[Effect of cold-light bleaching technique on human permanent teeth enamel surface].
OBJECTIVE
To study the effects of the cold-light bleaching technique on crystals and microstructure of the dental enamel.


METHODS
The human premolars extracted for orthodontic reasons were treated by a standard cold-light bleaching procedure. After the treatment, all samples were detected by high resolution micro-area X-ray diffractometer, Fourier transform infrared spectroscope and scanning electron microscope.


RESULTS
After the permanent teeth were treated with cold-light bleaching technique, the enamels' crystal dimension, crystallinity decreased and irregular surfaces and shallow disk pits appeared.


CONCLUSIONS
The cold-light bleaching technique could lead to the changes of crystals and microstructure in the surface layer of dental enamel.
Huang
Jian-wen
JW
State Key Laboratory of Oral Diseases, Sichuan Sichuan University, Chengdu 610041, China.
Shi
Xin-chang
XC
Zhou
Jing-lin
JL
Li
Wei
W
D001641:Bicuspid; D003743:Dental Enamel / Q000528:radiation effects* / Q000648:ultrastructure; D006801:Humans; D008027:Light; D008855:Microscopy, Electron, Scanning; D017550:Spectroscopy, Fourier Transform Infrared; D014073:Tooth Bleaching / Q000379:methods*