Influence of Repressed Lithium Silicate Ceramics on Translucency: Comparative Study

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The Egyptian Journal of Hospital Medicine

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	Influence of Repressed Lithium Silicate Ceramics on Translucency: Comparative Study
Article 130, Volume 92, Issue 1, July 2023, Page 6314-6317 PDF (408.12 K)
DOI: 10.21608/ejhm.2023.314481
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Abstract
Background: It is more cost-effective to press many restorations from a single ingot of lithium dislilicate glass-ceramics during the heat-pressing process. However, in many cases this is impossible and can lead to a substantial amount of waste (The sprues and button). Some dental labs reportedly recycle (repress) the remaining materials after heat pressing. Objective: The aim of the current study was to evaluate the effect of repressed lithium silicate ceramics on translucency (TP). Materials and methods: A total 60 discs were divided in 2 groups. The first group was pressed, and the second group was repressed ceramics. Each group included 30 discs (10 IPS e.max Press, 10 Celtra, 10 Ambria). The changes in translucency difference between the compared groups were evaluated. Results: Translucency parameter in IPS e.max Press translucency parameter in press (19.5±1.4) decreased in repress (17.3±1.4) with Δ TP (2.2±0.08), while Celtra translucency parameter in press (16.2±1.4) decreased in repress (14.2±1.4) with Δ TP (1.9±0.07), and Ambria translucency parameter in press (11.4±1.4) decreased in repress (10.11±1.4) with Δ TP (1.3±0.09). Contrast ratio of both press and repress were equal (0.7± 0.13).Conclusions: The translucency of repressed ceramics decreased after repress.We advise pressing glass ceramics for a single injection.


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