An In Vitro Evaluation Study of the Geometric Changes of Root Canal Preparation and the Quality of Endodontic Treatment

Table 2

Scores of smear layer removal in coronal, middle, and apical thirds of the root canal.

Scores	Coronal third	Middle third	Apical third
1	90%	81%	0
2	10%	14%	0
3	0	5%	78%
4	0	0	22%
5	0	0	0

—the level of significance.