title: Bond Strength of Self-adhesive Resin Cement to Different Root Perforation Materials.
abstract: BACKGROUND
  Different materials have been used for intervening in root perforations. These materials are often in contact with resin cements used for cementation of intraradicular retainers. The aim of this study was to evaluate the bond strength of self-adhesive resin cement to different materials used to treat root perforations (mineral trioxide aggregate [MTA], Portland cement [PORT], and glass ionomer cement [GIC]).
  
  
  METHODS
  Four discs (10 × 1 mm) of each material (the MTA, PORT, and GIC groups) were embedded into polyvinyl chloride tubes using acrylic resin, ground, and polished until a flat surface was exposed. Afterward, 4 silicone molds were used to prepare self-adhesive resin cement cylinders (0.7 × 1 mm) on each disc surface (N = 16). The specimens were stored in deionized water at 37°C for 24 hours and subjected to a microshear test. Then, the failure modes were examined. Data were submitted to statistical analysis (α = 0.05).
  
  
  RESULTS
  The MTA and GIC groups showed significantly higher microshear bond strength values (3.36 ± 1.56 and 2.90 ± 1.49 MPa, respectively) than the PORT group (1.39 ± 0.77 MPa) (P < .05). Only adhesive failure modes were observed.
  
  
  CONCLUSIONS
  When PORT was used as a root perforation material, GIC should be used as a base over it to improve shear bond strength with self-adhesive resin cement.
authors: Department of Dentistry, Positivo University, Curitiba, Paraná, Brazil.
authors: Stephanie
authors: S
authors: Lemos Martins Sicuro
authors: Department of Dentistry, Positivo University, Curitiba, Paraná, Brazil. Electronic address: marilisagabardo@e-odonto.com.
authors: Marilisa Carneiro Leão
authors: MC
authors: Gabardo
authors: Department of Dentistry, Positivo University, Curitiba, Paraná, Brazil.
authors: Carla
authors: C
authors: Castiglia Gonzaga
authors: Department of Dentistry, Positivo University, Curitiba, Paraná, Brazil.
authors: Nathaly
authors: N
authors: Dias Morais
authors: Department of Dentistry, Positivo University, Curitiba, Paraná, Brazil.
authors: Flares
authors: F
authors: Baratto-Filho
authors: Department of Dentistry, Positivo University, Curitiba, Paraná, Brazil.
authors: Gisele Maria
authors: GM
authors: Correr Nolasco
authors: Department of Dentistry, Positivo University, Curitiba, Paraná, Brazil.
authors: Denise Piotto
authors: DP
authors: Leonardi
mesh_terms: D000134:Acid Etching, Dental; D000180:Acrylic Resins / Q000737:chemistry; D017607:Aluminum Compounds / Q000737:chemistry; D017610:Calcium Compounds / Q000737:chemistry; D002484:Cementation; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003764:Dental Materials / Q000737:chemistry; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D004338:Drug Combinations; D005899:Glass Ionomer Cements / Q000737:chemistry; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D010087:Oxides / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D017640:Silicates / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D014092:Tooth Root / Q000187:drug effects*; D014867:Water / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D017607:Aluminum Compounds; D017610:Calcium Compounds; D003188:Composite Resins; D003764:Dental Materials; D017220:Dentin-Bonding Agents; D004338:Drug Combinations; D005899:Glass Ionomer Cements; D008689:Methacrylates; D010087:Oxides; D019279:Resin Cements; D017640:Silicates; C086631:mineral trioxide aggregate; D014867:Water; C095998:Adhesive cement
keywords: Bond strength; Portland cement; glass ionomer cement; mineral trioxide aggregate; resin cement