ASPEN Dental Assisting Practice Exam 2026 - Free Dental Assisting Practice Questions and Study Guide

Alginate impressions are used primarily for preliminary impressions because they’re fast, inexpensive, and easy to use, providing a quick diagnostic model for planning treatment. They produce a material that captures enough detail to study the arches, evaluate occlusion, and create study models or temporary trays for further work. However, they aren’t ideal for final crowns because alginate is less dimensionally stable and cannot reproduce fine margin details as accurately as elastomeric impression materials. For final crowns, materials with greater accuracy and stability—or digital scans—are preferred.