Heat treatment-improved bond strength of resin cement to lithium disilicate dental glass-ceramic

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• 作者：Daniel Sundfeld^a ; ^b ; ^{sundfeldneto@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Lourenç ; o Correr-Sobrinho^c ; Nú ; bia Inocê ; ncya Pavesi Pini^a ; Ana Rosa Costa^c ; Renato Herman Sundfeld^d ; Carmem Silvia Pfeifer^b ; Luis Roberto Marcondes Martins^a
• 关键词：B. Electron microscopy ; B. Surfaces ; C. Strength ; D. Glass ceramics ; E. Biomedical applications
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：42
• 期：8
• 页码：10071-10078
• 全文大小：4249 K

文摘

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 (μSBS) to resin cement. Five HF concentrations (1%, 2.5%, 5%, 7.5% and 10%) and four different heat treatments applied before etching were assessed: 1. etching at room temperature with no previous heat treatment (control group); 2. HF stored at 70 °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 μSBS 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 μSBS 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 μSBS 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.