title: Influence of the exposure of MTA with and without calcium chloride to phosphate-buffered saline on the push-out bond strength to dentine.
abstract: OBJECTIVE
  To analyse the influence of exposure of mineral trioxide aggregate (MTA) with and without calcium chloride (CaCl2 ) to phosphate-buffered saline (PBS) on the push-out bond strength, over different experimental periods.
  
  
  METHODS
  One hundred and twenty dentine discs with standardized cavities were filled with MTA with and without 10% CaCl2 . The specimens were randomly divided as follows (n = 30): (G1) MTA in contact with a moistened cotton pellet, (G2) MTA immersed in PBS, (G3) MTA + CaCl2 in contact with a moistened cotton pellet and (G4) MTA + CaCl2 immersed in PBS. The samples were stored for 3, 28 and 60 days. The bond strengths were measured with the Instron Testing machine. Data were analysed using the three-way anova and Tukey test (P < 0.05).
  
  
  RESULTS
  In general, the samples of MTA with and without CaCl2 , exposed to PBS, had higher bond strength values in all study periods (P < 0.05). Analysis of the influence of addition of CaCl2 to MTA (G1 × G3) evidenced significant differences in bond strength in the different periods (P < 0.05).
  
  
  CONCLUSIONS
  The exposure of MTA to PBS positively influenced the push-out bond strength, whereas the addition of CaCl2 had a negative influence.
authors.affiliation: School of Dentistry, Federal University of Santa Catarina, Florianópolis, Brazil.
authors.forename: J
authors.initials: J
authors.lastname: de Almeida
authors.forename: M C S
authors.initials: MC
authors.lastname: Felippe
authors.forename: E A
authors.initials: EA
authors.lastname: Bortoluzzi
authors.forename: C S
authors.initials: CS
authors.lastname: Teixeira
authors.forename: W T
authors.initials: WT
authors.lastname: Felippe
mesh_terms: D017607:Aluminum Compounds / Q000008:administration & dosage*; D002021:Buffers; D002122:Calcium Chloride / Q000008:administration & dosage*; D017610:Calcium Compounds / Q000008:administration & dosage*; D001840:Dental Bonding; D003804:Dentin; D004338:Drug Combinations; D006801:Humans; D066298:In Vitro Techniques; D010087:Oxides / Q000008:administration & dosage*; D010710:Phosphates / Q000737:chemistry*; D017640:Silicates / Q000008:administration & dosage*; D012965:Sodium Chloride / Q000737:chemistry*
chemical_list: D017607:Aluminum Compounds; D002021:Buffers; D017610:Calcium Compounds; D004338:Drug Combinations; D010087:Oxides; D010710:Phosphates; D017640:Silicates; C086631:mineral trioxide aggregate; D012965:Sodium Chloride; D002122:Calcium Chloride
keywords: bond strength; mineral trioxide aggregate; phosphate-buffered saline