Bonding Durability of a Self-etch Adhesive to Normal Versus Smear-layer Deproteinized Dentin: Effect of a Reducing Agent and Plant-extract Antioxidant.
J Adhes Dent
; 19(3): 253-258, 2017.
Article
em En
| MEDLINE
| ID: mdl-28580461
ABSTRACT
PURPOSE:
To evaluate the effect of a reducing agent and plant-extract antioxidant on the bonding durability of a self-etch adhesive to normal and NaOCl-treated, smear-layer-deproteinized dentin. MATERIALS ANDMETHODS:
Flat smear-layer-covered dentin surfaces from 60 extracted human molars were prepared by removing the occlusal enamel. The teeth were divided into two groups with or without NaOCl-deproteinizing treatment for 30â¯s, and further divided into three subgroups as follows no application of antioxidant, application of Accel (p-toluenesulfinic acid sodium salt solution) for 5â¯s, or application of rosmarinic acid solution for 5â¯s. All treated dentin surfaces were bonded with a two-step self-etch adhesive (Clearfil SE Bond) and restored with composite (Clearfil AP-X). The bonded teeth were sectioned into a hourglass-shaped sticks with a composite-dentin bonded interface area of 1.0â¯mm2. After storage in artificial saliva for 24â¯h or 1â¯year, the specimens were subjected to the microtensile bond strength test (nâ¯=â¯15). Data were statistically analyzed with three-way ANOVA, Tukey's post-hoc test, and the t-test (pâ¯<â¯0.05).RESULTS:
Without an antioxidant, 1-year storage significantly reduced the bond strengths of the self-etch adhesive to normal and smear-layer-deproteinized dentin compared with those after 24-h storage (pâ¯<â¯0.05). Application of Accel and rosmarinic acid restored the compromised initial bond strengths to smear-layer-deproteinized dentin (pâ¯<â¯0.05), and prevented long-term deterioration of bond strengths to both normal and smear-layer-deproteinized dentin (pâ¯>â¯0.05).CONCLUSION:
Application of Accel and rosmarinic acid improved bonding durability of the self-etch adhesive to both normal and smear-layer-deproteinized dentin.
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Adesivos Dentinários
/
Substâncias Redutoras
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article