Abstract

Introduction:
Minimally invasive posterior restorations (MIPRs) aim to preserve tooth structure while ensuring optimal function and esthetics. Adhesively bonded restorations such as onlays, overlays, and endocrowns provide conservative alternatives to full crowns. The clinical performance of these restorations depends largely on appropriate material selection, preparation design, and bonding procedures.

Methods:
This work presents four clinical situations illustrating different applications of MIPRs: a lithium disilicate endocrown, a zirconia endocrown, a disilicate onlay, and a zirconia overlay. Each case was analyzed regarding indication, preparation strategy, CAD/CAM fabrication, and adhesive luting protocol. Special attention was given to margin management, Immediate Dentin Sealing (IDS), and occlusal integration.

Results:
Clinical observations revealed satisfactory marginal adaptation, occlusal harmony, and esthetic integration in all four cases. Lithium disilicate restorations provided excellent translucency and enamel bonding potential, while zirconia offered enhanced fracture resistance in high-stress situations. IDS improved bonding reliability and reduced postoperative sensitivity. No complications were observed during follow-up.

Conclusions:
The clinical outcomes from these four cases support the reliability of MIPRs as conservative and durable treatment options for posterior teeth. The choice between disilicate and zirconia should be guided by the amount of residual tooth structure, esthetic expectations, and functional demands. Mastery of adhesive techniques remains essential for long-term success.