Abdelaal, A., Kehela, H., Holiel, A. (2025). Fracture resistance of overlays of upper premolars restored by two types of pressable ceramics.. Alexandria Dental Journal, 50(1), 206-211. doi: 10.21608/adjalexu.2024.276595.1484
Abdelaziz M. Abdelaal; Hany Kehela; Ahmed A. Holiel. "Fracture resistance of overlays of upper premolars restored by two types of pressable ceramics.". Alexandria Dental Journal, 50, 1, 2025, 206-211. doi: 10.21608/adjalexu.2024.276595.1484
Abdelaal, A., Kehela, H., Holiel, A. (2025). 'Fracture resistance of overlays of upper premolars restored by two types of pressable ceramics.', Alexandria Dental Journal, 50(1), pp. 206-211. doi: 10.21608/adjalexu.2024.276595.1484
Abdelaal, A., Kehela, H., Holiel, A. Fracture resistance of overlays of upper premolars restored by two types of pressable ceramics.. Alexandria Dental Journal, 2025; 50(1): 206-211. doi: 10.21608/adjalexu.2024.276595.1484
Fracture resistance of overlays of upper premolars restored by two types of pressable ceramics.
1Department of Conservative Dentistry, faculty of Dentistry, Alexandria University, Alexandria, Egypt
2Department of Consevative Dentistry. Faculty of Dentistry, Alexandria University, Egypt
3Conservative Dentistry Department, Faculty of Dentistry, Alexandria University, Egypt
Abstract
INTRODUCTION: There is a lack of scientific evidence about the fracture resistance properties of the newly introduced pressable type zirconia-reinforced lithium silicate when partial coverage is indicated for upper premolars. OBJECTIVE: The aim of the study is to evaluate the fracture resistance and fractographic analysis of lithium disilicate and zirconia-reinforced lithium silicate used in overlays. MATERIALS AND METHODS: Twenty-six duplicated epoxy resin dies were prepared following overlay preparation guidelines. The specimens were divided into two groups to be restored with lithium disilicate (IPS e.max Press) or zirconia-reinforced lithium silicate (Vita Ambria) (n=13 each). Cemented overlays were subjected to thermomechanical fatigue, and the load to fracture was tested by using a universal testing machine. The normality of the fracture resistance was checked using the Shapiro‒Wilk test and Q‒Q plots. RESULTS: when comparing overlays restored with lithium disilicate and those restored with zirconia-reinforced lithium silicate, the comparison was statistically significant. Group of overlays restored with zirconia-reinforced lithium silicate showed higher mean fracture load of 1218.69. CONCLUSIONS: The newly introduced zirconia-reinforced lithium silicate had higher fracture resistance than did the lithium disilcate and could be an alternative for partial coverage restoration. KEYWORDS: Fracture resistance, Lithium disilicate, Zirconia-reinforced lithium silicate, partial coverage restorations. RUNNING TITLE: Fracture resistance of two ceramic materials in overlays.
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