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<p>Impression materials for fixed restorations<br>Major Jennifer V. Sabol, DC, USA &amp; Captain John A. VanDercreek, DC, USN<br><br>Introduction<br>A variety of impression materials exists in order to capture the surface detail and dimensions of hard and soft tissues. The accuracy of an impression material is significant because it is essential for the fabrication of a well fitting removable and fixed prosthesis. Some current materials were developed from non-dental-related fields, such as materials created as alternatives to natural rubber or agar during World War II. To achieve a successful fixed impression, many factors must be considered, such as preparation design, location of margins, tissue retraction, fluid control, tray shape and design, and impression material. Today’s impression materials can be evaluated on multiple levels, to include fluidity, set time, distortion, dimensional stability, biocompatibility, number of pours for the impression, and cost effectiveness. The purpose of this update is to discuss different impression materials commonly used for fixed prostheses.
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<br>Subjects: Dental Impression Technique; Prostheses and Implants; Rubber</div>
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U.S. Navy. Naval Postgraduate Dental School</div>
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