Fracture resistance of overlays of upper premolars restored by two types of pressable ceramics.

Document Type : Original Article

Authors

1 Department of Conservative Dentistry, faculty of Dentistry, Alexandria University, Alexandria, Egypt

2 Department of Consevative Dentistry. Faculty of Dentistry, Alexandria University, Egypt

3 Conservative 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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Alexandria Dental Journal
Volume 50, Issue 1
B (Endodontics, Prosthodontics, Fixed prosthodontics, Conservative dentistry, Dental Biomaterials)
April 2025
Pages 206-211

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