“…Hence, the prognosis of AP after surgical endodontic treatment is related to a number of factors, including age [odds ratio (OR), 2.5; confi dence interval (CI), 1.01-6.00], preoperative root-fi lling length (OR, 3.4; CI, 1.34-8.76) and size of the surgical crypt (OR, 1.9; CI, 1.19-3.16) [ 19 ], as well as interproximal bone levels at the treated tooth (OR, 5.10; CI, 1.67-16.21), the type of root-end fi lling material used (OR, 7.65; CI, 2.60-25.27) [ 120 ] and the position of treated teeth (OR, 3.52; CI, 1.78-6.96) [ 103 ]. According to the results of these three prognostic studies, treatment outcome was superior in subjects older than 45 years, in anterior teeth, tooth with inadequate (versus adequate) root canal fi llings, surgical crypt smaller or equal to 1 cm, bone level from the cementoenamel junction more than 3 mm and root-end fi llings with ProRoot MTA.…”