Table 3.

Comparison of mean hardness (KHN) of three provisional restorative materials in four groups (Kruskal–Wallis test)

PRM	Control		Artificial saliva		Citric acid		Heptane
	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Luxatemp Star	18.18	0.73	17.18 s	0.88	16 s	0.75	14.09 s	0.81
Revotek LC	15.2	0.77	14.04 s	0.53	13.33 s	0.66	11.79 s	0.58
DPI self cure	9.48	1.03	7.08 s	0.52	6.57 s	0.72	4.76 s	0.57

PRM—provisional restorative material; SD—standard deviation; S—significant