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POZ

POZ crowns and bridges are an aesthetically appealing restoration that is made using the press-over technique, in which ceramic is bonded to a zirconia frame. This technique allows for a more accurate fit and is suitable for ZrO2 abutments in addition to crowns and bridges.

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  • One of the specialized ways of using zirconia in dentistry is to fabricate zirconia frames upon which tooth-colored veneering ceramic is bonded with press technique.

  • POZ ingot is a fluorapatite glass-ceramic material which is pressed onto zirconium oxide. Since the fluorapatite crystals are present in various sizes, the interplay of translucency, opalescence, and brightness can be controlled in a targeted fashion and thus results in optimum masking of the less translucent zirconium oxide frameworks.

  • In the press-over technique, the advantages of the press technology (accuracy of fit) are optimally combined with those of the CAD/CAM technology (processing of zirconium oxide). POZ is suitable for a single crown and multi-unit bridge as well as ZrO2 abutments.

  • Two available techniques:

    • Press-on technique – In the press-on technique, a zirconium oxide framework is overpressed with the fluorapatite glass-ceramic ingot
    • CAD-on technique – In the CAD-on technique, a zirconium oxide framework is fused with a milled e.max CAD veneering structure and crystallized.

Validations

Comparison of Translucency

This Bar chart shows the mean values of the three techniques and different translucencies before and after aging. It shows the mean values of translucency before and after aging. With buildup technique, there was a statistically significant decrease in mean after aging. With Press-on techniques as well as CAD-on techniques and high translucency, there was a statistically significant decrease in mean (TP) after aging. Meanwhile, with low translucency, there was no statistically significant change in mean (TP) after aging. (El-Agwany at al., Effect of veneering techniques and subsequent aging on translucency of bilayered zirconia, Future dental journal, 2018, Vol. 4, pp274-278)

Survival Rate (%): 5 Year Results

The estimated cumulative survival rate of the zirconia-based crowns after 5 years (97.73 ± 2.19) was similar to that of the metal-based crowns (97.44 ± 2.39). No statistical differences were detected between the two groups. (Monaco et, al., Zirconia-based versus metal-based single crowns veneered with overpressing ceramic for restoration of posterior endodontically treated teeth: 5-year results of a randomized controlled clinical study, J of Dent, 2017, Vol.65, pp56-63)

Cohesive and adhesive failures of the veneering are recurrent complications of veneered zirconia framework. To counteract this tendency, the overpressing technique has been introduced. Press over zirconia (POZ) technique has a higher strength compared to the layering technique. Using the pressed ceramic may reduce the chipping incidence, since the fabrication method would reduce the formation of large flaws and minimize the thermally induced residual stresses. (E. Daou, The zirconia ceramic: Strengths and weaknesses, ODJ, 2014, Vol. 8, pp33-42)

Thickness Requirements

Cervical area 1.0 mm
Middle area 1.2 mm
Incisal, Occlusal area 1.5 mm
Margin Shoulder or Chamfer
  • The preparation must provide sufficient space to achieve stable and esthetic metal-ceramic restorations.

  • With conventional cementation, a minimum height of 3mm of the prepared tooth and a convergence angle of approx. 6° must be observed.

Indications

  • Crowns and bridges up to 14 units

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