A Phase I/II Study to Evaluate the Safety and Efficacy of PerioSept® as Adjunct to SRP in Subjects With Periodontitis

This trial will follow an adaptive trial design, whereby information regarding PerioSept(r)
drug levels will be obtained via a PK trial lead in period (PK Pilot) in a limited number of
subjects (up to N=8). This will be followed by the main safety and efficacy trial of
PerioSept(r) as an adjunct to scaling and root planing (SRP) in subjects with moderate to
severe periodontitis (Main Trial, N=87). The PK Pilot will be an open label PK study. Up to 8
qualifying subjects will receive SRP on Day 1 followed by 3% PerioSept(r) administered in a
minimum of 4 qualifying periodontal Study Pockets in at least 2 quadrants with a probing
pocket depth (PPD) ≥ 5mm and bleeding on probing (BOP) and at least 20 other qualifying
pockets (PPD ≥ 5 mm). The Main Trial will be a multi-center, randomized, blinded, placebo
controlled, parallel arm trial of PerioSept(r) (0.3%, 1% or 3%) administered up to three
times (over Days 1 and 2, at Weeks 4 and 12) into a minimum of 4 qualifying periodontal Study
Pockets in at least 2 quadrants with a PPD ≥ 5mm and BOP following SRP at baseline. All other
eligible pockets with a PPD ≥ 5mm will also be treated.

Full mouth SRP will be initiated on Day 1 followed by randomized treatment of that side. If
necessary, SRP and randomized treatment may be completed on the other side of the mouth on
Day 2. Treated pockets that still have a PPD ≥ 5mm at the 4 and 12 week visits will be
retreated with SRP or SRP plus placebo or PS, as randomized. Assessments will be conducted
over a 24 week (6 month) period including safety assessments and assessments of dental
parameters (PPD, BOP, Plaque index, Gingival Index, Clinical attachment level).

Inclusion Criteria:

- 18 to 74 years of age, inclusive

- Diagnosed with moderate to severe generalized periodontitis (ADA Classification Case
Type III or IV)

- Must have at least 4 qualifying Study Pockets (PPD ≥ 5mm and BOP) in at least 2
quadrants (main trial)

- Subjects must sign informed consent document(s) prior to initiation of any
study-specific procedures and treatments

- Agree to utilize study-provided tooth paste and tooth brush and agree to follow their
standard oral hygiene routine with limitations noted below from the Day 1 visit
through the end of the study

- Sexually active subjects (both men and women) who agree to use acceptable
contraceptive methods for the duration of the study

- Able and willing to adhere to the study visit schedule and other protocol requirements

Exclusion Criteria:

- History of and/or known risk of life-threatening anaphylactic reactions to
taurolidine, any of the components in the PS drug product, and other drugs or agonists
(e.g., penicillin, nuts, insect stings)

- Presence of an acute periodontal abscess

- Known endodontic disease

- Diabetes uncontrolled by medication defined as fasting blood glucose documented at
≥200 mg/dL within 90 days of Day 1

- History of illegal drug or alcohol abuse within the past 12 months and/or testing
positive for illegal drugs (including marijuana) at the Screening Visit

- Pregnant or nursing female subjects; women of child-bearing potential must have a
negative serum or urine pregnancy test within 30 days and within 24 h prior to all
treatment/dosing days

- Use of systemic antibiotics and topically applied oral antibiotics and other
antimicrobial agents (e.g., chlorhexidine) during the trial and within 30 days of Day
1.

- An existing condition that may warrant use of antibiotics during the trial (e.g.,
white blood cell count indicative of ongoing infection noted at Screening Visit,
subject with cystic fibrosis or chronic obstructive pulmonary disorder with history of
frequent, recurrent lung infections)

- History of and/or testing positive for Hepatitis B or C, Human Immunodeficiency Virus
or other immunedeficiency syndrome or positive test for such at Screening Visit

- Use of chewing gum of any kind and dental flossing for one week after all study
treatments and use of any other oral dentifrices or oral health agents/treatments
other than those provided herein for the study duration

- Use within 30 days prior to Day 1, during trial or a condition for which use is
anticipated during trial: topical oral, nasal and systemic corticosteroids, chronic (2
continuous weeks) non-steroidal anti-inflammatory drugs (NSAIDs)

- Use of the agents known to affect periodontal status during the trial and/or use
within 30 days prior to Day 1: immunesuppressants, calcium antagonist, phenytoin or
anticoagulants

- Heavy smokers/tobacco users are excluded: defined as those smoking ≥ 10 cigarettes or
≥ 4 cigars or ≥ 4 pipes per day

- For non-heavy smokers, smoking ≥ 10 cigarettes or ≥ 4 cigars or ≥ 4 pipes per day is
prohibited for the duration of the trial

- Use of electronic/smokeless and herbal cigarettes/pipes and oral smokeless/chewing
tobacco within 30 days of Day 1 excluded and all use of these products is prohibited
during trial

- Clinically significant (e.g., QTc interval >450 milliseconds) abnormal
electrocardiogram (ECG) noted at Screening Visit

- Participation in another clinical study with an investigational agent within 90 days
prior to Day 1

- Subjects who received oral health treatments/interventions within 90 days of Day 1,
which the investigator believes may interfere with the periodontal parameters to be
assessed in this study (e.g., significant dental and/or gum/oral tissue work).

- Subject has a medical and/or dental condition and/or uses medications/supplements
which the investigator believes makes him/her unsuitable for participation in the
study