Which imaging modality provides three-dimensional assessment of dental structures and is often used to evaluate complex root canal morphology?

• A. Periapical radiography
• B. Panoramic radiography
• C. Cone-beam computed tomography (CBCT)
• D. Lateral cephalometric radiography

Answer: (C)

Three-dimensional imaging provides a complete view of dental structures in all planes, which is essential when assessing root canal morphology that often includes additional canals, unusual curvatures, or calcifications. Cone-beam computed tomography creates a volumetric dataset that can be sliced into axial, coronal, and sagittal views, letting you visualize canal morphology, canal orifice location, isthmuses, and the spatial relationship to surrounding anatomy. This level of detail is not available on standard 2D radiographs, such as periapical radiographs, which show a single projection and can misrepresent overlapping structures; panoramic radiographs also produce a flat image with magnification and distortion; lateral cephalometric radiographs are focused on skeletal/dental relationships in a side view and not optimized for detailed internal tooth anatomy. Therefore, for evaluating complex root canal systems, CBCT is the imaging modality that provides the necessary three-dimensional assessment.