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Classification of dental bonding systems by generations
| Generation | Number of steps | Surface pretreatment | Components | Shear bond strength (MPa) |
|---|---|---|---|---|
| 1st | 2 | Enamel etch | 2 | 2 |
| 2nd | 2 | Enamel etch | 2 | 5 |
| 3rd | 3 | Dentin conditioning | 2-3 | 12–15 |
| 4th | 3 | Total etch | 3 | 25 |
| 5th | 2 | Total etch | 2 | 25 |
| 6th | 1 | Self-etch adhesive | 2 | 20 |
| 7th | 1 | Self-etch adhesive | 1 | 25 |
| 8th | 1 | Self-etch adhesive | 1 | Over 30 |
MPa – Mega-Pascal
