Research Article

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

Figure 4

SEM photomicrographs of fracture surfaces at X50 magnification (a–f) indicated fracture origin (O), mirror zone (Mr), mist zone (Mi), hackle zone (H), and arrest line (a–f) of zirconia crown fabricated with light chamfer (a, c, e) and heavy chamfer (b, d, f), in accordance with no collar (a, b), low collar (c, d), and high collar (e, f).
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