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ENDODONTICS of periapical, lateral or interradicular chronical periodontitis (5). The CBCT can provide crucial information even for the identification of small periapical lesions, which cannot be identified on periapical conventional radiograph. Friedman demonstrated that early endodontic treatment increases the succes rate of endodontic treatment, when periapical pathosis was detected on CBCT prior to conventional radiograph, which could not reveal the radiolucency yet (6, 7) . Huumonen proved the accuracy of CBCT in the diagnosis of chronical periapical periodontitis in the case of patients with diffuse pain and inconclusive clinical tests when radiographs showed no pathological modifications (8). Unlike the conventional X ray which gives a two dimensional view, the CT scanner can reveal all the three dimensions, providing accurate informations about the size of the radiolucency. A decrease in size of a periapical radiolucency, even if the lesion is not completely remineralized, is a sign of healing (9). The sensitivity of periapical radiographs is lower compared with the CBCT (10, 11). The radiographic outcome determined with PA radiographs could be untrue (12). Just CBCT makes accurate diagnosis of periapical lesions possible, when a lower dose conventional radiography cannot provide a precise diagnosis. Limited volume CBCT is preferred. The small size of the field of view (FOV), the beam collimation, the shortest time and the smallest voxel decreases the radiation exposure when using CBCT in endodontics. Bibliography 1. Castellucci A. Endodontics volume I, Il Tridente Firenze. 2004; 160-207 2. http://www.studiodentisticovenuti.it/wp-content/uploads/2012/06/ cone-beam-articolo.pdf 3. 3. Patel S. New dimensions in endodontic imaging: Part 2. Cone beam computed tomography, Int Endod J 2009;42(6):463475. 4. Velvart P, Hecker H, Tillinger G. Detection of the apical lesion and the mandibular canal in conventional radiography and the computed tomography, Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2001;92(6):682-688. 5. Garcia de Paula-Silva FW, Hassan B, Bezerra da Silva LA, Leonardo MR, Wu MK. Outcome of root canal treatment in dogs determined by periapical radiography and cone-beam computed tomography scans. J Endod. 2009;35(5):723-726. 6. Lofthag-Hansen S, Huumonen S, Gröndahl K, Gröndahl HG. Limited conde-beam CT and intraoral radiography for the diagnosis of periapical pathology. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2007;103(1):114-119. 100 7. Friedman S. Prognosis of initial endodontic therapy. Endod Top 2002; 2:59-98 8. Huumonen S, Kvist T, Gröndahl K, Molander A. Diagnostic value of computed tomograhy in re-treatment of root fillings in maxillary teeth. Int Endod J 2006;39(10):827-833. 9. European Society of Endodontology. Quality guidelines for endodontic treatment: consensus report of the European Society of Endodontology. Int Endod J 2006;39(12):921-930. 10. Low KM, Dula K, Bürgin W, von Arx T. Comparison of periapical radiography and limited cone-beam tomography in posterior maxillary teeth referred for apical surgery. J Endod. 2008;34(5):557-562. 11. Tsai P, Torabinejad M, Rice D, Azevedo B. Accuracy of cone-beam computed tomography and periapical radiography in detecting small periapical lesions. J Endod. 2012; 38(7):965-970. 12. Metska ME, Liem VM, Parsa A, Koolstra JH, Wesselink PR, Ozok AR. Cone-beam computed tomographic scans in comparison with periapical radiographs for root canal length measurement: an in situ study. J Endod. 2014;40(8):1206-1209. STOMA.EDUJ (2014) 1 (2)