Using double-poured alginate impressions to fabricate bleaching trays

Area of Science:

• Dental Materials Science
• Prosthodontics
• Clinical Dentistry

Background:

• Diagnostic and esthetic dental treatments frequently require multiple casts of a single arch.
• Creating duplicate casts typically involves taking separate impressions, which can be time-consuming and resource-intensive.

Purpose of the Study:

• To compare the accuracy of dental stone casts made from a second pour of an alginate impression versus first-poured casts.
• To determine if a single alginate impression can yield two accurate casts for clinical use.

Main Methods:

• Alginate impressions of a maxillary dentoform were made and stored in a moist environment.
• Impressions were poured once for Group A casts, then repoured for Group B casts.
• Control Group C casts were poured from separate impressions, with measurements taken using a dial caliper.

Main Results:

• No statistically significant difference in accuracy was found between the first-poured casts (Group A), second-poured casts (Group B), and control casts (Group C).
• The accuracy of the stone casts was maintained when the alginate impression was properly handled and repoured within 45 minutes.

Conclusions:

• Two accurate stone casts can be generated from a single, properly handled alginate impression.
• This technique offers a viable alternative for obtaining multiple casts, enhancing efficiency in dental procedures.