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146 rev port estomatol med dent cir maxilofac. 2021;62(3):141-149

Figure 13. Opal Dam in the maxilla was removed using Figure 15. Pre ‑treatment of a Group 1 case – with
a clamp. Spectroshade images on tooth 23.

Figure 14. After 10 minutes, the varnish was easily Figure 16. Post ‑treatment of a Group 1 case – with
removed using an ultrasonic scaling device, and the Spectroshade images on tooth 23.
step presented in Figure 11 was repeated five
additional times (10 minutes each), giving a total
whitening procedure time of 60 minutes. In the end,
Opal Dam was totally removed. 6

Results
A total of 20 patients were selected and randomly assigned
ple comparison test with a superiority limit at a WPT value of to each group (three males and seven females per group),
0.72. Calculations were performed with a power of 80% and α with a mean and SD of 23.3±2.3 and 21.6±3.0 years of age
of 5%. for Groups 1 and 2, respectively. There were no statistically
All collected data were analyzed using IBM SPSS version significant differences in color coordinates and WI mean
D1
25 (IBM Statistics, Inc. Chicago, IL, USA). Results were present- values before the bleaching treatment (results depicted in
ed as mean and standard deviation (SD) of CIE L*a*b* color Table 3).
parameters and WI with the respective ΔE and ΔWI for all All treatments occurred without drop-outs, and both
D,
00
D,
12 anterior teeth and teeth darker than A3.5. Sample normal- groups presented statistically significant differences (P<0.01)
ity was evaluated with the Kolmogorov-Smirnov test, resulting for tooth color coordinates after bleaching procedures, with
in a normal distribution. Statistical analysis was performed by an increase in L* mean value and a decrease in a* and b* mean
parametric tests with a paired t-test conducted to analyze in- values. Additionally, the whiteness index results were statis-
tragroup differences in CIE L*a*b* and WI values and an inde- tically significant (P<0.01), presenting higher mean values
D
pendent t-test conducted to determine intergroup differences after treatment in both groups. Bleaching effectiveness was
in ΔE and ΔWI . A statistical significance level of α=0.05 was verified with the ΔE surpassing the AT in 81.7% of cases (90
00 D 00
considered. teeth in Group 1; 106 teeth in Group 2) while the ΔWI was
D