3-Dimensional cone-beam computed tomography superimposition: A review

Traditionally, the superimposition of serial, two-dimensional cephalometric radiographs has been used for the evaluation of growth and treatment effects. Nowadays, the superimposition of cone-beam computed tomography (CBCT) images has become an important tool for three-dimensional (3D) assessment of changes with growth or treatment. However, the assessment of changes with 3D image superimposition poses many challenges such as accuracy and reproducibility. Various methods for the reconstruction of 3D CBCT images have been used in diagnosis, treatment planning, and simulation. In this article, the various 3D CBCT superimposition techniques and relevant evidences are discussed. Furthermore, their clinical applications, benefits, and limitations are addressed.