ABSTRACRT

Objective:
This study evaluated the effect of cervical marginal elevation with composite resin and biodentine on vertical marginal gap of CAD/CAM endocrown restorations.
Material and Methods:
Thirty two molar were used in this study divided into two main groups, Group I : 16 molar teeth were elevated distally with resin composite each and Group II: 16 molar teeth were elevated distally with biodentine. Subsequently endocrown restorations restored the prepared teeth. Each main group subdivided into 2 equal subgroups (Vitaenamic endocrown & Emax endocrown) n=8. The restorations were cemented using dual cure resin cement, then the specimens were subjected to thermocycling (TC). The vertical marginal gab was measured using a digital microscope .
Results:
The results showed that there was significant difference in the vertical marginal gap after thermocycling in all groups except composite with vita enamic group showing better marginal adaption than other groups and there was no significant difference in the marginal gab between the control side (tooth endocrown interface) and another side (tooth composite, tooth biodentine interface.
Conclusion:
Margin elevation technique by placement of a composite filling and biodentine in the proximal box before insertion of ceramic indirect restorations results in marginal integrities not different from margins of ceramics placed in dentine.

KEYWORDS
CAD /CAM, ceramic endocrown restorations, subgingival margin, deep margin elevation technique; marginal integrity