Progress in Orthodontics

Table 5 Comparison of microbial presence between the baseline and different phases of decontamination

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

Groups	Time	Absent, n (%)	Present, n (%)	P value
Group 1^	Baseline	17 (56.7)	13 (43.3)	0.02*
	Phase I	10 (76.9)	3 (23.1)
	Phase II	3 (100.0)	0
Group 2#	Baseline	23 (76.7)	7 (23.3)	0.05*
Group 2#	Phase I	7 (100.0)	0	0.05*
Group 3^	Baseline	13 (43.3)	17 (56.7)	0.01*
	Phase I	16 (94.1)	1 (5.9)
	Phase II	1 (100.0)	0
Group 4^	Baseline	6 (20.0)	24 (80.0)	0.002*
	Phase I	18 (75.0)	6 (25.0)
	Phase II	6 (100.0)	0

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
*Statistically significant, ^Cochran’s Q test, ^#McNemar’s test

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