Effect of soft liner-denture base thickness on load transmitted to the underlying mucosa. a three dimensional finite element analysis

Abstract EN

Background : In this study was designed to investigate the effect of thickness of different soft denture liner materials on load transmission to the underlining with in fesses on modulus of elasticity and poison's ratio.

Materials and methods : Six models of dental stone cast made , soft denture liner represented by a biostar thermoplastic sheet of different thickness (1, 2, and 3mm) and the denture base thickness was represented by either single layer or double layer of sheet wax , sheet wax converted to acrylic resin by the conventional method of curing (short curing cycle used).

The models was subdivided into six groups of combination thickness of soft denture liner and denture base made from acrylic resin with the fixation of mucosal thickness to 1.5 mm for all models .

The models were sectioned at molar region to apply load of 60 N, models drawn by AutoCAD 2006 and export as SAT type of file to ANSYS 5.4 program and Von-mises equivalent stresses collected at the mucosal–soft denture liner interface and compared.

Results : Analysis of the data done by the application of ANOVA Table with LSD multiple comparisons.

The result revealed that 1mm and 2mm thickness of soft denture liner with the fixation of denture base thickness to 3mm and when the elastic modulus of soft denture liner the same as that of mucosa, minimal stresses reach to the mucosal-soft denture liner interface.

Conclusion : 3 mm thickness of denture base material with 1mm and 2mm of soft denture liner produced the least amount of stress transmitted to the underlining mucosa when the modulus of elasticity match that of mucosa.