Comparative Evaluation of Fracture Resistance and Hardness of Two Esthetic Crowns for Young Permanent Teeth after Thermocycling

Document Type : Original Article

Authors

1 Dentist at Egyptian ministry of health, B.D.S (2016) Future University in Egypt, Faculty of Dental Medicine for Girls Al-Azhar University, Cairo-Egypt

2 Associate Professor and Head of Pedodontics and Oral Health Department, Faculty of Dental Medicine for Girls Al-Azhar University, Cairo-Egypt

3 Lecturer of Pedodontics and Oral Health, Faculty of Dental Medicine for Girls Al-Azhar University, Cairo-Egypt

Abstract

Purpose Evaluate and compare fracture resistance and micro-hardness of Nu-smile youth zirconia crowns and CAD/CAM zirconia crowns after thermocycling. Settings and Design In vitro comparative study. Methods and Material Twenty-four zirconia crowns for young first permanent molars were used. They were 12 ready-made Nu-Smile youth zirconia crowns and 12 custom-made Katana zirconia crowns. All crowns were mounted and cemented on a negative replica. All crowns were immersed in a mechatronic thermo-cycler. Fracture resistance tests was done by using universal testing machine. While micro-hardness was determined by using a Digital Display Vickers Tester. Maximum breaking loads were recorded. Statistical analysis Statistical analysis was performed using Graph-Pad Instat statistics software (version 3.06) for Windows. the differences between the groups revealed by student t-test (P= 0.003

Keywords

Al-Azhar Journal of Dentistry
Volume 12, Issue 1
January 2025
Pages 77-83

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