Dureza de amalgamas dentales según las partículas y métodos de condensación

Abstract

To objectify the variations in the hardness of amalgams with spheric particles and in filing amalgams by different methods of condensation, a) manual, b) mechanical and e) ultrasonic method, 90 test tubes w(thmechanical amalgamators were ma de. They were divided in 3 groups of 30 test tubes each, corresponding to the different particles and differentalloy trademarks used. They were all treated with the condensation methods above mentioned. The test tubes were filled and metalographically polished, measuring Vickers hardness making three indentations in each test tube, a) on the nucleus, b) on the middle of the radioe) on the surfaces. The figures obtained were tabulated and they underwent a cuantitative statistical analysis.

1) the hardness of hand condensed amalgams is less in filling amalgams and greater in spheric enes.

2) The hardness of the mechanically condensed amalgams is less in the filling amalgams and greater in the spheric ones.

3) The hardness produeed by the ultrasanie condensation is greater in the spherie amalgams and less in the 7ifling ones.

4) In comparing the hardnes of the same amalgam treated by the different eondensation methojs it is proved that, a) the hardness is greater under manual eondensation b) it is medium when mechanically eondensed and e) less under ultrasanie eondensation. ldentieal results

were obtained with the different types of alloys.