الفهرس | Only 14 pages are availabe for public view |
Abstract Summary This study evaluated the fracture strength and marginal gap of two different types of hybrid ceramic crowns in comparison to lithium disilicate ceramics. A maxillary premolar was prepared to receive all ceramic crowns . The prepared tooth was duplicated in to fifteen epoxy resin working dies using silicon duplicating moulds. Each die was scanned using the Omnicam scanner, then milling of five Vita Suprinity ,five E. max and five Vita Enamic crowns using the cerec in lab 3D system. Finshing and polishing of Vita Enamic crowns. Finishing and crystallization of Vita suprinity and E. max crowns. Measuring of vertical marginal gap before cementation using a etallurgic microscope at eight points of each crown. The fabricated crowns were adhesively cemented with panavia F.2 adhesive resin cement on the corresponding epoxy dies. The fracture strength test was done using a universal testing machine. Results: showed that Vita suprinity crowns (80.14 ± 7.64) had a statistically significant higher marginal gap than that of E.max (60.13 ±3.63) and Vita Enamic (55.56 ± 7.20).The E.max crowns (1761.6 ±101.0) and Vita suprinity (1633.5 ± 149.5 ) had a significantly higher fracture strength value than Vita enamic ( 1002.8 ± 78.9) |