Donly KJ, et al. - In this randomized, controlled clinical trial, the clinical success of a new primary zirconia molar crown compared with stainless steel crowns (SSCs) was evaluated. This is a split-mouth study performed recruiting 53 years to 7-year-old children and providing a total of 50 pairs of teeth requiring primary molar crowns, with each participant receiving an SSC and zirconia crown. The 24-month results of this work demonstrate zirconia primary molar crowns as similar to an established stainless steel crown regarding performance for restoration of primary molar teeth.