title: A five year study. Fluoride release of four reinforced composite resins.
abstract: OBJECTIVE
  The purpose of this study was to record the fluoride released measured in parts per million of four fluoride composite resins for five years.
  
  
  METHODS
  Four fluoridated composites were separated into four groups. Two composite resins with high viscosity were core materials, Ti-Core with titanium (group 1) and Ti-Core Natural (group 2) and the other two resins studied were low viscosity post cements Flexi-Flow cement with titanium (group 3) and Flexi-Flow Natural (group 4). The fluoride release was studied under four experimental conditions. Three replications were studied in each condition. Fluoride release was measured for 260 weeks (5 years).
  
  
  METHODS
  A one-way analysis of variance (ANOVA) was used to compare the average weekly release followed by a Student-Newman-Keuls (SNK) pairwise multiple comparison test. All results were considered statistically significant if p < 0.05.
  
  
  RESULTS
  The ANOVA analysis released a significant statistical interaction between group and week (p < 0.0001). Further analysis showed that the average weekly release for Ti-Core with titanium did not differ from Ti-Core Natural, and that Ti-Core with titanium and Ti-Core Natural differed from both Flexi-Flow Natural and Flexi-Flow with titanium, which were not different from one another.
  
  
  CONCLUSIONS
  Ti-Core with titanium (Group 1) and Ti-Core Natural (Group 2) released a greater amount of fluoride than Flexi-Flow with titanium (Group 3) and Flexi-Flow Natural (Group 4). The fluoride released from these fluoridated resin composites are similar to reported ranges of other fluoride releasing dental restoration materials.
authors.forename: B I
authors.initials: BI
authors.lastname: Cohen
authors.forename: M K
authors.initials: MK
authors.lastname: Pagnillo
authors.forename: A S
authors.initials: AS
authors.lastname: Deutsch
authors.forename: B L
authors.initials: BL
authors.lastname: Musikant
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D003738:Dental Cements; D003793:Dental Restoration, Permanent / Q000379:methods*; D005459:Fluorides / Q000008:administration & dosage* / Q000737:chemistry; D015999:Multivariate Analysis; D019279:Resin Cements / Q000737:chemistry*; D018709:Statistics, Nonparametric; D014025:Titanium; D014783:Viscosity
chemical_list: D003188:Composite Resins; D003738:Dental Cements; C101038:Flexi-Flow Natural; C101035:Flexi-Flow cement; D019279:Resin Cements; C079578:Ti-Core composite resin; D014025:Titanium; D005459:Fluorides