Fig. 1From: Apical periodontitis in southern Estonian population: prevalence and associations with quality of root canal fillings and coronal restorationsOverview of the study subjects. Altogether 3584 subjects with AP were investigated (of them 2021 had pAP at least in one tooth and 2920 had sAP at least in one tooth) as well as 2968 subjects without current AP. Legend: AP, apical periodontitis; pAP, primary AP; sAP, secondary AP; RCT, root canal treatment; hRCT, healthy RCT in other teeth; +, present; −, absentBack to article page