Fracture resistance of overlays of upper premolars restored by two types of pressable ceramics. | ||
| Alexandria Dental Journal | ||
| Article 48, Volume 50, Issue 1, April 2025, Pages 206-211 PDF (338.41 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/adjalexu.2024.276595.1484 | ||
| Authors | ||
| Abdelaziz M. Abdelaal* 1; Hany Kehela2; Ahmed A. Holiel3 | ||
| 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. | ||
| Keywords | ||
| Fracture resistance; Lithium disilicate; Zirconia-reinforced lithium silicate; partial coverage restorations | ||
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