Biomedical Engineering Reference
In-Depth Information
Cold air-dry
Warm air-dry
(A)
(B)
25
ยต
m
(C)
(D)
FIGURE 7.24
SEM photomicrographs showing less nanoleakage (Ag deposition) after warm air drying of the adhesive.
However, biocompatibility issues and bond stability over longer storage periods should be
addressed before such a technique may be recommended for clinical use.
7.8.6
Improving dental collagen network mechanical properties prior to bonding
Priming acid-etched dentin with glutaraldehyde before application of the adhesive is one of the sug-
gested methods to improve bond strength and durability
[69]
. Glutaraldehyde, a substance that has
been used in the adhesive dentistry field, appears to be a potential element to improve deminera-
lized dentin properties. Its capacity to fix proteins irreversibly
[70]
and to increase the modulus of
elasticity of collagen fibrils
[71]
is of great interest to maintain the collagen structure in position
during bonding. In addition, its well-reported ability to react chemically with collagen and resin
components such as HEMA
[72]
may also contribute to facilitating adhesive system penetration
into and wettability of the dentin substrate.
