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
Ureteric stent is instilled into the urethra. Since no intravenous line is inserted and there is no anesthesia, you do not have to be accompanied by anyone else and you can eat normally before and after the procedure. A ureteric stent may also be retrieved without the use of a cystoscope by means of a magnetic removal system. The stent inserted has a small rare earth magnet attached to its bladder end which dangles freely within the bladder. When the stent needs to be removed a small catheter with a similar magnet is inserted into the bladder and the two magnets connect