Mineral trioxide aggregate (MTA) was invented in the mid-1990s at Loma Linda University, USA, with the aim of introducing a material for use as a root-end filler that would set and develop its properties in the presence of moisture. MTA is a mixture of Portland cement and bismuth oxide, which is added to enhance the radiopacity of the material. These two components are mixed with water to produce hydrated cement. This book concisely presents information on diverse aspects of MTA and its use with a view to making it more widely available to clinicians and researchers. The topics covered include the development of MTA and its introduction into clinical dentistry, its chemical composition and setting characteristics, manipulation and placement, material properties, reactivity and the influence of environmental factors. The clinical applications are clearly explained and related innovations and further materials currently available on the market are also discussed.

Aggregate Resources provides a comprehensive collection of 27 diverse scientific papers on aggregate topics, such as geology of deposits, geophysical exploration techniques, deposit prediction and modeling, land-use case studies, production values and trends, geotechnical properties, legislation politics and others. This diversity in subject matter is further enhanced by relying on contributions from a number of countries including Australia, Belgium, Canada, Lebanon, the Netherlands, Norway, South Africa, the United Kingdom and the United States. The range of topical papers and representative countries, coupled with the global significance of the resources prompted the title Aggregate Resources: A global perspective. The book will appeal to all those involved with aggregate resources: geologists, producers, technicians , construction engineers, developers, land-use planners, legislators, academics and the public consumer, especially since all of us are in some manner, directly dependent or indirectly affected by this resource. *Each chapter is a study on a particular area of importance for aggregate producers. Pit & Quarry, April 1998.