GC EUROPE G-aenial Bond - Manual (Page 20)

20 G-ænial Bond Technical Manual
7.2.3 Qualitative influence of etching on bond strength to dentine
the following tests were performed to further assess the influence of etching on the quality of the
dentine-adhesive interface and its potential for chemical adhesion.
SEM observation of failure modes in dentine
Tests performed by M. Derbanne, S. Le Goff and M. Degrange†, Paris, France
Following the shear test (test set-up page 18 ), samples from each batch were observed using
scanning electron microscopy in order to assess the fractured surfaces; the Sem images can be
seen in Figure 15 and Figure 16.
technique etching Rinsing & drying air drying application Wainting air drying light-curing
Self-etch / / light apply + brush 15 s 10 s 5 s 5 s
etch-and-rinse
“dry bonding”
15 s 30 s light + stronger on
enamel (chalky
effect)
apply + brush 15 s 10 s 5 s 5 s
etch-and-rinse
“wet bonding”
15 s 30 s light +
humidification with
cotton pellet
apply + brush 15 s 10 s 5 s 5 s
Figure 15: Fracture surface, G-ænial Bond, etch-and-rinse, Dentine. Source: adapted excerpt from Prof. m. Degrange†,
univeristy Paris Descartes, France, 2010
When an etching agent was used prior to application of G-ænial Bond, the fracture surface was
observed to differ in samples that were wet bonded treatment (where the dentine is left humid
prior to adhesive application) compared to those that were dry bonded (where dentine is dried
prior to application of the adhesive). Dry bonding (Figure 15 a) appears to provide less infiltration
of the adhesive into the collagen network compared to wet bonding (Figure 15 b). in both cases,
however, the visible collagen network indicates that adhesive infiltration into the collagen
network remained incomplete when etching was used. Some collagen fibers remained
unprotected and at risk for degradation over time.
Fig 15 a: G-ænial Bond, etch-and-rinse,
dry bonding
Fig 15 b: G-ænial Bond, etch-and-rinse,
wet bonding