Effect of coffee on color stability and surface roughness of newly introduced single shade resin composite materials

Table 3 Descriptive statistics of all groups regarding surface roughness at baseline, after one day, and after 14 days and comparison between different intervals within each group

		Min	Max	M	SD	P Value (One Way ANOVA test)
Omnichroma coffee O1	Baseline	0.096	0.127	0.110^a	0.010	< 0.0001*
	After 1 day	0.267	0.536	0.390^b	0.090
	After 14 days	0.238	0.760	0.530^c	0.140
Venus Peral Coffee V1	Baseline	0.011	0.429	0.260^a	0.120	< 0.0001*
	After 1 day	0.333	0.646	0.491^b	0.090
	After 14 days	0.391	0.738	0.590^c	0.090
Omnichroma distilled water O2	Baseline	0.018	0.224	0.12^a	0.060	< 0.0001*
	After 1 day	0.024	0.270	0.15^a	0.080
	After 14 days	0.148	0.503	0.303^b	0.100
Venus Peral distilled water V2	Baseline	0.009	0.390	0.231^a	0.110	< 0.0001*
	After 1 day	0.034	0.483	0.240^a	0.120
	After 14 days	0.231	0.642	0.406^b	0.120

Min Minimum, Max Maximum, M Mean, SD Standard deviation
^*Significant difference as P < 0.05
Means with different superscript letters were significantly different as P < 0.05
Means with the same superscript letters were insignificantly different as P > 0.05
^a, ^b and ^c letters describes the significance determined by Turkey's post hoc test for multiple comparisons

ISSN: 1472-6831