title: Evaluation of dentin abrasion during professional tooth cleaning in an in vitro model.
abstract: OBJECTIVE
  Professional tooth cleaning (PTC) may lead to loss of exposed dentin. The aim of the present study was to determine the absolute loss of dentin during PTC using various product combinations with an in vitro model.
  
  
  METHODS
  Dentin specimens (72) were randomly assigned to nine groups. In four groups each, prophy brushes and prophy cups were used in combination with four different abrasives (calcium pyrophosphate, pumice, Hawe cleanic, Nupro coarse). In the ninth group, a rubber cup with embedded fluoride and abrasives was used (pasteless prophy cup). The treatment time was 37 s. Surface loss was determined by profilometry.
  
  
  RESULTS
  The surface loss in the nine groups was as following: (1) brush/calcium pyrophosphate: 6.18 microm (a); (2) brush/pumice: 5.51 microm; (3) brush/Nupro coarse: 10.10 microm (b); (4) brush/Hawe cleanic: 1.88 (a, b); (5) prophy cup/calcium pyrophosphate 2.07 (c); (6) prophy cup/pumice: 6.07 microm; (7) prophy cup/Nupro coarse: 5.93 microm (c); (8) prophy cup/Hawe cleanic: 4.93 microm (c); (9) pasteless prophy cup: 11.86 microm (c). Groups with the same letter in parentheses are statistically significant different at p<0.05. In a pooled analysis, no statistically significant difference between brushes and prophy cups was found.
  
  
  CONCLUSIONS
  In the present study, the surface loss of about eight PTC procedures was simulated. Hence, the dentin loss ranged between 0.24 and 1.48 microm per PTC. Therefore, PTC does not seem to be a main factor in dentin loss.
authors.affiliation: Department of Operative and Preventive Dentistry and Endodontics, Heinrich-Heine-University, Düsseldorf, Germany. zimmer@med.uni-duesseldorf.de
authors.forename: S
authors.initials: S
authors.lastname: Zimmer
authors.forename: C R
authors.initials: CR
authors.lastname: Barthel
authors.forename: L
authors.initials: L
authors.lastname: Coffman
authors.forename: W H-M
authors.initials: WH
authors.lastname: Raab
authors.forename: J J
authors.initials: JJ
authors.lastname: Hefferren
mesh_terms: D000149:Acidulated Phosphate Fluoride; D002131:Calcium Pyrophosphate / Q000009:adverse effects; D045424:Complex Mixtures; D003777:Dental Prophylaxis / Q000009:adverse effects*; D003802:Dentifrices / Q000009:adverse effects; D003804:Dentin / Q000187:drug effects*; D006801:Humans; D018709:Statistics, Nonparametric; D014072:Tooth Abrasion / Q000209:etiology*
chemical_list: D045424:Complex Mixtures; D003802:Dentifrices; C074808:NuPro; D000149:Acidulated Phosphate Fluoride; D002131:Calcium Pyrophosphate