Comparison of the effect of three types of metal, ceramic and self ligating orthodontic brackets on Streptococcus mutans adhesion

With spreading orthodontic treatments and mouth flora change during orthodontic treatment and increasing of white lesions around orthodontic appliances in patients undergone orthodontic treatments and also controversial reports about the different brackets types and their effect on adhesion of streptococcus mutans, this study aimed to compare the effect of different orthodontic bracket (metal, ceramic, self -ligating) on growth and adherence of streptococcus mutans.

This experimental Invitro study was accomplished on 60 samples. Three types of brackets (metallic, ceramic and self ligating) related to premolars were used for comparison of streptococcus mutans adhesion. Each of the brackets were placed into tubes containing 15cc of sterile Nutrient broth with %20 sucrose. Then 5cc of bacterial suspension were added to each plates. Plates were incubated for 5 days at 37°C. Then, after removal of the nutrient broth liquid from plates, plates upside down and the number of colonies attached to the plate was counted by eye according to Colony forming unit (CFU) and. Data were analyzed by ANOVA test.

The study was done by 60 samples including three types of metal, ceramic and self ligating brackets. The results of the study showed that the maximum streptococcus mutans adhesion was belonged to self ligating brackets (51.25±15.01), metal brackets (21.8±7.1) and ceramic brackets (15.5±3.6), respectively and the difference between three gourps was significant (P<0.001).
 

The growth and adhesion of Streptococcus mutans is different in the presence of various orthodontics bracket material and bracket designs.  The most and the least  Adhesion of streptococcus mutans was in self ligating and the ceramic  brackets adhesion had least streptococcus mutans, respectively