Effect of diode laser and light activated in-office bleaching versus home bleaching on enamel surface roughness: In vitro study

Document Type : Original Article

Authors

1 Lecturer in Conservative Department, Ahram Canadian University, cairo,egypt

2 Associate professor in conservative Department , Ahram Canadian University, Cairo, Egypt

3 Lecturer in conservative Department, Ahram Canadian University, 6th of October, Egypt

Abstract

Abstract:
Aim: evaluate the enamel surface roughness before and after diode laser activated bleaching, light activated bleaching, and home bleaching.
Materials and Methods:
A total of 30 human anterior teeth were placed in self-cured acrylic resin with the buccal surface facing upward. Surface roughness of all groups at baseline was measured. After measuring baseline surface roughness, the samples were divided into three groups, group (I) White smile Light whitening AC (32% hydrogen peroxide) was used plus activation with Diode laser light source, group (II) White smile Light whitening AC (32% Hydrogen peroxide) was used plus activation with LED source and group (III) White smile home whitening bleaching system (35% carbamide peroxide) was used. All samples were kept in distilled water after bleaching, and enamel surface roughness was tested again after 24 hours. A sample representing each group was randomly selected to observe the roughness of the enamel surface under a scanning electron microscope.
Results: All three treatments resulted in a statistically significant increase in enamel surface roughness (p < 0.05 for all groups). Where group I (in-office bleaching activated using diode laser) was significantly different from group II (in-office bleaching activated using LED light) and group III (home bleaching), while Group II and group III showed no significant difference from each other.
Conclusions: All bleaching protocols have a deleterious effect on enamel surface roughness varied according to material composition, concentration, exposure time, and activation mode.
Key words: Diode laser, hydrogen peroxide, bleaching, surface roughness.

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Egyptian Dental Journal
Volume 71, Issue 3 - Serial Number 5
Conservative Dentistry and Endodontics
July 2025
Pages 2751-2759

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