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. 2020 Nov 4;20:304. doi: 10.1186/s12903-020-01294-1

Table 1.

Errors of impressions

F %
Type of error in the finish line
Voids in finish line 72 43.6
Bubbles in finish line 114 69.1
Tear in finish line 29 17.6
Tissue over finish line 19 11.5
Pull or fold in finish line 54 32.7
Inadequate gingival retraction 147 89.1
Type of error in the preparation area
Voids in preparation area 45 28.3
Bubbles in preparation area 54 34.0
Tray show through preparation area 21 13.2
Poor details 149 6.3
Inadequate retention of material to tray 8 4.8
Blood in impression 86 52.1