Effect of fluoride iontophoresis on the microtensile bond strength between dentin and two adhesive systems.
J Dent
; 36(9): 697-702, 2008 Sep.
Article
em En
| MEDLINE
| ID: mdl-18555580
ABSTRACT
AIM:
To evaluate the effect of fluoride iontophoresis on the microtensile bond strength (MTBS) between coronal dentin and two resin-based adhesive systems, and to measure quantitatively dentinal tubule occlusion.METHODS:
Twelve freshly extracted intact human mandibular third molars were divided randomly into four groups. The superficial occlusal dentin of each tooth was exposed and treated. Group A1 One-Step Plus total-etch adhesive system; group A2 One-Step Plus total-etch adhesive system after fluoride iontophoresis; group B1 ACE BOND SE self-etching adhesive system; group B2 ACE BOND SE self-etching adhesive system after fluoride iontophoresis. A resin composite buildup was made for each tooth, which was then sectioned along its long axis to produce 10 beams (1.0 mm x 1.0 mm) for the microtensile bond strength (MTBS) test. Five dentin disks were cut in half and their occlusal surfaces etched with 6% citric acid. The test halves were treated with fluoride iontophoresis. Four SEM photomicrographs were taken from corresponding sites on each test and each non-treated control half-disk. Image-Pro Plus 4 software quantified the percentage of tubule occlusion. Data were analyzed using one-way ANOVA, chi(2)- and t-tests, with the probability level set at alpha=0.05.RESULTS:
The mean MTBS (MPa) for each group was, A1 30.86 (S.D. 6.84); A2 25.04 (8.49); B1 19.22 (6.88); B2 19.40 (6.92). There were significant differences among all groups (P < or = 0.02), except between groups B1 and B2 (P=0.92). Fluoride iontophoresis resulted in significantly increased dentinal tubule occlusion (P<0.001).CONCLUSIONS:
Fluoride iontophoresis treatment reduced significantly the dentin bond strength of One-Step Plus total-etch adhesive, but not that of ACE BOND SE self-etching adhesive. However, the bond strength of the former remained significantly higher than that of the latter adhesive system.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Cariostáticos
/
Iontoforese
/
Colagem Dentária
/
Adesivos Dentinários
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Cimentos de Resina
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Dentina
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Sensibilidade da Dentina
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Fluoretos
Limite:
Humans
Idioma:
En
Revista:
J Dent
Ano de publicação:
2008
Tipo de documento:
Article
País de afiliação:
China