Avaliação da aderência de biofilme bacteriano em bráquetes metálicos, plásticos e cerâmicos

• Autor(a) principal: Santos, Rodrigo André Tavares dos
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/14081
• topic: Orthodontic brackets; Dental plaque; Biofilm; Orthodontics; Bráquetes ortodônticos; Placa bacteriana; Biofilme; Ortodontia; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA::ORTODONTIA

Different surfaces of orthodontic accessories can demonstrate distinct microbiological impact when exposed to the oral cavity. This paper discusses aspects related to the biofilm adherence in brackets of different compositions and structural types and with the most commonly used ligation methods. Forty volunteers had salivary samples taken for microbiological assessment and 15 of them were selected within specific patterns of bacterial colonization. We used six different duplicate sets of brackets affixed to individual acetate plates which were used for a twenty-four hours period to allow biofilm formation. The devices were removed and placed in specific microbial culture media for growth of total bacteria, Streptococcos mutans and Lactobacillus sp. Results were expressed as the number of colony forming units per miligram of plaque attached (CFU/mg) and then submitted to the Friedman test to compare groups. Differences were evaluated using the Wilcoxon test with Bonferroni correction, with 80% power and significance level of 5%. In the analysis of total bacteria, there was no detectable statistical difference that could make distinctions between the brackets evaluated. To Streptococcos mutans, we observed a statistically significant difference (p=0,032) and the data obtained showed a lower trend of microbiological adherence to the three types of ceramic brackets tested (monocrystalline, polycristalline and self-ligating). There was not enough growth of Lactobacillus sp. colonies that would allow proper comparison between groups.