A STUDY ON STRAIN-AGING OF DENTAL COBALT-CHROMIUM ALLOY WIRES : (3rd Report) Electric Resistance Measurement and Others

Effect of surface passivation on corrosion of a cobalt-chromium dental alloy: surface morphology and chemical composition studies

Abstract   Background and Aim: Biocompatibility in some respects depends on the corrosion behavior of dental alloys. The purpose of this study was to investigate the effect of surface passivation of a cobalt chromium alloy on corrosion behavior. Materials and methods: In this experimental study, 20 samples of Flexicast dental alloy were prepared according to ADA97 standard and after casting, t...

Effect of particulate cobalt, chromium and cobalt-chromium alloy on human osteoblast-like cells in vitro.

Evaluation of stress-relief methods on cobalt-chromium orthodontic wires.

Stress-relieving heat treatment is reported to accelerate the elastic memory process in order that the configuration of cold-worked orthodontic wires becomes more stable. In this experiment, 3 methods of stress-relieving O.036-inch cobaltchromium orthodontic wires used in the fabrication of spacemaintaining appliances were evaluated. The results showed that stress relief in a dental oven, by th...

A dental technician with pulmonary fibrosis: a case of chromium-cobalt alloy pneumoconiosis?

A 45 yr old male developed pulmonary fibrosis after 29 yrs of employment as a dental technician. He subsequently developed adenocarcinoma of the lung. Diffuse interstitial fibrosis was seen using light microscopy. Neutron activation analysis of non-neoplastic lung tissue demonstrated high levels of chromium and cobalt suggesting the possibility of a chromium-cobalt alloy pneumoconiosis.

The effects of particulate cobalt, chromium and cobalt-chromium alloy on human osteoblast-like cells in vitro.

Particulate wear debris can induce the release of bone-resorbing cytokines from cultured macrophages and fibroblasts in vitro, and these mediators are believed to be the cause of the periprosthetic bone resorption which leads to aseptic loosening in vivo. Much less is known about the effects of particulate debris on the growth and metabolism of osteoblastic cells. We exposed two human osteoblas...