A control cylinder (available at company Dentaurum) can be used to check the expansion values.

Important hints in order to achieve a precision fit:

• handling of the resin
• working temperature of powder and liquid (20 – 22° C)
• precise mixing ratio of powder and liquid
• constant mixing times
• muffle system (with metal ring, ring-free, ring size 3 or 6)
• speed preheating or conventional preheating
• investing under pressure (higher concentration of the liquid)
• components of the alloy
• diameter, length and wall thickness of the crowns (in case of narrow dies or thick crown walls increase the concentration of the mixing liquid)