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Type: Artigo
Title: The Effect Of Hydrofluoric Acid Concentration And Heat On The Bonding To Lithium Disilicate Glass Ceramic
Author: Sundfeld
Daniel; Correr-Sobrinho
Lourenço; Pini
Núbia Inocêncya Pavesi; Costa
Ana Rosa; Sundfeld
Renato Herman; Pfeifer
Carmem Silvia; Martins
Luis Roberto Marcondes
Abstract: The aim of this study was to evaluate the effects of hydrofluoric acid (HF) concentration and previous heat treatment (PHT) on the surface morphology and micro-shear bond strength (mSBS) of a lithium disilicate glass ceramic (EMX) to resin cement. One hundred four EMX specimens were randomly assigned to two groups (n=52) according to the HF concentration: 5% and 10%. A new random distribution was made according to the PHTs (n=13): control (no PHT); previously heated HF (70 °C); previously heated EMX surface (85 °C); the combination of heated HF + heated EMX surface. The etching time was set at 20 s. All EMX blocks were silanated and received a thin layer of an unfilled resin. Five resin cement cylinders were made on each EMX surface using Tygon tubes as matrices, and then stored for 24 h at 37 °C. One random etched EMX sample from each group was analyzed using field-emission scanning electron microscopy (FE-SEM). The data were subjected to two-way ANOVA and multiple comparisons were performed using the Tukey post hoc test (a=0.05). For the control groups, 5% HF showed statistically lower mSBS values when compared to 10% HF (p<0.05). PHT increased the mSBS values for 5% HF, yielding statistically similar results to non-PHT 10% HF (p<0.05). FE-SEM images showed increased glassy matrix removal when PHT was applied to HF 5%, but not to the same degree as for 10% HF. PHT has the potential to improve the bond strength of 5% HF concentration on lithium disilicate glass ceramic.
Subject: Lithium Disilicate Glass Ceramic
Hydrofluoric Acid
Heat Treatment
Microshear Bond Strength
Fe-sem Analysis
Editor: Fundação Odontológica de Ribeirão Preto
Citation: Brazilian Dental Journal. Fundação Odontológica De Ribeirão Preto, v. 27, n. 6, p. 727 - 733
Rights: aberto
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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