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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

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

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 0.074a 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 0.069a,b 0.162
F-BF (G) 10 0.352b,c 0.327
F-BF 10 0.497c 0.746
F-CN (G) 10 0.195 0.244
F-CN 10 0.199 0.289
  1. 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
  2. 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