Effects of Laser Irradiation and Tooth Mousse on Tooth Hypersensitivity after Office Bleaching: A Non‑Randomized Clinical Trial

Abstract

Background: This study aimed to assess the effect of laser irradiation and Tooth Mousse on tooth
hypersensitivity (TH) after office bleaching (OB).
Materials and Methods: This clinical trial, parallel‑design split‑mouth nonrandomized was
conducted on 30 patients requiring OB. After scaling and fabrication of a custom tray, 35% hydrogen
peroxide was applied on all teeth, and 940 nm diode laser (10 W, Class IV, 110–240 V) was irradiated
to the upper and lower right quadrants. Laser in off mode was used for the left quadrants. Bleaching
agent was then reapplied. After completion of bleaching, a custom tray containing tooth Mousse was
placed on the maxillary arch while the tray was used without the paste for the mandibular arch.
A visual analog scale was used to assess the degree of TH at 15 min and 24 h after OB. Data were
compared using t‑test, paired t‑test, and analysis of variance. Significance level was set at α = 0.05.
Results: Comparison of TH at 15 min and 24 h after OB showed a significantly lower TH score
in the left upper quadrant (tooth Mousse alone) than right upper quadrant (both laser and Tooth
Mousse) (P < 0.05). The TH score in the right upper quadrant was significantly lower than that in
the right lower quadrant (laser only) (P < 0.05). The mean TH score in the left upper quadrant was
insignificantly lower than that in the left lower quadrant (no intervention) (P > 0.05).
Conclusion: The use of 940 nm diode laser for OB increases the postoperative TH. The application
of Tooth Mousse can effectively decrease TH after OB with/without laser irradiation.
Key Words: Clinical trial, laser, tooth bleaching, Tooth Mousse