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The effect of different liners on the bond strength of a compomer to primary teeth dentine: in vitro study

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Abstract

Objective

This in vitro investigation should identify the effect of protective liners on dentine bond strength of a polyacid modified resin composite to dentine of primary teeth.

Methods

Forty-two extracted caries-free primary molars were randomly assigned to seven groups (n = 6) and flattened. Six test groups were centrally covered with different protective liners/base materials: Kerr Life (KL), IRM zinc oxide eugenol cement (IRM), Ketac Bond (KB), Vitrebond (VB), Dycal (DY), and mineral trioxide aggregate (MTA). Specimens were bonded with Prime&Bond NT (PB) and restored with Dyract eXtra. The control group (C) did not receive liner pretreatment. After 24-h storage in Aqua dest. (37 °C), specimens were cut and regional microtensile bond strengths of the uncovered areas were tested. Fractography was conducted under a light microscope and further interface/surface analyses were performed under a SEM. Statistical appraisal was carried out using oneway ANOVA (mod. LSD test; p < 0.05).

Results

Independent of the distance to the applied liner, all groups exhibited inferior μ-TBS to dentine of primary teeth compared to the control group (p < 0.05). The results were as follows in MPa(SD) x:significance level/percentage of adhesive fractures: PB: 34 (10)A/72%; KL: 23 (25)B/64%; KB: 15 (12)C/76%; DY 15 (13)C/55%; IRM: 14 (10)C/68%; VB: 12 (10)C/61%; MTA 12 (10)C/69%.

Conclusions

Protective liners significantly reduced μ-TBS to dentine of primary teeth.

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Acknowledgements

The authors would like to thank Ms. Ingrid Heidmann for the fluorescence microscope and SEM imaging and Mr. Johannes Herrmann for the statistical analysis.

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Authors and Affiliations

Authors

Contributions

RF wrote the manuscript and conceived the ideas, SN made the experiments, SL supervised the experiments and performed microscopic evaluations, NL and NK analyzed the data and proofread the paper.

Corresponding author

Correspondence to N. Krämer.

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Conflict of interest

RF has received research Grants from following companies: Dentsply, 3M, Ivoclar, GC, Kulzer. NK has received research grants from 3M, Pulpdent, GC, Dentsply. RF has received a speaker honorarium from Dentsply, Ivoclar, 3M, Kulzer, and ADS. NK has received speaker honorarium from Dentsply, Kulzer, GC, 3M, and ADS. SN and SL do not have any conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study was approved with AZ 190/14 by the Ethics committee of the Justus-Liebig-University Giessen, Germany.

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Informed consent was obtained from all individual participants included in the study.

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Frankenberger, R., Nassiri, S., Lücker, S. et al. The effect of different liners on the bond strength of a compomer to primary teeth dentine: in vitro study. Eur Arch Paediatr Dent 22, 643–649 (2021). https://doi.org/10.1007/s40368-020-00601-2

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  • DOI: https://doi.org/10.1007/s40368-020-00601-2

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