The effect of using custom or stock trays on the accuracy of gypsum casts.
This study examined the linear dimensional stability of nonaqueous elastomeric impressions made from stock and custom trays by measuring casts derived from those impressions at 1 hour, 1 day, and 1 week. There was a small statistical difference among casts produced from stock versus custom trays compared to the master model. However, there was no significant difference in casts produced from impressions poured at 1 hour, 1 day, and 1 week. A custom tray with a 2.0 to 2.5 mm tray spacing had the least amount of variation, yet the differences between custom and stock trays may not be clinically significant.
Rueda
L J
LJ
Department of Restorative Dentistry, Loma Linda University School of Dentistry, California 92350, USA.
Sy-Muñoz
J T
JT
Naylor
W P
WP
Goodacre
C J
CJ
Swartz
M L
ML
D000704:Analysis of Variance; D002133:Calcium Sulfate; D003760:Dental Impression Materials; D003761:Dental Impression Technique / Q000295:instrumentation*; D005069:Evaluation Studies as Topic; D003765:Models, Dental; D011145:Polyvinyls; D015203:Reproducibility of Results; D012833:Siloxanes; D013997:Time Factors
D003760:Dental Impression Materials; D011145:Polyvinyls; D012833:Siloxanes; C034183:vinyl polysiloxane; D002133:Calcium Sulfate