Long-term microwaving of denture base materials: effects on dimensional, color and translucency stability.

Introduction: While the combined effect of microwave irradiation with cleansing solutions on denture base materials has been investigated, the effects of only using microwave irradiation and, more importantly, in a long-term basis, was not studied yet.

Objective: The purpose of this study was to evaluate the effect of a long-term repeated microwaving on the dimensional, color and translucency stability of acrylic and polyamide denture base materials.

Material And Methods: Thirty two specimens (32 mm x 10 mm x 2.

Melt processing and property testing of a model system of plastics contained in waste from electrical and electronic equipment.

In the present research, blending of polymers used in electrical and electronic equipment, i.e. acrylonitrile-butadiene-styrene terpolymer, polycarbonate and polypropylene, was performed in a twin-screw extruder, in order to explore the effect process parameters on the mixture properties, in an attempt to determine some characteristics of a fast and economical procedure for waste management.

Local treatment of experimental Pseudomonas aeruginosa osteomyelitis with a biodegradable dilactide polymer releasing ciprofloxacin.

A biodegradable system of poly-D,L-dilactide releasing ciprofloxacin was assessed in a Pseudomonas aeruginosa osteomyelitis model after inoculation of the test pathogen into the left tibia of 76 New Zealand White rabbits; 31 were controls (group A), and 45 were implanted with the polymer at the infection site (group B). The rabbits were killed on a weekly basis, and cancellous bone was harvested for histopathology and for estimation of bacterial growth and the concentrations of ciprofloxacin. Tibial X ray was performed immediately before the animals were killed.

Bonding of silicone extra-oral elastomers to acrylic resin: the effect of primer composition.

Silicone elastomer is bonded to acrylic resin in many facial or oro-facial prostheses. The silicone elastomer/acrylic resin bond has been reported to be insufficient and primers have been used to enhance the bond. This study investigated the bond strength of silicone elastomer to acrylic resin using different types of primers.

Evaluation of porosity in microwave-processed acrylic resin using a photographic method.

Statement Of Problem: The effect of microwave polymerization on the porosity of denture base resin has not been fully determined.

Purpose: This study investigated the effect of microwave energy on the porosity of 2 heat-activated denture base resins.

Material And Methods: Two heat-activated denture base resins, one conventional (Paladon 65) and one designed for microwave polymerization (Acron MC), were used to prepare 50 test specimens.