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)