The Effects of Potassium Nitrate in Reducing Dentinal Hypersensitivity

GlaxoSmithKline (GSK)

Status and phase: Completed; Phase 1

Conditions: Dental Pain; Dentinal Hypersensitivity

Treatments: Drug: Potassium Nitrate; Drug: Placebo

Study type: Interventional

Funder types: Industry

Identifiers

NCT01587950

Z3770631

Details and patient eligibility

About

A randomized, controlled, double blind exploratory study to explore the effects of two different potassium nitrate concentrations and water on exposed dentine in reducing dentinal hypersensitivity. Solutions will be applied for either 2, 5 or 10 minutes and assessed by visual analogue scale (VAS) scores following evaporative (air) stimulus.

Enrollment: 12 patients

Sex: All

Ages: 18 to 65 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• General Health and Oral Heath: Good general health and oral health with (in the opinion of the investigator) no clinically significant and relevant abnormalities of medical history.
• Teeth: Presence of teeth in various locations in the mouth to determine stent success. Required teeth include: at least three first molars; a maxillary incisor, cuspid and bicuspid; and a mandibular incisor, cuspid and bicuspid.
• Dental Sensitivity: a) Self-reported history of dentinal hypersensitivity lasting more than 6 months and a primary complaint of sensitive teeth. b) A minimum of three accessible teeth that can be isolated that meet all of the following criteria at the screening visit: i. Teeth showing signs of facial/cervical gingival recession and/or signs of erosion or abrasion. Study teeth must exhibit greater than or equal to 3mm recession at the facial surface midpoint. ii. Teeth must be visually stain and calculus free. iii. Teeth having a gingival index score less than or equal to 2. iv. Teeth with a clinical mobility of less than or equal to 1. v. Teeth that show signs of sensitivity, evaporative (air) sensitive teeth displaying a response of greater than or equal to 30 mm on a 100 mm visual analogue scale (VAS). c) A minimum of three eligible teeth identified at the screening visit that continue to show signs of sensitivity at the baseline assessment at treatment visit 1, evaporative (air) sensitive teeth displaying a response of greater than or equal to 30 mm on a 100 mm VAS.

Exclusion criteria

• Allergy/Intolerance: Known or suspected intolerance or hypersensitivity to the stent materials (or closely related compounds) or any of their stated ingredients.
• Condition of the Dentition: a) Sensitive teeth not expected to respond to treatment with an over-the-counter (OTC) dentifrice in the opinion of the investigator. b) Teeth with exposed dentine but with deep, defective or facial restorations, teeth used as abutments for fixed or removable partial dentures, teeth with full crowns, orthodontic bands, extensive caries or cracked enamel. Sensitive teeth with contributing aetiologies other than erosion, abrasion or recession of exposed dentine.

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Crossover Assignment

Masking: Double Blind

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12 participants in 3 patient groups, including a placebo group

Sterile water

Placebo Comparator group

Description:

Participants to receive 250 microlitres (μL) of sterile water.

Treatment:

Drug: Placebo

Potassium nitrate 5% solution

Experimental group

Description:

Participants to receive 250 μL of potassium nitrate 5% solution.

Treatment:

Drug: Potassium Nitrate

Potassium nitrate 2.5% solution

Experimental group

Description:

Participants to receive 250 μL of potassium nitrate 2.5% solution.

Treatment:

Drug: Potassium Nitrate