Table 1. The Mean SBS (MPa) of the Samples Subjected to Different Surface Treatments .
| Group | N | Mean ± SD |
| Er:YAG laser | 20 | 14.4 ± 1.7 |
| CO2 laser | 20 | 10.6 ± 1.9 |
| Control | 20 | 7.7 ± 1.8 |
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