2020 Volume 51 Issue 2 Pages 144-147
Threshold values calculated from the triangle odor bag method were compared among three suction methods, those were the self-suction method, the discharge-suction method and the cannula method. The tendency of threshold values was almost same in the point of view of both the concentration and the proficiency effect of three trials between the discharge-suction method and the self-suction method. The cannula method was not suitable because of the odor from cannula material or the friction drag of tube. For improvement, it is necessary to use a cannula which is made of a low odor material and has a short tube and a large cross-sectional area.
