Indications for all-ceramic restorations on zirconia oxide basis

Zirconia oxide new prosthetic materialThe zirconia oxide stabilized by yttrium oxide offers except for its extremely high strength also the advantage that it is white, light-permeable material. Furthermore, its excellent biocompatibility and low thermal conductivity make it to be an ideal material for accurate prostheses.
Indications

All-ceramic restorations on zirconia oxide stabilized by yttrium oxide basis which were produced by Cercon system are recommended for the following indications:

  • single crowns
  • 3 - segment bridges
  • 4 - segment bridges
  • 5 - segment bridges
  • 6 - segment bridges
  • bridges with max. 48 mm anatomical length in frontal and lateral part

Those indications are ensured by the results of the continuous clinical monitoring.

With corresponding preparation it is possible to fabricate also partial crowns.

Prevention of framework expositionCercon restorations shall be fabricated as all-surface covered crowns and bridges. On the basis of the narrowed intraoral polishing of zirconia oxide and its increased abrasion in comparison with stock dental ceramics, it is necessary to prevent the framework exposure.
Clinical advantages

Due to the high strength of the framework material Cercon restorations can be tested not only after the framework fabrication (cemented) but also after covering. The clinical procedure is thus simplified against all-ceramic restoration bonded by adhesive and offers the following advantages:

  • test with occlusion control
  • temporary cementing
  • conventional cementing
Construction design - decisive for clinical successThe observation of the following parameters with the construction design is decisive for the clinical success: minimum occlusive and axial width of the structural wall shall not be less than 0.4 mm. Connector surfaces at bridge frameworks shall have the minimum cross-section area of 9 mm2.
Not recommended yet

The fabrication of adhesive and extenených bridges though technically possible with Cercon system is still not sufficiently clinically verified. On the basis of the continuous clinical observations the fabrication of adhesive bridges (Maryland) and extenených bridges is not recommended.

There has not been submitted any satisfactory information on clinical success of the divided Cercon bridge frameworks which would enable routine operation.


Contraindications
  • inlays
  • root posts