title: A comparative clinical study investigating the efficacy of a dentifrice containing 8% strontium acetate and 1040 ppm fluoride in a silica base and a control dentifrice containing 1450 ppm fluoride in a silica base to provide immediate relief of dentin hypersensitivity.
abstract: OBJECTIVE
  The objective of this clinical study was to evaluate and compare the efficacy of a dentifrice containing 8% strontium acetate and 1040 ppm fluoride (from sodium fluoride) in a silica base (test dentifrice) to a control dentifrice containing 1450 ppm fluoride (from sodium fluoride) in a silica base, to reduce dentin hypersensitivity immediately after a single dab-on self-application, and after subsequent twice-daily brushing for three days.
  
  
  METHODS
  This was a randomized, examiner-blind, two-arm parallel group, three-day clinical study with seventy-nine subjects, stratified based on baseline tooth sensitivity. Tooth sensitivity was determined through subject responses to both evaporative (Schiff and Visual Analogue Scale [VAS]) and tactile stimuli (Yeaple probe), prior to and immediately after subjects self-applied a single pea-sized amount of either the test or control dentifrice to qualifying sensitive teeth, massaging the toothpaste onto the sensitive area for one minute. Tooth sensitivity was further assessed in response to the same stimuli after subjects brushed twice daily for an additional three days. Subject assessments were performed by the same examiner throughout the study.
  
  
  RESULTS
  Seventy-nine subjects completed this clinical study. Both subject groups exhibited reductions in dentin hypersensitivity directly after a single dab-on application. These reductions were significant across all measures for the test dentifrice. Between-treatment analyses showed the test dentifrice to be significantly better at relieving subjects' sensitivity across all measures (Schiff p = 0.0003, tactile p = 0.0003, and VAS p = 0.0077) compared to the control. After the additional three days of twice-daily brushing, between-treatment analyses showed the test dentifrice to be significantly better at relieving subjects' sensitivity across all measures (Schiff p = 0.0102, tactile p = 0.0493, and VAS p = 0.0067) than the control dentifrice.
  
  
  CONCLUSIONS
  The 8% strontium acetate, 1040 ppm fluoride dentifrice provided significant within-treatment reductions in dentin hypersensitivity for all measures at both time points (immediate and three-day brushing). Compared to the control dentifrice, significant between-treatment reductions in sensitivity were observed after a single dab-on application for all measures, and following the additional twice-daily brushing for three days in favor of the 8% strontium acetate, 1040 ppm fluoride dentifrice.
authors.affiliation: GlaxoSmithKline Consumer Healthcare, Weybridge, Surrey, UK. stephen.x.mason@gsk.com
authors.forename: Stephen
authors.initials: S
authors.lastname: Mason
authors.forename: Nathan
authors.initials: N
authors.lastname: Hughes
authors.forename: Farzana
authors.initials: F
authors.lastname: Sufi
authors.forename: Linda
authors.initials: L
authors.lastname: Bannon
authors.forename: Brenda
authors.initials: B
authors.lastname: Maggio
authors.forename: Mairead
authors.initials: M
authors.lastname: North
authors.forename: Jon
authors.initials: J
authors.lastname: Holt
mesh_terms: D000085:Acetates / Q000627:therapeutic use*; D000287:Administration, Topical; D000328:Adult; D000388:Air; D003802:Dentifrices / Q000627:therapeutic use*; D057133:Dentin Desensitizing Agents / Q000627:therapeutic use*; D003807:Dentin Sensitivity / Q000145:classification / Q000188:drug therapy*; D004311:Double-Blind Method; D005260:Female; D005459:Fluorides / Q000008:administration & dosage / Q000627:therapeutic use*; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D010812:Physical Stimulation; D012822:Silicon Dioxide; D012969:Sodium Fluoride / Q000008:administration & dosage / Q000627:therapeutic use; D013324:Strontium / Q000627:therapeutic use*; D014099:Toothbrushing / Q000295:instrumentation; D014110:Touch; D016896:Treatment Outcome
chemical_list: D000085:Acetates; D003802:Dentifrices; D057133:Dentin Desensitizing Agents; C106741:strontium acetate; D012822:Silicon Dioxide; D012969:Sodium Fluoride; D005459:Fluorides; D013324:Strontium