INTERNATIONAL JOURNAL OF ORAL-MEDICAL SCIENCES

Vol. 7 No. 1      September - 2008

ISSN: 1347-9733      UBIC: 136-M

Abstract

The present study attempts to evaluate the flexural properties of a denture base material relined with three different soft lining materials and investigate the effects of the thickness of the soft lining materials on the flexural properties of the relined denture base materials. Three commercially available soft lining materials (GC Reline Soft, S; GC Reline Extra Soft, ES; and GC Reline Ultra Soft, US) were evaluated. Acrylic resin (GC Acron) was used as the denture base material. The relined denture base specimens were prepared with four different thickness ratios of the soft lining material (mm)/denture base material (mm): 0.5/2.5, 1/2, 1.5/1.5, and 2/1. Thus, the thickness ratios were set to 0.2, 0.5, 1, and 2. The flexural strengths and moduli of the relined denture base specimens were obtained from the three-point bending test. As a result, the flexural strengths and moduli of the relined denture base specimens tended to decrease in the order of US, ES, an S. For all relined denture base specimens, flexural strength and modulus decreased with increasing thickness ratio. The predicted values obtained by the Euler-Bernoulli composite beam theory showed that the normalized bending rigidity decreased with increasing thickness and elastic modulus ratio of the soft lining material/denture base material, in agreement with the experimental results of the three-point bending test. It was concluded that the flexural properties of the relined denture bases depend on the soft lining material properties such as the lining thickness and lining material type. Keywords: denture base material, soft lining material, flexural properties, Euler- Bernoulli composite beam theory.

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