Comparing the working time of different die model systems to establish the quickest to perform.
Keyte, Joanna Lauren
Cardiff Metropolitan University
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Objective: The objective of this investigation was to establish which die system – Tray, Pindex or Giroform – obtained the shortest Working time. The hypothesis was that the tray system would be the quickest as it was a simpler system. Method and Materials: For the tray system, the timer recorded the impression and tray being filled with moonstone. Then the impression being inverted onto the tray. For Giroform, the timer noted: the positioning of the impression, the drilling of the base, the placing of the pins, the impression being filled with moonstone and the base being lowered onto the impression. For Pindex the following stages were timed: the pouring of the master model, the trimming of the model, drilling the pin holes, placing the pins/wax and the basing of the model. The method for each die system was repeated 25 times and the times recorded. The setting/ mixing times were excluded. And the methods followed the manufacturers guidelines unless stated otherwise. Results: The results showed that the tray system presented with the shortest time with an average of 3:02 minutes, followed by Giroform with 6:91 minutes and Pindex taking an estimated 8:25 minutes. Conclusion: The results have suggested that the tray system was the quickest to perform yet technicians use a variety of systems. Perhaps the working time would convince some to substitute their current system for one which is quicker but technicians maybe inclined to either continue with methods which they have studied or have other factors affecting their decision.
BSc (Hons) Dental Technology
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