Shear Bond Strength of Adhesively Bonded Hybrid Ceramic
Objectives: To analyze the effect of surface etching on shear bond strength of hybrid ceramic to a composite resin cement.
Methods: Standardized hybrid ceramic specimens (VITA ENAMIC, Vita Zahnfabrik, Bad Säckingen, Germany) with dimensions of 10 mm x 5 mm x 17 mm were prepared. A machined surface was simulated by a finishing process with 320 grit SiC sandpaper. The specimens (n = 10) were etched with 5% HF (VITA CERAMICS ETCH, Vita Zahnfabrik, Bad Säckingen, Germany) for 20, 40 or 60 s, respectively. Specimens without etching served as control. After surface treatment an adhesive (Scotchbond Universal, 3M ESPE, Seefeld, Germany) was applied according to the manufacturer’s instructions. Subsequently, a composite resin cement (RelyX Ultimate, 3M ESPE, Seefeld, Germany) was applied to the specimens, using a mold with a diameter of 5.0 mm and a height of 2.5 mm. Shear test according to DIN EN ISO 10477 was performed with a crosshead speed of 1mm/min in a universal testing machine (Zwick/Roell, Ulm, Germany). The surfaces were analyzed by SEM (EVO MA10, Carl Zeiss, Oberkochen, Germany).
Results: Shear bond strength of the ground specimens was 23.2 ± 7.6 MPa (control). Etching for 20 s as well as an extended etching time up to 60 s did not increase the shear bond strength. SEM analyzes showed a characteristic etching pattern with an affected ceramic phase and a persisting resin network, providing undercuts in the micrometer scale for a mechanical interlocking with the cement.
Conclusions: Etching of the hybrid ceramic with 5% HF provides undercuts in the micrometer scale, which might improve the mechanical interlocking with the cement. However, etching does not increase shear bond strength of the resin composite cement under investigation.
Division: IADR/AADR/CADR General Session
Meeting:2015 IADR/AADR/CADR General Session (Boston, Massachusetts) Location: Boston, Massachusetts
Year: 2015 Final Presentation ID:3525 Abstract Category|Abstract Category(s):Dental Materials 3: Ceramic-based Materials and Cements
Authors
Coldea, Andrea
( VITA Zahnfabrik
, Bad Säckingen
, Germany
)
Just, Benjamin
( VITA Zahnfabrik
, Bad Säckingen
, Germany
)
Bojemueller, Enno
( VITA Zahnfabrik
, Bad Säckingen
, Germany
)
Fischer, Jens
( VITA Zahnfabrik
, Bad Säckingen
, Germany
; Institute for Material Sciences and Engineering, University Hospital of Dental Medicine, University of Basel
, Basel
, Switzerland
)
Financial Interest Disclosure: A. Coldea, B. Just, E. Bojemüller, and J. Fischer are employees of VITA Zahnfabrik, Bad Säckingen, Germany.