Biomedical subjects

A Petschelt

Publications and source records attributed to A Petschelt.

At least 37 records · Page 2Linked to original sources

PubMed1989

[Cermet cements for milk tooth fillings. Preliminary results].

106 Ketac-Silver fillings in deciduous molars were reevaluated after 1 to 3.3 years, i.e. 25 month on the average. About 90% of 50 occlusal fillings and about 84% of 56 multisurface restorations were unchanged. Without claiming statistical evidence for their conclusiveness, we consider these results as an indication that cermet cements are a useful alternative to amalgam fillings in deciduous teeth, particularly since the life of these fillings is limited to the time until the milk tooth is physiologically lost.

Cermet Cements↗

PubMed1989

[In vitro studies on the quality of proximal margins of Cermet fillings in posterior teeth].

Since Cerment-cement has been recommended also for Black's Class II cavities in posterior teeth, it was the goal of this study to compare its marginal adaptation with that of amalgam after alternating thermal loads. Black's Class II cavities were prepared in extracted premolar teeth and filled with amalgam or Cermet. Three different application techniques were used for the Cermet fillings: 1. syringe only, 2. syringe and amalgam plugger, 3. individual occlusal plugger. Before and after alternating thermal loads the proximal margins were studied by SEM using replicas. The poorest results were found in the Cermet fillings applied with the syringe only. In the other three groups the results were comparable. These findings suggest that cermet cement should not be applied with exclusive use of the syringe, but should always be additionally adapted with a plugger.

Bicuspid↗

PubMed1989

[Do root canal filling materials enter dentin tubules?].

After removal of the smear layer all root filling materials tested were able to infiltrate dentin tubules. With the cement types studied, filled dentin tubules were found even at a distance of 100 microns from the root canal. The infiltration of the dentin tubules now explains the outstanding results of pigment penetration tests. The question, if the smear layer is to be removed or not, can now be answered "yes".

Dentin↗

PubMed1989

[Endodontics: mechanical or manual methods? Preparation and cleaning of root canals].

Neither with mechanical nor with manual methods is it possible to achieve a preparation of the entire root canal in all wall areas. A reasonable combination of hand instruments with engine-driven, sonic or ultrasonic units certainly has advantages in preparing, cleaning and irrigating the root canal. What is more important than the question of mechanical or manual preparation of root canals is that the operator should work meticulously and have a thorough knowledge of the root canal anatomy. While it is well possible to do without mechanical instruments in preparing root canals, manual instruments are indispensable. As far as efficiency is concerned, some recent developments are promising.

Root Canal Irrigants↗

PubMed1988