ABSTRACT

Purpose

To evaluate the fracture force of CAD-CAM-fabricated overlay restorations (Feld spathic cerec


blocks) and hybrid ceramic material (VITA Enamic) using deep marginal elevation technique


(DME).


Materials and methods


Twenty overlay restorations were constructed in this study. The samples were divided into two


main groups according to the ceramic material (n=10). The type of ceramics that was used is


(feld spathic for group I and vita enamic for group II). a ceramic material which was used (10


samples each):- The first group : feld spathic cerec blocks cemented by RelyX Ultimate Clicker


resin cement. The second group: VITA ENAMIC hybrid ceramic overlays cemented by RelyX


Ultimate Clicker resin cement. Each main group was subdivided into two subgroups for each


type of the ceramic material according to the fracture force (n=5), One of them without deep


marginal elevation and the other with a deep marginal elevation (DME) till the cemento-enamel


junction (CEJ).


Results


Between the two materials There was a significant difference between the feld spathic and vita


enamic materials in with and without deep marginal elevation technique .


Conclusion


VITA Enamic material has higher fracture force than feld spathic material in samples with deep


marginal elevation. Feld spathic material has higher fracture force than vita enamic material in


samples without (DME).