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Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing
Published on: July 3, 2020
e-Modulus of resin cements as a function of curing source and storage time
M Dutra-Corrêa1, L Alves Cunha, M A M De Araújo
1Department of Restorative Dentistry, Paulista University (UNIP), São Paulo, Brazil.
Minerva Stomatologica
|January 11, 2011
Summary
The e-modulus of resin cements is significantly affected by the curing source and storage time. Light-emitting diode (LED) curing resulted in lower flexural strength compared to quartz-tungsten-halogen (QTH) curing for both tested cements.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
Background:
- Resin cements are widely used in dental restorations.
- Understanding their mechanical properties, such as elastic modulus (e-modulus), is crucial for clinical success.
- Curing methods and aging can influence these properties.
Purpose of the Study:
- To evaluate the e-modulus of two dual-cured resin cements.
- To investigate the impact of different curing sources (QTH vs. LED) on e-modulus.
- To assess the effect of storage time (24 hours vs. 30 days) on e-modulus.
Main Methods:
- Two dual-cured resin cements (Bistite II DC, Panavia F 2.0) were tested.
- Specimens were light-cured using a quartz-tungsten-halogen (QTH) unit and a light-emitting diode (LED) unit.
- Flexural strength was measured after storage periods of 24 hours and 30 days.
Main Results:
- Both cement type, storage time, and curing unit type significantly affected e-modulus.
- QTH curing generally resulted in higher flexural strength compared to LED curing.
- Storage time also influenced the mechanical properties, with variations observed between the two cements.
Conclusions:
- The choice of curing source and the duration of storage significantly impact the e-modulus of dual-cured resin cements.
- These factors must be considered to ensure optimal mechanical performance of resin cements in clinical applications.
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