In Vitro Bleaching Study With a 20% Hydrogen – Peroxide System
Abstract
The effects of an in-office tooth whitening procedure (Zoom 2, Discus Dental) were evaluated on standardised Tetracycline discoloured teeth to determine their usefulness as acceptable representative models for future bleaching research. The hypothesis was that the teeth discoloured by the in vitro technique would whiten in the same manner and to the same degree as unstained teeth. Changes in brightness (L*), chroma (C*) and hue (H*) were compared between baseline and the final evaluation period. The Chlortetracycline, Doxycycline and Minocycline stained groups demonstrated a decrease in brightness, whereas the control group demonstrated a significant increase in brightness (Holm-Sidak Multiple Comparisons Test; all comparisons to baseline; p < 0.05). All four groups demonstrated a significant reduction in chroma (Holm-Sidak Multiple Comparisons Test; all comparisons to baseline; p < 0.05). No significant changes in hue were noted. Bleaching of the standardised tetracycline stained teeth is not a true representation of what occurs in vivo since the experimental staining is of a physical nature rather than biological. However, the results of the present study support the conclusion that Zoom 2 provides a positive whitening effect of the experimental teeth as a reduction in chroma and/or an increase in brightness were noted.
Refrence:
Daniel C.N. Chan, Albert Kwok-Hung Chung, William D. Brownin and So-Ran Kwon, Dental Tribune Science 2010.
Link:
