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Type: Artigo de Periódico
Title: Heat Treatment-improved Bond Strength Of Resin Cement To Lithium Disilicate Dental Glass-ceramic
Author: Sundfeld
D; Correr-Sobrinho
L; Pini
NIP; Costa
AR; Sundfeld
RH; Pfeifer
CS; Martins
Abstract: This study investigated the influence of different hydrofluoric acid (HF) concentrations and heat treatments applied to a lithium disilicate dental glass-ceramic (EMX) on surface morphology and micro-shear bond strength (mu SBS) to resin cement. Five HF concentrations (1%, 2.5%, 5%, 7.5% and 10%) and four different heat treatments applied before etching were assessed: I. etching at room temperature with no previous heat treatment (control group); 2. HF stored at 70 degrees C for 1 min applied to the ceramic surface at room temperature; 3. HF at room temperature applied after a hot air stream is applied perpendicularly to the ceramic surface for 1 min; 4. the combination of previously heated HF and heated EMX surface. The etching time was fixed for 20 s for all groups. Etched EMX specimens were analyzed on field-emission scanning electron microscope (FE-SEM) and the mu SBS was carried out on a universal testing machine at a crosshead speed of 1 mm/min until fracture. For the control groups, FE-SEM images showed greater glassy matrix dissolution and higher mu SBS for 7.5% and 10% HF concentrations. The previous heat treatments enhanced the glassy matrix dissolution more evidently for 1%, 2.5% and 5% and yielded increased mu SBS values, which were not statistically different for 7.5% and 10% HF concentrations (control group). HF concentrations and previous heat treatments did show to have an influence on the etching/ bonding characteristics to lithium disilicate dental glass-ceramic. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
Subject: Electron Microscopy
Glass Ceramics
Biomedical Applications
Citation: Ceramics International. ELSEVIER SCI LTD, n. 42, n. 8, p. 10071 - 10078.
Rights: fechado
Identifier DOI: 10.1016/j.ceramint.2016.03.112
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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