caa a22 4500 475782275 CHVBK 20180406123647.0 cr unu---uuuuu 170329e20000101xx s 000 0 eng 10.1023/A:1008979532764 doi (NATIONALLICENCE)springer-10.1023/A:1008979532764 Influence of thermal treatments on Ag Sn Cu powders in order to reduce mercury contents in dental amalgam [Elektronische Daten] [Cora Bracho-Troconis, Pierre Colon, Jean-Dominique Bartout, Yves Bienvenu] The mercury content of dental amalgams is a controversial subject with regard to the biological properties of these materials. The object of this study is to optimize the thermal treatments performed on an experimental powder in order to obtain a low mercury ratio (41% by weight) while preserving the desirable clinical qualities of the material. Using atomized powder, two types of thermal treatments are performed: A1, to obtain a partially annealed structure and A2, to obtain a complete homogenization. The kinetics of the amalgamation reaction is mainly evaluated by X-ray diffraction to identify the newly formed phases as a function of setting time. Mechanical properties are evaluated according to the ISO norms at 37 °C. Metallographical examination of the amalgams shows a <<Ag-Hg>> phase which acts as a matrix incorporating the <<Cu-Sn>> and <<Ag-Sn>> compounds. The setting kinetics of the A1 amalgams is linear and slightly more rapid than that of the A2 amalgam. The mechanical properties of the amalgams are significantly improved regarding the higher mercury content commercial amalgams. A specific thermal treatment permits us to slow down the diffusion of mercury between the different intermetallic compounds into the powder. The final amalgam composition, thus, most approaches the stoechiometric ratio calculated from a quaternary diagram. Kluwer Academic Publishers, 2000 Bracho-Troconis Cora Laboratoires Septodont, France aut Colon Pierre Centre Des Materiaux P.M. Fourt, Ecole Nationale Superieure Des Mines De Paris, France aut Bartout Jean-Dominique Centre Des Materiaux P.M. Fourt, Ecole Nationale Superieure Des Mines De Paris, France aut Bienvenu Yves Centre Des Materiaux P.M. Fourt, Ecole Nationale Superieure Des Mines De Paris, France aut Journal of Materials Science: Materials in Medicine Kluwer Academic Publishers 11/1(2000-01-01), 1-9 0957-4530 11:1<1 2000 11 10856 https://doi.org/10.1023/A:1008979532764 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1008979532764 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bracho-Troconis Cora Laboratoires Septodont, France aut NATIONALLICENCE 700 1- Colon Pierre Centre Des Materiaux P.M. Fourt, Ecole Nationale Superieure Des Mines De Paris, France aut NATIONALLICENCE 700 1- Bartout Jean-Dominique Centre Des Materiaux P.M. Fourt, Ecole Nationale Superieure Des Mines De Paris, France aut NATIONALLICENCE 700 1- Bienvenu Yves Centre Des Materiaux P.M. Fourt, Ecole Nationale Superieure Des Mines De Paris, France aut NATIONALLICENCE 773 0- Journal of Materials Science: Materials in Medicine Kluwer Academic Publishers 11/1(2000-01-01), 1-9 0957-4530 11:1<1 2000 11 10856 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer