Adesão do Streptococcus mutans a diferentes resinas utilizadas na confeção de provisórios fixos

Abstract

INTRODUCTION: Provisional materials, compared to permanent ones, are more prone to bacterial colonization due to their high porosity and surface roughness, as well as their poorer marginal adaptation. The formation of a biofilm on the surface of provisional restorations can promote inflammation of the gingival tissues and the development of secondary caries in the abutment teeth. There are several types of resins that can be used for the preparation of fixed provisional restorations, including new resins adapted to the CAD-CAM. However, studies on the biological behavior of these new resins are still scarce. This work aimed to compare the susceptibility of different resins used in the preparation of provisional fixed prosthesis to the adhesion of Streptococcus mutans (S. mutans). METHODOLOGY: 5 specimens of each type of resin (Tab 2000 – resin A, Structur 3 – resin B, Structur CAD – resin C, Dental Sand – resin D) were prepared, shaped into circular forms with standardized dimensions (10x2mm). The specimens were subjected to the same polishing protocol. The adhesion of S. mutans to the polished surface of the four resins was evaluated through scanning electron microscopy. Additionally, the biomass of adhered microorganism to the surface of the specimens was quantified. The results obtained were subjected to statistical analysis, with a significance threshold of p<0,05. RESULTS: Resins A and B exhibit higher density of S. mutans adhesion compared to resins C and D, as evidenced by the observed cell counts. Regarding the adhered biomass, 3D-printed and bis-acrylic resins showed higher adhesion on; however, the differences between the various resins were not statistically significant. CONCLUSION: The differences in susceptibility to S. mutans adhesion among resins can be attributed to the inherent physicochemical characteristics of the resins and their respective processing techniques; however, further studies are suggested.

Date of Award	24 Jul 2024
Original language	Portuguese
Awarding Institution	Universidade Católica Portuguesa
Supervisor	Helena Salgado (Supervisor), Ana Peixoto Gomes (Co-Supervisor) & Patrícia Fonseca (Co-Supervisor)