title: Influence of electron beam irradiation on the alloy-to-resin bond strength.
abstract: The aim of this study was to investigate whether postcuring using electron beam irradiation had an effect on the bond strength of resin-to-base-metal after priming their surfaces using silicoating methods or functional monomers. Composite cylinders were bonded on a restricted area of 5 mm2 to flat rectangular titanium and cobalt-chromium specimens. Under investigation were the silicoating system Rocatec, the thiol-phosphate system Metal Primer II and the phosphate ester SR Link. Tensile strength and shear bond strength were determined for the three test groups in each case: (i) after 24 h, (ii) after electron beam irradiation (100 kGy), and (iii) after irradiation (100 kGy) + 12,000 cycles of thermal cycling (5 degrees /55 degrees C). The bond strength was highly affected by irradiation and the metal priming method used. However, the tribochemical silicoating method and phosphate-ester group showed no significant statistical change in bond strength. Only the thiol-phosphate system showed considerably higher tensile and shear bond strengths after irradiation. Thermal cycling did not deteriorate this bond and there was a tendency for higher bond strength on titanium. As a result it was determined that thiol-phosphate primers in combination with postcuring using electron beam irradiation can considerably improve the bond strength between resins and titanium or cobalt-chromium alloys.
authors.affiliation: Department of Prosthodontics, University of Regensburg, School of Dentistry, Regensburg, Germany. michael.behr@klinik.uni-regensburg.de
authors.forename: Michael
authors.initials: M
authors.lastname: Behr
authors.forename: Martin
authors.initials: M
authors.lastname: Rosentritt
authors.forename: Klaus
authors.initials: K
authors.lastname: Bettermann
authors.forename: Gerhard
authors.initials: G
authors.lastname: Handel
mesh_terms: D002858:Chromium Alloys / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry / Q000528:radiation effects*; D003722:Dental Alloys / Q000737:chemistry / Q000528:radiation effects*; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D004583:Electrons; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D010710:Phosphates / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D033081:Shear Strength; D012821:Silanes / Q000737:chemistry; D013438:Sulfhydryl Compounds / Q000737:chemistry; D013499:Surface Properties; D013718:Tensile Strength; D013997:Time Factors; D014025:Titanium / Q000737:chemistry
chemical_list: D002858:Chromium Alloys; D003188:Composite Resins; D003722:Dental Alloys; D003738:Dental Cements; D008689:Methacrylates; D010710:Phosphates; D019279:Resin Cements; C076811:Rocatec; D012821:Silanes; D013438:Sulfhydryl Compounds; C100646:Metal Primer; D014025:Titanium