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Charles R. Baker Memorial Library Display Case Items Pretreatment: Pin-and-Tube Appliance for First Premolar Extraction Stage 2: Treatment Progress Model Stage 3: Treatment Progress Model These plastic models show the progression of treatment for a severe Class II malocclusion. Hawley Removable Retainer Inventor: Dr. Charles A. Hawley (1861-1929) Early 1900’s The Hawley removable retainer is an appliance for maintaining the position of the teeth after corrective measures have been completed. These retainers are Dr. Hawley’s original demonstration material and were presented to the American Association of Orthodontists by Dr. Carlotta A. Hawley, Dr. Hawley’s daughter.


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