In vitro evaluation of the influence of resin acrylic surface polishing for orthodontic appliances on adhesion and removal of Streptococcus mutans

Selma Sano SUGA, Antonio Carlos GUEDES-PINTO, Maria Regina L. SIMIONATO

The aim of this in vitro microbiologic analysis was to evaluate the adhesion of microorganisms on the internal surface of intra oral removable plates made in acrylic resin for orthodontic and prosthetic appliances. The hypothesis to be tested was that there is an association between chemical or mechanical polishing and the microbilogical adhesion of Streptococcus mutans. The chemical and mechanical cleasing of the appliances was also checked. Forty eight appliances were prepared and divided into 3 groups. Each group was subdivided in 2 groups, concerning the different types of polishing. Group 1) control; Group 2) mechanical brushing of the acrylic resin plates with Denture Brush, Kolynos; Group 3) hygiene (chemical cleansing) of the appliances by immersing them in sodiun perborate solution for 30 minutes (Fizzy Cleanser of Prosthetic and Orthodontic Appliances, “Fórmula & Ação” Pharmacy). By the statistical results, obtained from the described analysis, it was concluded that the polishing type performed in the internal surface of acrylic resin did not influence the adhesion of Streptococcus mutans. The inferential analysis, implemented by comparing the assessed groups, determined that there was a reduction in the removal of biofilm formed by the contamination of Streptococcus mutans in the groups. The chemical cleanser was more efficient than the mechanical brushing. However there was no difference between the subgroups, confirming that polishing type (chemical or mechanical) did not influence the adhesion and removal of Streptococcus mutans.

Keywords: Resin acrylic. Removable orthodontic appliance. Streptococcus mutans.

Saturday, May 04, 2024 15:44