Systemic Fluoride Bioavailability From Toothpastes Containing Calcium Carbonate or Silica as Abrasives

NCT ID: NCT01571050

Last Updated: 2012-04-04

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

PHASE1

Total Enrollment

20 participants

Study Classification

INTERVENTIONAL

Study Start Date

2011-01-31

Study Completion Date

2011-12-31

Brief Summary

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The risk of dental fluorosis development is related to the systemic exposure to fluoride during enamel formation. Currently, diet and fluoride toothpastes are the main sources of fluoride to children at the age-risk for fluorosis development. However, when estimating the risk of fluorosis from toothpaste inadvertently ingested, it has not been considered the systemic fluoride bioavailability. Since some toothpaste formulations may contain part of fluoride as insoluble salts, the hypothesis behind this study is that only soluble fluoride in toothpastes would be absorbed when they are inadvertently ingested. To test that, adult volunteers will ingest a standardized dose of total fluoride from commercially available toothpastes, which present different concentrations of soluble fluoride. Fluoride systemic bioavailability will be assessed by the release of fluoride in saliva up to 3 hours after ingestion (as an indicator of blood fluoride) and by urinary fluoride excretion.

Detailed Description

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Conditions

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Dental Fluorosis

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

Primary Study Purpose

PREVENTION

Blinding Strategy

SINGLE

Investigators

Study Groups

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Fresh NaF/SiO2 toothpaste

Group Type EXPERIMENTAL

Fresh NaF/SiO2 toothpaste

Intervention Type DRUG

Ingestion of 49.5 mg of a fresh toothpaste containing 1100 ppm total fluoride per kg body weight, diluted in 30 mL of purified water, to provide a total intake of 49.5 ug of fluoride/kg body weight.

Purified water

Group Type PLACEBO_COMPARATOR

Purified water

Intervention Type DRUG

Ingestion of 30 mL of purified water

Aged NaF/SiO2 toothpaste

Group Type EXPERIMENTAL

Aged NaF/SiO2 toothpaste

Intervention Type DRUG

Ingestion of 49.5 mg of a toothpaste containing 1100 ppm total fluoride per kg body weight, diluted in 30 mL of purified water, to provide a total intake of 49.5 ug of fluoride/kg body weight. The toothpaste had been previously aged to simulate one year storage at room temperature.

Fresh MFP/CaCO3 toothpaste

Group Type EXPERIMENTAL

Fresh MFP/CaCO3 toothpaste

Intervention Type DRUG

Ingestion of 31.9 mg of a fresh toothpaste containing 1450 ppm total fluoride per kg body weight, diluted in 30 mL of purified water, to provide a total intake of 49.5 ug of fluoride/kg body weight.

Aged MFP/CaCO3 toothpaste

Group Type EXPERIMENTAL

Aged MFP/CaCO3 toothpaste

Intervention Type DRUG

Ingestion of 31.9 mg of a toothpaste containing 1450 ppm total fluoride per kg body weight, diluted in 30 mL of purified water, to provide a total intake of 49.5 ug of fluoride/kg body weight. The toothpaste had been previously aged to simulate one year storage at room temperature.

Interventions

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Purified water

Ingestion of 30 mL of purified water

Intervention Type DRUG

Fresh MFP/CaCO3 toothpaste

Ingestion of 31.9 mg of a fresh toothpaste containing 1450 ppm total fluoride per kg body weight, diluted in 30 mL of purified water, to provide a total intake of 49.5 ug of fluoride/kg body weight.

Intervention Type DRUG

Fresh NaF/SiO2 toothpaste

Ingestion of 49.5 mg of a fresh toothpaste containing 1100 ppm total fluoride per kg body weight, diluted in 30 mL of purified water, to provide a total intake of 49.5 ug of fluoride/kg body weight.

Intervention Type DRUG

Aged NaF/SiO2 toothpaste

Ingestion of 49.5 mg of a toothpaste containing 1100 ppm total fluoride per kg body weight, diluted in 30 mL of purified water, to provide a total intake of 49.5 ug of fluoride/kg body weight. The toothpaste had been previously aged to simulate one year storage at room temperature.

Intervention Type DRUG

Aged MFP/CaCO3 toothpaste

Ingestion of 31.9 mg of a toothpaste containing 1450 ppm total fluoride per kg body weight, diluted in 30 mL of purified water, to provide a total intake of 49.5 ug of fluoride/kg body weight. The toothpaste had been previously aged to simulate one year storage at room temperature.

Intervention Type DRUG

Eligibility Criteria

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Inclusion Criteria

* Good general health
* Good oral health
* Normal salivary flow rate

Exclusion Criteria

* Gastric disorders
* Renal disorders
Minimum Eligible Age

19 Years

Maximum Eligible Age

40 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes

Sponsors

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University of Campinas, Brazil

OTHER

Sponsor Role lead

Responsible Party

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Livia Maria Andaló Tenuta

Assistant Professor, Biochemistry and Cariology

Responsibility Role PRINCIPAL_INVESTIGATOR

Principal Investigators

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Livia MA Tenuta, PhD

Role: PRINCIPAL_INVESTIGATOR

Piracicaba Dental School, University of Campinas

Locations

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Piracicaba Dental School, University of Campinas

Piracicaba, São Paulo, Brazil

Site Status

Countries

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Brazil

References

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Cury JA, Del Fiol FS, Tenuta LM, Rosalen PL. Low-fluoride dentifrice and gastrointestinal fluoride absorption after meals. J Dent Res. 2005 Dec;84(12):1133-7. doi: 10.1177/154405910508401208.

Reference Type BACKGROUND
PMID: 16304442 (View on PubMed)

Cury JA, Oliveira MJ, Martins CC, Tenuta LM, Paiva SM. Available fluoride in toothpastes used by Brazilian children. Braz Dent J. 2010;21(5):396-400. doi: 10.1590/s0103-64402010000500003.

Reference Type BACKGROUND
PMID: 21180793 (View on PubMed)

Martins CC, Oliveira MJ, Pordeus IA, Cury JA, Paiva SM. Association between socioeconomic factors and the choice of dentifrice and fluoride intake by children. Int J Environ Res Public Health. 2011 Nov;8(11):4284-99. doi: 10.3390/ijerph8114284. Epub 2011 Nov 10.

Reference Type BACKGROUND
PMID: 22163207 (View on PubMed)

Falcao A, Tenuta LM, Cury JA. Fluoride gastrointestinal absorption from Na2FPO3/CaCO3- and NaF/SiO2-based toothpastes. Caries Res. 2013;47(3):226-33. doi: 10.1159/000346006. Epub 2012 Dec 29.

Reference Type DERIVED
PMID: 23295625 (View on PubMed)

Other Identifiers

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FOPFBioavailability2011

Identifier Type: -

Identifier Source: org_study_id

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