Antibacterial activity of four materials restoration in vitro.

The aim of this study was to verify, in vitro the growth inhibitory effect on S. mutans restoration of dental materials, zinc oxide Eugenol, Glass Ionomer Modified with Resin, Glass Ionomer Conventional, composite resin and Amalgama.
The methodology is standardized disks of different materials was maked. Was isolated a strain of S. mutans from saliva.
It employed an experimental method to determine how quantitative growth inhibitory S. mutans through its absorbance in BHI broth, measured by spectrophotometer . It was analysed at different stages in the growth curve of S. mutans for each material.
The results were evaluated through the multiple comparison test of Turkey and Scheffé to compare them and Dunnet test to compare these with control. The statistical analysis was done with the program SPSS 11.0.
Results: the average values of extinction in relation to time, delivering low values of IRM,  Vitremer and Ketac molar in relation to control. The absorbance values of resin composite and amalgam showed no significant differences in relation to control. In relation to the growth curve reached with the various materials at all stages of the curve, IRM shows have less absorbance, in contrast with amalgam and composite resin showing a growth curve statistically similar to the control group.
We conclude the strong antimicrobial activity of IRM that showed better inhibitory effect on growth of S. mutans.  Vitremer, have demonstrated better inhibitory effect than conventional ones. Meanwhile, composite resin and Amalgam not exhibited a significant inhibitory effect on growth significantly S. mutans.