title: Three-dimensional in vitro measurements of tooth wear using fluoridated dentifrices.
abstract: The aim of this study was to compare differences in wear of human enamel and dentine in vitro using a 3D measurement method comparing silica versus non-silica containing fluoridated dentifrices (Colgate Total(™) [CT] or Fluor Protector Gel(™) [FPG]).
  
  
  
  Mounted native enamel (n = 36) and polished dentine (n = 36) samples were subjected to 10 wear cycles. Each cycle consisted of: (1) 1 hour remineralization in artificial saliva (AS); (2) 10 minute erosion (0.3% citric acid; pH = 2.8); (3) 2 minute toothbrush abrasion in AS (G1, control) or a slurry of 3:1 by weight of AS:dentifrice (G2 = CT; G3 = FPG) under a load of 2 N. Each group contained 12 enamel and 12 dentine samples. Paired pre- and post-wear scans made with a contacting scanner were digitally superimposed using ball bearings as datum.
  
  
  
  Mean and (SD) enamel wear was G1 = 21.9 μm (6.4); G2 = 15.2 μm (2.8); G3 = 16.9 μm (3.2). Enamel wear was not different between dentifrices (p = 0.99). Both dentifrices resulted in less enamel wear compared to the control (p < 0.05). Dentine wear was G1 = 41.3 μm (8.1); G2 = 29.1 μm (4.4); G3 = 22.1 μm (3.5). Differences in measurements were observed between dentifrices and control (p < 0.05) and between dentifrices (p = 0.014) with FPG showing less dentine wear than CT.
  
  
  
  FPG offered protection against erosive/abrasive tooth wear in dentine compared to CT. FPG did not offer such protective effect on enamel wear.
authors: Prosthodontics Unit, UCL Eastman Dental Institute, London, United Kingdom.
authors: A
authors: A
authors: Al-Mashhadani
authors: Prosthodontics Unit, UCL Eastman Dental Institute, London, United Kingdom.
authors: I
authors: I
authors: Plygkos
authors: Biomaterials Unit, UCL Eastman Dental Institute, London, United Kingdom.
authors: L
authors: L
authors: Bozec
authors: Prosthodontics Unit, UCL Eastman Dental Institute, London, United Kingdom.
authors: J M
authors: JM
authors: Rodriguez
mesh_terms: D003743:Dental Enamel / Q000000981:diagnostic imaging / Q000187:drug effects; D003802:Dentifrices / Q000009:adverse effects* / Q000494:pharmacology; D003804:Dentin / Q000000981:diagnostic imaging / Q000187:drug effects; D005459:Fluorides; D006801:Humans; D012822:Silicon Dioxide; D014077:Tooth Erosion / Q000000981:diagnostic imaging / Q000209:etiology* / Q000517:prevention & control; D014089:Tooth Remineralization / Q000379:methods; D014099:Toothbrushing / Q000009:adverse effects*
chemical_list: D003802:Dentifrices; D012822:Silicon Dioxide; D005459:Fluorides
keywords: Abrasion; erosion; surface matching; three-dimensional; two-dimensional