Effects of different bleaching application durations on enamel in terms of tooth color, microhardness, and surface roughness

Abstract

The aim of this research was to assess the color differences (∆E00), Vickers microhardness, whiteness index, and surface roughness values of different durations of bleaching the enamel. One hundred and eight teeth were utilized for color evaluation, roughness, and microhardness (n = 36). Teeth were assigned to three groups (n = 12) based on the durations of the bleaching application. Bleaching agent was applied for 20 minutes in group 1, 40 minutes in group 2, and 60 minutes in group 3. The color was measured with a Vita Easyshade Advance 4.0 spectrophotometer before applying the bleach, and 24 hours, 7, and 14 days after bleaching application. The CIEDE2000 and whiteness index for dentistry values were calculated. The microhardness and surface roughness values were obtained before application and 7 and 14 days after application. Data were analyzed using two‐way ANOVA and post‐hoc LSD tests Group 3 had the largest color and whiteness changes. The whiteness index for dentistry values were statistically significantly increased, considering baseline measurements within all groups (P < .05). For the Vickers micohardness values, in group 3, a statistically significant difference was observed among baseline, and 7 days after application (P < .05). However, the surface roughness values showed no significant difference in any measurement (P > .05). According to this research in all groups, effective whitening was accomplished. Based on the results evaluated for whiteness, color alteration, microhardness, and roughness, the optimal bleaching duration of application was in 40 minutes.

The Potential Teeth Bleaching and Halitosis Prevention Effects of Pediococcus inopinatus THK-30, a Kimchi-Derived Lactic Acid Bacterium: In Vitro Study

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Influence of polishing after bleaching on color change, enamel surface morphology and sensitivity: a randomized clinical trial

“…Preliminary studies have investigated the concentration of peroxides, the time and form of application to achieve e cient whitening [2]. However, according to some studies, this treatment may result in changes in the surface roughness of tooth enamel [3,4].…”

Interdisciplinary treatment in office bleaching for discoloration teeth with altered passive eruption: a case report

“…During the last few years, the increase in a person's appearance causes the increase of the popularity of aesthetic treatment. 1,2 Nowadays, individuals are not satisfied with a healthy teeth and desires to have a captivating smile. Teeth discoloration is one of the aesthetic problems on teeth that can be caused by either intrinsic or extrinsic factors.…”