Dr. Gordon Christensen answers questions from readers and offers his answers based on research, dentists' opinions worldwide, and personal observation.
Dr. Christensen says that a custom, light-cured tray can be modified very, very easily. If you use a stock tray you have to modify with the impression material, whereas a custom tray already fits pretty well, so there is much less to do to make that impression really adequately represent the mouth.
Previously Dr. Christensen answered the question, what is the best technique for complete denture impressions? Watch the video for the answer.