Comparison of bond strengths of three denture base resins to treated nickel-chromium-beryllium alloy.
OBJECTIVE
In-vitro bond strengths of 3 denture base resins (Trutone, Lucitone 199, and Triad) to a nickel-chromium-beryllium removable partial denture alloy (Ticonium) were tested with 3 surface pretreatments: sandblast, acid etch, and Rocatec (silica blasting), with or without primers (Dentsply, CR inlay cement, and Super Bond).


METHODS
Lucitone 199 denture base resin bonded to the nonprimed sandblasted alloy specimen served as the control group. Alloy specimens were prepared, surface treated, and primed or not primed with primer. The treated specimens were then packed and processed with the denture base resin. Bonded specimens were stored in the distilled water at 37 degrees C for 24 hours, and then debonded in tension. The force at which the bond failed was noted, and bond strength was calculated in megapascals (MPa). Five replications for each condition (180 specimens total) were tested.


RESULTS
Significant differences in bond strength were observed with primer, the most important factor, followed by pretreatment and denture base resin. Without primer for all 3 denture base resins, the Met-Etch and Rocatec treated group showed significantly higher bond strengths than the sandblasted groups. For Trutone denture base resin, nonprimed treated groups produced significantly higher bond strength than those for the other 2 denture base resin, nonprimed treated groups produced significantly higher bond strength than those for the other 2 denture base resins. The control group had zero bond strength. For Dentsply primer, the Rocatec treated group bonded to Lucitone 199 resin produced the highest bond strength value (14.8 +/- 1.8 MPa). For CR inlay cement, the Met-Etch and Rocatec treated groups for Lucitone denture base resin demonstrated the highest bond strength (19.3 +/- 4.8 MPa, and 19.3 +/- 1.8 MPa, respectively). For super Bond primer, the Met-Etch treated group for Trutone resin demonstrated the highest bond strength (19.8 +/- 6.2 MPa).


CONCLUSIONS
Without primer, the control had the lowest bond strength (0 MPa), and the Trutone groups showed the highest bond strength (11.7 +/- 4.1 MPa). Met-Etch and Rocatec treated groups produced higher bond strengths than the sandblasted groups. The primed specimens demonstrated significantly higher bond strengths than nonprimed specimens, except for Trutone resin, for which primed specimens produced lower bond strengths than the nonprimed specimens.
University of Washington, School of Dentistry, Seattle, USA.
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NaBadalung
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Powers
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Connelly
D000134:Acid Etching, Dental; D000180:Acrylic Resins; D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate; D001843:Bone Cements; D001896:Boron Compounds; D002858:Chromium Alloys; D001840:Dental Bonding / Q000379:methods*; D003738:Dental Cements; D003819:Denture Bases; D003832:Denture, Partial, Removable; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates; D008768:Methylmethacrylates; D019904:Polymethyl Methacrylate; D013499:Surface Properties; D013718:Tensile Strength
D000180:Acrylic Resins; D001843:Bone Cements; D001896:Boron Compounds; D002858:Chromium Alloys; D003738:Dental Cements; D008689:Methacrylates; D008768:Methylmethacrylates; C115350:Trutone; C060386:Triad resin; C087243:CR Inlay Cement; D017438:Bisphenol A-Glycidyl Methacrylate; C035124:CMW cement; C040291:Lucitone; C039459:ticonium; D019904:Polymethyl Methacrylate; C049495:Super-bond