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Accuracy of a New Fast-Setting Polyether Impression Material.

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Area of Science:

Dental materials science
Prosthodontics
Digital dentistry

Background:

Accurate dental impressions are crucial for fabricating well-fitting restorations.
Polyether materials are known for their accuracy but can have longer setting times.
Advancements in dental materials aim to improve handling properties without compromising accuracy.

Purpose of the Study:

To evaluate the dimensional accuracy of a new fast-setting polyether (FSP) impression material.
To compare the accuracy of FSP with a regular-setting polyether (RSP) material.
To assess the influence of monophase and dual-phase techniques on impression accuracy.

Main Methods:

A metallic reference model was digitized to create a digital reference.
One-step impressions were made using RSP and FSP materials in monophase and dual-phase techniques (n=16 per group).
Plaster casts were digitized, and global and local accuracy (trueness and precision) were analyzed against the reference model.

Main Results:

Excellent local accuracy (trueness < 10 μm, precision < 12 μm) was observed for crown preparations with both materials.
Inlay preparations showed higher inaccuracies (trueness < 21 μm, precision < 37 μm).
Fast-setting polyether (FSP) material performance was comparable to regular-setting polyether (RSP) across all evaluated aspects.

Conclusions:

All tested polyether materials, including the new FSP, provide clinically acceptable dimensional accuracy.
The fast-setting polyether material is a suitable alternative to regular-setting polyether, particularly for single crowns and small FPDs.
The choice between FSP and RSP may depend on clinical convenience and specific case requirements.