ABSTRACT
PURPOSE: To evaluate the effect of universal adhesives on the long-term bond strength to yttria-stabilized tetragonal zirconia polycrystal (Y-TZP). MATERIALS AND METHODS: Polyethylene tubes filled with composite cement containing 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) were adhesively luted to 60 fully sintered Y-TZP slabs (7 x 7 x 2 mm) with or without (control) previous application of a 10-MDP-based adhesive (All Bond Universal, Bisco) - ABU; Clearfil Universal Bond Quick, Kuraray Noritake - CUB; Scotchbond Universal Adhesive, 3M Oral Care - SUA) on the zirconia surface. The bonded specimens were stored in water for 24 h, 6 months, or 1 year and subjected to microshear bond strength testing. The data were analyzed by one-way ANOVA and Tukey's test (p < 0.05). The contact angle was measured after adhesive application to evaluate surface wettability. The adhesive-treated specimens were analyzed with x-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) for chemical characterization. RESULTS: The application of a 10-MDP-based adhesive significantly improved bond strength of composite cement to zirconia when compared to the control group (no adhesive application) (p < 0.05). One-year water storage significantly decreased bond strength for ABU- and CUB-bonded specimens, but not for SUA-bonded specimens. The analysis by XPS and ToF-SIMS showed peaks of carbon, phosphorus, and silicon in all adhesive-treated specimens. CONCLUSIONS: One-year water storage affected the bond strength of composite cement to zirconia when All Bond Universal or Clearfil Universal Bond Quick were used.
Subject(s)
Dental Bonding , Dental Cements , Silicon , Materials Testing , Surface Properties , Dental Materials/chemistry , Water/chemistry , Carbon , Phosphorus , PolyethylenesABSTRACT
ABSTRACT Composite resins are excellent materials for direct restorations in the posterior region, satisfactorily reestablishing esthetics and function. Recently, a new class of composites has been commercialized, the so-called Bulk-fill resins. These resins may be inserted in the dental cavity in increments of 4 to 5 mm thick, and have the advantages of reducing polymerization shrinkage and clinical working time. The aim of this case report was to describe the use of bulk-fill composite resins to restore Class I and Class II cavities by means of two different restorative techniques.
RESUMEN Las resinas compuestas son excelentes materiales para restauraciones directas en la región posterior, restableciendo satisfactoriamente la estética y la función. Recientemente, se ha comercializado una nueva clase de compuestos, las denominadas resinas Bulk Fill. Estas resinas pueden insertarse en la cavidad dental en incrementos de 4 a 5 mm de espesor, y tienen las ventajas de reducir la contracción de la polimerización y el tiempo de trabajo clínico. El objetivo de este informe de caso fue describir el uso de resinas Bulk fill para restaurar las cavidades de Clase I y Clase II mediante dos técnicas de restauración diferentes.