Comparison of the clinical efficacy of two different types of post systems which were restored with composite restorations

Table 5 Colour stability on teeth treated with polyethylene fibre posts (n = 31) and zirconia-rich glass fibre posts (n = 31) and direct resin composite restorations n (%)

Time (mo)		6		12		24		36
Materials		Polyethylene	Zirconia	Polyethylene	Zirconia	Polyethylene	Zirconia	Polyethylene	Zirconia
Colour stability	A	31 (100)	31 (100)	28 (90.3)	29 (93.5)	27 (87.1)	28 (90.3)	26 (83.9)	27 (87.1)
	B	0 (0)	0 (0)	3 (9.7)	2 (6.5)	4 (12.9)	3 (9.7)	5 (16.1)	4 (12.9)
	C	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)
		NS		NS		NS		NS

A: No discolouration; B: Slight discolouration; C: Discolouration requiring replacement; NS: Not significant.