Effect of Marginal Designs on Fracture Strength of High Translucency Monolithic Zirconia Crowns

Figure 2

Zirconia crown was seated on metal die, loaded vertically from the occlusal surface in a universal testing machine with a round end hard steel punch at a crosshead speed of 0.2 mm/min to induce circumferential hoop stress (CHS) at the crown margin (a, b) until fracture (c). Fracture specimens were further examined microscopically for the analysis of fracture (d).

(a)

(b)

(c)

(d)