Keywords
Cad/Cam
dental adhesion
dental composite
dental etching
dental materials
dental polymer
dentistry
resin cement
sandblasting
silane
surface treatment
universal adhesive
universal dental adhesive
How to Cite
Abstract
Background: Fractures of oral restorations are inevitable. When they occur, the clinician should be able to repair them in a simple and reliable manner. Purpose: To measure the bond strength (BS) of a CAD/CAM composite when it has been sandblasted or acid-etched. Methods: 50 Brava Block veneers were divided into 5 groups of n=10 and aged at 5000 thermal cycles. 100 resin cylinders of 3 mm diameter were cemented to the veneers. The groups, aluminum oxide (AL10) and aluminum oxide with silane (ALS 10), were sandblasted. The groups, hydrofluoric acid (HF10) and hydrofluoric acid with silane (HFS10) were etched. The group, aluminum oxide plus hydrofluoric acid with silane (AHS) was sandblasted and acid-etched. The cylinders were cemented with resin cement. All groups were sheared on a universal testing machine. Bond failures were analyzed with a light microscope at 40X (p = 0.05). Results: The groups had similar bond strengths. When aged, their values decreased to 11.15 and 8.15 MPa on average. The failures were adhesive (12 ), cohesive (68 %), and mixed (20 %). A higher frequency of cohesive and mixed failures was observed in the sandblasted groups with 80-90 % fractures. Conclusions: Both treatments produced similar FA between a Cad/Cam composite and a resin cement. However, the sandblasted groups suffered a higher percentage of material fractures.
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Copyright (c) 2023 Marcelo Geovanny Cascante-Calderón, Kevin Alejandro Reascos Flores, Inés María Villacís-Altamirano, Anggely Maite Bayas Salinas, Jessica Elizabeth Taraguay Galindo