this study aims to compare the clinical performance of hard hybrid ceramics and composite resin indirect restorations fabricated by CAD/CAM technology for the vital teeth with occluso-proximal cavities. the clinical performance assessed include marginal adaptation primarily and in addition to Color match, marginal discoloration, aesthetic anatomic form, recurrent caries and restoration fracture and post-operative hypersensitivity. the clinical performance will be assessed after the restoration cementation, after 6, 12, 18 and 24 months.
Systematically healthy male or female subjects aged 16 to 50 years.
Patients with good oral hygiene.
Presence of a single vital molar with coronal destruction due to caries, defined as radiographic evidence of caries involving more than 50% of the total dentin thickness with loss of at least one proximal wall.
Cavitary preparation involving loss of at least one proximal walls (mesial and/or distal), with intact buccal and lingual walls, and all cavosurface margins located in enamel.
Presence of systemic diseases (e.g., uncontrolled diabetes, immune disorders).
Current pregnancy or lactation.
Documented allergy to resin-based composites or adhesive systems.
Evidence of pulpal necrosis or previous endodontic treatment in the target tooth.