Orthodontics in 3 millennia. Chapter 6: More early 20th-century appliances and the extraction controversy

The trying conditions of the Great Depression and World War II did not deter innovative orthodontists from adding 3 new appliances to our armamentarium. Clinicians become fragmented into various technique “camps.” Silas Kloehn's neck gear became a more patient-friendly version of extraoral anchorage, but it still had drawbacks. Angle's stranglehold on the specialty was finally broken when 3 of his disciples made extractions respectable.