There have been numerous researches on Ozone application in dentistry; yet the data regarding its whitening effect are very limited; therefore, the present study was conducted to compare the bleaching effect of ozone with office bleaching.
Methods:
15 maxillary premolar teeth were divided mesio-distally and bucco-lingually. The sections were then dyed with tea by Suleiman Method, and were divided into three groups, each comprising 15 sections. The samples were prepared as follow; Group I: bleached with 35% Hydrogen peroxide according to the manufacturer’s recommendation(Polo Office, SDI, Australia), Group II: underwent Ozone treatment for 240 seconds using OZOTOP machine (MECTRON/Swiss) then kept for 24 hours in the incubator at 37±1ºc; and, Group III: Hydrogen Peroxide gel (35%) (Polo Office, SDI, Victoria, Australia) was applied 1-2 mm thick followed by 80s ozone treatment, then the gel remained for 8-minutes over tooth surface in a sealed container. The whole procedure was repeated three times. The color change of the samples was obtained pre- and post bleaching through a digital photography, and then the data entered to the Photoshop software and Lab Index. The data were analyzed through Randomized ANOVA and Tukey Test.
Results:
The color change in the Ozone Group (Group II) was significantly lower than those in two other groups (p<0.001). There was no significant difference in color change of Groups I & III (p=0.639). Moreover, the results obtained in L, a, and b were similar to the findings obtained from DE among the groups.
Conclusions:
Although ozone produced a statistically significant color change but the hydrogen peroxide gel showed more prominent color change. In addition there was no difference in color change of teeth when hydrogen peroxide gel is used alone or in combination with ozone gas.