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The properties of polymerizable luting cements
1Dental Biomaterials Department, King's Dental Institute, London, UK. john.nicholson@kcl.ac.uk
Journal of Oral Rehabilitation
|November 17, 1999
Summary
Polyacid-modified composite resin showed slower setting and a strength dip, but met standards. Resin-modified glass-ionomers varied initially but generally maintained strength, except for one material in water. All materials absorbed water.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
- Biomaterials Engineering
Background:
- Luting cements are crucial for dental restorations, requiring specific physical and chemical properties.
- Resin-modified materials offer advantages over traditional cements, but their long-term stability needs evaluation.
- International standards dictate minimum requirements for luting cement performance, including compressive strength.
Purpose of the Study:
- To evaluate the properties of a polyacid-modified composite resin (PMCR) and two resin-modified luting cements (RMLCs).
- To assess setting characteristics, compressive strength over time, and water sorption under various storage conditions.
- To compare material performance against current international standards for luting cements.
Main Methods:
- Materials tested: one PMCR (Dyract-Cem) and two RMLCs (including Vitremer luting).
- Properties evaluated: setting time, compressive strength (24h to 1 year), water sorption, and diffusion coefficients.
- Storage media: deionized water, 0.9% NaCl, and 20 mmol dm(-3) lactic acid.
Main Results:
- PMCR exhibited the slowest setting time, not meeting the international standard.
- PMCR showed a strength decrease at 1 month but was otherwise stable; RMLCs showed initial variation with storage medium.
- All materials exceeded the minimum compressive strength (70 MPa) at 24h in water; water sorption varied, with PMCR absorbing the least.
Conclusions:
- The studied PMCR demonstrated acceptable compressive strength but had processing challenges (viscosity, voids) and slower setting.
- RMLCs showed variable initial strength depending on storage but generally maintained performance, with one exception at 1 year in water.
- All materials absorbed water, influencing their properties, highlighting the importance of considering the storage environment.
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