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| Types | Characteristics |
|---|---|
| Early | PD ≥ 4 mm (bleeding and/or suppuration on probing) |
| Bone loss < 25% of the implant length | |
| Moderate | PD ≥ 6 mm (bleeding and/or suppuration on probing) |
| Bone loss 25% to 50% of the implant length | |
| Advanced | PD ≥ 8 mm (bleeding and/or suppuration on probing) |
| Bone loss > 50% of the implant length |
PD, probing depth.
