The purpose of this study was to evaluate the effect of proportional thickness of various reline materials on the transverse strength of denture base. The denture base resin used in this study was Vertex RS(Dentimex Zeist., Holland). The reline resins used were Tokuso rebase normal set (Tokuyama Corp., Japan), Rebaron´-´´(GC Corp., Japan), Koolinerm(GC INC., U.S.A), New trulinerm (Barry J. Bosworth Co., U.S.A). The bulk specimens with 2.5 mm thickness of denture base were prepared as the control group. Group 1 was fabricated with 2.0 mm thickness of denture base and 0.5 mm reline material, group 2 wide 1.5:1.0 mm, group 3 with 1.0:1.5 mm, group 4 with 0.5:2.0 mm composition. Measurements of transverse strength were taken for each specimens.
The results were as follows:
1. Regardless of the reline resin type, the transverse strength of denture base was decreased after reline procedure.
2. The transverse strength according to the reline resin type was decreased in the following order Rebaron, Tokuso rebase, Kooliner, and then New truliner and there was a significant difference among the reline materials(P<0.05).
3. The strength of the relined denture base generally decreased as the proportional thickness of the denture reline material increased.
These results suggest that increasing the proportional thickness of the reline material progressively decreased the strength of the relined denture base. Thus, the denture base should not be unnecessarily altered during the reline procedure.
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