title: Analysis of the diametral compressive bond strength between composite resin and amalgam in different stages of oxidation.
abstract: OBJECTIVE
  Amalcomp is a technique that combines composite resin to amalgam in restorative procedures to improve esthetics and minimize the negative effects of polymerization on dental tissues. The objective of this in vitro study was to measure the diametral compressive bond strength between Fill Magic composite (Vigodent) versus Permite (DFL) or Velvalloy (SS White) amalgams in different oxidation stages.
  
  
  METHODS
  Twenty-four cylinders of each amalgam brand were fabricated using a Teflon matrix and divided into 3 groups according to the immersion period in artificial saliva for oxidation: A (1 day), B (7 days) and C (30 days). After immersion, the amalgam cylinders were bonded to the composite specimens using the Scotch Bond Multi Use Plus (3M) bonding system. Diametral compression assays were then carried out in an EMIC-MEM 2000 universal testing machine set to 0.5 mm/min. Statistical analysis was performed using ANOVA and Tukey's test.
  
  
  RESULTS
  The mean recorded strength (MPa) for each oxidation group was: A=9.71, B=8.21 and C=6.98 (A>B = C; P<0.01). Permite (7.24) provided significantly less adhesion to the composite than Velvalloy (9.36; P<0.05). There was no interaction between the factors alloy, resin and time.
  
  
  CONCLUSIONS
  Under the conditions of this study, the less oxidized amalgam showed the greatest diametral compressive strength values.
authors: Dental Materials Unit, Ribeirão Preto College of Dentistry, University of São Paulo, Ribeirão Preto, SP, Brazil.
authors: A B E
authors: AB
authors: Benitez Catirse
authors: V
authors: V
authors: Oliveira Pagnano
authors: A S
authors: AS
authors: Da Silva Mello
authors: C
authors: C
authors: Do Nascimento
authors: J P
authors: JP
authors: Mardegan Issa
mesh_terms: D003188:Composite Resins / Q000737:chemistry*; D019245:Compressive Strength; D003300:Copper / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry*; D003723:Dental Amalgam / Q000737:chemistry*; D001840:Dental Bonding; D008422:Materials Testing; D010084:Oxidation-Reduction; D012464:Saliva, Artificial / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D013997:Time Factors
chemical_list: D003188:Composite Resins; D003722:Dental Alloys; C481898:Fill Magic; D012464:Saliva, Artificial; C075189:Velvalloy; D012834:Silver; D003300:Copper; D003723:Dental Amalgam; C092423:Permite C