Table 2.

Association between the type of errors and types of impression material

	Impression material						p-value
	Alginate		Addition silicone		Condensation silicone
	F	%	F	%	F	%
Voids in finish line
Yes	59	81.9	3	4.2	10	13.9	0.000
No	25	26.9	31	33.3	37	39.8
Bubbles in finish line
Yes	70	61.4	13	11.4	31	27.2	0.000
No	14	27.5	21	41.2	16	31.4
Tear in finish line
Yes	16	55.2	5	17.2	8	27.6	0.848
No	68	50.0	29	21.3	39	28.7
Tissue over finish line
Yes	6	31.6	5	26.3	8	42.1	0.191
No	78	53.4	29	19.9	39	26.7
Pull or fold in finish line
Yes	22	40.7	9	16.7	23	42.6	0.020
No	62	55.9	25	22.5	24	21.6
Gingival retraction
Adequate	2	14.3	11	78.6	1	7.1	0.000
Inadequate	82	55.8	20	13.6	45	30.6
Supragingival finish line	0	0.0	3	75.0	1	25.0
Total impressions with errors in the finish line
Yes	84	55.3	24	15.8	44	28.9	0.000
No	0	0.0	10	76.9	3	23.1
Retention of material to tray
Adequate	78	49.7	34	21.7	45	28.7	0.308
Inadequate	6	75.0	0	0.0	2	25.0
Voids in preparation area
Yes	31	67.4	4	8.7	11	23.9	0.016
No	53	44.5	30	25.2	36	30.3
Bubbles in preparation area
Yes	35	61.4	7	12.3	15	26.3	0.084
No	49	45.4	27	25.0	32	29.6
Tray show through preparation area
Yes	20	95.2	0	0.0	1	4.8	0.000
No	64	44.4	34	23.6	46	31.9
Poor detailed impressions
Yes	5	50.0	1	10.0	4	40.0	0.633
No	79	51.0	33	21.3	43	27.7
Total impressions with errors in the preparation area
Yes	58	65.2	9	10.1	22	24.7	0.000
No	26	34.2	25	32.9	25	32.9
Blood in impression
Yes	69	80.2	11	12.8	6	7.0	0.000
No	15	19.0	23	29.1	41	51.9