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Effect of Pre- and post-bleaching on the color change of resin infiltrated enamel lesions versus sound bleached Enamel: In vitro study

Thesis

Last updated: 06 Feb 2023

Subjects

-

Tags

Restorative & Esthetic Dentistry

Authors

Abou-El-Azm, Hasan Ahmad

Accessioned

2018-08-26 05:29:03

Available

2018-08-26 05:29:03

type

M.Sc. Thesis

Abstract

This study was conducted to evaluate the effect of pre- and post- bleaching using 3 different in-office bleaching systems on the color change of resin infiltrated enamel lesions compared to sound bleached enamel. A total of 30 bovine incisors were used in this study. Teeth were divided into 3 groups (10 each) according to the utilized bleaching techniques (T1- Laser activated, T2- Chemically activated and T3- Light activated. Three standardized windows A, B and C (5mm x 7mm) were created on the labial surface of each tooth, one of which (Window A) served as sound enamel (control). The other two windows were subjected to demineralization by immersion in demineralizing solution at pH 4.5 for 72 hours at 37°C. Following that, Icon® resin infiltrant was applied to window C. Baseline window preparation was followed by in-office bleaching to the 3 windows using the 3 different systems. Laser-activated bleaching using LaserWhite™20 bleaching system and Epic™10 Diode Laser device, Chemically-activated bleaching using Dash in-office whitening system and Light-activated bleaching using Philips Zoom whitening gel Following bleaching, Icon® resin infiltration was then applied to the demineralized bleached window to represent the pre-bleached resin infiltrated enamel. Color parameters (L*, a*, b*) and color difference (ΔE) were measured and calculated using a spectrophotometer after baseline preparation, bleaching and final Icon® application. Results of this study showed that regardless of the bleaching technique, bleaching showed insignificant difference in ΔE for sound enamel (T1= 6.48±0.38, T2=6.11±0.33 & T3=6.39±0.42) and resin infiltrated enamel (T1=6.54±0.33, T2=6.36±0.41 & T3=6.58±0.35). Pre-bleached resin infiltrated enamel showed statistically significant lower ΔE value than sound enamel and post-bleached resin infiltrated enamel (T1= 5.30±0.33, T2= 5.44±0.43 & T3= 5.49±0.51), yet the color difference is clinically insignificant. Regarding the effect of different bleaching techniques; the 3 different bleaching techniques showed no significant difference amongst them in the value of color change induced in any of the tested enamel windows. Hassan Ahmed Hassan AboulAzm Thesis Abstract Effect of Pre- and Post-Bleaching on the Color Change of Resin Infiltrated Enamel Lesions versus Sound bleached Enamel: InVitro Study 2 Faculty of Oral and Dental Medicine – Cairo University – 2016 It was concluded that Icon® resin infiltrant did not hinder bleaching and pre-bleached resin infiltrated lesions yielded clinically acceptable color change compared to sound enamel, and post-bleached resin infiltrated lesions with no different in bleaching outcome amongst different bleaching protocols applied

Issued

1 Jan 2016

DOI

http://dx.doi.org/10.21473/iknito-space/39583

Details

Type

Thesis

Created At

28 Jan 2023