TABLE I.
Number of Teeth Subjected in Each of the Four Test Groups
| Group | <72 hours | 3 months |
|---|---|---|
| Control | 12 | 8 |
| Carbide bur | 8 | 9 |
| Laser at 25 Hz | 7 | 10 |
| Laser at 50 Hz | 17 | 11 |
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