Viscosity of saliva in relation to denture retention. Part 2. Viscosity of mediating fluid in relation to retention of denture

Abstract

The denture retention is affected with four groups of factors: physical, physiolosical, psychological and mechanical factors. The most important factor is the effect of saliva in the physical factors. A new measuring divice of the denture retention was fabricated for the purpose of exploring the influence of the viscosity of saliva. Six subjects took part in this study and they were classified into three groups according to their palatine shapes: deep, normal and shallow one. Palatal plates were fabricated from these subjects using self-curing resin. Glycerinum solutions diluted to five concentrations and mixed saliva samples were used as the mediating fluid for measuring the retention of the palatal plates. The viscosity of the mediating fluid was measured with a quet type rotation viscometer (Low Shear 30, Contraves).The denture retention must not be discussed in view of the surface area of the denture base, but in view of the projected area of the denture base. The denture retention stands in direct proportion to the projected area of the denture base. It also stands in direct proportion to the viscosity of glycerinum solution and the viscosity of saliva.