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ORIGINAL ARTICLE
Year : 2020  |  Volume : 17  |  Issue : 2  |  Page : 45-52

Influence of fabrication techniques on vertical marginal gap distance and internal adaptation of zirconia-reinforced lithium silicate all-ceramic crowns


1 Oral and Maxillofacial Prosthodontic Department, Faculty of Dentistry, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia
2 Department of Fixed Prosthodontics, Faculty of Dentistry, October 6 University, Cairo, Egypt

Correspondence Address:
Shereen K Salem
Department of Fixed Prosthodontics, Faculty of Dentistry, October 6 University, Cairo
Egypt
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/tdj.tdj_18_19

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Objective This in-vitro study aimed to evaluate vertical marginal gap distance and internal adaptation of CAD/CAM and heat pressed (HP) zirconia-reinforced lithium silicate (ZLS) all-ceramic crowns. Materials and methods A typodont maxillary first premolar was selected in this study and prepared to receive all-ceramic crown. Fifteen ZLS ceramic crowns were constructed and divided into three groups according to their fabrication technique. Group 1: Five CAD/CAM Celtra Duo crowns. Group 2: Five HP Celtra Press crowns using CAD/CAM wax patterns. Group 3: Five HP Celtra Press crowns using conventional wax patterns. After fabrication of the all-ceramic crowns by different techniques, the vertical marginal gap distance between the crown margin and the finish line of the prepared tooth was measured using a digital microscope of ×40 at 16 points/crown. Internal adaptation was evaluated using silicone replica technique. Data were collected, tabulated and statistically analyzed (Tukey post-hoc test) at P value up to 0.05. Results The results showed that there was a statistically significant difference between the three groups regarding the vertical marginal gap distance and internal adaptation with the lowest mean value of vertical marginal gap in Celtra Press using CAD/CAM wax patterns crowns and the best internal adaptation was found in CAD/CAM Celtra Duo. Conclusion All fabrication techniques used in this study yield marginal and internal adaptation that is within the clinically acceptable range.


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