. 2020 Jun 1;21:14. doi: 10.1186/s40510-020-00314-8

Table 4.

Time-related differences in the levels of bacteria with respect to surface type

	Day 1 (T1)	Day 4 (T2)	Significance†		P value for interaction
	Day 1 (T1)	Day 4 (T2)	Treatment	Time	P value for interaction
Streptococcus mutans (Log₁₀/cm²)
BI^a	4.29 ± 0.22	5.22 ± 0.53	AD < BI = ET	T1< T2	0.388
ET^b	4.47 ± 0.36	5.31 ± 0.39
PR^c	4.05 ± 0.44	5.01 ± 0.27
AD^d	3.96 ± 0.37	4.49 ± 0.59
Porphyromonas gingivalis (Log₁₀/cm²)
BI^a	3.23 ± 0.31	2.82 ± 0.30	AD < BI = ET PR < ET	T1 > T2	0.905
ET^b	3.48 ± 0.40	3.14 ± 0.44
PR^c	2.80 ± 0.28	2.52 ± 0.53
AD^d	2.57 ± 0.17	2.36 ± 0.63
Total bacteria (Log₁₀/cm²)
BI^a	7.06 ± 0.34	7.99 ± 0.24	AD = PR < BI = ET	T1 < T2	0.104
ET^b	7.25 ± 0.36	8.11 ± 0.33
PR^c	6.90 ± 0.48	7.70 ± 0.24
AD^d	6.87 ± 0.26	7.34 ± 0.42

^†Two-way ANOVA was used to determine significant differences between the two time points using the Bonferroni correction at a significant level of α < 0.05

^aUntreated bovine incisor

^bEtched bovine incisor

^cPrimed bovine incisor

^dTransbond XT adhesive