C-shaped root canal configuration in maxillary first molars
A 26-year-old Caucasian male patient was referred by the AIDS-centre of the Ghent University Hospital for the treatment of his maxillary left first molar. This tooth was extensively restored with a composite filling and was very mobile. In view of the medical background of the patient, it was decided to extract this tooth. A panoramic radiograph demonstrated the palatal and mesiobuccal root (Fig. 12). The extracted tooth had two separate roots (Fig. 13). The apex of the distal root clearly demonstrated two apical foramina. Upon sectioning the crown, two root canals were identified in the mesiobuccal root and a deep semilunar groove extending from the palatal to the distobuccal aspects of the cavity was present (Fig. 14). The palatal and the distobuccal root canal orifices were identified at a depth of approximately 5 mm in the C-shaped canal. A section through the middle and apical third of the roots confirmed the findings (Fig. 15). A comparison with the anatomy of the contralateral tooth could not be made, as this tooth had already been extracted.
Figure 12.Case 4: preoperative view of the maxillary right first molar. Carious pulp exposure necessitated extraction.
Figure 13.Case 4: (a,b) frontal and distal view on the roots of the tooth. Note the presence of only two roots. There are two apical orifices in the distal root.
Figure 14.Case 4: horizontal section through the pulp chamber showing two orifices in the mesiobuccal root and a semilunar opening connecting the palatal with the distobuccal canal
Figure 15.Case 4: (a,b) horizontal section through the middle and apical third of the roots. There are two separate canals in the apical third.