Journal of Conservative Dentistry
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ORIGINAL ARTICLE
Year : 2019  |  Volume : 22  |  Issue : 1  |  Page : 59-63

Effect of different core design made of computer-aided design/computer-aided manufacturing system and veneering technique on the fracture resistance of zirconia crowns: A laboratory study


1 Department of Fixed Prosthodontics, Faculty of Dentistry, Damascus University, Damascus, Syria
2 Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, Dar Al Uloom University, Riyadh, Saudi Arabia; Department of Prosthodontics, School of Dentistry, Ibb University, Ibb, Yemen
3 Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, Dar Al Uloom University, Riyadh, Saudi Arabia
4 Department of Preventive Dental Sciences, College of Dentistry, Prince Sattam Bin Abdulaziz University, Al-Kharj; Department of Preventive Dental Sciences, Dar Al-Uloom University, Riyadh, Saudi Arabia
5 Department of Fixed Prosthodontics, Faculty of Dentistry, Damascus University, Damascus, Syria, Yemen

Correspondence Address:
Dr. Abdulaziz Samran
Department of Restorative and Prosthetic Dental Sciences, Faculty of Dentistry, Dar Al Uloom University, Al Mizan Street, Riyadh 13314

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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/JCD.JCD_426_18

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Background: It is unclear how the different core designs made of computer-aided design/computer-aided manufacturing (CAD/CAM) system and veneering techniques affect the fracture resistance of endodontically treated teeth. Aim: The aim of this in vitro study is to investigate the effect of different core designs made of CAD/CAM system and veneering techniques on the fracture resistance of zirconia ceramic crowns. Materials and Methods: Two types of zirconia copings were designed; the first one with circumferential 0.5-mm chamfer and the second one with circumferential 1-mm deep chamfer. The core specimens (in subgroups) were veneered anatomically with either a layering technique (hand-layer) or with press-on technique resulting in four test groups (n = 12). All crowns were then cemented using self-adhesive resin cement. After that, all specimens were loaded in a universal testing machine until fractured. Statistical Analysis: Data were then analyzed with two-way analysis of variance (ANOVA) (α =0.05). Results: Mean (standard deviation) failure loads for groups ranged from 2412.7 N (±624.6) to 3020.1 N (±1099.8). Two-way ANOVA revealed no statistically significant differences among groups (P > 0.05). Almost all groups showed cohesive failure in the veneering ceramic. Conclusions: Within the limitations of this laboratory study, neither the core design nor the veneering technique affected the fracture resistance of all-ceramic crowns significantly.


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