Testig the hardness of pink wax in the temperature intervals important for wax-silicon impression methods

摘要

With a modified instrument for the testing bitumen hardness the authors have tested the hardness of the commercial pink wax in a number of temperature intervals ranging from 10CC to 30°C. This range, especially that about 20°C, is important in the prosthetic clinical proctice when the impression wax is used in combination with the elastomeres. It was found that this range is the most critical and that the pink wax produced in our country is most quickly-hardened when cooled between 19°C and 22°C. Therefore this range must be avoided by means of undercooling. Addition of the stearine acid 0,25% — 0,50% to the pink wax significantly improves its hardness properties.