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Table 1 Comparison of microbial contamination between the different study groups at the baseline phase

From: In vitro evaluation of microbial contamination and the disinfecting efficacy of chlorhexidine on orthodontic brackets

Groups Microbial contamination P value
Absent, n (%) Present, n (%)
Group 1 17 (56.7) 13 (43.3) < 0.001*
Group 2 23 (76.7) 7 (23.3)
Group 3 13 (43.3) 17 (56.7)
Group 4 6 (20.0) 24 (80.0)
Group 5 10 (100.0) 0
Group 6 0 10 (100.0)
  1. Group 1, American Orthodontics brackets; Group 2, 3M Unitek; Group 3, Ortho Organizers; Group 4, China Dental Orthodontic Brackets; Group 5, negative control; Group 6, positive control
  2. *Statistically significant at 95% confidence interval