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In Situ Caries Efficacy of Fluoride Toothpastes

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ClinicalTrials.gov Identifier: NCT00708097
Recruitment Status : Completed
First Posted : July 2, 2008
Results First Posted : June 24, 2013
Last Update Posted : January 1, 2015
Sponsor:
Information provided by (Responsible Party):
GlaxoSmithKline

Study Description
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Brief Summary:
This study is to evaluate the effect of fluoride dentifrices on enamel with artificial caries lesions in an in situ model

Condition or disease Intervention/treatment Phase
Caries Drug: NaF Drug: Placebo Drug: NaMFP Phase 3

Detailed Description:
In situ models represent an acceptable approach for testing the anti-caries potential of fluoride products. This study is to evaluate the effect of fluoride dentifrice containing 1450 parts per million fluoride (ppm F) on enamel with artificial caries lesions in an in situ model. The study toothpaste containing sodium fluoride (NaF) and 0.4% carbopol will be compared to 4 other dentifrices. Comparator toothpastes include NaF toothpaste (1400 ppm F), NaF toothpaste (675 ppm F), sodium monofluorophosphate (NaMFP) and NaF toothpaste (1450 ppm F) and placebo toothpaste (0 ppm F).
Study Design
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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 57 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Single (Investigator)
Primary Purpose: Treatment
Official Title: Clinical Efficacy of Fluoride Toothpastes Using an in Situ Caries Model
Study Start Date : April 2008
Actual Primary Completion Date : July 2008
Actual Study Completion Date : July 2008

Resource links provided by the National Library of Medicine


Arms and Interventions
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Arm Intervention/treatment
Experimental: NaF toothpaste(1450 ppmF)
Study toothpaste containing 1450 ppm F as NaF and 0.4% carbopol as excipient.
 Drug: NaF
Fluoride
Other Name: Fluoride
Active Comparator: NaF toothpaste (1400 ppmF)
Study toothpaste containing 1400 ppm F as NaF
 Drug: NaF
Fluoride
Other Name: Fluoride
Active Comparator: NaMFP/NaF toothpaste (1450 ppmF)
Reference toothpaste containing 1000 ppm F as NaMFP and 450 ppm F as NaF
 Drug: NaF
Fluoride
Other Name: Fluoride

Drug: NaMFP
Fluoride
Active Comparator: NaF toothpaste (675 ppmF)
Study toothpaste containing 675 ppm F as NaF
 Drug: NaF
Fluoride
Other Name: Fluoride
Placebo Comparator: Placebo toothpaste (0 ppmF)
Fluoride free placebo toothpaste (0 ppm F)
 Drug: Placebo
Placebo


Outcome Measures
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Primary Outcome Measures :
  1. Percentage Surface Microhardness Recovery (%SMHR) of Sound Enamel Specimens Exposed to NaF Toothpaste (1450ppmF) and NaF Toothpaste (1400ppmF) [ Time Frame: Baseline to 14 days ]
    SMH test was used to assess mineral status of partially demineralized enamel specimens using Wilson 2100 Hardness tester. SMH was determined by measuring the length of the indentations of enamel specimens. An increase in the indentation length compared to the baseline indicates softening/demineralization while decrease in the indentation represents rehardening/ remineralization of enamel surface. Percent SMHR was calculated from indentation values of enamel specimens at baseline(B); after intra-oral exposure(R) on Day 14; and after in-vitro demineralization(D) on Day 14 using formula [(D-R)/(D-B)]*100.


Secondary Outcome Measures :
  1. Percentage SMHR of Sound Enamel Specimens Exposed to NaF Toothpaste (1450ppmF), NaF Toothpaste (1400ppmF), NaMFP/NaF Toothpaste (1450ppmF), NaF Toothpaste (675ppmF) and Placebo Toothpaste (0ppmF) [ Time Frame: Baseline to 14 days ]
    SMH test was used to assess mineral status of partially demineralized enamel specimens using Wilson 2100 Hardness tester. SMH was determined by measuring the length of the indentations of enamel specimens. An increase in the indentation length compared to the baseline indicates softening/demineralization while decrease in the indentation represents rehardening/ remineralization of enamel surface. Percent SMHR was calculated from indentation values of enamel specimens at baseline(B); after intra-oral exposure(R) on Day 14; and after in-vitro demineralization(D) on Day 14 using formula [(D-R)/(D-B)]*100.

  2. Percentage SMHR of Demineralized Enamel Specimens Exposed to NaF Toothpaste (1450ppmF), NaF Toothpaste (1400ppmF), NaF Toothpaste (675ppmF), NaMFP/NaF Toothpaste(1450ppmF) and Placebo Toothpaste (0ppmF) [ Time Frame: Baseline to 14 days ]
    SMH test was used to assess mineral status of partially demineralized enamel specimens using Wilson 2100 Hardness tester. SMH was determined by measuring the length of the indentations of enamel specimens. An increase in the indentation length compared to the baseline indicates softening/demineralization while decrease in the indentation represents rehardening/ remineralization of enamel surface. Percent SMHR was calculated from indentation values of enamel specimens at baseline(B); after intra-oral exposure(R) on Day 14; and after in-vitro demineralization(D) on Day 14 using formula [(D-R)/(D-B)]*100.

  3. Enamel Fluoride Uptake (Sound Enamel Specimens) [ Time Frame: Baseline to 14 days ]
    Enamel fluoride uptake was determined using the microdrill enamel biopsy technique. The amount of fluoride uptake by enamel was calculated based on the amount of fluoride (F) divided by the area of the enamel cores. The difference between treatments was calculated with respect to fluoride uptake by enamel.

  4. Enamel Fluoride Uptake (Demineralized Specimens) [ Time Frame: Baseline to 14 days ]
    Enamel fluoride uptake was determined using the microdrill enamel biopsy technique. The amount of fluoride uptake by enamel was calculated based on the amount of fluoride (F) divided by the area of the enamel cores. The difference between treatments was calculated with respect to fluoride uptake by enamel.


Eligibility Criteria
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Ages Eligible for Study:   18 Years to 78 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

  • Consent:Demonstrates understanding of the study and willingness to participate as evidenced by voluntary written informed consent and has received a signed and dated copy of the informed consent form.
  • Age:Aged between 18 and 80 years.
  • Compliance:Understands and is willing, able and likely to comply with all study procedures and restrictions.
  • General Health:Good general health with (in the opinion of the investigator) no clinically significant and relevant abnormalities of medical history or physical examination.
  • Fluoride:Currently living in the Indianapolis, Indiana area and not taking fluoride supplements for medical reasons
  • Dentures: a)Currently wearing a removable mandibular partial denture with sufficient room in both posterior buccal flange areas to accommodate two enamel specimens on each side, four specimens in total - required dimensions 12 x 7 millimeter (mm) per side. b) Willing to have their denture modified to accommodate enamel test specimens and willing and capable of wearing their removable mandibular partial dentures 24 hours per day during the experimental periods
  • Dental health: Have no current active caries or periodontal disease that may compromise the study or the health of the subjects and all restorations in a good state of repair
  • Salivary flow:Have a salivary flow rate in the range of normal values (unstimulated whole saliva flow rate = 0.2 milliliter (mL)/minute; gum base stimulated whole saliva flow rate = 0.8 mL/minute)

Exclusion Criteria:

  • Pregnancy: Women who are known to be pregnant or who are intending to become pregnant over the duration of the study.
  • Breast-feeding:Women who are breast-feeding.
  • Allergy/Intolerance: Known or suspected intolerance or hypersensitivity to the study materials (or closely related compounds) or any of their stated ingredients.
  • Antibiotics: Currently taking antibiotics or have taken antibiotics in the two weeks prior to the screening visit
  • Clinical Study/Experimental Medication: a) Participation in another clinical study or receipt of an investigational drug within 30 days of the screening visit.b) Participation in another GSKCH investigational dental product study within 7 days of first study treatment c)Previous participation in this study.
  • Substance abuse: Recent history (within the last year) of alcohol or other substance abuse.
  • Personnel:a) A member of the site study staff living in same household.b)An employee of the sponsor. c) Any employee of any toothpaste manufacturer or their spouse or family member
Contacts and Locations
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Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00708097


Locations
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United States, Indiana
Indiana University School of Dentistry
Indianapolis, Indiana, United States, 46202
Sponsors and Collaborators
GlaxoSmithKline
Investigators
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Study Director: GSK Clinical Trials GlaxoSmithKline
More Information
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Responsible Party: GlaxoSmithKline
ClinicalTrials.gov Identifier: NCT00708097    
Other Study ID Numbers: T3508565
First Posted: July 2, 2008    Key Record Dates
Results First Posted: June 24, 2013
Last Update Posted: January 1, 2015
Last Verified: December 2014
Keywords provided by GlaxoSmithKline:
fluoride
in situ
remineralization
enamel
caries
Additional relevant MeSH terms:
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Fluorides
Cariostatic Agents
Protective Agents
Physiological Effects of Drugs