Synthesis of Metal Ion-Histidine Complex Functionalized Mesoporous Silica Nanocatalysts for Enhanced Light-Free Tooth Bleaching
Resource
ACTA BIOMATERIALIA v.7 n.5 pp.2276-2284
Journal
ACTA BIOMATERIALIA
Journal Volume
7
Journal Issue
5
Pages
2276-2284
Date Issued
2011
Date
2011
Author(s)
Huang, Li-Chun
Hong, Chen-Yu
Wang, Shy-Guey
Hsu, Wei-Hang
Yamauchi, Yusuke
Hsieh, Chia-Jung
Lai, Juin-Yih
Abstract
Several metal ion-histidine complex functionalized mesoporous silica nanoparticles (MSN) were synthesized and utilized as efficient catalysts for enhanced and light-free tooth bleaching. Fe(II), Mn(II), and Cu(II) ions were successfully immobilized in histidine-functionalized MSN and their catalytic abilities against discoloration of a dye ( Orange II) in both test tubes and extracted tooth models were compared and discussed. Through direct observation of test tubes and calculation of mean color changes of extracted teeth we concluded that Fe(II)-his-MSN exhibited better catalytic competence than Mn(II)-his-MSN and Cu(II)- his-MSN because of its intrinsic redox ability. In test tubes Orange II was completely degraded within 6 h when Fe( II)-his-MSN was used as the catalyst. For the extracted tooth model the presence of Fe(II)- or Mn(II)- his-MSN significantly enhanced the efficacy of tooth bleaching for three regions, the enamel, outer dentin, and inner dentin, of stained teeth compared with H(2)O(2) alone. Furthermore, unlike current tooth bleaching techniques that need an LED or laser to catalyze H(2)O(2) bleaching, we demonstrated a light-free tooth bleaching system using Fe(II)-his-MSN as an efficient and reliable catalyst.
Subjects
Mesoporous materials
Silica nanoparticles
Tooth bleaching
Dye discoloration
Fenton-like reaction
Type
journal article
File(s)![Thumbnail Image]()
Loading...
Name
901.pdf
Size
23.23 KB
Format
Adobe PDF
Checksum
(MD5):ed2654b178a1f41fcf0c5455072e1fc3