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CC BY 4.0 · Eur J Dent 2023; 17(04): 1114-1119
DOI: 10.1055/s-0042-1758787
Original Article

Marginal Discrepancy of Five Contemporary Dental Ceramics for Anterior Restorations

Noor Nawafleh 
1   Department of Applied Dental Sciences, Faculty of Applied Medical Sciences, Jordan University of Science and Technology, Irbid, Jordan
,
Muhanad Hatamleh
2   Department of Applied Medical Sciences, Luminus Technical University College, Amman, Jordan
,
Yasmeen Janzeer
1   Department of Applied Dental Sciences, Faculty of Applied Medical Sciences, Jordan University of Science and Technology, Irbid, Jordan
,
Ali Alrahlah
3   Engineer Abdullah Bugshan Research Chair for Dental and Oral Rehabilitation, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
4   Restorative Dental Sciences Department, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
,
Khold Alahadal
4   Restorative Dental Sciences Department, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
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Abstract

Objectives This study aimed to compare marginal accuracy of five contemporary all-ceramic crowns indicated for anterior restorations.

Materials and Methods A master die of maxillary central incisor was prepared for all-ceramic crown and duplicated to produce 50 replicas of epoxy resin material. Five ceramic materials were used to mill the crowns (n = 10). All crowns were manufactured following the same digital workflow; same master die, scanning unit and design software, and the recommended manufacturing protocol. Final seating of crown was secured by a small droplet of temporary cement on its incisal edge. Marginal accuracy was evaluated by scanning electronic microscope with a magnification of 300 × . Vertical marginal gap was measured for each crown at predefined four points.

Statistical Analysis One-way analysis of variance was used to test differences between groups and Tukey test was used for multiple comparisons between group combinations. A level of significance at 95% was set for all statistics.

Results The highest mean marginal gap and mean maximum gap calculated were for the e.max CAD crowns (49.2 µm, 87.6 µm), while the lowest values were for the Cercon xt crowns (10.2 µm, 21.7 µm). The mean marginal gap and the mean maximum gap of the e.max CAD crowns were statistically significantly greater than those of all other groups (p < 0.05). However, the differences between all other combinations were insignificant (p > 0.05).

Conclusion Marginal accuracy of lithium disilicate crowns is clinically acceptable. Zirconia and zirconia-reinforced lithium silicate materials can produce a greater level of marginal accuracy compared to lithium disilicate.

Keywords

marginal fit - marginal accuracy - CAD/CAM - zirconia - lithium silicate


Publication History

Article published online:
04 January 2023

© 2023. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

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