Clinical trial NCT05442320: Nails and Teeth as Biomarkers of Fluoride Exposure
Official title: Influence of Different Toothpaste on Fluoride Concentration in Nails and Dental Fluorosis
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Fluorosis, Dental
Keywords: Dental fluorosis
Fingernails fluoride concentration
Fluoride toothpaste concentration
Lead sponsor: University of Ljubljana
Sponsor class: OTHER
First posted: 2022-07-05
Enrollment: 342
Sex: ALL
Minimum age (years): 0
Maximum age (years): 14
Standard ages: CHILD
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Intervention model description: Two parallel groups with different toothpaste fluoride concentrations (500 ppm, 1000 ppm)
Primary purpose: PREVENTION

Brief summary: To determine fluoride concentration in fingernails and estimate if there is a correlation between fluoride concentration in fingernails and fluoride concentration in toothpaste used. In addition, fluorosis of permanent incisors will be evaluated at 13 years of age and correlated with toothpaste fluoride concentration.

Detailed description: Toothpaste with 1000 ppm fluoride and above are more effective in a caries prevention in comparison to toothpastes with lower fluoride concentration or to placebo. Higher fluoride concentrations in toothpastes increase risk for development of tooth fluorosis. Children in first three years of life are most susceptible due to formation of permanent incisors and first molars in this period, beside younger children ingest more toothpaste compared to older children. Fluoride exposure can be measured in nails, where the average plasma fluoride concentration is reflected. The aim of our study was to determine fluoride concentration in fingernails and estimate if there is a correlation between fluoride concentration in fingernails and fluoride concentration in toothpaste used. In our study were included parents and children who had participated in previous studies from parenting class until children's 3 years of age. At that time children were randomly assigned to one of two groups, of which one was being given a toothpaste with 500 ppm fluoride and the other with 1000 ppm fluoride. Children were examined regularly until the age of 3. Children were invited to participate in another clinical examination at 4 years of age. At the time of examination parents were asked to fulfil a questionnaire about oral hygiene habits and a sample of children's fingernails were taken. A questionnaire fulfilled 200 parents, 169 children were examined, finger nail fluoride was analysed by using a gas chromatography method in 161 children. We determined that in 76 % the toothpaste chosen was not appropriate according to EAPD guidelines, 66 % parents was using toothpaste with 500 ppm fluoride for their children. The mean fingernail concentration was 1,43 ng/mg (SD = 0,08). The difference between groups using toothpastes with different fluoride concentrations, and compared with other factors, was not statistically significant. The mean concentration of fluoride in nails of our test group was low compared to reported values in similar studies and there was no significant difference between groups regarding to toothpaste used.

In addition, fluorosis of permanent incisors will be evaluated at 13 years of age and correlated with toothpaste fluoride concentration.

Eligibility criteria: Inclusion Criteria:

* participation in parenting class
* normal pregnancy

Exclusion Criteria:

* chronic systemic diseases
* genetic conditions
* complications at delivery

Primary outcomes:
measure: Dental fluorosis
timeFrame: 6 years after permanent incisor eruption
Secondary outcomes:
measure: Fingernails fluoride concentration
timeFrame: 4 years of age
Other outcomes:
measure: Caries in primary dentition
timeFrame: 4 years of age
Locations:
Study officials:
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