title: Sealing ability of two "compomers" applied with and without phosphoric acid treatment for Class V restorations in vivo.
abstract: BACKGROUND
  "Compomers" are being used with increasing frequency in Europe and North America.
  
  
  OBJECTIVE
  This study evaluated the marginal seal of two compomers in vivo.
  
  
  METHODS
  Periodontally involved teeth, scheduled for extraction, were selected. Four groups of a combination of materials were used (Dyract with Dyract-PSA primer, group 1; Dyract with Prime and Bond 2.0, group 2; Compoglass with SCA primer, group 3; and Compoglass with Syntac Single Component, group 4). The restorations were made in a standardized shaped cavity, across the cementoenamel junction, and the teeth were extracted after 2 to 3 months of clinical service. The specimens were kept in a solution of 2% methylene blue for 24 hours. After being embedded in epoxy resin, sections were made with a low speed saw along the longitudinal axis of the teeth. The examination of dye penetration was made with a microscope at a magnification of x20 and scoring was done at both coronal and apical sites. Kruskal-Wallis statistical analysis was performed at 5% significance level.
  
  
  RESULTS
  Groups 2 and 4 scored significantly less than groups 1 and 3 and for groups 2 and 4, 30% of the restorations exhibited leakage.
  
  
  CONCLUSIONS
  These restoration systems did not completely prevent leakage either at the incisal or the cervical margins. Therefore the use of an enamel-dentin bonding system in combination with the proprietary compomer is recommended.
authors.affiliation: University of Siena, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Ferrari
authors.forename: A
authors.initials: A
authors.lastname: Vichi
authors.forename: F
authors.initials: F
authors.lastname: Mannocci
authors.forename: C L
authors.initials: CL
authors.lastname: Davidson
mesh_terms: D000134:Acid Etching, Dental; D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate; D020770:Compomers; D003188:Composite Resins; D003763:Dental Leakage / Q000517:prevention & control*; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods*; D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements; D006801:Humans; D008689:Methacrylates; D008875:Middle Aged; D010756:Phosphoric Acids; D011109:Polymethacrylic Acids; D019279:Resin Cements; D017640:Silicates; D018709:Statistics, Nonparametric; D019237:Tooth Cervix
chemical_list: C105428:Compoglass; D020770:Compomers; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C088486:Dyract; D005899:Glass Ionomer Cements; D008689:Methacrylates; D010756:Phosphoric Acids; D011109:Polymethacrylic Acids; C103500:Prime & Bond; D019279:Resin Cements; D017640:Silicates; C078484:Syntac dentine adhesive; D017438:Bisphenol A-Glycidyl Methacrylate; C030242:phosphoric acid