What typically contributes to the distortion of an RPD during fabrication?

The distortion of a removable partial denture (RPD) during fabrication is primarily influenced by the improper handling and curing of materials. During the fabrication process, the materials used must be precisely mixed and handled to maintain their intended properties. If the curing process is not followed correctly, such as if the materials are not allowed to cure fully or are exposed to inappropriate temperatures or humidity, they can undergo dimensional changes. This distortion can cause the RPD to not fit properly in the patient's mouth, leading to discomfort and functional issues.

Proper handling is also crucial; if materials are mishandled or subjected to stress before they have hardened, this can lead to irreversible deformation. Therefore, ensuring that the curing and handling protocols are meticulously adhered to is vital for producing an RPD that is not only functional but also maintains its shape accurately throughout its use.