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Answer :
Final answer:
The Hawley appliance cannot be fabricated using a vacuum former because it incorporates metal wires and clasps that require manual customization, unlike bleaching trays, retainers, and mouthguards which are made from thermoplastics suited for vacuum forming. so the correct option is (C) Hawley appliance.
Explanation:
A vacuum former is utilized in dental practices to create a variety of custom-fitted dental appliances by heating a sheet of plastic until it's flexible and then using suction to form that plastic around a dental model or mold. Appliances like bleaching trays, retainers, and mouthguards can be easily fabricated using this method as they are generally made of thermoplastic materials that soften with heat and conform to the shape of the teeth.
However, the Hawley appliance typically includes metal wires and clasps, which are not suitable for production using a vacuum former. These components are not only essential for the structural integrity and functionality of the device but also require precise adjustment and customization that cannot be achieved with vacuum forming alone. Instead, the creation of a Hawley appliance involves a more complex and manual process of crafting and fitting its metal components.
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