title: Volumetric microleakage assessment of glass-ionomer-resin composite hybrid materials.
abstract: OBJECTIVE
  This study was intended to quantify the marginal leakage of three glass-ionomer-resin composite hybrid materials and compare it with the leakage exhibited by a glass-ionomer cement and a bonded resin composite system.
  
  
  METHODS
  Standardized Class V cavities were prepared on root surfaces of 105 extracted human teeth, randomly assigned to five groups of 21 each, and restored with either Ketac-Fil Aplicap, Z100/Scotchbond Multi-Purpose Plus, Vitremer, Photac-Fil Aplicap, or Dyract. The teeth were thermally stressed for 500 cycles and stained with methylene blue. The microleakage was quantified spectrophotometrically, and the data were statistically analyzed with Friedman's test.
  
  
  RESULTS
  There were no significant differences in microleakage among the five groups. Restorations of all tested materials showed some marginal leakage in Class V cavities.
  
  
  CONCLUSIONS
  The microleakage performance of glass-ionomer-resin composite hybrid materials was similar to those of a conventional glass-ionomer and a bonded resin composite system.
authors.affiliation: School of Dentistry, Federal University of Minas Gerais, Belo Horizonte, Brazil.
authors.forename: C S
authors.initials: CS
authors.lastname: de Magalhães
authors.forename: M C
authors.initials: MC
authors.lastname: Serra
authors.forename: A L
authors.initials: AL
authors.lastname: Rodrigues Júnior
mesh_terms: D016009:Chi-Square Distribution; D020770:Compomers; D003188:Composite Resins; D003763:Dental Leakage / Q000175:diagnosis; D003793:Dental Restoration, Permanent / Q000379:methods*; D017220:Dentin-Bonding Agents; D005069:Evaluation Studies as Topic; D005899:Glass Ionomer Cements; D006801:Humans; D016014:Linear Models; D008298:Maleates; D008689:Methacrylates; D019279:Resin Cements; D012117:Resins, Synthetic; D017640:Silicates; D012822:Silicon Dioxide; D013053:Spectrophotometry; D018709:Statistics, Nonparametric; D015040:Zirconium
chemical_list: D020770:Compomers; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C088486:Dyract; D005899:Glass Ionomer Cements; D008298:Maleates; D008689:Methacrylates; C081144:Photac-Fil; D019279:Resin Cements; D012117:Resins, Synthetic; C084018:Scotchbond Multi-Purpose; D017640:Silicates; C084550:Vitremer; C083568:Z100 composite resin; D012822:Silicon Dioxide; C040964:Ketac-Fil; D015040:Zirconium