When to Use Each Restoration
Direct Filling (Composite)
- When: Small cavity (less than 1/3 of chewing surface)
- Lifespan: 5-10 years
- One session
Inlay
- When: Medium cavity within cusp boundaries
- Lifespan: 15-25 years
- Made in the lab from porcelain or zirconia
Onlay
- When: Larger cavity involving one or more cusps
- Lifespan: 15-25 years
- Preserves more tooth structure than a crown
Crown
- When: Major tooth damage (more than 2/3)
- Lifespan: 15-20 years
- Covers the entire tooth
The Golden Rule
The more natural tooth structure we preserve, the better the long-term result. That is why we prefer filling → inlay → onlay → crown (from least to most invasive).