Effect of Thermo-Mechanical Aging on The Marginal Fit of Two Types of Monolithic Zirconia Crowns With Two Finish Line Designs | ||||
| Al-Azhar Journal of Dentistry | ||||
| Volume 2018, Issue 1, January 2018 | ||||
| DOI: 10.21608/adjg.2018.7999 | ||||
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| Authors | ||||
| Khaled Haggag1; Muhammad Abbas2; Hussein Ramadan3 | ||||
| 1Assistant Professor, Crowns and Bridges Department, Faculty of Dental Medicine, Al Azhar University, Egypt | ||||
| 2Assistant Professor, Dental Biomaterials Department, Faculty of Dental medicine, Al-Azhar University, Egypt | ||||
| 3Lecturer,Crowns and Bridges Department,Faculty of Dental Medicine, Al Azhar University, Egypt | ||||
| Abstract | ||||
| OBJECTIVES: The purpose of this study was to compare the marginal fit of two CAD/CAM monolithic zirconia crowns with two finish line designs after thermo-mechanical aging. MATERIALS AND METHODS: A total of 20 zirconia crowns were divided into two groups Bruxzir and Prettau zirconia (n=10). Each type of zirconiacrowns was divided into two groups according to the finish line design chisel (CH) and deep chamfer (DC) groups (n=5) After cementation of crowns to their correspondingdies, the vertical marginal gap was measured then the all crowns of both groups were subjected to thermo-mechanical aging then the vertical marginal gap was measured again. RESULTS: Statistical analysis showed that. The thermo-mechanical aging significantly increased the vertical marginal gap where DC non-aged Bruxzir recording the lowest mean value (31.41±5.9) and the CH aged Bruxzir recorded the highest mean value (95.28±9.2) as indicated by three-way ANOVA test (F= 23.0741,p=<0.0001<0.05). CONCLUSIONS: Thermo-mechanical aging significantly increasedthe vertical Marginal gap and the deep chamfer finish line preparation is preferredfor construction of monolithic zirconia crowns. | ||||
| Keywords | ||||
| Thermo-Mechanical; Marginal fit; Zirconia Crowns | ||||
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