Internal adjustments decrease the fatigue failure load of bonded simplified lithium disilicate restorations

Dental Materials : Official Publication of the Academy of Dental Materials
Camila da Silva RodriguesL F Valandro

Abstract

To investigate the effect of intaglio surface adjustment of simplified lithium disilicate ceramic restorations adhesively cemented to a dentin-like material on its fatigue behavior. Ceramic discs (IPS e.max CAD) were prepared and an in-Lab simulation of machining roughness was performed by grinding with SiC paper (#60). Ceramic discs were divided into 4 groups according to the internal adjustment of the cementation surface: no adjustments (CTRL); adjustment with a medium (M), fine (F), or extra fine (FF) diamond bur. Dentin-like material discs were also produced. Ceramic disc intaglio surfaces were etched (5% hydrofluoric acid; 20s) and received a silane coating. Dentin-like material discs were etched (10% hydrofluoric acid; 1min) and received a primer coating. Pairs of ceramic/dentin-like material were adhesively cemented (Multilink Automix), and fatigue failure load tests were performed using the Staircase approach (250,000 cycles; 20Hz). Roughness, topographic and fractographic analyses were performed. Statistical analyses were carried out through ANOVA tests. All ground groups (M=521.3 N; F=536.9 N; FF=676.2 N) presented lower fatigue failure load values than the control (1241.6 N). M diamond bur created a rougher surface t...Continue Reading

Citations

Nov 27, 2019·Journal of the Mechanical Behavior of Biomedical Materials·Guilardi LfValandro Lf
Jun 5, 2021·Journal of the Mechanical Behavior of Biomedical Materials·Rafaela Oliveira PileccoMarília Pivetta Rippe
Nov 25, 2021·Journal of Applied Biomaterials & Functional Materials·Sarah S Al-AngariNadia S Al-Angari

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