In vitro fracture resistance of three commercially available zirconia crowns for primary molars.

Purpose: The purpose of this study was to measure the fracture resistance of primary mandibular first molar zirconia crowns from three different manufacturers-EZ Pedo (EZP), NuSmile (NSZ), and Kinder Krowns (KK)-and compare it with the thickness of the zirconia crowns and the measured fracture resistance of preveneered stainless steel crowns (SSCs).

Methods: The thickness of 20 zirconia crowns from three manufacturers were measured. The mean force required to fracture the crowns was determined.