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Figure 3: Management of internal root resorption and open apex induced using MTA cement as root canal filling material (tooth 45). (a) Preoperative intraoral radiograph of the second right lower bicuspids showing an abnormal width of the root canal in the third apical part. (b), (c), and (d) Sagittal, coronal, and axial CBCT cross-sections reveal the thickness reduction of radicular walls without perforation but with an open apex in communication with the internal resorbed part of the canal. (e), (f) To avoid an overextension of materials beyond the apex, the apical part of canal, and the resorption lacuna where both filled with MTA. (g) Clinical view with operative microscope of white MTA placed in the third apical part of the canal. (h) Periapical X-ray: control of treatment at one year. Note the absence of periapical disease and the integrity of the root.