Background: The putty viscosity of PVS material offers several advantages for single-step border moulding. However, a common problem is the thick overextended borders related to its viscosity and also due to the application of uneven thickness of putty material on the tray borders, which is commonly associated with the hand-roll application technique.
Aim and objective: To propose a reliable technique for applying even thickness of putty polyvinyl siloxane (PVS) impression material in one go and at a lower viscosity for single-step border moulding using a modified dental impression dispensing gun system.
Technique: One of the outlets of an empty PVS impression cartridge is modified to a diameter of 4 mm. A homogenous mix of putty PVS is loaded into the modified cartridge and the gun is activated. On activation, a uniform thickness of putty can be dispensed onto the custom tray borders to carry out single-step border moulding. The viscosity of such dispensed material is also low due to the shear-thinning phenomenon.
Conclusion: A simple alternate technique of single-step border moulding using putty PVS and a modified dental impression dispensing gun system has been described. The technique is reliable, based on commonly used equipment, and also cost-effective.
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