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Biomedical subjects

T Jedrzejewski

Publications and source records attributed to T Jedrzejewski.

At least 19 recordsLinked to original sources
PubMedDate not supplied

[Effect of the convergence angle of the ground tooth and the force of cast crown fastening using various types of cement].

The authors measured the effect of the convergence angle of the ground tooth on the fastening of cast crowns. The study was carried out on phantom models of teeth made of stainless steel with abutement convergence angles from 1 to 10 degrees. The force of the connection was measured using the Instron testing device. The avulsing force acted along the long axis of the abutement. Additionally the fixing force of phosphate, polycarboxylate and ionomer-glass was compared. A fall of the force of crown fastening was observed with increasing value of the convergence angle of the abutement, especially for phosphorus and ionomer-glass cement. The crowns fastened with polycarboxylate cement showed a threefold smaller fall of the fastening force with increasing value of the convergence angle of the abutement.

Crowns↗
PubMedDate not supplied

[The influence of the span of a bridge on oral epithelium. Cytoenzymatic examinations].

Cytoenzymatic examinations of epithelium in swabs taken from under metal and metal-acrylic bridges have been performed in 25 men without clinically perceptible changes in mucous membrane. Reactions on acid phosphatase, alkaline phosphatase and unspecific esterase have been performed. The results obtained point out that lysosomal enzymes are the factor damaging epithelium under the bridge. Damaging influence of the bridge on the epithelium has logical importance. It seems that keratosis process in epithelium cells under bridges starts off normally, however, it is not finished. Acryl monomer in the medium of oral cavity fluids probably plays essential role in formation of changes in the cells of intermediate and deep layers epithelium.

Denture Design↗