Abstract
A longitudinal study was conducted on the possible loss of formaldehyde from formocresol mixture that was contained in the glass vial for dental use. The brown-colored vials containing the mixture were divided into 4 groups of A, B, C and D, and these were treated in the following manners for 4 consecutive weeks under room temperature of 5℃ to 15℃. A group……Formocresol was left standing throughout the period. B group……Formocresol was given horizontal agitation. C group……Formocresol was occasionally taken out of the vial by means of cotton pellets. D group……The vials were overturned 20 times and their caps were taken off 4 hours every day. Chromotropic acid method was used for the determimation of formaldehyde left in each vial. The results showed that the concentration of formaldehyde suffered some change. Amount of formaldehyde was most decreased in vials of D group.
