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Gnathograph: Articulator Mounted Plaster Cast Inventor: B.B. McCollum Patent Date: October 29, 1929 The first articulator was used by a study group so that they could have some kind of instrument on which they could make a face bow transfer and check bites. They would then transfer the casts to a more appropriate instrument that would allow for the axis shift or laterotrusion. It was initially named the “Gnathograph” but the name was changed to “Gnathoscope”. Plaster of Paris Cast 1934 This plaster of paris cast is an example of a diagnostic tool used in the early years of the orthodontic specialty. The cast is from the Medical Museum of the Armed Forces Institute of Pathology. It is part of a series of casts of numerous individual patients, which demonstrate a range of malocclusions in 3-D.


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