A1 Refereed original research article in a scientific journal
Microtensile bond strength to phosphoric acid-etched dentin treated with NaF, KF and CaF2
Authors: Altinci P, Mutluay M, Tjaderhane L, Tezvergil-Mutluay A
Publisher: ELSEVIER SCI LTD
Publication year: 2018
Journal: International Journal of Adhesion and Adhesives
Journal name in source: INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
Journal acronym: INT J ADHES ADHES
Volume: 85
First page : 337
Last page: 343
Number of pages: 7
ISSN: 0143-7496
eISSN: 1879-0127
DOI: https://doi.org/10.1016/j.ijadhadh.2018.06.016
Abstract
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.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.Results: Fluoride compound, fluoride concentration and storage time showed significant effect on TBS (p < 0.05). NaF, KF and Excite F groups showed higher TBS than the control (p < 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 < 0.05), and the bond strength of 6 and 24 mM F groups were also found higher than the control (p < 0.05). After 12 months, all F groups showed stable bond strength (p > 0.05), except CaF2 179 mM (p < 0.05). According to Chi-square test, fracture types were also significantly influenced from the test factors (p < 0.05).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.
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.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.Results: Fluoride compound, fluoride concentration and storage time showed significant effect on TBS (p < 0.05). NaF, KF and Excite F groups showed higher TBS than the control (p < 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 < 0.05), and the bond strength of 6 and 24 mM F groups were also found higher than the control (p < 0.05). After 12 months, all F groups showed stable bond strength (p > 0.05), except CaF2 179 mM (p < 0.05). According to Chi-square test, fracture types were also significantly influenced from the test factors (p < 0.05).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.
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