The effect of surface treatment on tensile bond strength between soft liner and acrylic denture base and the effect of Pepsi solution on this bond with and without surface treatment

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05/5/2014 11:16 AM

The effect of surface treatment on tensile bond strength between soft liner and acrylic denture base and the effect of Pepsi solution on this bond with and without surface treatment



Rola W. Abdul-Razaq B.D.S., M.Sc.(1)
Noor F. Abdul-Hadi B.D.S., M.Sc. (1)
Hussam M. Saied B.D.S., M.Sc. (1)


ABSTRACT

Background: One of the major serious problems with the soft denture liners is adhesion failure between the soft liner material and denture base. Bond failures create a potential surface for bacterial growth, plaque accumulation, and calculus formation. The purpose of this study was to examine the effect of surface treatment of acrylic denture base material (sandblast, retentive grooves) on the tensile bond strength between soft liner and acrylic denture base and to investigate the effect of Pepsi solution on tensile bond strength with and without surface treatment of the acrylic denture base material.
Materials and methods: Sixty heat cure acrylic resin specimens consisting of two blocks measuring (10*10*30mm) were prepared and divided into 3 major groups. Group (P) had no surface treatment group( S) the acrylic surface were treated with sandblast group(G) the acrylic surface were treated with retentive grooves. Each group contains 20 specimens, 10 specimens stored in distilled water and 10 stored in Pepsi for 24 hours before testing. After acrylic specimens were prepared and treated Vertex base soft liner was applied in the space between the two blocks of acrylic. A micro computer controlled electronic universal testing machine was used to measure the tensile bond strength after storage in distilled water and Pepsi for 24 hours.
Results: the results revealed that there was no significant difference in tensile bond strength mean values for all test specimens (Polished,Sandblasted,Grooved)stored in water while there was highly significant difference in tensile bond strength mean values for the test specimens stored in Pepsi. In addition there was a highly significant difference in tensile bond strength values between the tested specimens which stored in water when compared with those which stored in Pepsi.
Conclusion: surface treatment by sandblasting and retentive grooves had no effect on tensile bond strength between soft liner and acrylic denture base for the specimens stored in water while for the specimens stored in Pepsi the tensile bond strength had decreased for the sandblasted and grooved specimens.
Key words: surface treatment, tensile bond strength, sandblast, retentive grooves, soft liner, acrylic- resin.




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