Crowns or Caps are synonym words that can be interchangeable.
Teeth that have very large fillings or have been broken down can be restored by crown/caps.
Crowns and caps can be fabricated with several different materials.
Examples all metal (all gold), porcelain to metal, or zirconia to porcelain (which gives more natural looking tooth).
Crowns preserve the tooth and function.
All crowns are customized to each patient.