In vitro study of effects of aging and processing conditions on colour change in maxillofacial silicone elastomers

Table 6 Comparison of ∆a*values for all study groups

Molding-stone colour	a*values	100 °C group	25 °C group	^ap_diff.
Molding-stone colour	a*values	Mean ∆a* ± sd	Mean ∆a* ± sd	^ap_diff.
Control	∆a*	− 0.21 ± 0.26	0.03 ± 0.27	0.158
Control	^cp	0.110	0.809	0.158
Yellow	∆a*	0.14 ± 0.30	0.05 ± 0.16	0.394
Yellow	^cp	0.166	0.353	0.394
Green	∆a*	0.38 ± 0.19	0.12 ± 0.27	0.018*
Green	^cp	< 0.001*	0.204	0.018*
White	∆a*	0.72 ± 0.36	0 ± 0.17	< 0.001*
White	^cp	< 0.001*	0.936	< 0.001*
Blue	∆a*	0.05 ± 0.29	0.18 ± 0.19	0.262
Blue	^cp	0.601	0.016*	0.262
Reddish-Brown	∆a*	− 0.94 ± 0.27	− 1.18 ± 0.32	0.083
Reddish-Brown	^cp	< 0.001*	< 0.001*	0.083
^bp		F: 76.177, p < 0.001*	F: 46.616, p < 0.001*
^‡Post-hoc		p	p
Control vs. yellow		0.313	0.999
Control vs. green		0.003*	0.999
Control vs. white		< 0.001*	0.999
Control vs. blue		0.999	0.999
Control vs. reddish- Brown		< 0.001*	< 0.001*

^aIndependent sample t-test, ^bOne-way ANOVA, ^cPaired t-test, ^‡Bonferroni-corrected p values,*p < 0.05
P-values set in boldface indicate statistical significance

ISSN: 1472-6831