Calcium Silicates Part 1. Synthesis

Hemolytic activity of five different calcium silicates.

Mineral characteristics and the in vitro hemolytic activity of three synthetic and two natural calcium silicates (CaSi) are compared. Hemolysis is higher for the synthetic compounds than for the natural ones. The difference is accentuated by weak ultrasonication of the minerals. No variation was observed within the two groups, including both acicular and fibrous forms. Calcium was released from...

Enhanced bioactivity of glass ionomer cement by incorporating calcium silicates

Glass ionomer cements (GIC) are known as a non-bioactive dental cement. During setting the GIC have an acidic pH, driven by the acrylic acid component. It is a challenge to make GIC alkaline without disturbing its mechanical properties. One strategy was to add slowly reacting systems with an alkaline pH. The aim of the present study is to investigate the possibility of forming a bioactive denta...

Relational geometric synthesis: Part 1 - framework

A novel object-orientated framework is proposed for 3D computer-aided design. Geometric objects including points, lines, curves, surfaces and solids are defined and constructed in a system which captures and retains many dependency relationships between objects, in a data structure equivalent to a directed graph. The primary advantage is automatic updating of the model, preserving relationships...

Part B 2 . 1 . Ammonia Synthesis

Calcium revisited: part I.

In February 2013, the US Preventive Services Task Force (see www.uspreventiveservicestaskforce.org) recommended 'against daily supplementation with 400 IU or less of vitamin D3 and 1000, mg or less of calcium for the primary prevention of fractures in non institutionalized postmenopausal women', which illustrates the divergence of opinions. This review wants to shed an objective light on the im...