A coned-beam computerized-tomography study performed with the i-CAT 3-D imaging technology (Imaging Sciences International, Hatfield, Pa). Images are shown in 2 dimensions: (A) panoramic slice and (B) cross sections or slices. Note the mandibular canal depicted in slices 45 to 65 and the mental foramen in slice 67. These cross sections correspond to the patient's lower right edentulous region