Title: NaOCl degradation of a HEMA-free all-in-one adhesive bonded to enamel and dentin following two air-blowing techniques
Authors: De Munck, Jan ×
Ermis, R Banu
Koshiro, Kenichi
Inoue, Satoshi
Ikeda, Takatsumi
Sano, Hidehiko
Van Landuyt, Kirsten
Van Meerbeek, Bart #
Issue Date: Jan-2007
Publisher: Elsevier Ltd.
Series Title: Journal of Dentistry vol:35 issue:1 pages:74-83
Abstract: OBJECTIVE: Phase-separation within HEMA-free all-in-one dental adhesives may result in the entrapment of droplets within the adhesive resin. Strongly air-blowing prior to polymerization, can remove most of these droplets. The objective of this study was to evaluate the effect these droplets may have on the resistance of the adhesive-tooth interface to NaOCl degradation. METHODS: The micro-tensile bond strength (muTBS) to enamel and dentin was determined when a HEMA-free all-in-one adhesive was applied either following a mild or strong air-blowing technique. The bonds were also exposed to an aqueous sodium hypochlorite (NaOCl) solution for 1h, following a recently introduced methodology to mimic in vivo bond degradation. RESULTS: This study revealed that strong air-blowing of the adhesive only resulted in a significantly higher micro-tensile bond strength (muTBS) to dentin, but not to enamel. Likewise, NaOCl only reduced the muTBS to dentin for both the mild and strong air-blowing technique, but again not the muTBS to enamel. Failure analysis by SEM clearly revealed that strong air-blowing is less effective in droplet removal when the adhesive was applied in small and narrow class-I cavities, as compared to when it was applied to flat surfaces. CONCLUSIONS: NaOCl did preferentially dissolve the hybrid layer at dentin, and more for the mild than for the strong air-blowing technique. A strong air-blowing procedure resulted in a more NaOCl-resistant hybrid layer, so that it can be concluded that a HEMA-free one-step adhesive definitely benefits from a strong air-blowing technique.
ISSN: 0300-5712
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Clinical Residents Dentistry
Biomaterials - BIOMAT
× corresponding author
# (joint) last author

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