Influence of ceramic thickness and CAD/CAM ceramic materials on the fracture resistance of indirect restorations: An in vitro study

Authors

• Lara El Hanach, Saint Joseph University of BeirutFollow
• Karim Corbani, université saint joseph de BeyrouthFollow
• Nabil Ghosn, Saint Joseph University of BeirutFollow
• Ryan Harouny, Faculty of Dentistry - Saint Joseph UniversityFollow
• Cynthia KassisFollow

Abstract

This in-vitro study aimed to evaluate the impact of different CAD/CAM materials (IPS e.max® CAD and Cerasmart®) and thicknesses (0.7 mm, 1 mm, and 1.5 mm) on the fracture resistance of indirect overlay restorations. Sixty-three human third molars were divided into 7 groups (n=9) based on material and thickness, including a control group of 9 sound teeth. Only 54 specimens were prepared using a thin-section cutting machine, scanned, and their scans were used to fabricate overlays from different materials and thicknesses. After adhesive cementation, the overlays underwent thermal cyclic loading (5,000 cycles between 5°C and 55°C). A universal testing machine assessed fracture resistance, revealing that 1 mm (2737 N) and 1.5 mm (2879 N) thicknesses exhibited significantly higher resistance than 0.7 mm (1974 N) (p0.05).

Recommended Citation

El Hanach, Lara; Corbani, Karim; Ghosn, Nabil; Harouny, Ryan; and Kassis, Cynthia (2026) "Influence of ceramic thickness and CAD/CAM ceramic materials on the fracture resistance of indirect restorations: An in vitro study," International Arab Journal of Dentistry: Vol. 17: Iss. 2, Article 7.
DOI: https://doi.org/10.65314/2218-0885.1867
Available at: https://e-journals.usj.edu.lb/iajd/vol17/iss2/7