title: Adhesive retention of experimental fiber-reinforced composite, orthodontic acrylic resin, and aliphatic urethane acrylate to silicone elastomer for maxillofacial prostheses.
abstract: BACKGROUND
  A key factor of an implant-retained facial prosthesis is the success of the bonding between the substructure and the silicone elastomer. Little has been reported on the bonding of fiber reinforced composite (FRC) to silicone elastomers. Experimental FRC could be a solution for facial prostheses supported by light-activated aliphatic urethane acrylate, orthodontic acrylic resin, or commercially available FRCs.
  
  
  OBJECTIVE
  The purpose of this study was to evaluate the bonding of the experimental FRC, orthodontic acrylic resin, and light-activated aliphatic urethane acrylate to a commercially available high-temperature vulcanizing silicone elastomer.
  
  
  METHODS
  Shear and 180-degree peel bond strengths of 3 different substructures (experimental FRC, orthodontic acrylic resin, light-activated aliphatic urethane acrylate) (n=15) to a high-temperature vulcanizing maxillofacial silicone elastomer (M511) with a primer (G611) were assessed after 200 hours of accelerated artificial light-aging. The specimens were tested in a universal testing machine at a cross-head speed of 10 mm/min. Data were collected and statistically analyzed by 1-way ANOVA, followed by the Bonferroni correction and the Dunnett post hoc test (α=.05). Modes of failure were visually determined and categorized as adhesive, cohesive, or mixed and were statistically analyzed with the chi-squared goodness-of-fit test (α=.05).
  
  
  RESULTS
  As the mean shear bond strength values were evaluated statistically, no difference was found among the experimental FRC, aliphatic urethane acrylate, and orthodontic acrylic resin subgroups (P>.05). The mean peel bond strengths of experimental fiber reinforced composite and aliphatic urethane acrylate were not found to be statistically different (P>.05). The mean value of the orthodontic acrylic resin subgroup peel bond strength was found to be statistically lower (P<.05). Shear test failure types were found to be statistically different (P<.05), whereas 180-degree peel test failure types were not found to be statistically significant (P>.05). Shear forces predominantly exhibited cohesive failure (64.4%), whereas peel forces predominantly exhibited adhesive failure (93.3%).
  
  
  CONCLUSIONS
  The mean shear bond strengths of the experimental FRC and aliphatic urethane acrylate groups were not found to be statistically different (P>.05). The mean value of the 180-degree peel strength of the orthodontic acrylic resin group was found to be lower (P<.05).
authors: Resident, Department of Prosthodontics, Faculty of Dentistry, University of Ege, Izmir, Turkey. Electronic address: dtyim@windowslive.com.
authors: Begüm Yerci
authors: BY
authors: Kosor
authors: Professor, Department of Prosthodontics, Faculty of Dentistry, University of Ege, Izmir, Turkey.
authors: Celal
authors: C
authors: Artunç
authors: Resident, Department of Prosthodontics, Faculty of Dentistry, University of Ege, Izmir, Turkey.
authors: Heval
authors: H
authors: Şahan
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000268:Adhesiveness; D001672:Biocompatible Materials / Q000737:chemistry*; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D005898:Glass / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008447:Maxillofacial Prosthesis; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D019904:Polymethyl Methacrylate / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry*; D060489:Prosthesis Retention; D033081:Shear Strength; D012821:Silanes / Q000737:chemistry; D012826:Silicone Elastomers / Q000737:chemistry*; D013314:Stress, Mechanical; D013472:Sunlight; D013997:Time Factors
chemical_list: D000180:Acrylic Resins; D001672:Biocompatible Materials; D003188:Composite Resins; D011109:Polymethacrylic Acids; D011140:Polyurethanes; D012821:Silanes; D012826:Silicone Elastomers; C009753:fiberglass; C050845:urethane acrylate; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; D019904:Polymethyl Methacrylate