The Effects of Potassium Nitrate in Reducing Dentinal Hypersensitivity

Phase 1

Completed

Conditions: Dental Pain
Dentinal Hypersensitivity

Interventions: Drug: Placebo
Drug: Potassium Nitrate

Registration Number: NCT01587950

Lead Sponsor: GlaxoSmithKline

Brief Summary: 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.

Detailed Description: Not available

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 12

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.

Study & Design

Study Type: INTERVENTIONAL

Study Design: CROSSOVER

Arm && Interventions

Group	Intervention	Description
Sterile water	Placebo	Participants to receive 250 microlitres (μL) of sterile water.
Potassium nitrate 5% solution	Potassium Nitrate	Participants to receive 250 μL of potassium nitrate 5% solution.
Potassium nitrate 2.5% solution	Potassium Nitrate	Participants to receive 250 μL of potassium nitrate 2.5% solution.

Primary Outcome Measures

Name	Time	Method
Adjusted Mean Change From Baseline in Evaporative Sensitivity Pain Response of Hypersensitive Tooth on a VAS, 10 Minutes Post Application of 5% KNO3 Solution, 2.5% KNO3 Solution and Sterile Water	Baseline, 10 minutes post administration of treatment	Response to a constant (duration, pressure, temperature, distance from target) jet of air applied to a hypersensitive tooth was evaluated using a 100 mm VAS pain response scale. According to this analog scale, pain response for stimulated tooth ranged from 0 (no pain) to 100 (intense pain). Change from baseline in pain response was calculated using VAS score at 10 minutes post treatment.
Adjusted Mean Change From Baseline in Evaporative Sensitivity Pain Response of Hypersensitive Tooth on a Visual Analogue Scale (VAS) Immediately Post Application of 5% KNO3 Solution, 2.5% KNO3 Solution and Sterile Water	Baseline, immediately post administration of treatment	Response to a constant jet of air applied to a hypersensitive tooth was evaluated using a 100 millimeter (mm) VAS pain response scale. According to this analog scale, pain response for stimulated tooth ranged from 0 (no pain) to 100 (intense pain). Change from baseline in pain response was calculated using VAS score immediately post treatment.
Adjusted Mean Change From Baseline in Evaporative Sensitivity Pain Response of Hypersensitive Tooth on a VAS, 20 Minute Post Application of 5% KNO3 Solution, 2.5% KNO3 Solution and Sterile Water	Baseline, 20 minutes post administration of treatment	Response to a constant (duration, pressure, temperature, distance from target) jet of air applied to a hypersensitive tooth was evaluated using a 100 mm VAS pain response scale. According to this analog scale, pain response for stimulated tooth ranged from 0 (no pain) to 100 (intense pain). Change from baseline in pain response was calculated using VAS score at 20 minutes post treatment.