Bleaching efficacy of ozone/hydrogen peroxide versus hydrogen peroxide/ozone application.

OBJECTIVE: To compare the efficacy of tooth bleaching after using ozone, before and after application of hydrogen peroxide (H2O2). METHOD AND MATERIALS: In total, 120 extracted teeth were assigned to three groups (n = 40 in each group). Teeth were bleached using 38% H2O2 application for 20 minutes followed by use of the ozone (delivered by means of the healOzone X4 device) for 60 seconds in group 1, via ozone for 60 seconds then 38% H2O2 for 20 minutes in group 2, and via 38% H2O2 for 20 minutes (plus normal air, delivered by the healOzone X4 device for 60 seconds) in group 3 (control). Teeth shades were assessed using a colorimeter before and after bleaching in each group. Significant statistical differences were recorded at P < .05. RESULTS: Teeth attained lighter shades (higher L* and lower b* values) subsequent to bleaching in all groups (P < .001). Groups 1 and 2 revealed similar bleaching results (P > .05), and showed lighter final teeth shades than group 3 (P < .05). CONCLUSIONS: Bleaching using 38% H2O2 for 20 minutes (combined with ozone for 60 seconds) produced similar results, regardless of applying the ozone before or after H2O2. Also, bleaching by combining ozone and H2O2 produced better tooth shades than bleaching by H2O2 only. Therefore, it might be practical to consider ozone when H2O2 is used for bleaching as this might potentially reduce treatment time and concentrations of H2O2, thus leading to improved bleaching results.

Effects of combining ozone and hydrogren peroxide on tooth bleaching: A clinical study.

OBJECTIVES: The purpose of this study was to evaluate the efficiency of bleaching after combining ozone and 38% H2O2 in comparison to the sole use of 38% H2O2. METHODS: Consecutive 26 participants (13 males and 13 females) were recruited into this study. They were randomly allocated into 2 groups (n=13 for each group). In group 1 (test group); the participants' upper anterior teeth were treated with 38% H2O2 for 20min then the teeth were exposed to ozone for 60s (healOzone(®) X4, KaVo Dental, Biberach, Germany). In group 2 (controls); the upper anterior teeth were treated with 20min of 38% H2O2 only. The shade of teeth was evaluated by recording the L* a* b* values and Vita Classic shades at study baseline and after bleaching in both groups. The statistically significant changes were set at P≤0.05. RESULTS: Tooth sensitivity and teeth shades were comparable between groups at study baseline (p>0.05). Controls reported more tooth sensitivity following bleaching (p<0.001). Teeth achieved better Vita shades, higher L* values (lighter shades), and lower a* and b* values (lighter shades) after bleaching in both groups (P≤0.05). However, teeth bleached with H2O2 and ozone achieved better Vita shades, higher L* values and lower a* values (lighter shades) than those bleached with H2O2 alone (p<0.001). Changes in b* values were not significantly different between groups. CONCLUSIONS: Bleaching with 38% H2O2 for 20min followed by 60s of ozone application would result in teeth with lighter shades than bleaching with 38% H2O2 alone.