Analysis of Enamel Surface and Shear Bond Strength with Orthodontic Bracket at Different Time Intervals After Bleaching Treatment
Background: This study aimed to analyze the enamel surface and shear bond strength (SBS) with orthodontic brackets at different time intervals after bleaching treatment with 35% hydrogen peroxide (HP). Methods: A 35% HP was applied to enamel surfaces, which were assigned to group 0. The tooth spec...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
The Korean Society of Dental Hygiene Science
2025-06-01
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| Series: | 치위생과학회지 |
| Subjects: | |
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| Summary: | Background: This study aimed to analyze the enamel surface and shear bond strength (SBS) with orthodontic brackets at different
time intervals after bleaching treatment with 35% hydrogen peroxide (HP).
Methods: A 35% HP was applied to enamel surfaces, which were assigned to group 0. The tooth specimens were then immersed
in artificial saliva for 24 hours (group 24h), one week (group 1w), and one month (group 1m). The control group did not undergo
any bleaching. The enamel surface was evaluated using a gloss meter, quantitative light-induced fluorescence-digital, a
three-dimensional optical surface profilometer, a surface microhardness tester, and a scanning electron microscope (SEM). The
SBS test was conducted using a universal testing machine and the bond failure modes were observed.
Results: The gloss and microhardness of the enamel surface increased with immersion time (p＜0.05). Fluorescence loss and
surface roughness decreased with increasing immersion time (p＜0.05). The SEM images of the test groups showed a rough
pattern, similar to that of group 0, which became more apparent as the immersion time decreased. SBS increased with increasing
immersion time (p＜0.05). Group 1m did not show a significant difference compared with the control group (p＞0.05).
Conclusion: The time interval after tooth bleaching significantly affects the enamel surface and SBS of teeth with orthodontic
brackets. This study highlights the optimal waiting time before applying orthodontic brackets after 35% HP bleaching to improve
bond strength and treatment outcomes. |
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| ISSN: | 2233-7679 |