Effect of resin cement space on the fatigue behavior of bonded CAD/CAM leucite ceramic crowns
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Data
2020-10-01
Autores
Venturini, Andressa Borin
Wandscher, Vinícius Felipe
Marchionatti, Ana Maria Estivalete
Evangelisti, Edoardo
Ramos, Gabriela Freitas [UNESP]
Melo, Renata Marques [UNESP]
May, Liliana Gressler
Baldissara, Paolo
Valandro, Luiz Felipe
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Resumo
This study evaluated the influence of occlusal resin cement space on the fatigue performance of bonded-leucite crowns to a dentin-analogue material. Leucite anatomical crowns were adhesively cemented to dentin-like preparations having distinct occlusal cement space (50, 100 and 300 μm) (n = 18), and subjected to step-stress fatigue testing (150 N – 350 N; step-size: 25 N; 20,000 cycles/step; 20 Hz). Fatigue data (load and number of cycles for failure) were analyzed using Kaplan–Meier and Mantel–Cox (log-rank) tests (p <0.05). Fractographic analysis and occlusal internal space measurements were also performed. There was no significant difference for the distinct occlusal cement layer (50 μm: 289 N, 136,111 cycles; 100 μm: 285 N, 132,778 cycles; 300 μm: 246 N, 101,667 cycles). Occlusal internal space analysis showed a mean thickness of 120.4 (50 μm), 174.9 (100 μm) and 337.2 (300 μm). All failures were radial cracks originating at the ceramic-cement interface. Distinct occlusal cement spaces had no effect on the fatigue behavior of anatomical leucite crowns.
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Cement thickness, Fatigue test, IPS Empress CAD, Radial crack, Survival probability
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Journal of the Mechanical Behavior of Biomedical Materials, v. 110.