A release of acid soluble constituents that absorb at 260 mp occurs during the incubation of suspensions of Escherichia coli H (1)) Pseudomonas aeruginosa (2)) or Lactobacillus arabinosus (3) in buffers. Lysogenic E. coli strain Klz as well as nonlysogenie E. coli strains B and B/r excrete ultraviolet-absorbing substances during growth in media deficient in glucose, and a methionine-requiring a...

PURPOSE To investigate the sealing properties of root fillings with resin-coated gutta-percha cones and a methacrylate-based resin endodontic sealer with and without an accelerator component in root canals subjected to immediate or delayed post space preparation. METHODS Forty-eight extracted human teeth with single straight root canals were treated endodontically. Specimens were then assigne...

Pathogenic bacteria can interfere with the body health by producing toxic substances, damaging tissues, multiplying and killing healthy cells. Therefore, it is crucial to explore safe alternative treatment strategies, such as developing natural bactericidal agents eradicate infections. Red ginger (Zingiber officinale var. rubrum) has potential an antibacterial, so important study its activity i...

A systematic approach was developed to understand, in-depth, the mechanisms involved during the inactivation of bacterial cells using photoelectrocatalytic (PEC) processes with Escherichia coli K-12 as the model microorganism. The bacterial cells were found to be inactivated and decomposed primarily due to attack from photogenerated H2O2. Extracellular reactive oxygen species (ROSs), such as H2...

PURPOSE To (1) study the injury and healing activity of the pulp tissue to calcium hydroxide [Ca(OH)2], resin composite (RC) and resin-modified glass-ionomer (RMGI) materials when used as direct pulp capping agents, and (2) compare the incidence of healing defects between these materials. METHODS 135 Class V pulp exposed cavities were prepared in non-human primate teeth. Direct pulp capping w...

AIMS The purpose of this study was to compare microbial penetration method and electrochemical technique for evaluation of the apical seal. MATERIALS AND METHODS A total of 28 teeth were prepared using the step-back technique to ISO size 40 master apical files. The specimens were randomly divided into an experimental group, two positive and two negative controls. Root canals in the experiment...