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Influence of new universal adhesives and zirconia primer application techniques on zirconia repair
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INTRODUCTION The protocol traditionally used for bonding composite resin to feldspathic ceramic is not effective to promote adhesion to Zirconia. In the last years, different methods have been studied to achieve that purpose. The development of new primers and adhesives containing phosphate monomers (MDP), have shown promising results. OBJECTIVES To investigate the influence of a zirconia primer, with different application protocols, and two new universal adhesives, all containing MDP, on the shear bond strength between resin composite and zirconia. MATERIALS AND METHODS 60 zirconia Y-TZP blocks (Lava™ Frame Zirconia - 3M ESPE, Seefeld, Germany) with standardized dimensions (9.6mm x 9.6mm x 4.8mm) were mechanically conditioned with 50 μm Al2O3 airborne particle abrasion and randomly divided into six experimental groups (n=10) according to the application protocol of the primer or the adhesives used: 1) Z-Prime™ Plus (ZPP) (Bisco, Schaumburg, USA) – 1 coat without light-curing (ZPP-1); 2) ZPP – 1 coat light-cured (ZPP-1-LC); 3) ZPP – 2 coats without light-curing (ZPP-2); 4) ZPP – 2 coats light-cured (ZPP-2-LC); 5) All-Bond Universal™ (Bisco, Schaumburg, USA) (ABU); 6) Scotch-Bond Universal™ (3M ESPE, Seefeld, Germany) (SBU). Universal adhesives were coated to the zirconia specimen surface according to the manufacturer´s recommendations. Two 1.5 mm increments of composite (Filtek™ Z250) were inserted and light-cured, over the primer/adhesive. After 48 h stored in distilled water at 37 °C, shear bond strength test (1mm/min) was performed. Failure mode determination was performed with a stereomicroscope (20x) Meiji Techno EMZ-8TR (Meiji Techno Co., Saitama, Japan), and classified as adhesive or mixed failure. xiv SBS data were analyzed using 1-way ANOVA, followed by Student-Newman- Keuls post-hoc tests (p<0.05). Kruskal-Wallis, followed by LSD method post-hoc tests was used to analyze failure data. RESULTS The mean SBS values ranged from 19,3 MPa (ZPP-1 - 1 coat no light-cured) to 34,9 MPa (SBU). SBU, ABU and ZPP-2-LC groups achieved statistically higher SBS mean values than the other three experimental groups (p<0.05). No statisticallly significant differences (p≥0.05) were found between SBU, ABU and ZPP-2-LC or comparing ZPP-1, ZPP-1-LC and ZPP-2 application protocol. The three groups with the lowest SBS values registered 100% of adhesive failures. Groups with highest SBS values registered adhesives and mixed failures. CONCLUSION The two new universal adhesives were effective in promoting adhesion between composite and zirconia Z-Prime™ plus Should be applied in two coats, followed by light-curring, to promote SBS similar to the new universal adhesives.
Descrição
Tese de mestrado, Medicina Dentária, Universidade de Lisboa, Faculdade de Medicina Dentária, 2012
Palavras-chave
Materiais dentários Teses de mestrado - 2012