| Summary: | Composite resin restoration in conservative dentistry has been widely used
in conservative dentistry . Although its properties have been enhanced in the past
few decades, composite resin properties still have disadvantages which lead to
restoration failure that needs repair. Thus, surface treatment is needed to increase
bond strength between aging composite with new composite resin in repair
procedure.
The purpose of this study is to reveal the shear bond strength differences
between the aplication of adhesive agent, surface roughening with diamond bur,
and air abrasion of the new composite resin to aging composite resin.
Thirty composite resin blocks were prepared and then stored in an
incubator with 37º C temperature for over a week, continued with thermocycling
procedure between 5ºC and 60ºC. The speciments then being randomly divided
into three groups according to the following surface treatments: 37% acid etching
and adhesive agent application for the first group, surface roughening using
diamond bur followed by 37% acid etching and adhesive agent application for the
second group, and then air abration followed by 37% acid etching and adhesive
agent application for the third group. The effect of each surface treatment on the
bond strength was determined by a shear bond strength test. Data were analysed
by one way Anova (p=0,05).
The result of the study showed significant differences on three tested
groups (p<0,05). The shear bond strength on group III(15,89 MPa) were greater
than group II (13,65 MPa) and group I (12,78 MPa) significantly.
The conclusion of this study was that the third group which was treated
with air abration had the highest shear bond strength compared to the other
groups.
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