Biomaterial Database

Dual-arch and custom tray impression accuracy. 1991

R D Davis, and R S Schwartz

Department of General Dentistry, Wilford Hall USAF Medical Center, Lackland AFB, Texas.

This study compared the accuracy in three dimensions of casts made from complete-arch custom acrylic resin trays and two types of dual-arch impression trays. Using addition silicone impression material, 30 impressions (10/group) were made of a typodont. Reference marks on the typodont allowed measurements in the mesiodistal, buccolingual and occlusogingival dimensions. Gypsum casts were made and the distances between the reference marks on each cast were determined with a measuring microscope. The measurements from each cast were compared with one another and expressed as a percent deviation from the typodont measurements. Analysis with a two-way ANOVA and a Tukey B post hoc test established that the dual-arch trays were at least as accurate as the custom tray in every dimension measured.

UI	MeSH Term	Description	Entries
D003761	Dental Impression Technique	Procedure of producing an imprint or negative likeness of the teeth and/or edentulous areas. Impressions are made in plastic material which becomes hardened or set while in contact with the tissue. They are later filled with plaster of Paris or artificial stone to produce a facsimile of the oral structures present. Impressions may be made of a full complement of teeth, of areas where some teeth have been removed, or in a mouth from which all teeth have been extracted. (Illustrated Dictionary of Dentistry, 1982)	Dental Impression Technic,Dental Impression Technics,Dental Impression Techniques,Impression Technic, Dental,Impression Technics, Dental,Impression Technique, Dental,Impression Techniques, Dental,Technic, Dental Impression,Technics, Dental Impression,Technique, Dental Impression,Techniques, Dental Impression
D003765	Models, Dental	Presentation devices used for patient education and technique training in dentistry.	Dental Models,Dental Model,Model, Dental
D000704	Analysis of Variance	A statistical technique that isolates and assesses the contributions of categorical independent variables to variation in the mean of a continuous dependent variable.	ANOVA,Analysis, Variance,Variance Analysis,Analyses, Variance,Variance Analyses