Surface roughness and oxygen inhibited layer control in bulk-fill and conventional nanohybrid resin composites with and without polishing: in vitro study

Table 3 Comparison of surface roughness before and after polishing of bulk fill and conventional nanohybrid resin composites with and without oxygen inhibited layer control

Polish	Resin composite	n	Median	IQR	K–W	p-value
Before	TNC-BF(G)	10	0.547	0.692	12.776	0.308
	TNC-BF	10	0.503	0.740
	TNC-CN (G)	10	0.466	0.477
	TNC-CN	10	0.581	0.572
	O-BF (G)	10	0.374	0.332
	O-BF	10	0.669	0.830
	O-CN (G)	10	0.514	0.483
	O-CN	10	0.442	0.285
	F-BF (G)	10	0.462	0.267
	F-BF	10	0.660	0.711
	F-CN (G)	10	0.737	0.273
	F-CN	10	0.500	0.394
After	TNC-BF(G)	10	0.159	0.339	29.007	0.002*
	TNC-BF	10	0.243	0.209
	TNC-CN (G)	10	0.145	0.414
	TNC-CN	10	0.074^a	0.138
	O-BF (G)	10	0.137	0.353
	O-BF	10	0.133	0.338
	O-CN (G)	10	0.119	0.256
	O-CN	10	0.069^a,b	0.162
	F-BF (G)	10	0.352^b,c	0.327
	F-BF	10	0.497^c	0.746
	F-CN (G)	10	0.195	0.244
	F-CN	10	0.199	0.289

Different letters were used to indicate significant differences (p < 0.05) between independent pairs, according to Bonferroni post hoc adjustment. However, if two values coincide with equal letters it means that there were no differences between them
n Sample; IQR Interquartile range; K–W Kruskall–Wallis test, *p < 0.05: Significant differences in at least two groups. F-BF Filtek Bulk Fill, F-CN Filtek Z250-XT, TNC-BF Tetric N-Ceram Bulk-fill, TNC-CN Tetric N-Ceram y, O-BF Opus bulk fill APS, O-CN Opallis EA2; CN Conventional nanohybrid, (G) With oxygen inhibited layer control

ISSN: 1472-6831