Marginal Adaptation and Failure Load of Hybrid Ceramic Crowns with Shoulder and Feather-Edge Margin Designs After Thermomechanical Fatigue
El-Hefnawy, W., Mandour, M., Montaser, A., Elhefnawy, M. (2024). Marginal Adaptation and Failure Load of Hybrid Ceramic Crowns with Shoulder and Feather-Edge Margin Designs After Thermomechanical Fatigue. EKB Journal Management System, 11(4), 32-39. doi: 10.58675/2974-4164.1647
Walaa T. El-Hefnawy; Mona H. Mandour; Ayat G. Montaser; Mohamed Elhefnawy. "Marginal Adaptation and Failure Load of Hybrid Ceramic Crowns with Shoulder and Feather-Edge Margin Designs After Thermomechanical Fatigue". EKB Journal Management System, 11, 4, 2024, 32-39. doi: 10.58675/2974-4164.1647
El-Hefnawy, W., Mandour, M., Montaser, A., Elhefnawy, M. (2024). 'Marginal Adaptation and Failure Load of Hybrid Ceramic Crowns with Shoulder and Feather-Edge Margin Designs After Thermomechanical Fatigue', EKB Journal Management System, 11(4), pp. 32-39. doi: 10.58675/2974-4164.1647
El-Hefnawy, W., Mandour, M., Montaser, A., Elhefnawy, M. Marginal Adaptation and Failure Load of Hybrid Ceramic Crowns with Shoulder and Feather-Edge Margin Designs After Thermomechanical Fatigue. EKB Journal Management System, 2024; 11(4): 32-39. doi: 10.58675/2974-4164.1647

Marginal Adaptation and Failure Load of Hybrid Ceramic Crowns with Shoulder and Feather-Edge Margin Designs After Thermomechanical Fatigue

Al-Azhar Journal of Dentistry
Volume 11, Issue 4, October 2024, Pages 32-39    PDF (617.71 K)
Document Type: Original Article
DOI: 10.58675/2974-4164.1647
Authors
Walaa T. El-Hefnawy1; Mona H. Mandour2; Ayat G. Montaser3; Mohamed Elhefnawy4
1Assistant Lecturer of Fixed Prosthodontics, Faculty of Dentistry, Sinai University, Egypt
2Professor of Crowns and Bridges, Faculty of Dental Medicine for Girls, AlAzhar University, Cairo, Egypt
3Lecturer of Crowns and Bridges, Faculty of Dental Medicine for Girls, AlAzhar University, Cairo, Egypt
4Postdoctoral Research Fellow at the Department of Forest Resources Management, Faculty of Forestry, University of British Columbia, Canada
Abstract
Purpose : To estimate the marginal adaptation and failure load of hybrid ceramic “Vita Enamic” crowns with two margin designs; shoulder and feather-edge after thermomechanical fatigue. Materials and Methods: A typodont mandibular first molar was selected. Exocad software was used to perform standard preparations of Vita Enamic ceramic crowns with two different margin designs; the first was prepared with a shoulder margin configuration, group (S) and the second was prepared with a featheredge margin configuration, group (FE). Each prepared design was duplicated 15 times to form a total of 30 epoxy resin replicas ["n=15" for shoulder (S) group and "n=15" for the feather-edge (FE) group]. A total of 30 Vita Enamic crowns (N=30) were designed and constructed using CAD/CAM machine. All crowns were adhesively bonded to their corresponding epoxy resin dies by using self-adhesive resin cement and then subjected to thermomechanical fatigue. Finally, perpendicular marginal space and failure load were gauged. Results: Shoulder margin "group S" registered lower average perpendicular marginal space (68.075±5.60μm) as well as a higher average failure load value (1676±80.34N) compared to feather-edge margin "group FE'' (84.138±2.78μm) (1355.39±274.85N) respectively. Conclusion: For Vita Enamic ceramic crowns; both marginal adaptation and failure load of different margin designs conform to the range that is clinically approved.
Keywords
Shoulder margin; Feather-edge margin; Vita Enamic; marginal adaptation; Failure Load
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