Effect of thickness and recycling on transverse strength of relined acrylic resin denture base

Abstract EN

Aims of the study : The aims of this study are to evaluate the transverse strength of relined acrylic den-ture base (additional curing by water bath or microwave), and to evaluate the best thickness of relining material in relation to denture base.

Materials and Methods : Thirty five samples were prepared from Major heat cured resin in dimensions of 65 × 10 × 2.5 ± 0.03 mm (length, width and thickness) respective-ly, for the transverse strength test (ADA specification No.

12).

Three different ratios of relining material thickness to denture base were examined and two curing techniques (microwave curing cycle and the water bath curing cycle).

Statistical analysis of variance (ANOVA) and Duncan’s multiple range tests were used to compare the groups.

Results : There was no significant difference in the transverse strength between the different thicknesses of relining material in relation to denture base for both cur-ing methods .There was a significant difference in the transverse strength between the control group and the relined groups (microwave and water bath relining).

Conclusions : Different ratios of thickness of relining material in relation to denture base had no significant effect on the transverse strength of the relined denture base.

Relining the heat cure denture base material significantly decreases the transverse strength of the relined denture base.