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Effect of surface treatments on ceramic processed in different ways


Nowadays, dental ceramics have been proposed and used without metal reinforcement. This development is mainly due to favorable properties and improved, but still have some inadequacies inherent in the material. Within these innovations, the ceramics are reinforced by oxides of lithium disilicate, which are available on the market in two distinct ways to obtain indirect restorations: IPS e.max PRESS , used with the injection system and IPS e.max CAD, that used the CAD / CAM system. The proposal in this study is to investigate the behavior of this material, processed in two different systems, when subjected to the procedure for surface treatment and cleaning, and after application of a protocol cementation experienced in previous studies. 60 bars will be made (20x4x1,2mm) for each group (IPS e.max PRESS - Group 1; IPS e.max CAD - Group 2). The subgroups will consist of 10 bars each, and will be submitted to the following surface treatments: A, no treatment; B, application of 10% hydrofluoric acid (HF) for 20s + wash (60s), dry (30s); C , HF (20s) + wash (60s), dry (30s) and cementation; D, HF (20s) + wash (60s) + neutralization with supersaturated solution of sodium bicarbonate (SB) for 40s + wash (5s) + dry (30s) and cementation; E, HF (20s) + wash (60s) + ultrasonic cleaning in deionized water (US) for 4 min + dry (30s) and cementation; and F, HF (20s) + wash (60s ) + neutralization with SB (40s) + cleaning in US (4 min) and cementation. The specimens will be tested using the flexural strength of three points and further evaluation of scanning electron microscopy of the fractured surfaces. (AU)

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