title: Randomized, placebo-controlled study of the efficacy of a calcium phosphate containing paste on dentin hypersensitivity.
abstract: OBJECTIVE
  Hypersensitivity of non-carious cervical lesions (DH) is a frequently encountered disease. This randomized, controlled, single-blind crossover study evaluated the effectiveness of a calcium phosphate containing desensitizer paste (TAP) on DH in comparison to water as placebo (PLA).
  
  
  METHODS
  In this clinical trial 35 patients were randomly assigned to the test and the negative control group. Using a 10cm long VAS (visual analog scale) patients should respond with DH score >6 on one tooth in each of two quadrants for allocation. Pain stimuli were a 2-seconds air blast (AB) and probe scratching (PS) of the exposed dentin. VAS scores were determined pre-operatively (PRE), immediately after treatment (POST), at 1 week, 1, 3 and finally after 6 months.
  
  
  RESULTS
  Both TAP and PLA applications decreased DH significantly at POST and throughout the 6-months recalls (p<0.001). Pain reductions upon AB stimulation of TAP treated teeth, assessed at POST and 6 months were 35 and 55%, upon PS stimuli 21 and 54%, respectively. PLA treated lesions responded to AB at POST and after 6 months with 20 and 36% pain reduction, to PS with 11 and 30% pain reduction, respectively. Differences between TAP and PLA pain scores were statistically significant at all recalls (p<0.05).
  
  
  CONCLUSIONS
  TAP paste reduced DH successfully during this 6-months trial. The calcium phosphate crystallites included in the paste and the presumed hydroxyapatite precipitates upon exposure to saliva were hypothetically able to occlude open dentinal tubules, at least to some extent. TAP is considered a biocompatible desensitizer paste.
authors.affiliation: Department of Conservative Dentistry and Endodontics, Vokkaligara Sangha Dental College and Hospital, K.R. Road, V.V. Puram, Bangalore 560004, India. Electronic address: drdeemehta@gmail.com.
authors.forename: Deepak
authors.initials: D
authors.lastname: Mehta
authors.affiliation: Department of Conservative Dentistry and Endodontics, Vokkaligara Sangha Dental College and Hospital, K.R. Road, V.V. Puram, Bangalore 560004, India. Electronic address: vishu.dent@gmail.com.
authors.forename: Vishwas
authors.initials: V
authors.lastname: Gowda
authors.affiliation: Liaison Center for Innovative Dentistry, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan. Electronic address: wjfinger@dent.tohoku.ac.jp.
authors.forename: Werner J
authors.initials: WJ
authors.lastname: Finger
authors.affiliation: Liaison Center for Innovative Dentistry, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan; Department of Oral Function and Morphology, Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan. Electronic address: keii@dent.tohoku.ac.jp.
authors.forename: Keiichi
authors.initials: K
authors.lastname: Sasaki
mesh_terms: D000293:Adolescent; D000328:Adult; D002130:Calcium Phosphates; D018592:Cross-Over Studies; D057133:Dentin Desensitizing Agents; D003807:Dentin Sensitivity / Q000188:drug therapy*; D005260:Female; D006801:Humans; D008297:Male; D009824:Ointments; D016037:Single-Blind Method; D014100:Toothpastes; D055815:Young Adult
chemical_list: D002130:Calcium Phosphates; D057133:Dentin Desensitizing Agents; D009824:Ointments; D014100:Toothpastes
keywords: Biomaterial; Calcium-phosphate; Desensitization; Hypersensitive dentin; Randomized controlled trial