Idiopathic/Progressive Condylar Resorption: An Orthodontic Perspective

Idiopathic condylar resorption (ICR), which is alternatively called progressive condylar resorption (PCR), is an uncommon aggressive form of degenerative disease of the temporomandibular joint (TMJ). It is usually encountered in adolescent and young females, although it has also been observed in males. Pathognomonic features of this condition include a loss of condylar mass, thereby decreasing the height of the ramus and length of the mandible, and an opening rotation of the mandible resulting in a Class II open bite.