Effect of Repeated Heat Pressing on Microstructure, Hardness and Surface Topography of Two Pressable Ceramics

Authors

1 Assistant Lecturer of Crowns and Bridges, Faculty of Dental Medicine for Girls, Al-Azhar University, Cairo, Egypt

2 Professor of Crowns and Bridges, Faculty of Dental Medicine for Girls, Al-Azhar University, Cairo, Egypt

Abstract

Purpose To evaluate the effect of repeated heat pressing of Lithium disilicate (IPS e.max press) and zirconia reinforced lithium disilicate (Celtra press) on their microstructure, hardness and surface topography. Materials and methods Two commercially available pressable glass ceramics; IPS e.max press (Ivoclar, vivadent) and Celtra press (Dentsply, Sirona) were used in this study. The two materials were used to fabricate a total of forty discs with 2 mm thickness and 10 mm diameter representing two groups (n=20) group I: IPS e.max press and group II: Celtra press discs. Each group was subdivided into two equal subgroups according to number of pressing cycles; subgroup (A): Pressed ceramic discs and subgroup (B): Repressed ceramic discs, (n=10) each. Then the samples were subjected to thermomechanical fatigue using chewing simulator, resembling 3 and 6 months. Microstructure, hardness and surface topography were evaluated at baseline, after thermomechanical fatigue representing 3 and 6 months. Data were collected and statistically analyzed using One-way ANOVA and Pearson’s correlation tests. The significance level was set at P

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