title: Original and repair bond strength of fiber-reinforced composites in vitro.
abstract: OBJECTIVE
  A great benefit of FRC technology is that, in case of minor failure events, restorations can be repaired or reinserted. However, various FRC materials are available, that differ in matrix composition and fiber pre-treatment. The aim of this investigation was, therefore, to evaluate original and repair bond strength of FRC materials.
  
  
  METHODS
  Five fully pre-impregnated, unidirectional FRCs were selected, one semi-interpenetrating polymer network FRC and four cross-linked-polymer FRCs. The primary endpoint was the evaluation of shear bond strength (SBS) between FRC and composite resin, which was performed by a universal testing machine. For each FRC specimens were divided into control (original SBS, resin to fresh FRC with oxygen inhibition layer (OIL), n=30) and test groups (repair SBS, resin to FRC after removal of OIL and adhesive infiltration, n=30).
  
  
  RESULTS
  The cross-linked-polymer FRC GrandTec(®) (12.4±5.4 MPa) yielded the highest control SBS, followed by the semi-interpenetrating polymer network FRC (everStick(®), 9.2±3.5 MPa). With everStick(®), repair led to a significant increase in the test SBS (14.6±5.8 MPa, p=0.01).
  
  
  CONCLUSIONS
  Control SBS was best with GrandTec(®) indicating that the material is superior in direct clinical application. Test SBS was significantly increased with everStick(®) which points at potential reparability and advantages in semi-direct or indirect fabrication of fiber-reinforced fixed partial dentures.
authors: Department of Conservative Dentistry, School of Dental Medicine, University Hospital Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany. Electronic address: cornelia.frese@med.uni-heidelberg.de.
authors: Cornelia
authors: C
authors: Frese
authors: Department of Conservative Dentistry, School of Dental Medicine, University Hospital Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany.
authors: Christian
authors: C
authors: Decker
authors: Department of Conservative Dentistry, School of Dental Medicine, University Hospital Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany.
authors: Johanna
authors: J
authors: Rebholz
authors: Institute of Medical Biometry and Informatics, Ruprecht Karls University, Im Neuenheimer Feld 305, 69120 Heidelberg, Germany.
authors: Kathrin
authors: K
authors: Stucke
authors: Department of Conservative Dentistry, School of Dental Medicine, University Hospital Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany.
authors: Hans Joerg
authors: HJ
authors: Staehle
authors: Department of Conservative Dentistry, School of Dental Medicine, University Hospital Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany.
authors: Diana
authors: D
authors: Wolff
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry; D003799:Dental Stress Analysis; D066298:In Vitro Techniques; D055115:Light-Curing of Dental Adhesives; D008689:Methacrylates / Q000737:chemistry*; D033081:Shear Strength
chemical_list: D003188:Composite Resins; D003764:Dental Materials; C000604629:Dentrapreg PFU; C000604626:GrandTec; D008689:Methacrylates; C000604628:TenderFibre; C496140:everStick; C113549:splint-It, FRC material; D017438:Bisphenol A-Glycidyl Methacrylate
keywords: Cross-linked polymer; Interdiffusion; Repair; Resin matrix; Semi-interpenetrating polymer network; Shear bond strength