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Dimensional accuracy of 7 die materials.
Brian J Kenyon1, Mark S Hagge, Casimir Leknius
1Department of Restorative Dentistry, University of the Pacific School of Dentistry, San Francisco, CA 94115, USA. bkenyon@sf.uop.edu
Summary
Type IV resin-impregnated dental stone and copper-plated dies showed the best dimensional accuracy among seven materials tested. These materials closely matched master die dimensions, outperforming others in this key dental application.
Area of Science:
- Dental materials science
- Prosthodontics
- Manufacturing and material properties
Background:
- Accurate dental dies are crucial for fabricating well-fitting prostheses.
- Evaluating dimensional stability of various die materials is essential for clinical success.
Purpose of the Study:
- To compare the linear dimensional accuracy of seven different die materials.
- To assess the handling characteristics of these die materials.
Main Methods:
- A master die was used to create polyvinylsiloxane impressions for fabricating ten specimens of each die material.
- Dies were measured to the nearest 0.0001 mm using 50x magnification.
- Statistical analysis included ANOVA/Duncan tests and pairwise comparisons at a 0.05 significance level.
Main Results:
- Type IV resin-impregnated dental stone and copper-plated dies exhibited the highest dimensional accuracy, closely approximating master die dimensions.
- These two materials showed no significant difference in pairwise comparisons.
- Conventional Type IV and V dental stones showed appropriate setting expansion, while epoxy resins showed comparable shrinkage. Polyurethane dies had mixed results, and bis-acryl composite resins showed excessive shrinkage.
Conclusions:
- Type IV resin-impregnated dental stone and copper-plated dies are superior in dimensional accuracy compared to the other tested materials.
- These findings support the use of resin-impregnated stone and copper-plated dies for improved prosthodontic outcomes.