A new application area for fullerenes: voltage stabilizers for power cable insulation.

Fullerenes are shown to be efficient voltage-stabilizers for polyethylene, i.e., additives that increase the dielectric strength of the insulation material.

Cytotoxicity of post and core composites as a function of environmental conditions.

Objectives: In the revised version of ISO 7405 there are so far no detailed recommendations concerning temperature and humidity during specimen production for light curing and chemically setting dental materials. The main objective of the present study was to observe if different environmental conditions during specimen production influence cytotoxicity and degree of conversion of four post and core composite materials and to investigate if cytotoxicity of post and core materials is influenced by their corresponding bonding substances.

Methods: Specimens of four different post and core composite materials (LuxaCore - Dual, Core X-Flow, Flow White and MultiCore Flow) were produced in a climate test chamber at 23°C/50% relative humidity or 37°C/95% relative humidity and were dual-cured or self-cured, with or without their corresponding bonding substances.