Comparative in vitro study of two tooth bleaching systems: colour change and enamel surface effects
Date
2010-01-22T09:46:20Z
Authors
Grundlingh, Andries Adam
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Abstract
This in vitro study compares tooth bleaching and consequences of tooth
surface effects of Ozicure Oxygen Activator (O3, RSA) with Opalescence Quick
(Ultradent, USA) tooth bleaching.
One hundred and thirty six teeth (canines, incisors and premolars), which were
caries free, had no surface defects and within the colour range 1M2 and 5M3.
Teeth were randomly divided into the three experimental groups: Opalescence
Quick, Ozicure Oxygen Activator and control. The three experimental groups
received three treatments of one hour each over three consecutive days.
Tooth colour was assessed using the VITAPAN 3D MASTER TOOTH GUIDE
(VITA, Germany) and VITA Easyshade (VITA, Germany). A randomized block
design was used to assess tooth colour change. A General Linear Models test
for analysis of variance for a fractional design with significance set at P<0.05
was used. Both bleaching methods significantly lightened the teeth, visually
(P<0.0001) and digitally (P= 0.013). Tooth colour change was seen after the
first hour of tooth bleaching; thereafter there was little or no benefit. The tooth
type played a significant role in tooth colour change (visually P=0.0416 and
digitally P=0.004). The quality of the spectrophotometer may account for the
different results found compared to the tooth guide.
Scanning electron microscopy showed no effect of enamel loss following
bleaching. Atomic force microscopy showed a 2.5 rougher enamel surface with
Opalescence Quick.
Description
Thesis (M.Dent.), Faculty of Health Sciences, University of the Witwatersrand, 2009
Keywords
colour change, tooth bleaching, enamel surface effects, visual tooth colour assessment, digital tooth colour assessment