• Machinable resin-ceramic composites combine resin and ceramic properties, offering elastic modulus close to dentin and good fatigue resistance, making them suitable for onlay restorations.
• CAD/CAM technology enables efficient chairside fabrication of resin-ceramic onlays, reducing patient visits and improving precision.
• Onlay restorations with resin-ceramic composites preserve more tooth structure compared to full crowns or post-core crowns, aligning with minimally invasive dentistry.
• Strict patient selection and adherence to preparation guidelines are crucial for high success rates, though complications like fracture and debonding remain challenges.