Removable partial denture and complete denture often require denture base relines to improve the fitness aginst tissue-bearing mucosa because of the gradual change in edentulous ridge contour and resorption of underlying bony *structure. Self-curing hard relining resin offer the immediate and relatively inexpensive means directly to recondition denture base surface. But weak bond between denture. base resin and reline material could harbor bacteria, promote staining, or result in complete separation of the two materials. The purpose of this study was to estimate the bond strength between Vertex denture base resin and 3 kind of self-curing hard reline materials(TokusoRebase, Mild Rebaron, DuraBase).
Den´-:re base resin beams(3.0 x 15.0 x 60.0 mm) were made with Vertex resin. After that, the section was removed in legth of 10mm from the center of each specimen. The samples were replaced in the molds and the space of 10mm sections were packed with reline materials. This study was conducted to estimate the bond stregth of self-curing hard reline materials to heat-curing denture base resin by use of UTM(Universal Testing Machine).
The obtained results were as follows;
1) The bonding strength of TokusoRebase and Mild Rebaron to Vertex denture base resin was higher than that of DuraBase.
2) There was no effect of thermocycling on the 3-point tmasverse flexural strength of all self-curing hard reline materials.
3) The failure modes of TokusoRebase, Mild Rebaron, were mainly cohesive failure, but Dura Base were mainly showed adhesive failure.
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