An inlay restoration is a custom-fabricated indirect restoration placed within the cusps of a posterior tooth to repair moderate decay or structural damage that is too extensive for a reliable direct filling yet does not require the full-coverage reduction of a dental crown. Unlike chairside composite restorations, an inlay is manufactured outside the mouth — either in a dental laboratory or via CAD/CAM milling — and then permanently cemented or adhesively bonded into the prepared cavity.
Why Inlay Restorations Matter
Inlays occupy a critical middle ground in restorative dentistry. When carious lesion removal leaves a cavity too large for a stable direct restoration, an inlay preserves significantly more natural tooth structure than a crown preparation would require. This conservative philosophy protects the underlying dentin, maintains long-term structural integrity, and reduces fracture risk under occlusal loading. Because the restoration is fabricated under controlled laboratory or milling conditions, it also delivers superior marginal adaptation, surface finish, and interproximal contact accuracy compared to most direct alternatives.
Common Inlay Materials
- Ceramic (porcelain or zirconia): Highly aesthetic and stain-resistant; zirconia variants withstand heavy posterior occlusal forces reliably.
- Gold alloy: Exceptionally durable, biocompatible, and wear-compatible with opposing enamel — historically the benchmark for posterior restorations.
- Composite resin: Tooth-colored and moderately durable; a cost-effective option for lower-stress zones or esthetically sensitive patients.
The Inlay Procedure
Treatment typically spans two appointments. At the first visit, the clinician removes all decay, shapes the cavity to defined geometric walls that will retain the restoration, and captures either a digital intraoral scan or a physical impression. A provisional restoration protects the prepared tooth during the fabrication interval. At the second visit, the inlay is tried in, adjusted for fit and occlusion, and definitively bonded in place.
Precise occlusal equilibration at delivery is essential — uncorrected premature contacts concentrate stress at the restoration margins and increase the risk of fracture or debonding over time. With accurate fit and proper home care, an inlay restoration can remain functional for 15 to 30 years, making it one of the most tissue-conservative and long-lasting solutions available for moderate posterior tooth damage.