Table 2.
Overview of roughness averages (Ra) and maximum substance loss in the various treatment groups
| Group | Enamel | Cementum | ||
|---|---|---|---|---|
| Ra | Loss | Ra | Loss | |
| 1A | 1.2 µm | None | 1.6 µm | ≤ 20 µm |
| 1B† | 1.5 µm | 0.6 µm | ||
| 2A | 0.6 µm | < 3.0 µm | 0.5 µm | ≥ 20 µm |
| 2B‡ | 0.7 µm | 0.9 µm | ||
| 2C† | 0.8 µm | 0.3 µm | ||
| 3A | 1.0 µm | < 3.0 µm | 1.0 µm | ≥ 40 µm |
| 3B‡ | 0.9 µm | 1.3 µm | ||
| 3C† | 0.9 µm | 0.4 µm | ||
| 3D†,‡ | 1.2 µm | 0.6 µm | ||
Each value represents the mean of five surface samples. Group 1: air polishing with a nonabrasive powder; group 2: ultrasonic scaling; group 3: hand scaling. †Additional rubber-cup polishing with a paste; ‡additional air polishing with a nonabrasive powder.