Effect of Hydrofluoric Acid Etching Time on Flexural Strength and Surface Roughness of CAD/CAM Ceramic Materials
DOI:
https://doi.org/10.35516/jmj.v59i1.2602Keywords:
Flexural, Strength, Surface Roughness, Ceramic Materials, Dental RestorationsAbstract
Objective: This study emulated the influences of varied hydrofluoric acid etching durations on the flexural strength and surface roughness of three CAD/CAM dental glass ceramic materials: feldspathic—CEREC blocs CPC, leucite-reinforced—IPS Empress CAD, and lithium disilicate—IPS e.max CAD.
Methods: The samples were prepared and divided with respect to the type of material to be etched for 0, 20, 60, and 90 seconds. This was followed by ultrasonic cleaning and successive thermocycling. SR and FS were measured with the profilometer and by the 3-point bending test, respectively. Data were statistically analyzed using ANOVA.
Results: The results indicated that increasing HF etching time significantly reduced the FS of the lithium disilicate group only, thus being dependent on material composition, p < 0.05. In all materials, SR increased with longer etching time. This increase in SR with deeper etching therefore places a direct relationship between etching time and surface texture.
Conclusion: This paper points out that one of the most critical factors in regard to the optimization of mechanical properties in ceramic materials for dental restorations is HF etching time. The choice of appropriate etching times relative to what exists is essential for the ultimate clinical performance and lifetime of ceramic restorations, with chosen durations favoring specific materials over others. This information is very valuable for dental practitioners in making appropriate choices toward durability and reliability in ceramic dental restorations.
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