GC EUROPE Unifil Bond - Manual (Page 12)

GC UniFil Bond Technical manual version 1.10, November 2005,
12/23
monomers.
2) In both cases of medium and low pressure air blow, the results are not
significantly different.
• Relationship between film thickness of GC UniFil Bond and tensile bond
strength to tooth structure.
The film thickness of the bonding agent will vary from case to case, depending on
the manner in which it is applied. To measure if any influence exists on the tensile
bond strength of GC UniFil Bond, tape with varying thickness to mark the surface
area, see protocol above, was used. After application of the primer, bonding agent
was applied up to the level of the tape height.
Within the limitations of this
test it can be concluded that:
Film thickness does not have
an influence on the tensile
bond strength.
Consequence of variables in tooth structures
The achievement of the bond to dentine depends on the penetration of the self-
etching primer and bonding agent into the demineralised dentine surface in order to
form the so-called hybrid layer. This penetration can however be effected by site
and location of the prepared dentinal surface. In the study called ‘An evaluation to
determine the effect of dentin location and tubule orientation on the bond strengths
between UniFil Bond and dentin’ from Phrukkanon S, Burrow MF, Tyas M.J., The
University of Melbourne, GC UniFil Bond was applied to 6 different dentin locations on
extracted human premolars, either parallel or perpendicular to the tubule orientation.
Micro-tensile bond strength measurements were then completed and compared to a
so called one bottle adhesive system, Single Bond, 3M Espe.
Tensile bond st r engt h ( MPa) vs t hickness of bonding agent layer
0 5 10 15 20 25
47 µm
70 µm
120 µm
176 µm
Dent ine
Enamel