Table 1. Incidence of aspiration positive in inferior alveolar nerve block injections among three operators.
| Operator 1 | Operator 2 | Operator 3 | Total | |
| Number of injections | 72 | 105 | 182 | 359 |
| Aspiration positive (%) | 13 (18.1) | 16 (15.2) | 26 (14.3) | 55 (15.3) |
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