Answer:
Alloplastic implants: Proplast, silicone
Advantages: Pre-cut, moldable, no donor site morbidity, quicker operating time.
Disadvantages: Extrusion, infection, visibility, easy palpability, inflexible, inflammtory response leading to vast scarring.
One would use cartilage in most nasal surgery first, then bone (cranial bone), and lastly, alloplasts.