Comparison of bond strengths of denture base resins to nickel-chromium-beryllium removable partial denture alloy.
OBJECTIVE
In vitro bond strengths of a traditional denture base resin (Lucitone 199) and three adhesive denture base resins (Meta-Dent, Meta-Fast with liner, and Meta-Fast without liner) to treated nickel-chromium-beryllium (Ni-Cr-Be) partial denture alloy were tested with four alloy surface pretreatments (sandblast, Met-etch, Rocatec with silane, and Rocatec without silane), with or without primer (Dentsply). The Lucitone 199 resin bonded to the nonprimed sandblasted group was the control group. The hypothesis was the use of alloy pretreatments and/or primer does not improve the bond strength of denture base resins to sandblasted Ni-Cr-Be partial denture alloy.


METHODS
Primed and nonprimed bonded specimens were prepared and finished, stored in 37 degrees C distilled water for 24 hours, then debonded in tension on a testing machine. The bond strength was calculated in megapascals (MPa). Five specimens were prepared and tested for each experimental condition, both with and without primer, for a total of 160 specimens.


RESULTS
For three-way analysis of variance, the main effects of resins and treatment were statistically significant (p < 0.05), but the main effect of primer was not statistically significantly (p > 0.05). Without primer, the control group had the lowest bond strength (0 MPa). The three adhesive resin groups produced significantly higher bond strengths than the Lucitone resin groups. For the treated groups, nearly all sandblasted groups produced significantly lower bond strength than the other three treated groups. Meta-Dent to Met-etch treated group had the highest bond strength (23.9 MPa). With primer, the bond strengths of the Lucitone resin groups were significantly higher than the nonprimed groups, and the Lucitone resin-primed Rocatec treated group had the highest bond strength (14.8 MPa). For the three adhesive denture base resins, nearly all primed treated groups had significantly lower bond strengths than nonprimed groups.


CONCLUSIONS
Without primer, the Lucitone resin-sandblast treated group (control) had the lowest bond strength (0 MPa). The Meta-Dent denture base resin with the Met-etch treated group had the highest bond strength (23.9 MPa). With primer, the Lucitone resin-primed Rocatec-silane treated group had the highest bond strength (14.8 MPa). For the adhesive denture base resins, nearly all bond strengths of the primed treated groups were significantly lower than the values of the nonprimed groups.
NaBadalung
D P
DP
University of Washington School of Dentistry, Seattle, USA.
Powers
J M
JM
Connelly
M E
ME
D000134:Acid Etching, Dental; D000180:Acrylic Resins / Q000737:chemistry*; D000269:Adhesives / Q000737:chemistry; D000704:Analysis of Variance; D001843:Bone Cements; D002858:Chromium Alloys / Q000737:chemistry*; D003722:Dental Alloys / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods; D003738:Dental Cements / Q000737:chemistry; D003775:Dental Polishing; D003799:Dental Stress Analysis; D003819:Denture Bases; D003832:Denture, Partial, Removable; D008422:Materials Testing; D019904:Polymethyl Methacrylate; D019279:Resin Cements / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties
D000180:Acrylic Resins; D000269:Adhesives; D001843:Bone Cements; D002858:Chromium Alloys; D003722:Dental Alloys; D003738:Dental Cements; D019279:Resin Cements; C076811:Rocatec; D012821:Silanes; C035124:CMW cement; C040291:Lucitone; C039459:ticonium; C031172:4-META resin; D019904:Polymethyl Methacrylate