Park J W, An J S, Lim W H, Lim B S, Ahn S J. Microbial changes in biofilms on composite resins with different surface roughness: An in vitro study with a multispecies biofilm model. J Prosthet Dent 2019; 122: 493.

Periodic finishing of surface roughness should be considered to minimise adhesion of cariogenic streptococci to composite resin surfaces.

This in vitro study investigated microbial changes in biofilms on composite resins of varying surface roughness. Composite resin disks were prepared with different roughness: SR180, SR400, SR1500, and SRGlass roughened with 180-, 400-, and 1500-grit silicon carbide paper and glass (control surface without roughening). After multispecies biofilms had been grown on the composite resin surfaces, the adhesion of Streptococcus mutans, Streptococcus sobrinus, Porphyromonas gingivalis, Aggregatibacter actinomycetemcomitans, and of total bacteria was determined after one (T1) and four (T2) days. Increased surface roughness was not proportional to bacterial adhesion. Significant differences in the adhesion of total bacteria was only found between SRGlass and SR180. The adhesion of S. mutans and S. sobrinus to SR180 and SR400 was higher than that to SRGlass. The adhesion of A. actinomycetemcomitans and P. gingivalis to composite resin was not significantly influenced by surface roughness. Adhesion of total bacteria, S. mutans, and S. sobrinus increased, whereas the adhesion of periodontal pathogens decreased from T1 to T2.