Fig. 1.

Modified Langlais classification of BMC based on panoramic radiographs. Normal—single foramen in ramus and one canal traversing the ramus and body of the mandible. Type I—single foramen and two canals in the ramus with one ending distal to the mandibular molars (retromolar canal) and other traversing the body of the mandible. Type IIA—single foramen and two separate canals in the ramus and two separate canals traversing the body of mandible. Type IIB—single foramen and two fused canals in ramus and traversing the body of mandible. Type IIC—single foramen and two distinct canals in the ramus fusing as a single canal to traverse the body of the mandible. Type IIIA—two foramens and two distinct canals in ramus, but only one canal traverses the body of the mandible while the other ends distal to the mandibular molars (retromolar canal). Type IIIB—two foramens and two distinct canals in the ramus and two distinct canals traversing the body of the mandible. Type IV—one or two foramens and three canals in the ramus traversing as one or multiple canals the body of the mandible.