Effect of Multiple Firing Cycles on the Physical Properties of Three Pressable Lithium Silicate Glass Ceramics
Radwan, A., Nouh, I., Thabet, A. (2020). Effect of Multiple Firing Cycles on the Physical Properties of Three Pressable Lithium Silicate Glass Ceramics. EKB Journal Management System, 66(Issue 4 - October (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)), 2633-2639. doi: 10.21608/edj.2020.42266.1253
Ahmed Radwan; Ingy Mohamed Nouh; Ahmed Thabet. "Effect of Multiple Firing Cycles on the Physical Properties of Three Pressable Lithium Silicate Glass Ceramics". EKB Journal Management System, 66, Issue 4 - October (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials), 2020, 2633-2639. doi: 10.21608/edj.2020.42266.1253
Radwan, A., Nouh, I., Thabet, A. (2020). 'Effect of Multiple Firing Cycles on the Physical Properties of Three Pressable Lithium Silicate Glass Ceramics', EKB Journal Management System, 66(Issue 4 - October (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)), pp. 2633-2639. doi: 10.21608/edj.2020.42266.1253
Radwan, A., Nouh, I., Thabet, A. Effect of Multiple Firing Cycles on the Physical Properties of Three Pressable Lithium Silicate Glass Ceramics. EKB Journal Management System, 2020; 66(Issue 4 - October (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)): 2633-2639. doi: 10.21608/edj.2020.42266.1253

Effect of Multiple Firing Cycles on the Physical Properties of Three Pressable Lithium Silicate Glass Ceramics

Egyptian Dental Journal
Article 20, Volume 66, Issue 4 - October (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials), October 2020, Page 2633-2639  XML PDF (398.52 K)
Document Type: Original Article
DOI: 10.21608/edj.2020.42266.1253
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Authors
Ahmed Radwan email 1; Ingy Mohamed Nouhorcid 2; Ahmed Thabetorcid 3
1Fixed Prosthodontics, Faculty of dentistry, Ain Shams University,Cairo, Egypt
2fixed Prosthodontics, Faculty of dentistry,Ain Shams University, Cairo, Egypt
3Fixed Prosthodontics, Faculty of dentistry, Ain Shams University, Cairo, Egypt
Abstract
Statement of the problem
To achieve esthetic perfection with dental ceramics, ceramic dental restorations may need to undergo multiple firing cycles for characterization. The behavior of lithium silicate ceramics when exposed to those firing cycles is not well understood, the way it might affect the optical and mechanical properties of restorations.
Purpose
The aim of this in-vitro study was to investigate the effect of multiple firing cycles on translucency and biaxial flexure strength Of 3 different types of pressable lithium silicate ceramics.
Materials and methods
A total of 72 disc shape specimens (10mm diameter and 1mm thickness) were fabricated by heat pressing of LT A1 shaded ingots. 24 specimens of Celtra press and the same number of IPS e.max press and Livento press lithium silicates materials.
Each material group were subdivided in to three subgroups (8 samples per group) according to the number of firing cycles. One, three, and five firing cycles’ protocols were constructed, to simulate the firing protocols of the three common laboratory fabrication techniques (staining, cutback, and layering) of glass ceramic restorations. Translucency parameters and biaxial flexural strength were evaluated for specimens to detect the effect of multiple firing cycles.
Results
All tested materials showed statistically significant decrease in translucency parameters values with multiple firing cycles. No significant effect was detected on the biaxial flexural strength values after repeated firing.
Conclusion
Translucency of tested materials is negatively affected by multiple firing cycles. Multiple firings have no effect on the biaxial flexural strength of lithium silicate ceramics.
Keywords
Pressable ceramics; Biaxial flexural strength; Translucency; Multiple firing cycles; lithium silicate
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