By Raymond Nagle and Victor Sears

ISBN-10: 1903561205

ISBN-13: 9781903561201

Dental, Dentures, scientific

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For example, to achieve the appearance that a patient desires might involve positioning the teeth outside the neutral zone, so compromising security. Alternatively, the base extension which provides optimum security may involve interference with muscle function and cause pain. We can only try to recognise any likely incompatibility between our ability and the patient’s expectations before we start treatment and take steps to inform the patient of the necessary compromises before completion. Again communication skills are at a premium in explaining this dilemma.

At rest, retention of a denture is augmented by the nature of saliva which at low shear rates is nonNewtonian in character, being thixotropic, and forming a weak gel as a consequence of the proteins dissolved in it. Retention of a denture is said to be supplemented by capillarity. Then, if a meniscus is formed at the periphery of the discs (dentures) the pressure within the film is less than that outside the film. The difference is given by the Laplace formula: p1 - p2 = σ(1/r1+1/r2) Where p1 and p2 = the pressures on the concave and convex sides respectively, r1 = one principal radius of curvature, r2 = the other principal radius of curvature, and σ = the surface tension of the liquid.

The difference is given by the Laplace formula: p1 - p2 = σ(1/r1+1/r2) Where p1 and p2 = the pressures on the concave and convex sides respectively, r1 = one principal radius of curvature, r2 = the other principal radius of curvature, and σ = the surface tension of the liquid. This can simplified to: p = 2T/h Where p = the reduction in pressure, T = the surface tension of saliva, and h = the distance between the denture and its supporting tissues. Although of interest, the effect of surface tension is of less certain significance.

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