title: Bond strength of a resin composite to a polyacid-modified resin composite under different conditions.
abstract: OBJECTIVE
  The aim of this in vitro study was to evaluate the tensile bond strength values between polyacid-modified resin composite ("compomer") and resin composite materials under different conditions.
  
  
  METHODS
  There were five experimental groups in the study. In group A, resin composite was placed directly on polyacid-modified resin composite surfaces. In group B, bonding agent was applied to polyacid-modified resin composite surfaces and then resin composite was placed on the compomer. In group C, compomer specimens were stored for 1 week and then resin composite was placed directly on these aged compomers. In group D, compomer specimens were again stored for 1 week, and then the bonding agent and resin composite were applied to the compomer surfaces. In group E, the surfaces of aged (1 week) compomers were roughened before the bonding agent was applied and the resin composite was placed on the prepared surfaces. A statistical analysis of the results was made with the Kruskal-Wallis test method.
  
  
  RESULTS
  The mean tensile strength values of the groups were as follows: group A = 12.84 MPa; group B = 15.03 MPa; group C = 10.60 MPa; group D = 11.56 MPa; group E = 24.87 MPa. There were statistically significant differences between groups E and A; groups E and C; groups E and D; and groups C and B.
  
  
  CONCLUSIONS
  Mechanical roughening of a polyacid-modified resin composite surface was found to be the most effective factor in increasing the tensile bond strength between an aged compomer and a resin composite.
authors.affiliation: Department of Conservative Dentistry, Faculty of Dentistry, University of Istanbul, Capa, Istanbul, Turkey. benderli@istanbul.edu.tr
authors.forename: Yasemin Gökçe
authors.initials: YG
authors.lastname: Benderli
authors.forename: Fatma
authors.initials: F
authors.lastname: Koray
authors.forename: Nurten
authors.initials: N
authors.lastname: Turan
mesh_terms: D020770:Compomers / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003799:Dental Stress Analysis / Q000295:instrumentation; D005898:Glass / Q000737:chemistry; D006801:Humans; D008298:Maleates / Q000737:chemistry; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D017640:Silicates / Q000737:chemistry; D018709:Statistics, Nonparametric; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: C088247:ART Bond; C069351:Brilliant Direct-Inlay resin; D020770:Compomers; D003188:Composite Resins; C088486:Dyract; D008298:Maleates; D008689:Methacrylates; D019279:Resin Cements; D017640:Silicates; D014867:Water