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Abstract Endocrown proved its reliability and durability and efficacy in restoring the endodontically treated teeth due to its better stress distribution and it is less invasion approach, more conservative as it is a caries oriented preparation and don’t require radicular preparation in addition to that it is time and effort saver. On the other side, the inlay/onlay retained bridge proved its reliability and efficacy in restoring the missing teeth with a conservative tooth preparation. Success of the two aforementioned designs of restorations with the care to be conservative, pushed us to make a hybrid design from the inlay/onlay retained bridge and endocrown which is the endocrown retained bridge and to investigate about its reliability through scanning fresh extracted sound maxillary second molar and second maxillary premolar with a high resolution cone beam CT in the endodontic mode to reproduce a natural and reliable anatomy of design in order to simulate the natural teeth form and we used Mimics 15.01 (Materialise NV) and 3-matic 7.01 (Materialise NV) softwares in the designing process of our design. We used ANSYS Workbench 14 (ANSYS Inc., Canonsburg, PA, USA) software to apply the masticatory forces on our design and we calculate stresses upon our design then we tabulated results to complete our study. We found that endocrown retained bridge was a successful design of fixed partial dentures according to our study and it can be manufactured from lithium disilicate, zirconia reinforced lithium silicate and zirconia but preferably to be manufactured from zirconia reinforced lithium silicate and lithium disilicate because they presented the most favorable stresses on teeth and less liability to teeth fracture. Additionally, zirconia reinforced lithium silicate is a promising new type of ceramic that proved according to our study that it can be used in three units posterior bridge construction due to its good mechanical properties as it is used till now in construction of a single tooth restoration only. |