Table 2.

Comparison of the number of bacteria in different groups with a thickness of 1 m.

Thickness (mm)	Group	P-value ∗
1	Er, Cr:YSGG laser compared to 445 nm diode laser	0.038
	Er, Cr:YSGG laser compared to both erbium and 445 nm diode lasers	0.021
	Er, Cr:YSGG laser compared to control group	0.025
	445 nm diode laser compared to both Er, Cr:YSGG and 445 nm diode lasers	0.001
	445 nm diode laser compared to control group	0.558
	Both Er, Cr:YSGG and 445 nm diode lasers compared to the control group	0.001

 ^∗Mann-Whitney test with Bonferroni correction.