[Retracted] EDTA Combined with C-Pilot Files and Microultrasound for Root Canal Calcification: Dredging Effect and Safety Analysis

Table 3

Comparison of success rate of root canal dredging in different calcified sites.

	Upper root canal	Middle root canal	Root apex	Overall success rate
Control group	79.03 (49/62)	53.49 (23/43)	63.16 (12/19)	67.74%
Research group	91.30 (63/69)	78.95 (30/38)	91.30 (21/23)	87.69%
	3.966	5.781	4.896	14.700
	0.046	0.016	0.027	<0.001