What is the water-to-powder ratio for taking a maxillary impression? What does the prefix “hydro-” mean? Do you mix irreversible hydrocolloid on a paper pad or in a mixing bowl?  Before an impression...

What is the water-to-powder ratio for taking a maxillary impression? What does the prefix “hydro-” mean? Do you mix irreversible hydrocolloid on a paper pad or in a mixing bowl?  Before an impression is taken with reversible hydrocolloid, where is the material kept?