Shear Bond Strength of Hard Chairside Reline Material to Denture Base Material

Abstract

Aims: To evaluate the effect of different surface treatment on shear bond strength (SBS) of a hard chairsidereline material to denture base resin. Materials and methods: Cylindric columns of denture reline materialwere bonded to columns of denture base resin. Fifty specimens were prepared and divided into 5 groupsaccording to the surface treatment used. Group I: Untreated; group II: Wetting with denture base resin monomer(180 s); group III: Wetting with Kooliner monomer (180 s); group IV: Wetting with acetone (10 s);and group V: Wetting with chloroform (5 s). The strength at which the bond failed under shear was recordedand fracture site on the specimens was tested by visual examination and reflecting light microscope. Thedata were statistically analyzed using one–way analysis of variance (ANOVA), Duncan’s Multiple RangeTest and Chi–square test. Results: All surface treatments caused significantly increase (p < 0.0001) in SBS.Chloroform caused significantly higher SBS, and untreated group showed significantly lower SBS. Mixedfailure mode was predominant in groups with higher SBS, while adhesive failure mode was predominant ingroups with lower SBS. Conclusions: All surface treatments (Monomer, Kooliner monomer, acetone, chloroform)achieved significantly higher SBS.

Keywords

• shear strength
• reline resin
• denture base resin
• bond strength