Table 1: Epidemiologic, clinical and therapeutic parameters of the included teeth (n = 199). Percentages are given among the respective treatment protocol.

Parameter Protocol 1 (n = 106) Protocol 2 (n = 93) p*
Gender
Female
Male
47 (44.3%)
59 (55.7%)
48 (51.6%)
45 (48.4%)
0.305
Age
(years)
1-19
20-29
30-39
40-49
50-59
60-69
70-79
80-80
90+

0
5 (4.7%)
7 (6.6%)
23 (21.7%)
22 (20.8%)
27 (25.5%)
19 (17.9%)
3 (2.8%)
0

1 (1.1%)
4 (4.3%)
3 (3.2%)
12 (12.9%)
25 (26.9%)
21 (22.6%)
26 (28.0%)
0
1 (1.1%)
0.180
Localization
Maxilla
Mandible
46 (43.3%)
60 (56.6%)
36 (38.7%)
57 (61.3%) 		0.503
Teeth
Anterior Teeth
Premolars
Molars
29 (27.4%)
30 (28.3%)
47 (44.3%)
20 (21.5%)
34 (36.3%)
39 (41.9%) 		0.405
Therapy
Initial Therapy
Revision
77 (72.6%)
29 (27.4%)
77 (82.8%)
16 ( 17.2%) 		0.088

* = p values referring to comparison between protocol 1 and 2.
Protocol 1 = NaOCl (+ NaCl + CHX in revision cases)
Protocol 2 = NaOCl + EDTA + PUI (+ NaCl + CHX in revision cases)
CHX = chlorhexidine, EDTA = ethylenediaminetetraacetate, NaCl = sodium chloride, NaOCl = sodium hypochlorite, PUI = passive ultrasonic irrigation)