Comparative Evaluation of Fracture Resistance and Hardness of Two Esthetic Crowns for Young Permanent Teeth after Thermocycling | ||
| Al-Azhar Journal of Dentistry | ||
| Volume 12, Issue 1, January 2025, Pages 77-83 PDF (1.07 M) | ||
| Document Type: Original Article | ||
| DOI: 10.58675/2974-4164.1655 | ||
| Authors | ||
| Yasmeen S. Abo-Al Kheir1; Mohammed H. Mostafa2; Yomna O. Morad3 | ||
| 1Dentist at Egyptian ministry of health, B.D.S (2016) Future University in Egypt, Faculty of Dental Medicine for Girls Al-Azhar University, Cairo-Egypt | ||
| 2Associate Professor and Head of Pedodontics and Oral Health Department, Faculty of Dental Medicine for Girls Al-Azhar University, Cairo-Egypt | ||
| 3Lecturer 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 | ||
| Zirconia Crowns; CAD/CAM; Nu-smile; Katana; Fracture resistance; Microhardness | ||
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