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In Vitro Performance of Different Universal Adhesive Systems on Several CAD/CAM Restorative Materials After Thermal
L F Alegría-Acevedo1, M F Gutiérrez2, J Perdigão3
1Luisa F Alegria-Acevedo, DDS, MS, PhD, Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa, Paraná, Brazil.
Operative Dentistry
|February 28, 2022
Summary
Universal adhesives show varied microshear bond strength (mSBS) on CAD/CAM materials, with most experiencing significant reduction after thermal aging. Performance differs greatly depending on the specific ceramic or composite used.
Area of Science:
- Dental Materials Science
- Adhesive Dentistry
- Biomaterials Engineering
Background:
- CAD/CAM technology has revolutionized dental restorations.
- Universal adhesives offer simplified application protocols.
- Assessing the long-term stability of universal adhesives on diverse CAD/CAM materials is crucial.
Purpose of the Study:
- To compare the microshear bond strength (mSBS) of ten universal adhesive systems.
- To evaluate bond strength on five distinct CAD/CAM materials.
- To determine the effect of thermal aging on bond durability.
Main Methods:
- Five CAD/CAM materials were tested: feldspathic ceramic, resin composite, leucite ceramic, lithium disilicate, and zirconia.
- Ten universal adhesives were applied following manufacturer instructions.
- Microshear bond strength was measured immediately and after 10,000 thermal cycles.
Main Results:
- Significant variations in mSBS were observed across universal adhesives and CAD/CAM materials.
- Some universal adhesives (e.g., AMB, FBU, SBU, OCU, PUB) maintained bond strength on specific materials after thermal aging.
- Negative control (XEN) and PBE showed the lowest bond strength and greatest reduction after thermal aging.
Conclusions:
- The performance of universal adhesives is highly material-dependent.
- Most universal adhesives exhibit a statistically significant reduction in bond strength after thermal aging.
- Clinical longevity of CAD/CAM restorations bonded with universal adhesives may vary.
