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Protocols for minimizing artifacts in estimating dental fluoride uptake from F-varnishes
Robson de Sousa Ferreira1, Jaime Aparecido Cury1, Cínthia Pereira Machado Tabchoury2
1Faculdade de Odontologia de Piracicaba, UNICAMP, Av. Limeira, 901 - Areião, Piracicaba, 13414-903, SP, Brazil.
BMC Research Notes
|May 27, 2026
Summary
Effective fluoride varnish residue removal is crucial for accurate fluoride uptake research. Protocols combining mechanical and chemical methods, especially with acetone and vortex washes, significantly minimize residual fluoride contamination.
Area of Science:
- Dental research
- Materials science
Background:
- Accurate fluoride uptake measurements in research require proper removal of fluoride varnish (FV) residue.
- Residual FV can interfere with experimental outcomes, compromising data integrity.
Purpose of the Study:
- To evaluate the efficacy of different fluoride varnish removal protocols.
- To identify the optimal method for minimizing residual fluoride contamination in research settings.
Main Methods:
- Five distinct FV removal protocols were tested on inert slabs.
- Protocols involved mechanical (scalpel, spatula) and chemical (acetone) methods with varying application times and vortex washes.
- Alkali-soluble residual contaminant fluoride (RCF) was quantified to assess removal efficiency.
Main Results:
- Protocols involving acetone and vortex washes demonstrated superior FV residue removal.
- Protocol IV (acetone swab + 30s acetone wash) and Protocol V (spatula + acetone swab + 3x10s vortexed acetone washes) achieved the lowest RCF values (0.01% and 0.03%, respectively).
- These methods were comparable to the control group in minimizing fluoride residues.
Conclusions:
- Combined mechanical and chemical approaches are most effective for FV residue removal.
- Acetone application combined with vortex agitation significantly minimizes residual fluoride varnish, ensuring reliable fluoride uptake measurements.
