Effect of High Light Intensity Bleaching Protocol versus Descending Light Intensities Bleaching Protocol on Post Bleaching Teeth Sensitivity: A Randomized Clinical Trial

Abstract

AIM: The study aimed to compare teeth sensitivity and shade after bleaching protocol with descending different light intensities versus bleaching protocol with the same high light intensity.
 MATERIAL AND METHODS: Sample size was twenty-four patients. Each group consisted of twelve patients. Group, I patients received bleaching protocol of descending different light intensities. Group II patients received bleaching protocol with the same high light intensity; both groups used the same home bleaching gel kit for seven days according to manufacturer instructions and protocol. Baseline records were digital photographs, teeth sensitivity and teeth shade for 12 anterior teeth. Teeth sensitivity was assessed using five points verbal rating scale and Standardized 100 mm Visual analogue scale after 1 day, after 2 days and after 1 week. Teeth shades for twelve anterior teeth were recorded by VITA Easy Shade V (VITA Zahnfabrik H. Rauter GmbH & Co. KG, Germany) after 1 week by VITA Easy Shade V. Mann-Whitney test (non-parametric test, 2 independent samples) was used to compare teeth sensitivity between both bleaching protocols at each period. A paired t-test (parametric test, 2 related samples) was performed to compare the colour change in shade guide units (SGU) and ∆E values within high light intensity bleaching protocol. While Wilcoxon Signed-Rank test (non-parametric test, 2 related samples) was used to compare colour change light intensities bleaching protocol. Comparison of bleaching effectiveness (∆SGU and ∆Ediff) between both bleaching protocols was performed by the Mann-Whitney test.
 RESULTS: Descending light intensities protocol showed a lower teeth sensitivity than high light intensity protocol after 1 and 2 days. There was no teeth sensitivity reported at 1-week post-bleaching. Regarding the teeth shade, descending light intensities protocol had a little higher effect on colour change in shade guide units (SGU) than high light intensity protocol effect. Both bleaching protocols showed there was no significant difference in ∆SGU recorded after bleaching between high and descending light intensities protocols.
 CONCLUSION: Descending different light intensities protocol showed a lower teeth sensitivity than high same light intensity protocol. Descending light intensities protocol had a little higher effect on colour change in shade guide units (SGU) than high light intensity protocol effect.

In-Office Power Bleaching for the Aesthetic Management of Dental Fluorosis

“…According to Moghadam et al, 42.9% of patients had sensitivity following at-home bleaching, whereas 57.1% had sensitivity after power bleaching [ 18 ]. Furthermore, Kabil et al examined how a "descending light intensity protocol" affected post-bleaching sensitivity, finding that it did so at a lower level than the traditional "high light intensity protocol" [ 19 ]. To lessen post-bleaching sensitivity, desensitizing chemicals could be used [ 20 ].…”

Conservative esthetic management of severe dental fluorosis with in-office power bleaching

“…[ 18 ] Kabil et al . studied the effect of “descending light intensity protocol (high intensity, followed by moderate and finally low intensity)” on post-bleaching sensitivity and found lower sensitivity with this protocol as compared to conventional “high light intensity protocol.”[ 19 ] Desensitizing agents may be used after bleaching to reduce post-bleaching sensitivity. [ 20 ]…”