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Evaluation of developmentally hypomineralised enamel after surface pretreatment with Papacarie Duo gel and different etching modes: an in vitro SEM and AFM study

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Abstract

Purpose

This study aimed at investigating the surface morphology and nanotopography of normal enamel (NE) and developmentally hypomineralised enamel (HE) when subjected to various pretreatment protocols under scanning electron microscopy (SEM) and atomic force microscopy (AFM).

Methods

Sixteen NE, 16 creamy/white (CW) HE and 16 yellow/brown (YB) HE specimens sectioned from extracted hypomineralised first permanent molars (FPMs) were included in this study. They were randomly distributed into 12 experimental groups (n = 4). Each group involved the following: (1) deproteinisation with Papacarie Duo® gel or no deproteinisation, and (2) the use of Scotchbond™ Universal Adhesive (Scotchbond) in self-etch (SE) mode or 37% phosphoric acid etchant. Subsequently, the surface morphology and nanotopography of pretreated enamel specimens were evaluated under SEM and AFM, respectively.

Results

SEM observation showed that deproteinisation with Papacarie Duo® gel before phosphoric acid etching led to favourable etching patterns. This was consistent across all groups irrespective of the type of enamel specimen and the severity of hypomineralisation. In contrast, AFM results identified three factors that influenced surface parameters: (1) type of enamel specimen, (2) severity of hypomineralisation and (3) etching mode. YB HE recorded higher surface roughness values than CW HE and NE when subjected to the same pretreatment protocol. Deproteinisation and the application of Scotchbond in SE mode led to minimal topographic changes; however, acid etching was associated with an increase in surface roughness.

Conclusion

Deproteinisation with Papacarie Duo® gel followed by acid etching contributed to improved etching patterns on HE.

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Availability of data and material

The datasets generated and analysed during the study are available from the corresponding author on reasonable request.

Code availability

Not applicable.

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Acknowledgements

The authors would like to thank the participants for donating their extracted teeth and the support of the University of Otago. SEM laboratory support for this work was provided by Ms. Elizabeth Girvan from the Micro and Nanoscale Imaging (OMNI) unit.

Funding

This work was supported by the New Zealand Dental Research Foundation and International College of Dentists (grant reference: RF 8.04 2018).

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Contributions

YL conducted the research in partial fulfillment of requirements for the degree of DClinDent (Paediatric Dentistry). YL, KL and ME conceived the ideas and finalised the experimental design. YL performed the experiments, collected the data and analysed the results. KL and ME supervised the research project and helped with the analysis tools. YL took the lead in writing the manuscript. All authors provided critical feedback, discussed the results and contributed to the final manuscript.

Corresponding author

Correspondence to M. Ekambaram.

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Ethical approval

All procedures performed in the study involving the collection of extracted developmentally hypomineralised first permanent molars from human participants were in accordance with the ethical standards of the institutional Human Ethics Committee (Health) and the national Health and Disability Ethics Committee. The ethical approval reference number is H18/086.

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Written informed assent was obtained from all participating children, and additional written informed consent was obtained from their legal guardians.

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Lee, YL., Li, K.C., Yiu, C.K.Y. et al. Evaluation of developmentally hypomineralised enamel after surface pretreatment with Papacarie Duo gel and different etching modes: an in vitro SEM and AFM study. Eur Arch Paediatr Dent 23, 117–131 (2022). https://doi.org/10.1007/s40368-021-00671-w

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