EFFECT OF REPRESSING AND GLAZING ON COLOR REPRODUCTION, TRANSLUCENCY AND SURFACE ROUGHNESS OF LITHIUM DISILICATE GLASS-CERAMICS
El-Etreby, Amr S.
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Statement of problem: During heat-pressing of lithium dislilicate glass-ceramics, It is more economical to press several restorations from one ingot at the same time. However, this is often not possible and may result in a considerable amount of leftover material (The sprues and button). It has been reported that the leftover materials after heat-pressing are reused (repressed) in some dental laboratories. Sufficient knowledge about the consequences of such procedure is not available. The issue is thereby raised whether the leftover material should be discarded or reused. Purpose. The aim of the present study was to evaluate the effect of repressing and glazing on the color reproduction, translucency and surface roughness of lithium dislilicate pressable glass- ceramics (IPS e.max Press). As well as to describe the microstructural features present in pressed, and repressed material using Xray diffraction, EDAX and SEM
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