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Microhardness of provisional fixed prosthodontic materials.
A M Diaz-Arnold1, J T Dunne, A H Jones
1College of Dentistry, University of Iowa, Iowa City 52245, USA. ana_arnold@uiowa.edu
The Journal of Prosthetic Dentistry
|November 24, 1999
Summary
Bis-acryl resin composites demonstrate superior microhardness compared to methyl methacrylate resins in provisional restorations. Material hardness generally decreased over 14 days, highlighting the importance of material selection for long-term success.
Area of Science:
- Dental Materials Science
- Prosthodontics
Background:
- Provisional restorations are crucial for successful restorative treatment.
- Maintaining surface integrity of provisional restorations is essential throughout the treatment process.
Purpose of the Study:
- To evaluate and compare the microhardness of five different prosthodontic provisional materials.
- Assess the impact of material type on surface integrity.
Main Methods:
- Fabrication of cylindrical samples from three bis-acryl resin composites and two methyl methacrylate acrylic resins.
- Wet-sanding of specimens and storage in artificial saliva at 37°C for 14 days.
- Measurement of Knoop hardness (KHN) at baseline and after 14 days of storage.
Main Results:
- Significant differences in microhardness were observed between bis-acryl resin composites and methyl methacrylate resins at both time intervals.
- ANOVA and Duncan's tests confirmed statistically significant variations (P<.05).
Conclusions:
- Bis-acryl resin composites exhibited superior microhardness compared to methyl methacrylate resins.
- The hardness of most tested materials, including Integrity, Protemp Garant, and Jet, decreased over the 14-day storage period.
- Material selection is critical for ensuring the durability of provisional restorations.