Aim: The aim of the study is to evaluate the effectiveness of two different in-office bleaching agents, Zoom2 (Z) and Boost (B), regarding color stability 1-week, 2-week, 1-month and 2-month periods after treatment.

Materials and methods: A total of 60 patients each of whom had anterior teeth of shade A3 or darker were randomly selected from the pool of patients attending the Dental Hospital at the University of Dammam. For the Z group (n = 30), a light activation unit was used to activate the bleaching agent. While for group B (n = 30), the whitening gel was used without light activation. The shades measurements were taken using spectrophotometer before the treatment, after 1-week, 2-week, 1-month, and 2-month periods.

Results: Analysis of variance repeated-measures (ANOVA) test was applied to compare the mean effect of color change between the materials on various follow-up measurements. Wilcoxon signed rank test was applied to compare the mean effect of color change within the material on various follow-ups. A p-value ≤ 0.05 was considered statistically significant. At the termination of the study, the statistical analysis of the data indicated that both products efficiently lightened the color of the teeth but Z group is more efficient than B group in different follow-up intervals.

Conclusion: Both tested whitening systems demonstrated efficient tooth whitening. Z system is more efficient and stable than B system at 2 months’ interval.

Clinical significance: Zoom2 bleaching system is more efficient and stable than Boost bleaching system after 2 months’ follow-up.

Keywords: Bleaching systems, Clinical study, Spectrophotometer.

How to cite this article: AlSheikh R, El-Embaby AE. Spectrophotometric Comparison of Effectiveness of Two In-office Bleaching Agents with/without Light Activation: A Clinical Study. J Contemp Dent Pract 2018;19(6):637-641.

Source of support: This study was supported by research grant No. 2012134 from the University of Dammam Research Fund.

Conflict of interest: None