Documentation Summaries - Implantium & Medical Company

Purpose:
Titanium dioxide (TiO ), photocatalyst, is known to decompose various organic compounds under ultraviolet(UV)
illumination by generating various rdicals, which is useful for killing bacteria. The purpose of the present study was
to evlaluate the photocatalystic bactericial effectd of vaiously treated titanium surfaces on Septococcus sanguins SL1.
Material and Methods:
Specimens were fabricated from grade 4 commercially pure titnium, 10mm diameter and 2mm in thickness. Threre
different surfaces were prepared: anodized (AO) at 270 BV. head-treatd(HT) and mechined (MA). Surface analysis
was performed using confical laser scanning microscope, scanning electron microsopy nd thin-film X-ray-diffractometry.
The antibacterial activities were assessed by comparing adhesin and survival rates of S sanguinis on various
surfaces under UV illumination.
Results:
The AO surface was rougher than the HT and MA surfaces. The AO surface showed TiO peaks of anatase structure,
while the HT anatase structure, while the HT surface showed TiO peaks of rutile structure in x-ray diffractometry.
HT and AO surfaces showed significantly decreased bacterial adhesion under UV illumination (AO and HT > control,
AO> MA). In addiition, bacterial adhesion decreased more signigicantly with extended UV illumination time.
With respect to survival rates of bacteriam, AO and HT showed a significant reduction over time compared to MA.
The photocatalytic bacteriidal effect was maximal on te AO titanium, followd by HT and MA.
Surface Treatment 38