Effect of ozone application on the resin-dentin microtensile bond strength
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2011
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When ozone is used during caries treatment,
bond strength can be compromised by the
release of oxygen. The use of antioxidant
agents neutralizes the free oxygen. The aim of
this study was to evaluate the effects of ozone
and sodium ascorbate on resin-dentin microtensile
bond strength (lTBS). Forty human
third molars were divided into four groups:
Group 1, not treated with ozone; Group 2,
ozone application followed by acid etching;
Group 3, acid etching followed by ozone application;
and Group 4, ozone and application of
sodium ascorbate. Bonded beams (1.0 mm2)
were tested under tension (0.5 mm min 1). The
lTBS values were analyzed using one-way
analysis of variance (ANOVA) and the Tukey
test (p¼0.05). All beams that fractured were
analyzed under stereomicroscopy (403). Group
1 had significantly higher lTBS values than
Group 2 or 3. The lTBS values of Groups 1 and
4 were similar and higher than those of Group
2. The use of ozone in Group 2 resulted in lower
values of lTBS in all conditions evaluated. The predominant failure mode was adhesive. The
application of ozone decreased the lTBS of the
dentin-composite resin interface. These values
were reversed when compared with Groups 1
and 2 when sodium ascorbate was used.
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RODRIGUES, P. C. F. et al. Effect of ozone application on the resin-dentin microtensile bond strength. Operative Dentistry, Constanta, v. 36, n. 5, p. 537-544, 2011.