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The influence of calcium fluoride nanoparticles’ addition on the bond integrity, degree of conversion, ion-release, and dentin interaction of an adhesive

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Abstract

The study aimed to synthesize, characterize, and assess dentin bonding, ion-release, and degree of conversion (DC) of experimental adhesive (EA) with and without 5 wt% and 10 wt% calcium fluoride (CaF2) nanocrystals. The CaF2 nanocrystals were synthesized and characterized with scanning electron microscopy (SEM), line-Energy Dispersive X-Ray (EDX) spectroscopy, Fourier-transform infrared (FTIR).and micro-Raman spectroscopy techniques. Adhesives were characterized using micro-tensile bond strength test (μTBS), SEM–EDX spectroscopy, inter-facial failure investigation, adhesive-dentin interface examination, ion release measurements, FTIR, and DC analysis. One hundred five (n = 105) teeth were collected, their dentinal tissue was exposed, and the adhesives were applied pre-characterization of the adhesives. On SEM, CaF2 nanocrystals were seen as irregularly shaped agglomerates. The EDX mapping demonstrated calcium and fluoride’s presence for the CAF-5% and CAF-10% groups. The FTIR and micro-Raman spectra indicated characteristic bands for CaF2 containing materials. For the NTC samples, the highest μTBS (33.87 ± 3.26 MPa) was observed for CAF-10%. For the TC samples, the highest μTBS (30.48 ± 3.41 MPa) was observed for CAF-10%. Adhesive type failures were most common and the CaF2 containing adhesives revealed comparable resin tag formation to the controls. The presence of calcium and fluorine on EDX analysis was observed for CaF2 adhesives. For the CaF2 adhesives, an increased release of both ions was seen with a lowering pH and a lower DC was observed. Reinforcing of EA with CaF2 filler improves its mechanical properties. Further studies exploring the effect of diverse filler concentrations on different properties of the adhesive are warranted.

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Acknowledgements

The authors are grateful to the Deanship of Scientific Research, King Saud University for funding through Vice Deanship of Scientific Research Chairs, Research Chair for Biological Research in Dental Health.

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Contributions

Conceptualization, SA-S, AHA, HIT, ASA, SS and FV; methodology, SA-S, AHA, ASA, HIT, and F V; validation, M B H, F V, A H A, I F, and T A; formal analysis, S A -S, A H A, S S, and F V; investigation, S A -S, A H A, A S A, S S, and F V; data curation, S A -S, A H A, A S A, S S, M B H, and F V; writing—original draft preparation, I F, F V, H I T, M B H, and T A; writing—review and editing, S A -S, S S, A H A, I F, F V, and T A; supervision, F V, and T A funding acquisition, T A. All authors have read and agreed to the published version of the manuscript.

Corresponding author

Correspondence to Tariq Abduljabbar.

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The authors declare that they have no complete of interest.

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The research ethics review committee of Specialist dental and research center approved the study protocol with No. UDRC-07/2021. All the recommendations of the Helsinki Declaration and its later amendments were strictly followed. The teeth extracted for orthodontic treatments, which were free from any apparent defects, were gathered after attaining the patients' written informed consent and were utilized for the experiments in our study.

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Written informed consent from the patients whose extracted teeth were involved in this study was obtained.

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Informed consent was obtained for collection of teeth for testing.

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Al-Saleh, S., Tulbah, H.I., Al-Qahtani, A.S. et al. The influence of calcium fluoride nanoparticles’ addition on the bond integrity, degree of conversion, ion-release, and dentin interaction of an adhesive. Appl Nanosci 12, 3477–3488 (2022). https://doi.org/10.1007/s13204-021-02282-9

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  • DOI: https://doi.org/10.1007/s13204-021-02282-9

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