Wear of Vita Ambria Only Restoration Compared With IPS Emax Onlay Restoration

Inclusion Criteria: * The patient is healthy. * 18-50 years old. * Normal occlusion. * Good oral hygiene. * Tooth with complete root apex. * Tooth with moderate coronal decay. Exclusion Criteria: • Patient Incapable of self-care, mental illness, undergoing radiotherapy, diabetic patient, allergy to one of the materials used, pregnancy, smoker, parafunctional habits, poor oral hygiene, severe periodontitis, tooth need vital pulp therapy or surgical crown lengthening or marginal elevation, tooth with enamel or dentin hypoplasia or hypocalcification, Mallaligned or malformed teeth and adjacent or opposing teeth are missed.