Final answer:
The correct answer is C) Polycarbonate. Polycarbonate crowns are used for temporary coverage on anterior teeth where esthetics are a concern, offering a more natural appearance than other materials.
Step-by-step explanation:
Polycarbonate crowns are pre-formed crowns used for provisional coverage on anterior teeth when appearance is important. These crowns are chosen over other materials like stainless steel or acrylic when a more esthetic temporary solution is required prior to the placement of a permanent crown. Polycarbonate crowns are more translucent than stainless steel, which makes them suitable for anterior teeth where a natural appearance is desirable. They can also be easily trimmed and adjusted chairside, providing a convenient option for both the dentist and patient.