Aim: measure vertical marginal gap using CEREC TESSERA advanced lithium disilicate.
Materials and Methods: In this study, twenty-four natural central incisors were used to create Endocrowns, divided into two groups based on their preparation design. Group 1 involved a 1mm deep Chamfer finish line and a 2mm ferrule, extending 2mm inside the pulp from the cavosurface margin. Group 2 featured a similar Chamfer finish line depth but with a 2mm ferrule extending 4mm inside the pulp from the cavosurface margin. Each group was then subdivided into two subgroups for specific tests. Subgroup 1 aimed to measure vertical marginal gap using CEREC TESSERA advanced lithium disilicate. Subgroup 2 focused on conducting a fracture resistance test using the same material. Measurements of the vertical marginal gap were taken both before and after cementation, and all samples were subjected to thermocycling during the experimental process.
Results: There was an insignificant difference before and after cementation) in total vertical marginal gap between the two studied groups design (1) 2mm extension and design (2) 4 mm extension.There was insignificant difference in verticle Margin gap after cementation in the two studied groups design 1 (2mm extension) and design 2 (4mm extension).
Conclusion: Tessera anterior endocrowns with both 2mm and 4mm pulp chamber extensions achieve similar vertical marginal gaps before and after cementation, indicating reliable marginal integrity for both designs. The 4mm pulp chamber extension the preferable option for improving the longevity and durability of the restoration in clinical practice enhances fracture resistance.