Effect of Enterococcus faecalis Biofilm on Corrosion Kinetics in Titanium Grade 4 Alloys with Different Surface Treatments

E. faecalis has been associated with bacteremia, sepsis, and bacterial endocarditis and peri-implantitis. This microorganism can remain in the alveolus even after extraction of the root remnant. This study aimed to evaluate the corrosion on different surfaces of commercially pure titanium (Ti) grade 4 (Ticp-G4) as a function of the bacterial biofilm effect of Enterococcus faecalis. A total of 57 discs were randomly divided according to their surface finish (n = 19). For microbiological analysis (n = 9), the discs were placed in 12-well plates containing E. faecalis culture and incubated at 37 °C for 7 days. The results show that for the intergroup analysis, considering the "electrolyte" factor, there was a difference between the groups. There was greater biofilm formation for the D.A.Zir group, with greater electrochemical exchange for Biofilm, and the presence of biofilm favored greater electrochemical exchange with the medium.

Influence of Gutta-Percha Surface on Enterococcus faecalis Initial Adhesion In Vitro: An Atomic Force Microscopy Study

The aim of this study was to evaluate the influence of surface topography of gutta-percha (GP) cones and plasticized disks of GP on the initial adhesion of Enterococcus faecalis (E. faecalis). The GP cones (Tanari and Dentsply brands) were cut 3 mm from the apical portion and fixed on a glass slide. To make the disks, the cones were thermoplasticized in standardized molds. The specimens were divided into groups according to the shape of the GP and the presence or absence of the bacteria. For contamination, the strain of E. faecalis (ATCC 29212) was used. The surface topography was analyzed using an atomic force microscope (AFM). The surface, roughness, and waviness parameters were evaluated by the Kruskal-Wallis and Dunn test. The comparison between disks and cones showed significant differences, where the cones were rougher, with a higher value attributed to the Dentsply cone (DC group). The same was observed for the waviness. After contamination, there was greater bacterial accumulation in cones, especially in their valleys, but both the surface and the topography became more homogeneous and smoother, with no differences between disks and cones of both brands. The topographic surface of the GP, at the micro and nanoscale, influences the initial adhesion of E. faecalis, with a greater tendency for contamination in regions associated with the presence of roughness and waviness. In this context, plasticization of GP is indicated, as it reduces surface irregularities compared to cones, contributing to less retention of bacteria.

[Psychological aspects and essential arterial hypertension]

In addition to organic and hereditary factors, psychological variations among individuals are also known to play an important role in the etiology of essential arterial hypertension.

OBJECTIVE

To investigate in detail the psychological processes possibly involved in the etiology of essential arterial hypertension.

METHODS

A group of 20 subjects, all of whom where diagnosed as suffering from essential arterial hypertension, was studied using psychological interviews and the Rorschach Test. The results obtained were compared with those gathered from normal (non-hypertensive) individuals represented by the Rorschach Test for the Brazilian population.

RESULTS

In terms of personality structure, the hypertensive group presented signs of subjective and immature mechanics which prevailed over more mature and adult traits. These characteristics lead the patients to emotional withdrawal as a defense inadequate affectivity.

CONCLUSION

The blocking of emotional expression, as well as simultaneous anxiety, may affect the autonomic nervous system and lead to periodic transitory hypertensive crises which, with time assume a permanent nature.

[Cholecystectomy using median minilaparotomy. A new method]

A new methodization is proposed to perform cholecystectomy through a minor laparotomy (3-6 cm) in midline (in the middle third of the linea alba). Twenty-one patients were submitted to cholecystectomy by gallstones including acute cholecystitis. No postoperative complications occurred and the discharge from hospital was in the first and second day.