PURPOSE: @entity6701 ( @entity3759 ), a photocatalyst, is known to decompose various organic compounds under ultraviolet (UV) illumination by generating various radicals, which is useful for killing bacteria. The purpose of the present study was to evaluate the photocatalytic bactericidal effects of variously treated @entity702 surfaces on @entity885 sanguinis SL1. MATERIALS AND METHODS: Specimens were fabricated from grade 4 commercially pure @entity702 , 10 mm in diameter and 2 mm in thickness. Three different surfaces were prepared: anodized (AO) at 270 V, @entity15296 ( @entity15296 ), and machined (MA). Surface analysis was performed using confocal laser scanning microscope, scanning electron microscopy, and thin-film x-ray diffractometry. The antibacterial activities were assessed by comparing adhesion and survival rates of @entity885 on various surfaces under UV illumination. RESULTS: The AO surface was rougher than the @entity15296 and MA surfaces. The AO surface showed @entity3759 peaks of anatase structure, while the @entity15296 surface showed @entity3759 peaks of rutile structure in x-ray diffractometry. @entity15296 and AO surfaces showed significantly decreased bacterial adhesion under UV illumination (AO and @entity15296 > control, @entity70077 ). In addition, bacterial adhesion decreased more significantly with extended UV illumination time. With respect to survival rates of bacteria, AO and @entity15296 showed a significant reduction over time compared to MA. The photocatalytic bactericidal effect was maximal on the AO @entity702 , followed by @entity15296 and MA. CONCLUSIONS: The photo-induced bactericidal efficacy of @entity3759 films is dependent on their surface characteristics.

Comparison of ultraviolet light-induced photocatalytic bactericidal effect on modified XXXX implant surfaces.

@entity885 :: ('1305', 'Species') :: ['Streptococcus', 'S sanguinis'] @entity15296 :: ('MESH:D019553', 'Disease') :: ['heat-treated', 'HT'] @entity70077 :: ('AO > MA', 'ProteinMutation') :: ['AO > MA'] @entity6701 :: ('MESH:C009495', 'Chemical') :: ['Titanium dioxide'] @entity702 :: ('MESH:D014025', 'Chemical') :: ['titanium'] @entity3759 :: ('CHEBI:32234', 'Chemical') :: ['TiO2']
@entity702 :: (MESH:D014025,Chemical) :: ['titanium']
