A Study Comparing the Interproximal Plaque and Gingivitis Effects of Three Interdental Cleaning Modalities

Primary Endpoint The primary endpoint of this study is the residual protein concentration in posterior sites following single use treatment with either manual toothbrush, manual toothbrush + Sonicare IP cleaning prototype, manual toothbrush + Waterpik Ultra Water Flosser or manual toothbrush + floss.

Secondary Endpoints Gingival bleeding index and Modified gingival index following single use treatment with either MTB, MTB + IP cleaning prototype, MTB + Waterpik Waterflosser or MTB + floss.

Comparisons of the concentration levels of 272 different pathogens between treatment groups

Biomarker profiles following the different treatment modalities

Safety endpoints based on adverse events and intraoral exam (soft tissue evaluation).

IP cleaning satisfaction questionnaire following treatment with either MTB, MTB + IP cleaning prototype, MTB + Waterpik Waterflosser or MTB + floss.

Expected Duration of Study The planned duration of a subject's participation in this study is approximately 2 weeks.

Discontinuation Criteria/Stopping Rules If in the opinion of the investigator, the health or safety of a subject is affected adversely by participation in the study or non-compliance to at-home oral hygiene regimen adversely effects test product familiarization or plaque regrowth, the subject will be removed.

Controls to Minimize Bias All eligible subjects will be randomized at Visit 1. Randomization of Subjects and Balance of Test Groups Subjects will be randomized to one of the four treatment groups according to a 1:1:1:1 ratio. Randomization will be stratified by gender to complete with approximately 68 subjects.

Blinding The examiner and laboratory personnel will be blinded.

Maintenance of randomization Codes In order to minimize bias, this study will be randomized and single blind - the Examiners performing the interproximal plaque sampling and gingivitis assessment are the designated blinded personnel. Unblinding of study data will not occur until after all study procedures have been completed.

Experimental Regimen and Product Labeling The devices used in this study are subject only to Class I (general controls) and considered exempt from the premarket notification procedures and not subject to section 510(k), 515, or 520(m,) of the FDC Act in order to be legally marketed. Thus, the study does not meet the definition of an Applicable Clinical Trial.

Each subject will receive an ADA Reference manual toothbrush, timer, dentifrice and, if assigned, an IP cleaning device (either Sonicare Prototype, Crest Glide Floss or Waterpik Ultra Water Flosser (WP 100) with the Classic Jet Tip). Subjects are to brush twice daily for two minutes and, if assigned, use their IP cleaning device once daily, in the evening, after toothbrushing. The Directions for Use for all devices can be found in the protocol Appendices and should be reviewed with the subjects who shall demonstrate proper usage at the time of product assignment.

Methods and Treatments not Permitted on Study Once enrolled on-study, the use of any additional oral hygiene treatments and aids other than those prescribed is prohibited. A list of prohibited devices and aids includes but is not limited to mouthwash, chewing gum, whitening products, non-assigned interproximal cleaning aids/devices or breath films. The use of any dentifrice other than that dispensed at Visit 2 is prohibited. In the event that an enrolled subject requires dental care outside the scope of the study, he/she will be discontinued from the trial.

The use of antibiotics or antibacterial agents while participating on the study is also prohibited and subjects who are required to use them will be removed from the dataset for endpoint analysis. The use of prescription strength and repeat dose of non-steroidal anti-inflammatories and anticoagulants (including Aspirin) for longer than 2 days is also prohibited.

All deviations from the prescribed treatment will be documented and continued eligibility will be reassessed.

Determination of Sample Size Sample size justification is based on considerations of statistical power for detecting a difference in mean residual protein concentration (RPC) between the manual toothbrush group and the manual toothbrush + Sonicare Interproximal (IP) Cleaning Prototype group. A sample size of 17 per group at visit 3 (the anticipated sample size after allowance for dropout) will provide 80% power for detecting a difference in mean RPC between groups of 4.71 (µg/ml) assuming a subject-level standard error of the average of two RPC measurements of 4.76 (the square of this standard error is the variance determined from assuming an RPC IP site-specific standard deviation of 6.15, and an intramouth correlation of the two RPC measurements of 0.2, as estimated from a statistical model (see 8.6) for preliminary data that adjusts for baseline RPC).