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Fluoride uptake in dentin with and without simulating dentinal fluid flow

T Attin¹, H G Schaller, E Hellwig

¹University Clinic of Dentistry (Zahnklinik), Department of Operative Dentistry, Freiburg, Germany.

Clinical Oral Investigations

|June 5, 1998

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Simulating dentinal fluid flow did not affect total fluoride uptake but reduced structurally bound fluoride from dentifrice slurry. High-concentration fluoride solutions showed no difference in bound fluoride with or without fluid flow.

Area of Science:

Dental science
Biomaterials science

Background:

Dentin's porous structure can influence fluoride interaction.
Understanding fluoride uptake is crucial for caries prevention strategies.

Purpose of the Study:

To compare fluoride uptake in dentin under simulated dentinal fluid flow conditions.
To evaluate the impact of fluid flow on different forms of fluoride uptake.

Main Methods:

Prepared human dentinal discs and divided into groups for treatment with low-concentration dentifrice slurry or high-concentration fluoride solution.
Utilized a two-chamber device to simulate dentinal fluid flow for 24 hours.
Assayed specimens for KOH-soluble fluoride and structurally bound fluoride in successive layers.

Main Results:

Related Experiment Videos

Higher KOH-soluble fluoride uptake was observed with high-concentration fluoride solution compared to dentifrice slurry.
Dentinal fluid flow did not influence KOH-soluble fluoride uptake.
Structurally bound fluoride acquisition was reduced by fluid flow when using dentifrice slurry, but not with high-concentration fluoride solution.

Conclusions:

Simulated dentinal fluid flow impacts fluoride interaction with dentin, particularly affecting bound fluoride from lower concentration sources.
The model simulating outward dentinal fluid flow is recommended for future fluoride uptake studies in dentin.