Introduction: Bacterial adhesion is influenced by a series of factors, that may be differentiated as: factors depending on the substrate, factors depending on the bacterial cell and environmental factors. Obviously, the presence of microorganisms is observed not only on dental, periodontal or mucous structures, but also on the surface of some biomaterials utilized in prosthtetic therapy.
Materials and method: The study of oral microorganisms, aimed at their identification and description, requires collecting of various pathological products, followed by their impregnation on a suitable culture medium. The present investigation was carried out on 52 patients: 20 representing the control group, and 32 making up the experimental group. The age of the patients ranged between 45 and 70 years, various degrees of oral hygiene being recorded. Out of the removable acrylic prostheses, 16 were made of Duracryl and the other 16 of Duracryl physically-improved by covering with Palaseal. After 15 days of using removable prostheses, there followed sample collections for the identification of the microorganisms present on their surface.
Results and discussion: More numerous microorganisms could be noticed at the level of Duracryl-made prostheses, and fewer on those made of Duracryl covered with Palaseal. The high microbial load present on the acrylic surfaces may be explained by their porosity, while the prostheses covered with Palaseal have a smooth and glossy surface, to which adhesion is more difficult.
Conclusions: As a result of the acrylic surfaces covered with Palaseal, adhesion of the microorganisms present in the oral cavity is reduced, due to the presence of a fine and glossy surface, which diminishes both the residual food accumulation and the bacterial plaque, as a result of the improved oral hygiene they provide.
- oral microorganism
- removable prostheses