title: Evaluation of the cohesive strength between resin composite and light-curing characterizing materials.
abstract: OBJECTIVE
  To evaluate the cohesive strength between composite and different light-curing characterizing materials (LCCM), which were prepared using the intrinsic technique.
  
  
  METHODS
  One hundred composite specimens were made by using a prefabricated Teflon device, and a layer of LCCM was applied at the interface. The specimens were divided into 5 groups (n = 20): group 1 (control), no LCCM was used; group 2: application of White Kolor Plus Pigment (Kerr) LCCM; group 3: White Tetric Color Pigment (Ivoclar/Vivadent) LCCM; group 4: Brown Kolor Plus Pigment (Kerr) LCCM; group 5: Black Tetric Color Pigment (Ivoclar/Vivadent) LCCM. All materials were used according to the manufacturers' instructions. Specimens were submitted to a tensile test in a universal testing machine (EMIC DL-200MF) to evaluate the cohesive strength at the composite interface. Data were subjected to one-way ANOVA and Tukey's test (α = 5%).
  
  
  RESULTS
  ANOVA showed a p-value = 0.0001, indicating that there were significant differences among the groups. The mean values in MPa (± standard deviation) obtained for the groups were: G1: 28.5 (± 2.74)a; G2: 23.5 (± 2.47)b; G3: 20.3 (± 2.49)b; G4: 10.5 (± 2.40)c; G5: 9.66 (± 3.06)c. The groups with the same letters presented no significant differences. The control group presented statistically significantly higher cohesive strengths when compared to the other groups. The groups in which Brown Kolor Plus Pigment and Black Tetric Color Pigment LCCM were used showed significantly lower cohesive strengths when compared to the groups in which White Kolor Plus Pigment and White Tetric Color Pigment LCMM were used.
  
  
  CONCLUSIONS
  The use of LCCM produced with the intrinsic technique reduced the cohesive strength of composite.
authors.affiliation: Department Restorative Dentistry, São José dos Campos School of Dentistry, UNESP, São Paulo State University, Brazil. cesar@fosjc.unesp.br
authors.forename: César Rogério
authors.initials: CR
authors.lastname: Pucci
authors.forename: Daphne Câmara
authors.initials: DC
authors.lastname: Barcellos
authors.forename: Milena Traversa
authors.initials: MT
authors.lastname: Palazon
authors.forename: Alessandra Bühler
authors.initials: AB
authors.lastname: Borges
authors.forename: Melissa Aline
authors.initials: MA
authors.lastname: da Silva
authors.forename: Sergio Eduardo
authors.initials: SE
authors.lastname: de Paiva Gonçalves
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D004396:Coloring Agents / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D006801:Humans; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength
chemical_list: D004396:Coloring Agents; D003188:Composite Resins; D003764:Dental Materials; D008689:Methacrylates; D011109:Polymethacrylic Acids; D011140:Polyurethanes; C533204:filtek Z350; C029824:urethane dimethacrylate luting resin; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate