University of Oulu

Pinar Altinci, Murat Mutluay, Leo Tjäderhane, Arzu Tezvergil-Mutluay, Microtensile bond strength to phosphoric acid-etched dentin treated with NaF, KF and CaF2, International Journal of Adhesion and Adhesives, Volume 85, 2018, Pages 337-343, ISSN 0143-7496,

Microtensile bond strength to phosphoric acid-etched dentin treated with NaF, KF and CaF₂

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Author: Altinci, Pinar1,2; Mutluay, Murat2,3; Tjäderhane, Leo4,5;
Organizations: 1Finnish Doctoral Program in Oral Sciences, Turku, Finland
2Department of Restorative Dentistry and Cariology, Institute of Dentistry, University of Turku, Turku, Finland
3Institute of Dentistry, University of Eastern Finland, Kuopio, Finland
4Department of Oral and Maxillofacial Diseases, University of Helsinki, and Helsinki University Hospital, Helsinki, Finland
5Research Unit of Oral Health Sciences and Medical Research Center Oulu (MRC Oulu), Oulu University Hospital and University of Oulu, Oulu, Finland
6Turku University Hospital, TYKS, University of Turku, Turku, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.3 MB)
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Language: English
Published: Elsevier, 2018
Publish Date: 2020-06-18


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 (µTBS) 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 µTBS test beams, stored in artificial saliva at 37 °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 (α = 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 µTBS (p < 0.05). NaF, KF and Excite F groups showed higher µTBS than the control (p < 0.05). After 24 h, µTBS 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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Series: International journal of adhesion and adhesives
ISSN: 0143-7496
ISSN-E: 1879-0127
ISSN-L: 0143-7496
Volume: 85
Pages: 337 - 343
DOI: 10.1016/j.ijadhadh.2018.06.016
Type of Publication: A1 Journal article – refereed
Field of Science: 313 Dentistry
Funding: This study was funded by the grant #8126472 from the Academy of Finland to AT-M (PI) and EVO funding #13140 of Turku University Hospital to AT-M (PI).
Copyright information: © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license