• Altinci, Pinar
• Tezvergil-Mutluay, Arzu
• Tjäderhane, Leo
• Mutluay, Murat

Abstract

<p>Purpose: Fluoride compounds have been reported to play a protective role in the host-derived enzymatic degradation of demineralized dentin matrices. The objective of this study was to evaluate the effect of fluoride pretreatment on the immediate and long-term microtensile bond strength (mu TBS) of resin-dentin interfaces.</p><p>Materials and methods: Mid-coronal dentin surfaces of ninety-nine teeth were etched with 32%wt phosphoric acid and randomly assigned to pretreatment with NaF, KF or CaF2 solutions (6, 24 and 179 mM F content) for 30 s before the application of bonding agent (Scothbond Multi-Purpose, 3 M ESPE). No fluoride pretreatment and a commercially available bonding agent with KF (Excite F, Ivoclar Vivadent) were used as controls. After composite built-up, the specimens were sectioned into TBS test beams, stored in artificial saliva at 37 degrees C for 24 h, 6 or 12 months and tested. Fracture types were evaluated under scanning electron microscope. The data were analyzed with ANOVA and Scheffe post-hoc tests (alpha = 0.05). Pearson Chi-Square test was used to compare the distribution of failure types.</p><p>Results: Fluoride compound, fluoride concentration and storage time showed significant effect on TBS (p &lt;0.05). NaF, KF and Excite F groups showed higher TBS than the control (p &lt;0.05). After 24 h, TBS ranged between 35.26 (+/- 10.25) MPa in control to 54.65(+/- 14.60) MPa in NaF 24 mM group (p &lt;0.05), and the bond strength of 6 and 24 mM F groups were also found higher than the control (p &lt;0.05). After 12 months, all F groups showed stable bond strength (p &gt; 0.05), except CaF2 179 mM (p &lt;0.05). According to Chi-square test, fracture types were also significantly influenced from the test factors (p &lt;0.05).</p><p>Conclusions: NaF and KF treatment after acid-etching step of adhesive bonding procedures do not adversely influence the initial or long-term bond strength to dentin, and can improve the maintenance of bond strength durability.</p>

Topics

• surface
• compound
• strength
• composite
• etching
• durability
• resin