Abstract
Objectives: To evaluate the effect of infrastructure (IS) material on the fracture behavior of prosthetic crowns.
Methods: Restorations were fabricated using a metal die simulating a prepared tooth. Four groups were evaluated: YZ-C, Y-TZP (In-Ceram YZ, Vita) IS produced by CAD-CAM; IZ-C, In-Ceram Zirconia (Vita) IS produced by CAD-CAM; IZ-S, In-Ceram Zirconia (Vita) IS produced by slip-cast; MC, metal IS (control). The IS were veneered with porcelain and resin cemented to fiber-reinforced composite dies. Specimens were loaded in compression to failure using a universal testing machine. The 30° angle load was applied by a spherical piston, in 37°C distilled water. Fractography was performed using stereomicroscope and SEM. Data were statistically analyzed with Anova and Student-Newman-Keuls tests (α = 0.05).
Results: Significant differences were found between groups (p = 0.022). MC showed the highest mean failure load, statistically similar to YZ-C. There was no statistical difference between YZ-C, IZ-C and IZ-S. MC and YZ-C showed no catastrophic failure. IZ-C and IZ-S showed chipping and catastrophic failures. The fracture behavior is similar to reported clinical failures.
Significance: Considering the ceramic systems evaluated, YZ-C and MC crowns present greater fracture load and a more favorable failure mode than In-Ceram Zirconia crowns, regardless of the fabrication type (CAD-CAM or slip-cast).
| Original language | English |
|---|---|
| Pages (from-to) | 578-585 |
| Number of pages | 8 |
| Journal | Dental Materials |
| Volume | 30 |
| Issue number | 5 |
| Early online date | 21 Mar 2014 |
| DOIs | |
| Publication status | Published - May 2014 |
Keywords
- ceramics
- dental materials
- dental restoration failure
- stress, mechanical