Biomedical Engineering Reference
In-Depth Information
Fig. 1. Shear bond strength between the experimental groups.
3.2 SEM (Scanning Electronic Microscopy)
SEM revealed the fractured surface between the composite resin and dentin side, as shown
in Figure 2. The representative SEM evaluation showed that thick layers of the adhesives
were found on the fractured de-bonded surface of the composite resin (Figure 2-B, D, F). On
the other hand, the fractured bonded surface of the dentin by the Clearfil SE bond adhesive
treatment, as a result of the shear bond strength test followed by 37% phosphoric acid
etching of some of the residues of the adhesives remaining on the surface of dentin side after
the shear bond test (Figure 2-A, C, E).
Regarding the failure mode of the control group in the types of adhesive system, some
residual chips were found (A) on the surface of dentin side fractured after 37% phosphoric
acid etching and single bond adhesion but the fractured bonded surface of dentin by the
Clearfil SE bond adhesive treatment as a result of the shear bond strength test followed by
37% phosphoric acid etching showed thick layers of composite resin attached to the dentin
after the failure test (D).
In the irradiation groups, 1.4 W of irradiation followed by the Single bond procedure left the
fractured dentin surface with small particles after the failure test (B). On the other hand, the
fractured dentin surface irradiated with a power intensity of 2.25 W had exposed dentinal
tubules after the test (C). On the other hand, 1.4 W of power intensity irradiation followed
by the SE bond procedure revealed exposed dentinal tubules after the failure test (E),
whereas 2.25 W of power intensity irradiation followed by the SE bond procedure resulted
in a thick layer of composite resin fractured cohesively on the dentin side of the fractured
surface (F).
