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Comparative Evaluation of Marginal Vertical Discrepancies of Full Zirconia Crowns, Layered Zirconia Crowns, and Metal Ceramic Crowns: An In Vitro Study
Devabhaktuni Disha Saraswathi1, Gudugunta Leneena2, Mandava Ramesh Babu3, Vipin Sudheer4, Sri Chandana Puvvada5, Pallavi Vyapaka6
1 Professor, Department of Conservative Dentistry and Endodontics, Drs. Sudha & Nageswara Rao Siddhartha Institute of Dental Sciences, Chinoutpalli, Andhra Pradesh, India
2 Senior Lecturer, Department of Conservative dentistry and Endodontics, GSL Dental College, Rajahmundry, Andhra Pradesh, India
3 Professor & Head, Department of Conservative Dentistry and Endodontics, Drs. Sudha & Nageswara Rao Siddhartha Institute of Dental Sciences, Chinoutpalli, Andhra Pradesh, India
4 Consultant Endodontist, Armed Medical Force services, Qatar
5 Senior Lecturer, Department of Conservative Dentistry and Endodontics, Sri Venkateswara Dental College, Bengaluru, Karnataka, India
6 Reader, Department of Conservative Dentistry and Endodontics KSR Institute of Dental Sciences, Tiruchengode, Tamil Nadu, India
Correspondence Address:
Devabhaktuni Disha Saraswathi
Professor, Department of Conservative Dentistry and Endodontics, Drs. Sudha & Nageswara Rao Siddhartha Institute of Dental Sciences, Chinoutpalli, Andhra Pradesh, India
 Source of Support: None, Conflict of Interest: None  | Check |
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Background: Strength, color stability, and precision of fit are requirements for all-ceramic restorations. Full zirconia has evolved to overcome the disadvantages of layered zirconia. However, marginal fit has not been evaluated so far. This original research compared the marginal vertical discrepancies of full zirconia, layered zirconia, and metal ceramic crowns and evaluated the effect of veneering on the marginal fit of zirconia copings as well as metal copings.
Materials and Methods: A total of 30 samples were used in this study. Three zirconia dies of the same dimensions were designed by computer aided designing/computer aided manufacturing (CAD/CAM) and were used to fabricate crowns in the following experimental groups: Group 1 (full zirconia); Group 2a (zirconia copings), Group 2b (layered zirconia crowns); Group 3a (metal ceramic copings) and Group 3b (metal ceramic crowns). Full crown restorations were prepared using CAD/CAM. The marginal gap was measured under a stereomicroscope. The measurement was done twice for Group 2 and Group 3 before and after veneering. The results were statistically analyzed using ANOVA test and t-test.
Results: All the three test groups showed statistically similar marginal gap, but there was a significant difference in the marginal gap between Group 3a and Group 3b.
Conclusion: The mean marginal gap of all the test groups was within the clinically acceptable level. There was no effect of veneering on the marginal fit of zirconia copings, but there was a significance of veneering on the marginal fit of metal ceramic restorations. |
