Experimental Dentifrice Remineralization/Fluoride Uptake in an in Situ Model

October 17, 2016 updated by: GlaxoSmithKline

Exploratory Evaluation of an Experimental Fluoride Dentifrice Formulation Using an in Situ Remineralization/Fluoride Uptake Model

The purpose of this study is to determine whether an experimental fluoridated dentifrice is effective in the treatment of dental caries

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

Topical fluorides have been proven to be clinically effective in the prevention of dental caries. It is generally agreed that anti-caries effect of fluoride (F) is mainly by decreasing the rate of enamel demineralization and enhancing the rate of enamel remineralization. An in-situ Surface Micro-hardness (SMH) test is widely used to evaluate enamel demineralization and remineralization during the caries process. Determination of fluoride uptake in-situ also provides better estimation of true fluoride bioavailability of fluoride dentifrice products. In this study, an in-situ remineralization fluoride uptake model will be used to compare the efficacy of experimental dentifrice with a marketed dentifrice and placebo dentifrice. Participants wore partial dentures containing two partially demineralized enamel specimens for two weeks- 24 hours per day, except when brushing (twice daily) with test dentifrice. Following each treatment period, the enamel specimens were analyzed for SMH recovery and fluoride uptake through microdrill enamel biopsy technique.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
20

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years to 78 years (ADULT, OLDER_ADULT)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria:

  1. Age: Aged between 18 and 78
  2. Fluoride: Currently living in the Indianapolis area which has a fluoridated water supply (1 ppm F) and not taking fluoride supplements for medical reasons
  3. Dentures: Currently wearing a removable mandibular partial denture with sufficient room in the posterior buccal flange area to accommodate two enamel specimens (required dimensions 12 x 7 mm). Willing and capable of wearing their removable partial dentures 24 hours per day during the experimental periods
  4. Dental health:Have no current active caries or periodontal disease that may compromise the study or the health of the participants and all restorations in a good state of repair
  5. Salivary flow:Have a salivary flow rate in the range of normal values (unstimulated whole saliva flow rate ≥ 0.2 mL/min; gum base stimulated whole saliva flow rate ≥ 0.8 mL/min
  6. Compliance: Understands and is willing, able and likely to comply with all study procedures and restrictions
  7. 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
  8. General Health: Good general health with (in the opinion of the investigator) no clinically significant and/or relevant abnormalities of medical history or oral examination that could interfere with participant safety during the study period

Exclusion Criteria:

  1. Antibiotics:Currently taking antibiotics or have taken antibiotics in the two weeks prior to the screening visit
  2. Allergy/Intolerance:Known or suspected intolerance or hypersensitivity to the study materials (or closely related compounds) or any of their stated ingredients
  3. Pregnancy:Women who are known to be pregnant or who are intending to become pregnant over the duration of the study.
  4. Breast-feeding:Women who are breast-feeding.
  5. Clinical Study/Experimental Medication: Participation in another clinical study or receipt of an investigational drug within 30 days of the screening visit
  6. Personnel:An employee of the sponsor or the study site who is directly involved in the study

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: TREATMENT
  • Allocation: RANDOMIZED
  • Interventional Model: CROSSOVER
  • Masking: SINGLE

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
EXPERIMENTAL: Sodium fluoride/potassium nitrate/Isopentane dentifrice
Participants to brush their teeth for one timed minute twice daily with a gel to foam dentifrice containing active ingredients: 1450 ppm F as sodium fluoride (NaF) and 5% potassium nitrate (KNO3) and isopentane as an excipient ingredient.
Drug: NaF/ KNO3/isopentane Dentifrice
Experimental toothpaste
EXPERIMENTAL: NaF/KNO3 Dentifrice
Participants to brush their teeth for one timed minute twice daily with a gel to foam dentifrice, containing as active ingredients: 1450 ppm NaF and 5% KNO3 but no isopentane.
Drug: NaF/KNO3 Dentifrice
Experimental toothpaste
ACTIVE_COMPARATOR: NaF Dentifrice
Participants to brush their teeth for one timed minute twice daily with a dentifrice containing 1450 ppm F as NaF.
Drug: NaF Dentifrice
Active comparator
PLACEBO_COMPARATOR: Placebo Dentifrice
Participants to brush their teeth for one timed minute twice daily with a fluoride free dentifrice (0 ppm F).
Other: Placebo Dentifrice
Placebo comparator

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Percentage Surface Micro-hardness Recovery (SMHR) of Enamel Specimens
Time Frame: Baseline to 14 days
SMH test was used to assess mineralization status of enamel specimens using a 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 while decrease in the indentation length represents re-hardening of enamel surface. Percent SMHR was calculated from indentation values of enamel specimens at baseline (B), after intra-oral exposure (R) and after in-vitro demineralization (D) using formula: [(D-R)/ (D-B)]*100.
Baseline to 14 days

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Adjusted Mean Change From Baseline in Enamel Fluoride Uptake
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 and expressed as ug*F/cm^3. The difference between treatments was calculated with respect to fluoride uptake by enamel.
Baseline to 14 days

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
GlaxoSmithKline

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
September 1, 2007

Primary Completion (ACTUAL)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
January 1, 2008

Study Completion (ACTUAL)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
January 1, 2008

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
September 11, 2008

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
September 12, 2008

First Posted (ESTIMATE)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
September 15, 2008

Study Record Updates

Last Update Posted (ESTIMATE)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
December 8, 2016

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
October 17, 2016

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
May 1, 2016

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • Z3120510

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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