Final answer:
To dry a cast thoroughly, keep it in a ventilated area, use a hairdryer on a cool setting, and apply talcum powder. Avoid getting the cast wet and seek medical advice if it becomes damp.
Step-by-step explanation:
To assist a cast to dry thoroughly, one should ensure it is kept in a well-ventilated area with low humidity, as moisture can slow the drying process. While it's important not to apply direct heat, using a hairdryer on a cool setting can help circulate air around the cast. Additionally, applying a thin layer of talcum powder outside the cast can absorb moisture and help in the drying process. It is crucial to avoid getting the cast wet, as water can weaken the structure of the material. If the cast does become damp, it is advised to seek advice from a medical professional on proper care. The procedure described with the plastic object and water filament does not apply to assisting a cast to dry thoroughly.