Table 1.
Summary of the type, clinical indication, and susceptibility to low-temperature degradation of polycrystalline ceramics.
| Clinical Indication | |||||||
|---|---|---|---|---|---|---|---|
| Framework (F) Monolithic (M) |
Veneer | Partial Coverage Restoration | Full Crown Anterior (A) Posterior (P) |
FDP | Implant Abutment | LTD | |
| Polycrystalline Ceramics | |||||||
| Zirconias | |||||||
| Framework 3Y-TZP | F | - | - | ✓(A/P) | ✓ | ✓ | Y |
| Monolithic 3Y-TZP | M ^ | - | ✓ | ✓ (A/P) | ✓ | ✓ | Y |
| 4Y-PSZ | M | - | ✓ | ✓ (A/P) | ✓ • | ✓ | Y |
| ≥5Y-PSZ | M | ✓ | ✓ | ✓ (A/P) | ✓ • | - | N |
| Multichromatic | M | - | ✓ | ✓ (A/P) | ✓ * | - | Y * |
| Multilayered | M | - | ✓ | ✓ (A/P) | ✓ * | - | Y * |
| Polycrystalline composites (ZTA and ATZ) | F | - | - | ✓ (A/P) | ✓ | ✓ | N |
FDP: Fixed dental prostheses; LTD: Low-temperature degradation; Y: Yes; N: No. * Multichromatic and multilayered indication for FDPs (implant and tooth-supported) and LTD susceptibility depends on its composition. It is always recommended to follow the manufacturers’ instructions. ^ Monolithic zirconia, especially 3Y-TZP, may be partially veneered with porcelain for improved esthetics. • 4Y-PSZ is recommended by most manufacturers for up to three-unit FDPs in the anterior and posterior regions. 5Y-PSZ is recommended for three-unit FDPs in the anterior region or as premolar pontic. It is advised to check the specific material’s instructions for clinical indications.