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Biomedical subjects

H C Sandig

Publications and source records attributed to H C Sandig.

18 recordsLinked to original sources
PubMed1991

[The evaluation of the adhesive properties of dental materials by using radioactive-labelled bacteria].

Dental materials with different surfaces were incubated with 111In-oxine-labelled bacteria Streptococcus mutans 20 min respectively 2 h, 6 h and 24 h. To determine the amount of the bacteria accumulated on the specimens we measured the radioactivity with a scintillation counter. The same measuring was done after decontamination by the help of ultrasonication. The comparison of activities shows that different dental material surfaces adhere different amounts of bacteria. The adhesive properties are material and time dependent, but the surface processing has a lower influence on the bacterial adherence. The lowest degree of bacterial adherence has the cobalt base alloy Gisadent KCM 83. On the other hand the highest remaining activity was found after decontamination of cobalt base alloy and PMMA resin Kallocryl A.

Adhesiveness↗
PubMed1989

[SDS electrophoretic evaluation of salivary protein adsorption to different dental materials].

After different pretreatments of surface the alloys Sipal, Gisadent KCM 83 and Gisadent NCA and the PMME resin Kallocryl A were contaminated with mixed saliva for 1.5 hours. Thereafter, the proteins which could not washed off with water were desorbed from the materials by using a dodecyl sulphate-containing buffer, and analyzed SDS electrophoretically and densitometrically. The pattern of the proteins desorbed reflected a fairly unspecific adsorption of the salivary proteins independent on the kind of the dental material used. Whereas the ranges of the low (10-25 kDa) and the high (greater than 50 kDa) molecular mass polypeptides share nearly equal quotas in the protein pattern of the original saliva, a generally higher portion (68-99%) of the smaller polypeptides was shown among the proteins desorbed from the materials. This effect was especially marked after a shot-peening of alloys and a very high polishing of resin. A somewhat higher percentage of the larger proteins (18-51%) were desorbed from the materials which were pretreated by fine-smoothing or sandblasting.

Adsorption↗
PubMed1978

[Efficacy of the use of combinations of teaching aids in propaedeutics education].

Audio-visual and printed teaching and learning aids are used for the instruction in the subject of "propaedeutics of prosthetic stomatology". The achievements and the time required for the guidance and supervision of the students were evaluated. Furthermore, the use of the teaching and learning aids by the students was assessed. It was found that audio-visual means of demonstration favour the process of learning and facilitate considerably the task of the teaching staff.

Audiovisual Aids↗