Fig 4. Total bacterial levels for the 4 different test conditions (blue bars) and their respective controls (green bars).

B-T: brushing and overnight storage in water without a cleansing tablet; U-T: ultrasonic cleaning and overnight storage in water without a cleansing tablet; B+T: brushing and overnight storage in water with a cleansing tablet; and U+T: ultrasonic cleaning and overnight storage in water with a cleansing tablet. The statistically significant differences are indicated as follows: *p<0.05, **p<0.01 (after Holm-Bonferroni correction).