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Azerbaycan Saytlari

 »  Home  »  Endodontic Articles 6  »  C-shaped root canals in mandibular second molars in a Saudi Arabian population
C-shaped root canals in mandibular second molars in a Saudi Arabian population
Materials and methods.



One hundred and ¢fty-one mandibular second molars scheduled for root-canal treatment were examined over a 1-year period in the Endodontic Department, King Fahad National Guard Hospital, Riyadh, Saudi Arabia. The incidence of C-shaped canalswas revealedfollowing radiographic and clinical examination. Three preoperative radiographswere takenat a constant target-¢lmdistance and angulation by utilizing the extension cone paralleling device (Rinn Corp., Elgin, III, USA): onewith a908 angulation to the tooth ina buccolingual direction and another two at a mesial and distal angulation of approximately 208 to allow better visualization of the buccolingual anatomy.The radiographs were examined on a viewer using a peripheral block and a 6_magnifying lens.The numberand the positionof root canalswere noted. Three postoperative radiographs using the same exposure geometry were taken to con¢rm canal configuration.
Clinical examination of the pulp chamber and canal orifices was carried out and root canals were investigated with size 10 K-¢les (Kerr Co., Romulus, MI, USA); radiographs were taken to con¢rm canal morphology. Once C-shaped anatomy was recognized, teeth were categorizedusingamodi¢cationof anexisting classi¢cation (Melton et al.1991).

  • Category I: continuous C-shaped canal running from the pulp chamber to the apex (Fig. 2).
  • Category II:‘semicolon’ (;) shaped orifice inwhich dentine separated a main C-shaped canal from onemesial distinct canal (Fig. 3).
  • Category III: subdivision I, C-shaped orifice inthe coronal third that divided into two or more discrete and separate canals that joined apically (Fig. 4); subdivision II, C-shaped orifice in the coronal third that divided into two or more discrete and separate canals in the mid-root to the apex (Fig. 5); and subdivision III, C-shaped orifice that divided into two or more discrete and separate canals in the coronal third to the apex (Fig. 6).

Figure 2. Category I: (A) preoperative radiograph of the mandibular second molar showing fused roots and (B) completed root filling using lateral condensation of gutta-percha showing true C-shaped canal.

preoperative radiograph of the mandibular second molar showing fused roots

Figure 3. Category II: (A) preoperative radiograph showing a radicular fusion, a large distal canal, a narrow mesial canal, and a blurred image of a third canal in centre; (B) postoperative radiograph. Note the presence of dentine separating a mesial canal from the rest of the C-shaped canal.

preoperative radiograph showing a radicular fusion, a large distal canal, a narrow mesial canal, and a blurred image of a third canal in centre

Figure 4. (A) Preoperative radiograph of a mandibular second molar and (B) postoperative radiograph. Note the apical fusion of the three canals.

Preoperative radiograph of a mandibular second molar and postoperative radiograph

Figure 5. (A) Preoperative radiograph of a mandibular second molar and (B) postoperative radiograph. Note the main C-shaped canal splits near themid-root into three canals.

Preoperative radiograph of a mandibular second molar and postoperative radiograph

Figure 6. (A) Preoperative radiograph of a mandibular second molar and (B) postopertive radiograph. Note the main C-shaped canal splits in the coronal third into three canals.

Preoperative radiograph of a mandibular second molar and postopertive radiograph