Fatigue resistance of the bond of a glass-infiltrated alumina ceramic to human dentin
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Data
2006-05-09
Autores
Baldissara, Paolo
Valandro, Luiz Felipe
Monaco, Carlo
Ferrari, Marco
Bottino, Marco Antonio [UNESP]
Scotti, Roberto
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Resumo
Purpose: To evaluate the fatigue resistance of the bond between dentin and glass-infiltrated alumina ceramic, using different luting protocols. Materials and Methods: The null hypothesis is that the fatigue resistance varies with the luting strategy. Forty blocks of In-Ceram Alumina were prepared, and one surface of each block was abraded with 110-μm aluminum oxide particles. Then, the blocks were luted to flat dentin surfaces of 40 human third molars, using 4 different luting strategies (luting system [LS]/ceramic surface conditioning [CSC]) (n=10): (G1) [LS] RelyX-Unicem/[CSC] airborne abrasion with 110-μm Al2O3 particles; (G2) [LS] One-Step + Duo-Link (bis-GMA-based resin)/[CSC] etching with 4% hydrofluoric acid + silane agent; (G3) [LS] ED-Primer + Panavia F (MDP-based resin)/[CSC] Al2O 3; (G4) [LS] Scotchbond1+RelyX-ARC (bis-GMA-based resin)/[CSC] chairside tribochemical silica coating (air abrasion with 30-μm SiO x particles + silane). After 24 h of water storage at 37°C, the specimens were subjected to 106 fatigue cycles in shear with a sinusoidal load (0 to 21 N, 8 Hz frequency, 37°C water). A fatigue survivor score was given, considering the number of the fatigue cycles until fracture. The failure modes of failed specimens were observed in a SEM. Results: G3 (score = 5.9, 1 failure) and G4 (score = 6, no failures) were statistically similar (p = 0.33) and had significantly higher fatigue resistance than G1 (score = 3.9, 5 failures) and G2 (score = 3.7, 6 failures) (p < 0.03). SEM analysis of fractured specimens of G1 and G2 showed that almost all the failures were between ceramic and cement. Conclusion: The MDP-based resin cement + sandblasting with Al2O3 particles (G3) and bis-GMA-based resin cement + tribochemical silica coating (G4), both using the respective dentin bonding systems, were the best luting protocols for the alumina ceramic. The null hypothesis was confirmed.
Descrição
Palavras-chave
Alumina ceramic, Fatigue resistance, Luting systems, Tribochemical silica coating, aluminum oxide, bisphenol A bis(2 hydroxypropyl) ether dimethacrylate, dentin bonding agent, Duo Link, Duo-Link, ED Primer II, glass, hydrofluoric acid, In Ceram, In-Ceram, macrogol derivative, methacrylic acid derivative, One Step dentin bonding system, One-Step dentin bonding system, Panavia Fluoro, Panavia-Fluoro, polymethacrylic acid derivative, Rely X Unicem, RelyX ARC, resin cement, silane derivative, silicon dioxide, tooth cement, ceramics, chemistry, dental acid etching, dental bonding, dental surgery, dentin, human, materials testing, mechanical stress, methodology, scanning electron microscopy, scotchbond, surface property, tooth prosthesis, ultrastructure, Acid Etching, Dental, Air Abrasion, Dental, Aluminum Oxide, Bisphenol A-Glycidyl Methacrylate, Ceramics, Dental Bonding, Dental Cements, Dental Porcelain, Dentin, Dentin-Bonding Agents, Glass, Humans, Hydrofluoric Acid, Materials Testing, Methacrylates, Microscopy, Electron, Scanning, Polyethylene Glycols, Polymethacrylic Acids, Resin Cements, Silanes, Silicon Dioxide, Stress, Mechanical, Surface Properties
Como citar
Journal of Adhesive Dentistry, v. 8, n. 2, p. 97-104, 2006.