Sometimes there are small air bubbles beneath the surface of the model. After adding acrylic under pressure the air bubbles are punched into. These nodules of acrylic are sure sore spots. Some students will gently brush a ball of cotton or gauze over the surface looking for areas where the material is snagged.

Occasionally the patient has grooves in their tissue. This is picked up in the impression resulting in sharp projections of acrylic which filled the grooves. Carefully round these off because they will cut just like a serrated knife blade.

©1999 by Julius Rosen, D.D.S.