title: Effect of 1- and 4-minute treatments of topical fluorides on a composite resin.
abstract: The purpose of this in vitro study was to compare the effects of a 1-min immersion and of 4-min immersions in an acidulated phosphate fluoride (1.23% APF) foam, a 1.23% APF gel, a 2.0% sodium fluoride (NaF) gel, and water on surface topography and on weight of a composite resin (APH). Forty composite resin specimens were placed into eight groups (N = 5 each). For each treatment, a group of specimens was immersed for either 1 or 4 min (four 1-min immersions). Specimens were weighed before and after each immersion. The surface topography of two scanning electron micrographs of each specimen was scored visually by two investigators. Inter-rater reliability was r = 0.75 (intraclass correlation coefficient). There were no significant differences in the mean visual scores or weight among the 1-min immersion groups. Significantly greater surface changes and weight loss of this composite resin occurred following 4-min immersions in either 1.23% APF foam or gel as compared with those immersed in either 2.0% NaF gel or water (P 0.0001; one-way ANOVA, Tukey's Studentized Range Test).
authors.affiliation: Department of pediatric dentistry, University of North Carolina at Chapel Hill, USA.
authors.forename: K
authors.initials: K
authors.lastname: Kula
authors.forename: E L
authors.initials: EL
authors.lastname: Webb
authors.forename: T J
authors.initials: TJ
authors.lastname: Kula
mesh_terms: D000149:Acidulated Phosphate Fluoride / Q000737:chemistry; D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005460:Fluorides, Topical / Q000737:chemistry*; D005782:Gels; D007101:Immersion; D008855:Microscopy, Electron, Scanning; D015588:Observer Variation; D015203:Reproducibility of Results; D019279:Resin Cements; D012969:Sodium Fluoride / Q000737:chemistry; D013499:Surface Properties; D013997:Time Factors; D014867:Water
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D005460:Fluorides, Topical; D005782:Gels; D019279:Resin Cements; D014867:Water; C073466:Prisma APH; D000149:Acidulated Phosphate Fluoride; D012969:Sodium Fluoride