Abstract
Background:Dental bleaching has been increasingly sought out to improve dental aesthetics, but it may cause changes in dental enamel.Objective: To assess the influence of different time intervals on bleaching gel applications with regard to the Microhardness (MH) and Surface Roughness (SR) on dental enamel.Material and Methods:Forty bovine incisors were randomly divided into two groups (G1 and G2) and both were bleached with 35% Hydrogen Peroxide (HP35) (n=20; G1: seven-day interval and G2: two-day interval). The MH and SR tests were performed before bleaching (T0) and after the first (T1), second (T2), and third (T3) bleaching gel applications. The specimens were stored in artificial saliva between each application (37°C). The data were analyzed using the student’s t-test (p ≤ 0.05) for dependent samples.Results:The reduced time interval (two days) led to a significant reduction in MH, while MH was not affected during the seven-day interval. The SR results increased regardless of the bleaching gel application time interval.Conclusion:The decreased time interval of two days between bleaching gel applications caused changes in MH but did not influence the SR of dental enamel.
Highlights
Nowadays, dental bleaching is one of the most popular esthetic treatments in dentistry due to its fast satisfactory results and safety when performed by a trained professional
The reduced time interval led to a significant reduction in MH, while MH was not affected during the seven-day interval
The Highest Mean MH observed was in G1 (T0) (293.75 KHN), and the lowest was in G2 (T2) (205.08 KHN)
Summary
Dental bleaching is one of the most popular esthetic treatments in dentistry due to its fast satisfactory results and safety when performed by a trained professional. High-concentration peroxide gels (35-38%) were developed to be used in office, especially when home bleaching is not the treatment of choice. Hydrogen peroxide acts as an oxidative agent breaking carbon double bonds present in dark pigments into hydroxyl groups, which have a lighter appearance. This reaction goes deep through the organic enamel matrix and affects its morphology [1, 2]. Several in vitro and in vivo studies have been carried out to detect possible damages to the dental substrates after bleaching treatments. The oxidizing agents present in bleaching gels are able to modify the chemical composition of the. Dental bleaching has been increasingly sought out to improve dental aesthetics, but it may cause changes in dental enamel
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