Prospective, Randomized, Clinical Evaluation of Preformed Zirconia Crowns and Stainless Steel Crowns on Permanent First Molars: 12-Month Results.

After 12 months of clinical evaluation, preformed zirconia crowns performed comparably to stainless steel crowns in their ability to restore decayed or hypomineralized permanent first molars. However, zirconia crowns took nearly twice as long to prepare, fit, and cement.