The interaction of various liquids with long-term denture soft lining materials.

Objectives: To study the uptake of liquids, representative of those encountered orally, by long-term denture soft lining materials, and analyze the data in terms of appropriate theories.

Methods: Four proprietary and one experimental soft lining material were investigated, and the weight change presented as a function of time in both aqueous and organic fluids over the course of a year. A separate experiment determined the equilibrium swelling in ethanol of poly(ethyl methacrylate) and poly(methyl methacrylate).

In vitro colonization of an experimental silicone by Candida albicans.

Denture soft-lining materials are exposed to the oral cavity for long periods and are in continuous contact with saliva, subject to inhibition of liquid molecules, and susceptible to colonization by microorganisms. The opportunist yeast Candida albicans is of particular concern in this context, being associated with denture plaque and denture-related stomatitis. In this study, penetration of C.

Kinetics of fluoride release from glass components of glass ionomers.

Objectives: To compare the F release from glass ionomer glasses (GICs) into water changed periodically with release into an unchanged "sink" [Williams JA, Billington RW, Pearson GJ. The glass ionomer cement: the sources of soluble fluoride. Biomaterials 2002;23:2191-200].

Current clinical applications of photo-activated disinfection in restorative dentistry.

Unlabelled: The traditional treatment of dental caries has been limited to bulk removal of the diseased tissue. Recently, disinfection rather than the removal of all the carious tissue has been advocated with the aim of more effective and conservative treatment. In endodontics, prognosis is dependent on the complete disinfection of the root canal system.

Interoperator variability during polishing.

Objective: The object of this study was to establish the 3 variables used in polishing by measuring the range of loads, speeds, and times used by practitioners when finishing and polishing samples of amalgam, resin composite, and glass-ionomer cement. These parameters could then be used to establish clinically relevant values that might optimize clinical finishing techniques.

Methods And Materials: Samples of the 3 materials were attached to the load cell of a universal testing machine that was attached to an X-Y plotter.

Antibacterial action of photoactivated disinfection {PAD} used on endodontic bacteria in planktonic suspension and in artificial and human root canals.

Objectives: To measure antibacterial action of photoactivated disinfection (PAD) on endodontic bacteria in planktonic suspension and root canals.

Methods: Four bacteria, Fusobacterium nucleatum,Peptostreptococcus micros, Prevotella intermedia and Streptococcus intermedius, were tested in suspension. After mixing equal volumes of Tolonium chloride and bacterial suspension for 60s, each 200 microL of concentration (>10(6)cfu mL(-1)) was irradiated with light at 633+/-2 nm.

The effect of the disc support system on biaxial tensile strength of a glass ionomer cement.

Objective: This was to examine how varying the type of support, from a complete ring to a series of point supports, affected the biaxial tensile strength of one glass ionomer cement.

Method: Three support diameters from 11.5 to 28.