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. 2020 Jul 1;151(9):660–667. doi: 10.1016/j.adaj.2020.06.002

Figure 4.

Figure 4

Tracer presence on the different locations of the dental unit and in the operating environment expressed as colony-forming units per square centimeter (CFU/cm2). Mean (standard deviation) values are indicated, and different superscript letters indicate significant differences between groups (Tukey test, P < .05).