A crown or bridge with resin veneers has a framework of metal surrounded by tooth-colored resin.
The resin is matched to the natural tooth color, providing natural aesthetics.Resin veneers are less expensive than porcelain veneers, but have similar positive aesthetic properties. They are mainly used in long-term temporaries or secondary telescopic crowns.
Indications (areas of application)
- Long-term temporaries
- Secondary telescopic crowns
As a permanent fixed prosthesis, plastic-veneered crowns and bridges are not suitable because of long-term discoloration and wear of the plastic. In the case of secondary telescopes are removable dentures that can be repaired at any time in a laboratory.
Contraindications
- Occlusal surfaces in the posterior region
The occlusal surfaces in posterior teeth cannot be veneered with acrylic, as it would wear too much or even fracture (break or chip) due to the high stresses of chewing.
The fabrication
First, the tooth or bridge abutment to be restored must be ground by the dentist to accommodate the restoration. The prepared tooth stumps are then cast together with the remaining dentition, and a bite registration is fabricated. If support zones are resolved, a jaw relation determination must be made.
The crown or bridge is fabricated in a laboratory. First, the metal framework is fabricated there. It is modeled in wax on the die, then provided with casting channels made of wax and embedded in investment material in a casting muffle. After the wax is melted out in a hot furnace, the liquefied metal is cast.
The framework can be made of either a gold-containing alloy or non-precious metal alloys. The plastic is then applied to this in layers. In this way it is possible to customize not only the tooth color but also the tooth shape. The acrylic is only applied in the visible area, the oral (inward) parts of the crown or bridge remain uncovered.
Adhesion of the resin to the metal base can be achieved using various techniques:
- Silicoater process – flame pyrolytic coating.
- Silicoater MD process – firing on silicate coatings.
- Rocatec process – tribochemical coating.
In these processes, a silane layer is applied to the metal, which allows the chemical bond of metal to plastic. In addition, retention beads or retention wires are used, which also provide a mechanical bond between the two components.
The finished crown is placed by the dentist using cement.
Benefits
A crown or bridge with resin veneers is usually worn as a long-term temporary restoration to protect the tooth and bridge the gap until a permanent restoration is placed.
Secondary telescopes with acrylic veneers can be repaired quickly and inexpensively in a laboratory if the acrylic is damaged.
They maintain your natural aesthetics, helping you to continue smiling with confidence.
