Zahn-, Mund-, und Kieferheilkunde mit Zentralblatt最新文献

The antimicrobial efficiency of zinc chloride solution in concentration from 0.1% to 2.0% and 0.2% chlorhexidine solution has been examined on the strains of reference in a comparative study. Three test methods were applied: the agar diffusion test, the dilution test and the suspension test. As was to be expected the antibacterial effect of the zinc chloride solution was dependent on concentration. Between 0.1% and 2.0% the zinc chloride solution showed a bacteriostatic effect on the strains of reference only; the application of higher concentrated solutions is not indicated intraorally. 0.2% chlorhexidine solution showed a bactericidal effect on the test germs.

This study showed no difference between the use of the "Piezon Master 400", using four different attachments as compared to the "Hu Friedy" Curettes as far the formation of grooves and scratch marks is concerned. Both root planing methods gave rise to a scalloped surface of the root cement. The ultrasonic root planing however showed a more discrete scalloped surface with very small tears and having a hammered appearance. Hand instrumentation showed much wider tears on the root surface structure.

In a clinical microbiological study the microflora of cavity floors in 41 permanent teeth was investigated after several month of caries excavation and with or without Calxyl application on hard dentine prior sealing with zincphosphatecementum and amalgam. The cavity floors were only lowly infected. Actinomycetes or acidogenic and aciduric streptococci and lactobacilli dominated in the CFU. After application of Calxyl actinomycetes (A. israelii) were found 3-fold more frequently in the remaining population than streptococci (S. mutans) and lactobacilli. Without application of Calxyl their ratio was 1:1. S. mutans seems to be important for the carious progression in dentin.

A group of 61 patients underwent conservative and surgical dental treatment in general anesthesia and their blood was sampled for bacteremia before and after treatment. The antibiotic antibacterial prophylaxis was administered in 21 patients one hr. before treatment (both in conservatively and surgically treated patients). Immediately after the treatment the prevalence of bacteremia amounted to 80% in a group of ATB-free patients. In patients with ATB prophylaxis the prevalence of bacteremia after the treatment amounted to 17%.

The absolute values of polymerization shrinkage and its time-dependent course were measured for commercially available visible-light-cured composite resins and for composite still under development. About the curing rate of the composites were discussed the influences of the fillers and of the amount of the photoinitiator in the organic matrix.

In 10 patients with indication to tooth extraction swaps from the microbiotopes "sulcus/gingival pocket", "root canal", "socket" and "extraction wound 2 and 7 days after extraction" were investigated bacteriologically. The anaerobic-aerobic mixed flora with predominance of anaerobes verified in the microbiotopes "sulcus/gingival pocket", "socket" and "extraction wound 2 days after extraction" was identically. The flora of the root canal was distinguished by a smaller amount of microbes with predominance of aerobes. In the 7 days old extraction wound only single aerobes could be verified whereas anaerobes were missed totally.

The general performance and correlations of voice and speech are explained. The speech function is characterized in its spheres of activity, its development and acquisition are described.

Determining the individually optimal position of the lower incisors is one of the important factors in diagnosis and treatment planning. The study compares the accuracy of a number of methods postulated by different authors. It clearly shows that regression models display the highest accuracy in predicting the optimal incisor position. The most important variables in the prognosis are ANB angle and the prominence of the chin as measured by the distance of pogonion to NB line. The best regression model is presented as a formula and in a graphical representation.