title: The erosion-inhibiting effect of TiF4, SnF2, and NaF solutions on pellicle-covered enamel in vitro.
abstract: OBJECTIVE
  The aim of this study was to compare the protective effect of TiF(4), SnF(2), and NaF treatment on the development of erosion-like lesions in pellicle-covered human enamel.
  
  
  METHODS
  Twelve human molars were each divided into 5 specimens, 4 of which were immersed in saliva for 2 h. Three pellicle-covered specimens from each tooth were treated with a TiF(4), SnF(2), or NaF solution (all 0.5 M F) for 2 min. Control specimens, one with and one without pellicle, were included. Immersion in acid (0.01 M HCl) was carried out stepwise (2+2+2+2 min). The etching depths (in microm) were measured using white light interferometry.
  
  
  RESULTS
  Compared with the control with pellicle, TiF(4) reduced enamel loss by 100% after 2 min and by 24% after 8 min of acid exposure. The corresponding values for SnF(2) were 45% and 14%. NaF provided no significant protection of the surface. The pellicle-covered specimens showed reduced lesion depths after 6 and 8 min compared to the controls without pellicle.
  
  
  CONCLUSIONS
  TiF(4) gave the best protection against acid attack. SnF(2) provided significant protection only after 2 min of acid exposure, while NaF had no significant protective effect.
authors: Faculty of Dentistry, University of Oslo, Norway. lenehh@odont.uio.no
authors: Lene Hystad
authors: LH
authors: Hove
authors: Børge
authors: B
authors: Holme
authors: Alix
authors: A
authors: Young
authors: Anne Bjørg
authors: AB
authors: Tveit
mesh_terms: D002327:Cariostatic Agents / Q000627:therapeutic use*; D003743:Dental Enamel / Q000473:pathology; D044622:Dental Pellicle / Q000502:physiology*; D005459:Fluorides / Q000627:therapeutic use*; D006801:Humans; D006851:Hydrochloric Acid; D007368:Interferometry; D008963:Molar; D012969:Sodium Fluoride / Q000627:therapeutic use; D013499:Surface Properties; D014002:Tin Fluorides / Q000627:therapeutic use; D014025:Titanium / Q000627:therapeutic use; D014077:Tooth Erosion / Q000517:prevention & control*
chemical_list: D002327:Cariostatic Agents; D014002:Tin Fluorides; D012969:Sodium Fluoride; D014025:Titanium; D005459:Fluorides; D006851:Hydrochloric Acid; C032240:titanium tetrafluoride