DISPLACEMENT OF BORDER TISSUES DURING FINAL IMPRESSION PROCEDURES

Two different impression procedures were used to reproduce the maxilla ry tissue form of five edentulous patients. One procedure used modelin g plastic to mold the borders of spaced trays while the tissue contour was recorded with regular-body polysulfide. The second procedure used tissue treatment material to mold the borders of selectively spaced t rays while the impression was completed in light-body polysulfide. Eac h procedure was repeated three times for the same patient. Comparison of the profiles of the casts at premolar and molar coronal sections sh owed that (1) there was no significant difference in results between t he procedures, (2) peripheral tissues were readily displaceable with t he least manipulation, and (3) the second procedure is recommended bec ause of convenience to the patient and time efficiency for the clinici an.