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