Table 2.

Relationship of resorption rates of materials in the root canals and roots

	ZOE		Vitapex		MPRCF
	N	%	N	%	N	%
6 months
A	48	94.1	23	41.1	32	68.2
B	0	0	27	48.2	0	0
C	0	0	2	3.6	0	0
D	2	3.9 a	4	7.1 b	21	31.8 ab
E	1	2.0	0	0	0	0
12 months
A	32	62.7	10	17.9	26	49.1
B	0	0	14	25	0	0
C	0	0	28	50	3	5.7
D	3	5.9a	4	7.1b	24	45.2ab
E	16	31.4	0	0	0	0
18 months
A	25	49.0	7	12.5	20	37.7
B	0	0	16	28.6	2	3.6
C	0	0	31	55.4	4	7.5
D	6	11.8a	2	3.5b	27	50.9ab
E	20	39.2	0	0	0	0
Total	51	100	56	100	53	100

A: both no changes, B: root no change but filling resorbed, C: root began resorption, filling resorbed at faster rate, D: root began resorption, filling resorbed at same rate, E: root began resorption, filling resorbed at slower rate

^amean the proportions of resorption at same rate were significantlly different between ZOE group and MPRCF group

^bmean the proportions of resorption at same rate were significantlly different between Vitapex group and MPRCF group