title: The effect of using custom or stock trays on the accuracy of gypsum casts.
abstract: 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.
authors.affiliation: Department of Restorative Dentistry, Loma Linda University School of Dentistry, California 92350, USA.
authors.forename: L J
authors.initials: LJ
authors.lastname: Rueda
authors.forename: J T
authors.initials: JT
authors.lastname: Sy-Muñoz
authors.forename: W P
authors.initials: WP
authors.lastname: Naylor
authors.forename: C J
authors.initials: CJ
authors.lastname: Goodacre
authors.forename: M L
authors.initials: ML
authors.lastname: Swartz
mesh_terms: 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
chemical_list: D003760:Dental Impression Materials; D011145:Polyvinyls; D012833:Siloxanes; C034183:vinyl polysiloxane; D002133:Calcium Sulfate