EFFECT OF HYGROTHERMAL AGEING ON TRIBOLOGICAL BEHAVIOUR OF PTFE-BASED COMPOSITES

The present study investigates the influence of hygrothermal ageing on the tribological behaviour of polytetrafluoroethylene (PTFE) polymer composites.Three PTFE composites along with unfilled PTFE were tested in sliding contact against Inconel 625 (a Ni-based alloy) plates in both dry and water-lubricated conditions, utilising a unidirectional pin

Objective : Expansion screws like Hyrax, Haas and other types, produce heavy interrupted forces which are unfavorable for dental movement and could be harmful to the tooth and periodontium.The other disadvantage of these screws is the need for patient cooperation for their regular activation.The purpose of this study was to design a screw and compa