Charles Stent Charles Stent Charles Stent (1807–1885) was a 19th-century English dentist notable for his advances in the field of denture making. In 1847, Edwin Truman introduced gutta-percha as a material for making dental impressions; however, this was unsatisfactory for several reasons, including its tendency to distort upon removal from the patient's mouth, and to shrink upon cooling. In 1856, Stent added several other materials to the gutta-percha, notably stearine, which markedly improved the plasticity of the material as well as its stability. He also added talc as an inert filler to give more body to the material, and red colouring. The
Charles Bingham Penrose Charles Bingham Penrose Charles Bingham Penrose (February 1, 1862 – February 28, 1925) was an American gynecologist who invented the surgical drain known as the Penrose drain. Born in Philadelphia, Penrose was the son of a medical school professor and his brothers included Pennsylvania state senator Boies Penrose and geologist Spencer Penrose. The grandson of prominent politician Charles B. Penrose, he married into the wealthy Drexel family of the same city. Penrose was an early advocate for the use of drainage tubes in abdominal surgery. After he contracted tuberculosis in 1891, Penrose left Pennsylvania for Wyoming, hoping that the change