5%.
Thus, there was observed a tendency of a large dispersion among the panel judges.
2) There were computed correlations between the scores assigned to the odor intensity and hedonic value.
Similarly, correlations were computed among the scores assigned to the odor concentration, odor intensity and hedonic value.
3) There was found a definite tendency that changes in the odor concentration, attendant upon the upgrading the category scale, increased by two times in proportion to a step upward in the category scale.