Effect of maleic anhydride pretreatment on tensile bond strength of a silicone soft liner to a denture base polymer.
OBJECTIVE
To determine the effect of resin surface treatment with dissolved maleic anhydride in butanone added into primer on the tensile bond strength between an acrylic denture base resin and a silicone soft liner.


METHODS
To test tensile bond strength, standard dumbbell-shaped acrylic specimens were prepared. Five experimental groups, including the control, were tested (n = 5). Maleic anhydride solutions prepared in butanone at concentrations of 1%, 5%, 10% or 20% were then mixed with 1 ml of Primo adhesive and the mixtures were applied onto the resin bonding surfaces. Silicone liner material was applied to resin surfaces in the conventional manner. Tensile bond strength of the specimens was measured in a universal testing machine. Fractured surfaces were observed under the scanning electron microscope, and resulting chemical changes with the solutions used were analyzed spectroscopically.


RESULTS
The highest bond strength value was obtained for the group treated with 5% maleic anhydride (2.53 ± 0.48 MPa); the lowest value was for the group treated with 20% maleic anhydride (1.59 ± 0.29 MPa). Mixed failure was the dominant type seen in the experimental groups. Spectroscopic analysis showed the interaction of the anhydride carbonyl groups with the Primo primer.


CONCLUSIONS
The treatment of resin surfaces with maleic anhydride added to Primo adhesive effectively increased bond strength between silicone soft liner and denture base resin.
Department of Prosthodontics, Cum huriyet University, Sivas, Turkey.
Hakan
H
Demir
Koray
K
Soygun
Arife
A
Dogan
Selda
S
Keskin
Orhan Murat
OM
Dogan
Giray
G
Bolayir
D002074:Butanones / Q000737:chemistry; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D003819:Denture Bases; D003822:Denture Liners; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D006801:Humans; D008299:Maleic Anhydrides / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D012826:Silicone Elastomers / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength
D002074:Butanones; D003738:Dental Cements; D003764:Dental Materials; D004129:Dimethylpolysiloxanes; C020964:MDX 4-4210; D008299:Maleic Anhydrides; D012826:Silicone Elastomers; D012997:Solvents; D019904:Polymethyl Methacrylate