Inlays and Onlays are indirect restorations designed based on the extent of damage to the tooth's chewing surface. If the damage is confined within the cusps, it is called an "Inlay"; if it covers one or more cusps, it is termed an "Onlay." They serve as an ideal conservative solution when traditional fillings are insufficient but a full crown would require excessive tooth reduction.
Treatment Process :
Preparation & Cleaning: Decayed tissues are removed, and the affected area is smoothly shaped to accommodate the digital impression.
Digital Impression: 3D digital models of the tooth are captured using intraoral scanners; this data is sent to the lab for millimetric-precision fabrication.
Temporary Filling: A temporary material is placed to protect the tooth while the permanent ceramic restoration is being crafted.
Laboratory Fabrication: Using CAD/CAM technology, the restoration is carved from high-strength ceramic or hybrid composite blocks to perfectly match the tooth's anatomy.
Final Cementation: The custom-made Inlay or Onlay is chemically bonded to the tooth surface using specialized adhesives, and the marginal fit is verified.
Benefits and Advantages :
Preservation of Tooth Structure: Requires significantly less tooth reduction compared to full crowns, maintaining the tooth's natural integrity to the maximum extent.
Superior Durability: Ceramics or hybrid materials processed in a lab setting are much more resistant to chewing forces than traditional direct fillings.
Precise Marginal Fit: Digital manufacturing ensures zero gaps between the tooth and the restoration, effectively preventing secondary decay.
Aesthetics & Hygiene: Perfectly matches the tooth shade and features a smooth surface that resists staining and minimizes plaque accumulation over time.