Effect of glaze powder coating on adhesion of resin cements to zirconia ceramic
Wong, Peng Sim

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Wong, P. S. (2015). Effect of glaze powder coating on adhesion of resin cements to zirconia ceramic (Thesis, Doctor of Clinical Dentistry). University of Otago. Retrieved from http://hdl.handle.net/10523/6002
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http://hdl.handle.net/10523/6002
Abstract:
Objectives
The current recommended protocol for bonding zirconia restorations to teeth involves the use of an adhesive system containing phosphate monomers. But there is limited evidence that phosphate monomer produces a bond comparable to an etched silanised glaze layer on zirconia. This study evaluated the effect of using an etched and silanised glazed porcelain layer on the interfacial fracture toughness between a zirconia ceramic and resin cements. The effect of a phosphate monomer primer on resin bond to glazed zirconia was also used in this study.
Methods
Forty rectangular-shaped yttrium stabilised zirconia ceramic plates (VITA In-Ceram YZ, VITA, Bad Sackingen, Germany) (length: 20mm; width: 7mm; thickness 2mm) were sintered prior to air abrasion with 100 µm Al2O3 at two bar pressure. Twenty specimens were glazed with Akzent Glaze Spray (VITA Zahnfabrik; Bad Sackingen, Germany) and then etched with 9% hydrofluoric acid for 180 seconds prior to being silanised with Monobond-S (Ivoclar Vivadent; Schaan, Liechtenstein). Glazed and non-glazed specimens (controls) were further divided into two groups (n = 10) and randomly allocated to one of two resin bonding systems, Variolink II and Multilink-Automix (Ivoclar Vivadent). The Multilink-Automix groups were then treated with Metal/Zirconia Primer (Ivoclar Vivadent). Specimens were aged for 24 hours in a 37 °C water bath. Utilising the method described by Cheng et al. (1999), 12mm glass rods were bonded to zirconia plates using the two resin bonding systems and brought to failure using a universal testing machine. Critical plane strain energy values were calculated. The de-bonded specimens were examined under bi-focal optical microscope and scanning electron microscope to determine the mode of failures. Data were analysed using analysis of variance and Dunnett-T3 post-hoc tests with SPSS with a statistical significance set at 5%.
Results
The use of a glazed zirconia surface significantly improved the mean critical plane strain energy value (19.04 J/m2 to 202.35 J/m2) in the Variolink II group (p < 0.05), however there was no significant change (p > 0.05) with the Multilink-Automix Metal/Zirconia Primer group (59.40 J/m2 to 68.51 J/m2). In comparison to Variolink II, the mean value of Multilink-Automix group was significantly higher in the non-glazed group (19.04 J/m2 to 59.40 J/m2) (p < 0.05). Fractographic analysis showed predominantly cohesive (resin-resin) failure for the glazed groups and adhesive (resin-zirconia) failure in the non-glazed groups.
Conclusion
The interfacial fracture toughness for glazed zirconia bonded to Variolink II resin cement was superior to air-abraded zirconia that had been surface treated with a phosphate monomer primer bonded to Multilink-Automix resin cement. The additional application of Metal/Zirconia Primer on a pre-silanised glaze layer reduces the resin bond efficacy.
Date:
2015
Advisor:
Waddell, John Neil; Al-Amleh, Basil; van Vuuren, Wendy-Ann Jansen; Lyons, Karl; Li, Kai Chun
Degree Name:
Doctor of Clinical Dentistry
Degree Discipline:
Oral Rehabilitation
Publisher:
University of Otago
Keywords:
zirconia; glaze; critical plane strain energy; resin bond; fracture mechanics; ceramic; adhesion; fracture toughness; phosphate monomer; silane; acid etch; resin cement
Research Type:
Thesis
Languages:
English
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- Oral Rehabilitation [57]
- Thesis - Doctoral [3035]