title: Study on the potential inhibition of root dentine wear adjacent to fluoride-containing restorations.
abstract: The purpose of this in vitro study was to determine whether the vicinity of root dentine that had been restored with fluoride-releasing materials was at reduced risk for erosive/abrasive wear compared to root dentine restored with a non-fluoride-containing material. According to a randomized complete block design, standardized cavities prepared on the surface of 150 bovine root dentine slabs were restored with glass-ionomer cement, resin-modified glass ionomer, polyacid-modified resin composite, fluoride-containing or conventional composite. Specimens were coated with two layers of an acid-resistant nail varnish exposing half of the dentine surface and half of the restoration. Subsequently, specimens were either eroded in an acidic drink or left uneroded, then exposed to artificial saliva and abraded in a toothbrushing machine. Wear depth in the vicinity of restorations was quantified by a stylus profilometer, based on the nonabraded areas surrounding the erosion/abrasion region. Two-way ANOVA did not demonstrate significant interaction between restoratives and eroded-uneroded dentine (p=0.5549) nor significant difference among restorative materials (p=0.8639). Tukey's test ascertained that the wear depth was higher for eroded than for uneroded groups. Fluoride-releasing materials seemed to negligibly inhibit wear in the vicinity of restored root dentine subjected to erosive/abrasive challenges.
authors.affiliation: Faculdade de Odontologia de Ribeirão Preto, Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, s/n-Monte Alegre, CEP 14040-904 Ribeirao Preto, SP, Brazil. cturssi@yahoo.com
authors.forename: Cecilia Pedroso
authors.initials: CP
authors.lastname: Turssi
authors.forename: Anderson Takeo
authors.initials: AT
authors.lastname: Hara
authors.forename: Silvia Jorge
authors.initials: SJ
authors.lastname: Domiciano
authors.forename: Mônica Campos
authors.initials: MC
authors.lastname: Serra
mesh_terms: D000180:Acrylic Resins; D000704:Analysis of Variance; D000818:Animals; D002417:Cattle; D003793:Dental Restoration, Permanent / Q000379:methods*; D005459:Fluorides / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007180:Incisor; D008422:Materials Testing; D011897:Random Allocation; D012464:Saliva, Artificial; D012822:Silicon Dioxide; D014072:Tooth Abrasion; D014077:Tooth Erosion; D014092:Tooth Root / Q000378:metabolism; D014099:Toothbrushing
chemical_list: D000180:Acrylic Resins; D012464:Saliva, Artificial; C015897:glass ionomer; D012822:Silicon Dioxide; D005459:Fluorides