Zirconium stands to be the strongest all-ceramic coping material available today. It is ideal for people sensitive to metal or simply favor esthetics of metal-free restorations. Zirconium crowns and bridges are extremely strong and can be used anywhere in mouth. Zirconium crowns effectively withstand biting pressure of front as well as back teeth grinding. Zirconium crowns and bridges look close to natural teeth and the difference is hard to tell.