case_images: PMC10027094_01
case_images: (A) Preoperative intraoral X-Ray focused on tooth #47; (B)
  Furcation canal foramen indicated by the arrow; (C) Furcation canal
  after K 06 file in situ; (D) Endodontic filling of the mesiobuccal,
  mesiolingual, distal, and furcation canals; (E) Postoperative
  intraoral X-Ray focused on tooth #47. Endo-restorative continuum
  implemented with a resin composite-build up in the access cavity;
  (F) Intraoral X-Ray at 3 months postoperative. (G) Intraoral X-Ray
  at 8 months postoperative; (H) Intraoral X-Ray at 12 months
  postoperative. Healing of periapical and furcation lesions.
case_images: 1806-4760-bdj-34-01-132-gf1.jpg
case_images: PMC10027094_01_1806-4760-bdj-34-01-132-gf1.jpg
case_images: f1
case_images: X-Ray examination revealed a periradicular and periapical radiolucency of 6.5 mm in diameter at the distal root, as well as a radiolucency below the furcation (Figure 1A). The use of an electronic apex locator (Root ZX mini, Morita, Dietzenbach, Germany) confirmed the patency of this canal with the periodontium (Figure 1B and 1C). After cooling and hardening, the gutta-percha was removed from the pulp chamber with a round tungsten carbide bur (EndoTracer, Komet, Lemgo, Germany) without the air-water spray, leaving only the inlets of the four canals blocked, including the furcation canal (Figure 1D). Post-operative retro-alveolar radiography revealed the filling of the furcation canal (Figure 1E). The periodontal lesion showed signs of clinical and radiographic healing (Figure 1F). At eight months postoperatively, the tooth remained asymptomatic and a 2 mm radiolucent area between the roots persisted (Figure 1G). Periradicular and inter-radicular bone lesions had completely resolved (Figure 1H).
case_images: PMC10027094_02
case_images: (A) Preoperative intraoral X-Ray focused on tooth #47; (B)
  Furcation canal foramen indicated by the arrow; (C) #06 K-file
  instrument inserted into the furcation canal; (D) Endodontic filling
  of the mesiobuccal, mesiolingual, distal and furcation canals; (E)
  Postoperative intraoral X-Ray focused on tooth #47; (F) X-Ray at 12
  months postoperative: healing of periapical and furcation
  lesions.
case_images: 1806-4760-bdj-34-01-132-gf2.jpg
case_images: PMC10027094_02_1806-4760-bdj-34-01-132-gf2.jpg
case_images: f2
case_images: Intraoral radiographic examination revealed a periradicular and periapical radiolucency of 7.2 mm in diameter between the distal and mesial roots and under the furcation area (Figure 2A). A 06-size K-file (K-Files Ready Steel, Dentsply Sirona) was glided into the foramen (Figure 2B to 2D). The postoperative radiograph showed the obturation of main canals, furcation, and lateral canals (Figure 2E). The radiographic examination showed a complete endo-periodontal healing at twelve months postoperative (Figure 2F).