Figure 1 Presentation of the clinical survival rates depending on the chosen treatment concept within the patient groups.

Figure 2 Clinical success rate of all included roots depending on the tooth position. Mean follow-up intervals = 17.5 months for anterior teeth, 14.2 months for premolars and 13.5 months for molars.

Figure 3 Clinical success rate of root tip resection depending on the material used for retrograde root filling.

Figure 4 Radiological outcome of the treatment success within the patient groups taking into account the radiographic PAI evaluation.

Group	Teeth/roots	Front teeth	Premolars	Molars	Clinical success rate	Radiological success rate
1a	n=14/n=14	n=6	n=7	n=1	85.7%	64.3%
1b	n=8/n=9	n=3	n=2	n=4	77.7%	62.5%
2a	n=15/n=19	n=4	n=6	n=9	78.9%	33.3%
2b	n=11/n=16	n=4	n=1	n=11	62.5%	18.8%
total	n=48/n=58	n=17	n=16	n=25	75.9%	42.0%

Table 1: Showing the patient cohort and related outcomes