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Title: 0586 - Influence of Zirconia-surface-treatments on the Adhesion of Self-adhesive Cements

Authors:

Andreas Schedle (Presenter)
Medical University of Vienna

Anna Hauser, Medical University of Vienna
Simon Öppinger, Medical University of Vienna
Stefan Lettner, Medical University of Vienna
Andreas Moritz, Medical University of Vienna

Abstract:

Objectives: To investigate the influence of four different air-abrasion protocols and one glaze-on-technique on the shear-bond strength of two self-adhesive resin cements with or without their respective ceramic primers to zirconia specimens.

Methods: 480 cuboid zirconia specimens (lenght 12mm, thickness 2mm) were milled from cercon-ht blanks (Dentsply-Sirona). 320 specimens were thereafter air-abraded with four different protocols (110µm Al2O3 at 3,5bar, 110µm Al2O3 at 2 bar, 50µm Al2O3 at 2 bar; 50µm Al2O3 at 0,5 bar). 80 specimens were coated with a glaze-on-technique (DCMhotbond-zirconnect, DCM [Hotbond]) according to manufacturer recommendations. Hotbond-specimens were etched with hydrofluoric acid and silanized prior to use. 80 specimens served as controls without pre-treatment. 480 steel-cylinders (ø6mm, cylinder-height 2mm) were treated with Rocatec Plus at 2bar for 20s and Clearfill Ceramic Primer Plus [CCPP], Kuraray (20s) and cemented with two different self-adhesive resin cements (Panavia-SA [Panavia], Kuraray; Calibra-Universal [Calibra], Dentsply-Sirona) on the zirconia specimens under a plunger weight of 20g/mm2 and light cured from 3 sides for 20 sec. Chemically setting at 37°C was allowed for 6min according to manufacturer′s instructions. Cements were used with or without their respective ceramic primers (CCPP; Prime&Bond active [P&Bact], Dentsply-Sirona) when cemented to air-abraded zirconia specimens. Shear-bond strength was evaluated with a universal testing machine (Zwick, crosshead speed 0,8 mm/min). Data were analysed using ANOVA and post-hoc Tukey-tests.

Results: A significant improvement of the shear-bond strength was observed for all investigated air-abrasion protocols (p<0.001 for all groups, Table 1), but no differences between the protocols. A significant effect of the brand of cements was observed. Calibra in combination with P&Bact showed the highest values, followed by Panavia (with and without CCPP) and Calibra without P&Bact. No significant effect of the glaze-on-technique on the shear-bond strength was observed.

Conclusions: Air-abrasion irrespective of the used protocol but not the glaze-on-technique had a significant effect on the shear-bond strenght of self-adhesive cements bonded to zirconia.

Table(s):

Pre-treatment Mean SD n
Control 14.62 5.72 80
Hotbond + HF + silane 18.57 13.88 80
110 µm, 2 bar 20.72 6.49 79
50 µm, 0.5 bar 22.62 7.93 80
110 µm, 3.5 bar 23.04 8.24 79
50 µm, 2 bar 23.25 8.32 82
All 20.51 9.26 480

This abstract is based on research that was funded entirely or partially by an outside source:
This study has been supported in part with materials by Dentsply-Sirona

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: None

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