[Comparative clinical study of amalgam fillings].

Two different types of amalgam alloys (Strafill NG2, [Ogussa] and googfill 700 [Ogussa]) were placed into 106 contralateral, homologous molar tooth-pairs of 81 patients. Scoring after two years showed significant difference in case of marginal ditching favouring the non gamma2 alloy. However significant differences were not found in case of other observed failures, such as bulk fracture, surface roughness and secondary caries.

[Effect of preparation methods on the adaptability of conventional amalgams and amalgams without gamma-2-phase].

Experimental investigations with "Goodfill 700" and "Starfill NG2" amalgams showed, that the adaptability and plasticity depend not only on characteristics of the powder, but are influenced by mixing ratios resp. methods of condensation. Fillings performed from "Starfill NG2", possessing a higher content of powder, but in spherical and smaller particles, have a better adaptability, however a more loose structure at the edges.

[Toxicological implications of amalgams].

Nowadays hard attacks have been launched by the media against the use of dental silver amalgams. Different diseases are attributed to dental amalgams mostly because of their mercury contents. These claims are based mainly on suppositions without controlled scientific studies.

[Condensation of elements in the polished surface of amalgam fillings Homodent-1 and Goodfill].

The gamma-2 phase may be found on the polished surface of both the "Homodent-1" and the "Goodfill" amalgam fillings. In case of "Homodent-1" the tin shows two patches of enrichment of different diameters. The inhomogeneity of silver is less express on the surface of "Goodfill" than in case of "Homodent-1".

[Examination of the polished surface of the amalgam filling materials Homodent-1 and Goodfill].

After polishing by means of a rubber bell at 3000 rpm during one minute the surfaces of both examined amalgam fillings show parallel furrows and irregular depressions. The surface of the "Homodent-1" amalgam fillings show in addition a great number of micropores by which the filling gets a spongy appearance. On the surface of the "Goodfill" amalgam filling but few micropores can be observed.

[Comparative electron microscopy scanning study of Homodent-1 and Goodfill silver amalgam powders].

The grain diameters of the silveramalgam powder "Homodent--1" lie in the range between 2 microns and 250 microns. According to their dimensions the grains don't form groups. The shape of the grains is irregular, it does not look like either the spherical or the mechanically disintegrated fillings.

[Scanning electron microscopy study of the breaking surface of the amalgams Homodent-1 and Goodfill].

The undissolved grains of the "Homodent--1" alloy are more loosely embedded into and are more loosely connected to the matrix than the "Goodfill" grains. Air bubbles of the "Homodent--1" fillings have bigger pores than those of the "Goodfill". The microstructure of the "Goodfill" amalgam is more advantageous than that of the "Homodent--1".

[Surface problems in preparing Evicrol fillings].

The polymerization of Evicrol, like that of other composites, is adversely affected by atmospheric oxygen. This negative effect may be avoided by the use of matrices. On filling class V cavities, the utilization of well adaptable cellophane, aluminium and tin foils is justified.