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Completed

NCT Number: NCT03587428

Effect of Two Toothpastes on Bacteria in Saliva

This study investigated the ability of two zinc-containing toothpaste formulations (Zinc A and Zinc B) to reduce the level of bacteria in saliva in the two-hour period after their use, compared to the effect of rinsing with water alone.

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Key information

Conditions

Oral Health

Age range

18 year–85 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

GSK Investigational Site

Weybridge, KT13 0DE, United Kingdom

About this study

This was a single centre, three treatment, randomized, blinded, cross-over study which involved rinsing with slurries of two sodium fluoride-silica dentifrices containing zinc chloride and sodium citrate, and with water alone. The study consisted of four Visits: Visit 1 (Screening), Visit 2 (Treatment 1), Visit 3 (Treatment 2), Visit 4 (Treatment 3). There was a minimum two days wash out period before the first treatment visit and between treatment visits to avoid any treatment carry-over effect. During that time participants brushed as normal (twice-daily) at home with a washout toothpaste and a toothbrush which was provided at screening. Participants were required not to brush their teeth on the morning of the treatment visits and not to eat or drink for 2 hours prior to the treatment visits.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Personnel: GSKCH permanent and contract/contingency workers.
  • Consent: Demonstrated understanding of the study and was willing to participate and had received a signed and dated copy of the informed consent form.
  • Compliance: Understood, was willing and able and complied with all study procedures and restrictions.
  • General Health: Good general health
  • Oral Health: Good oral health
  • Salivary Flow Rate: Had a salivary flow rate in the range of normal values (unstimulated whole saliva flow rate ≥ 0.2milliliter per minute (ml/min); stimulated whole saliva flow rate ≥ 0.8ml/min)

Exclusion criteria

  • Study personnel: Members of the clinical study staff.
  • Pregnancy: Pregnant Women
  • Breast-feeding: Women who were breast-feeding.
  • Allergy/Intolerance: Had Known or suspected intolerance or hypersensitivity to the study materials (or closely related compounds) or any of their stated ingredients.
  • Medication: a) Used an antimicrobial mouthwash within 48 hours of the test visit e.g. Listerine, Corsodyl etc. b) had taken, antibiotics within 2 weeks of the test visit.
  • Oral Surgery and Dental Conditions: a)Had an on-going dental treatment b) Had any oral surgery or extraction within 6 weeks of screening c) Symptoms of oral pain or any self-reported oral ulcers or herpetic lesions
  • Clinical Study Participation: a) Participation in a clinical study where they received an investigational drug within 2 weeks of the screening visit b) Previously participated in this study.
  • Substance Abstinence: Participant who were unwilling to abstain from smoking for at least 2 hours prior to treatment visits.

Treatment and study plan

Zinc-A toothpaste

Drug

Participants received 6.0 grams (g) [± 0.3g] of the Zinc-A toothpaste in the form of slurry, one day per treatment (with at least 2 [generally 7] days between treatments. Participants emptied the contents of the dosing cup into their mouth, swilled the product around their mouth for 2 timed minutes then they expectorated into a sink.

Zinc-B toothpaste

Drug

Participants received 6.0 grams (g) [± 0.3g] of the Zinc-B toothpaste in the form of slurry, one day per treatment (with at least 2 [generally 7] days between treatments. Participants emptied the contents of the dosing cup into their mouth, swilled the product around their mouth for 2 timed minutes then they expectorated into a sink.

Mineral Water

Other

Participants received 6.0g (±0.3g) of mineral water (by weighing out), one day per treatment (with at least 2 [generally 7] days between treatments). Participants emptied the contents of the dosing cup into their mouth, swilled the product around their mouth for 2 timed minutes then they expectorated into a sink.

Primary outcomes

  1. Change From Baseline in Area Under the Curve Between 0 and 2 Hours (AUC [0-2] Hours) for Total Viable Counts (TVCs) of Bacteria in Saliva Using Traditional Plating Technique

    Time frame: Change from baseline in log10-transformed AUC 0-2hr

    Area Under the Curve (AUC) between 0 and 2 hours (hr) was assessed using traditional plating technique which provides the total viable counts (TVCs) of anaerobic bacteria. This outcome measure is AUC of change from baseline in log TVC. AUC for each time-point were calculated individually for each participant for each treatment and were aggregated into an AUC measurement. The aggregated AUC measurement was calculated in the order that first the collected data is logged which is further analyzed by change in log. Then, AUC 0-2hr change in log was calculated using the trapezoidal rule. The resulted values were then divided by 2hr to take out time units and are logged to calculate bacteria count. Hence, the outcome measure calculates change from baseline in log10-transformed AUC 0-2hr over the range from pre-treatment time point (0hr) to the concentration at 120 minutes (min) i.e., 2hr.

Secondary outcomes

  1. Change From Baseline in AUC (0-2) Hours for the Ratio of Live:Dead Bacteria Using Live-dead Staining Technique

    Time frame: Baseline up to 2 hours

    Anaerobic bacteria were counted using live:dead staining technique. Change from baseline in AUC (0-2)hr was calculated for the ratio of live and dead bacteria. Viable bacterial counts for each time-point were calculated individually for each participant for each treatment and were aggregated into an AUC measurement. AUC was calculated using the trapezoidal rule and using nominal time points. The resulted values were then divided by 2hr to take out time units. The AUC was calculated over the range from pre-treatment time point (0hr) to 2hr. In this outcome measure, the change from baseline is calculated in log ratio of live: dead.

  2. Change From Baseline in log10-transformed Total Viable Bacterial Count Using Traditional Bacterial Plating Technique

    Time frame: At Baseline, 5 minutes, 15 minutes, 30 minutes, 1 hour and 2 hours post-treatment

    Anaerobic bacteria were counted using traditional plating technique. Total viable bacterial counts for each time-point was calculated individually for each participant for each treatment. Change from baseline in log 10 transformed total viable bacterial values was calculated.

  3. Change From Baseline in Live:Dead Bacteria Ratio in Saliva Using Staining Technique

    Time frame: At Baseline, 30 minutes, 1 hour and 2 hours post-treatment

    Anaerobic bacteria were counted using live:dead staining technique. Change from baseline was calculated for the ratio of live to dead bacteria.

Sponsors and collaborators

Lead sponsor

GlaxoSmithKline

Industry

Registry information

Official study title

In-house Study to Determine the Effect of Two Zinc-containing Toothpaste Formulations on Viability of Bacteria in Saliva

Important dates

Study start
2014
Primary completion
2014
Study completion
2014
First posted
Jul 16, 2018
Registry last updated
Jul 15, 2019

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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