Porcelain Fused to Metal PFM (VMK)
Classified according to the metal alloys being used: precious, semi-precious, and non-precious. PFM Crown and Bridge have been tried and tested for decades and offer strength, reliability, aesthetics, and good marginal fit.
Due to their metal foundations, PFM crowns are ideal for posterior teeth that are exposed to large masticatory forces. The foundation of the crown also serves as a supportive structure to tooth structures with extensive damage often caused by caries.
Preparation for PMF crowns require extensive tooth reduction, therefore may not be suitable for younger patients with large pulp chambers.
- Greater compressive and tensile strength
- Minimal wear of surrounding teeth
- Long-term durability
- Strength for long-span bridge
- Ability to block out discoloured underlying tooth structure
The Maryland bridge is a method used to replace a missing tooth, without having to prepare the abutment teeth.
Consisting of a metal framework with one or two metal wings on the side that are prepared to receive a bonding agent for bonding to the abutment teeth.
- Minimal tooth structure needs to be removed.
- Abutment teeth are not damaged.
- Because of the conservative nature of the preparation, the potential for pulp trauma is minimized.
- Anaesthesia is often unnecessary in order to prepare the teeth.
- Less periodontal irritation results in comparison with the conventional bridge
- Only suitable for the replacement of a single tooth
- Over time the metal wings may de-bond, and will need to be re-cemented.
ALL CERAMIC RESTORARTIONS
The IPS e.max® crown is an all-ceramic system that provides excellent aesthetics, durability, and high strength (500 MPa). E.max provides a cosmetic solution for the correction of fractured teeth, root-canal treated teeth, crooked teeth, stained teeth and has a wide indication range:
- Veneers (≥ 0.3 mm)
- Inlays and onlays
- Occlusal veneers, partial crowns
- Minimally invasive crowns (≥ 1 mm)
- Implant superstructures
- Hybrid abutment solutions
- Three-unit bridges up to the second premolar as the terminal abutment
Porcelain Fused to Zirconia PFZ
Combining porcelain with a milled zirconia base producing a crown with great mechanical and optical properties, that exhibit long term stability, PFZ crowns have become a favourite amongst dentists and their patients.
- Outstanding marginal fit as zirconia framework is manufactured using CADCAM
- Tooth preparation similar to PFM
- Superior aesthetics, eliminates grey tinge around gingival margin
- Ideal for 5 & 6 unit bridges, as well as full arch restorations
- PFZ should be avoided in bruxers or patients with parafunctional activities
- Care with case selection for extensive implant-borne zirconia frameworks