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Surface characterization of indirect restorative materials submitted to different etching protocols
Glívia Queiroz-Lima1, Henrico Badaoui Strazzi-Sahyon2, Ana Teresa Maluly-Proni2
1Department of Preventive and Restorative Dentistry, Araçatuba School of Dentistry, São Paulo State University - UNESP, Araçatuba, SP, Brazil.
Journal of Dentistry
|October 24, 2022
Summary
Optimizing hydrofluoric acid etching for CAD-CAM indirect restorations is crucial. Different materials like Celtra Duo, Lava Ultimate, and Vita Enamic require specific etching times and concentrations for improved bond strength and durability.
Area of Science:
- Dental Materials Science
- Surface Engineering
- Biomaterials
Background:
- CAD-CAM technology enables precise fabrication of indirect dental restorations.
- Surface treatment of restorative materials is critical for achieving durable adhesive bonds.
- Hydrofluoric acid (HF) is commonly used for etching ceramic surfaces.
Purpose of the Study:
- To evaluate the impact of varying hydrofluoric acid concentrations and etching durations on the surface properties of indirect restorative materials.
- To determine the optimal etching parameters for enhancing the bond strength of CAD-CAM materials to resin cement.
- To compare the surface characteristics and mechanical properties of different restorative materials after HF etching.
Main Methods:
- Three CAD-CAM materials (Celtra Duo, Lava Ultimate, Vita Enamic) were etched with 5% or 10% HF for 20-90 seconds.
- Surface roughness, contact angle, surface free energy, and total free interaction energy were measured.
- Microshear bond strength to resin cement was assessed.
- Surface morphology was analyzed using SEM, confocal microscopy, and AFM.
Main Results:
- Celtra Duo performed best with 10% HF for 40-60s; Lava Ultimate with 10% HF for 20-40s; Vita Enamic with 5% HF for 90s.
- Each material exhibited distinct surface changes post-etching.
- Etching parameters significantly influenced surface properties and bond strength.
Conclusions:
- Specific hydrofluoric acid etching protocols are necessary for each indirect restorative material.
- Inappropriate etching can compromise surface integrity, mechanical properties, and bond strength.
- Celtra Duo demonstrated superior mechanical properties compared to Lava Ultimate and Vita Enamic.
