Craniofacial distraction osteogenesis (CDO) is based on the biologic process of new bone formation between the surfaces of two divided bone segments under the influence of traction forces. The gap between the bone segments is initially filled with collagen fibers that serve as the mesh in which a callus begins to emerge. The process of bone formation is initiated by the application of distraction to the osteotomised segment. The generated tension stimulates new bone formation parallel to the vector of distraction. As distraction proceeds, bone formation advances along the collagen fibers,...