The term "crown" is used to describe the portion of your tooth that extends above the gumline - in other words, the portion of the tooth that can be seen in a healthy mouth. It is also used more colloquially to describe the dental procedure of having a prosthetic "crown" placed over a decayed, chipped, cracked, or otherwise damaged tooth.
With this dental procedure code, the prosthetic crown placed over your tooth is constructed of stainless steel, and completely covers the entire remaining portion of the tooth. Unlike custom-made crowns, stainless steel crowns are pre-made (or, pre-fabricated) by a firm that specializes in providing this type of restorative dental product to dentists. For adults, they are primarily used as temporary crowns until which time budget or time permits the installation of a more permanent solution such as a 3/4 noble metal crown, or a porcelain fused to noble metal crown.
Stainless steel crowns are used on teeth outside the "smile-zone," and come in a variety of shapes and sizes that the dentist will experiment with during the crown placement procedure.
To prepare for this type of crown, a dentist will first remove any decayed or weakened areas of the tooth, and reduce its overall shape to accommodate the crown. The dentist will then test the different sized crowns on your teeth until the correct size is found. Further adjustments may then be made to the crown itself in order to achieve a secure fit. Once the dentist is satisfied with the fit of the crown, and your bite, the crown will be cemented in place.