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Accuracy of alginate and elastomeric impression materials.
1Department of Dental Materials and Technology, Royal Dental College, Copenhagen, Denmark.
Scandinavian Journal of Dental Research
|August 1, 1989
Summary
This study evaluated dental impression materials, finding all showed shrinkage. Blueprint regular alginate and specific elastomeric materials like Baysilex and President demonstrated superior accuracy for dental impressions.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
Background:
- Accurate dental impressions are crucial for prosthodontic restorations.
- Material properties like dimensional stability influence clinical outcomes.
Purpose of the Study:
- To compare the accuracy of alginate and elastomeric impression materials.
- To identify materials with superior dimensional stability for dental applications.
Main Methods:
- Impressions of a truncated cone were made using three alginates and seven elastomeric materials.
- Stone dies were poured, and discrepancies were measured using a steel ring.
- Accuracy was quantified by calculating the deviation between die and cone base diameters.
Main Results:
- All tested materials exhibited shrinkage, leading to oversized dies.
- Alginate inaccuracy ranged from 44 to 188 microns; Blueprint regular was most accurate.
- Elastomeric material inaccuracy ranged from 39 to 130 microns.
- Addition-curing silicones generally outperformed polyethers.
- Baysilex and President regular body showed the highest accuracy among elastomers.
Conclusions:
- Material shrinkage is a significant factor affecting die accuracy.
- Blueprint regular alginate offers accuracy comparable to some elastomeric materials.
- Baysilex and President regular body are recommended for high-accuracy dental impressions.