In-office Bleaching With a 2-day Interval Between Sessions: Tooth Sensitivity
In-office Bleaching With a 2-day Interval Between Sessions: Tooth Sensitivity
The calcium containing 35% hydrogen peroxide gel employed in this study can be re-applied 2 days after the first bleaching session without increasing the bleaching-induced tooth sensitivity
The in-office bleaching uses 35% hydrogen peroxide gel which is applied in 2 to 3 sessions usually with one week interval between sessions, without a scientific and plausible reason for this recommendation (. The aim of this study was to evaluate the tooth sensitivity (TS) risk using a shorter interval between clinical sessions. Methods: In this randomized, single-blind study, 40 young patients with color C2 or darker were selected and randomly divided in two groups. In the 7-day group, two bleaching sessions with a 35% hydrogen peroxide gel (Whiteness HP Blue Calcium - FGM) were performed with a one-week interval and in the 2-day group, the same protocol was performed but with a 2-day interval. TS was recorded on a 0-10 visual analog scale up to 48 h after bleaching. The color evaluation was performed at baseline and 30 days after bleaching with a value-oriented shade guide and a spectrophotometer. The absolute risk of TS (%) was evaluated by Fisher´s exact. The TS intensity was evaluated by two-way repeated measured ANOVA and color changes (ΔSGU and ΔE) were evaluated by Student´s t-test (alpha = 5%).
Inclusion Criteria:
The participants should have:
At least six maxillary and mandibular anterior teeth caries-free. Without restorations on the labial surfaces. The central incisors should be C2 or darker according to a value-oriented shade guide (Vita Lumin).
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Exclusion Criteria:
Pre-existing anterior restorations. Pregnant/lactating. Severe internal tooth discoloration (tetracycline stains, fluorosis, pulpless teeth).
Taking any drug with anti-inflammatory and antioxidant action. Bruxism habits or any other pathology that could cause Tooth Sensbility (such as recession, dentine exposure).
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