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Improving bonding to eroded dentin by using collagen cross-linking agents: 2 years of water storage

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Abstract

Objectives

The aim of this study was to investigate the effects of collagen cross-linking agents on nanomechanical and bonding properties of eroded dentin (ED), 24 h and 2 years after water storage.

Materials and methods

Human molar dentin surfaces, eroded by soft drinks or citric acid, were acid-etched and treated with primers containing proanthocyanidin (PA) and riboflavin (RI) or were untreated (control) and tested after 24 h and 2 years. After acid etching and adhesive application (Prime&Bond Elect (PBE); Scotchbond Universal (SBU); Tetric n-bond Universal (TEU)), specimens were sectioned into beams and tested for microtensile bond strength (μTBS) and silver nitrate deposition (NL) after 24 h and 2 years. The beams were used to evaluate the 24-h in situ conversion of degree (DC). Nanohardness (NH) and Young’s modulus (YM) were evaluated via resin-bonded dentin slices after 24 h and 2 years. A three-way ANOVA and Tukey’s test were used for statistical analysis (5%).

Results

For both storage times, ED with citric acid resulted in lower μTBS, NH, and YM and higher NL for each adhesive system than soft drink ED (p < 0.05). After 2 years of water storage, cross-linking primers maintained the μTBS, NH, and YM (p < 0.05) when compared with the control group. Althougth, the NL values decreased for all groups after 2 years of water storage, PA and RI treatments showed NI values lower than control group (p < 0.001). No significant differences were observed between PA and RI treatments (p > 0.05). Cross-linking primers maintain or improve DC (p < 0.03). In general, TEU and SBU yielded higher μTBS, DC, NH, and YM and lower NL than PBE.

Conclusion

Cross-linking agents improved the results and maintained the resin-ED interface bonding and nanomechanical properties, without jeopardizing adhesive polymerization.

Clinical relevance

Cross-linking agents are a viable alternative for improving and maintaining resin-ED interface bonding and nanomechanical properties.

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Acknowledgements

This study was performed by Fabiana Siqueira as partial fulfillment of his PhD degree at the State University of Ponta Grossa (UEPG), Ponta Grossa, PR, Brazil. This study was partially supported by the National Council for Scientific and Technological Development (CNPq) under grants 303332/2017-4 and 304105/2013-9 and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001. Also, authors  are grateful for the support provided by Cental de Laboratórios Multiusuários/Universidade Estadual de Ponta Grossa (CLABMU/UEPG).

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de Siqueira, F.S.F., Hilgemberg, B., Araujo, L.C.R. et al. Improving bonding to eroded dentin by using collagen cross-linking agents: 2 years of water storage. Clin Oral Invest 24, 809–822 (2020). https://doi.org/10.1007/s00784-019-02918-9

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