In vitro comparative effects of alcohol-containing and alcohol-free mouthwashes on surface roughness of bulk-fill composite resins

Table 4 Within group comparison of initial and final surface roughness values (n = 10)

Group	Mean	Std. deviation	t	P value
X-tra fil in water	0.082	0.306	-0.850	0.285¹
X-tra fil in alcohol-free Listerine	0.092	0.491	-0.594	0.567²
X-tra fil in alcohol-containing Listerine	0.135	0.329	-1.299	0.226²
Tetric N-Ceram in water	0.0705	0.191	-1.165	0.274²
Tetric N-Ceram in alcohol-free Listerine	-0.007	0.486	0.048	0.963²
Tetric N-Ceram in alcohol-containing Listerine	0.118	0.349	-1.075	0.310²

ISSN: 1756-0500