Influence of epoxy, polytetrafluoroethylene (PTFE) and rhodium surface coatings on surface roughness, nano-mechanical properties and biofilm adhesion of nickel titanium (Ni-Ti) archwires

مقال فى مجلة

Aim. To investigate the effect of epoxy, polytetrafluoroethylene (PTFE) and rhodium surface coatings
on surface roughness, nano-mechanical properties and biofilm adhesion of nickel titanium (Ni-Ti)
archwires Methods. Three different coated (Epoxy, polytetrafluoroethylene (PTFE) and rhodium) and
one uncoated Ni-Ti archwires were evaluated in the present study. Surface roughness (Ra) was
assessed using a non-contact surface profilometer. The mechanical properties (nano-hardness and
elastic modulus) were measured using a nanoindenter. Bacterial adhesion assays were performed
using Streptococcus mutans (MS) and streptococcus sobrinus (SS) in an in-vitro set up. The data obtained
were analyzed using analyses of variance, Tukey’s post hoc test and Pearson’s correlation coefficient
test. Result. The highest Ra values (1.29±0.49) were obtained for epoxy coated wires and lowest Ra
values (0.29±0.16) were obtained for the uncoated wires. No significant differences in the Ra values
were observed between the rhodium coated and uncoated archwires (P>0.05). The highest nanohardness
(3.72±0.24) and elastic modulus values (61.15±2.59) were obtained for uncoated
archwires and the lowest nano-hardness (0.18±0.10) and elastic modulus values (4.84±0.65) were
observed for epoxy coated archwires. No significant differences in nano-hardness and elastic modulus
values were observed between the coated archwires (P>0.05). The adhesion of Streptococcus mutans
(MS) to the wires was significantly greater than that of streptococcus sobrinus (SS). The epoxy coated
wires demonstrated an increased adhesion ofMSand SS and the uncoated wires demonstrated
decreased biofilm adhesion. The Spearman correlation test showed thatMSand SS adhesion was
positively correlated with the surface roughness of the wires. Conclusion. The different surface coatings
significantly influence the roughness, nano-mechanical properties and biofilm adhesion parameters
of the archwires. The evaluated parameters were most influenced by epoxy coating followed by PTFE
and rhodium coating. A positive correlation was detected between surface roughness and biofilm
adhesion.

• رقم المجلد: 5
• مجلة/صحيفة: Mater. Res. Express
• الصفحات: 026511