PubMed Health⌕ Search

Biomedical subjects

H Brauner

Publications and source records attributed to H Brauner.

17 recordsLinked to original sources
PubMed1989

[Quantification of friction-induced corrosion of non-precious metal dental alloys].

In six commercially cast non-precious metal alloy samples friction-induced corrosion products were quantified by means of an electrochemical method. For a prosthodontic tooth restauration a model calculation arrives at uncritical ion concentrations, if measurement criteria are the daily nutritional element uptake or element concentrations considered toxic for the tissue. In case of multiple restaurations for some alloys nutritional element levels may be reached or exceeded.

Corrosion↗
PubMed1989

[Dentacolor veneer for crowns and bridges with the Silicoater process--a clinical trial].

Out of 157 patients treated by prosthodontic students with fixed crowns and bridges veneered with Dentacolor according to the Silicoater process 66 presented for the follow-up examination. A total of 284 veneer units were assessed consisting of 104 crowns and 51 pontics and cantilevers in the maxilla and 80 crowns and 49 pontics and cantilevers in the mandible. They had been in the mouth for an average of 17 months. The parameters evaluated were: colour fastness, abrasion, marginal gap formation, swelling, surface quality, and plaque formation for oral hygiene. Almost all veneers were rated "good" to "satisfactory"; therefore light-cured plastic veneers of crowns and bridges with the Silicoater process maybe recommended as a low-price alternative envolving little laboratory work versus the traditional pressure casting or shell methods.

Clinical Trials as Topic↗
PubMed1989

[Corrosion behavior of palladium-based alloys].

The electrochemical corrosion behavior of 45 palladium-based alloys both in the original state as supplied by the manufacturer and after casting was tested by potentiodynamic polarisation under quasi-stationary conditions. Based on the results of these tests the palladium-based alloys studied were classified as three different types. Showing a flat curve without pronounced corrosion peaks, type 1 corresponded to a high gold alloy. Type 3, with several pronounced corrosion peaks, resembled the well-known silver-based alloys. Type 2 showed a marked peak thus ranging halfway between type 1 and type 3. Product-related fluctuations in peak height were more frequently found in type 2 and 3 than in type 1. Casting brought about greater changes in the corrosion behaviour as against the original untreated state in types 2 and 3 than in type 1. With few exceptions the alloy composition could be attributed to the individual types. Apart from most of the type 3 palladium-based alloys almost all alloys contained gallium which is not permissible in non-precious dental alloys.

Corrosion↗
PubMed1989

[Influence of luting cement on corrosion of crown-covered post and core systems (2nd publication)].

This publication describes phantom experiments to determine the ohmic resistance of four luting materials (Harvard, Tenet, Durelon, Ketac CEM) and one root filling paste (Diaket) used to cement metal crowns on roots with cast post and core. A uniform cement layer of 2/10 mm was assumed. The electrolyte used to simulate the oral fluid was physiological NaCl solution. Under these selected conditions only two products showed a sufficiently high resistance to prevent corrosion currents. On the basis of these results attention should be paid under practical conditions to the proper selection of metals for post and core and crowns. If such conditions cannot be met, the cement gap must be of sufficient layer thickness and a luting material with high ohmic resistance and good resistance to humidity be selected.

Corrosion↗