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Changes in Color and Roughness with Laser Bleaching using different Peroxide Concentrations

Author: Fadi Al Hano
Journal: Journal of Oral and Dental Research مجلة طب الفم والاسنان ISSN: 23106417 Year: 2013 Volume: 1 Issue: 1 Pages: 6-12
Publisher: Iraqi Association for Oral Research الجمعية العراقية لبحوث طب الفم

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Abstract

Purpose: The use of different H2O2 concentrations for in-office bleaching has been questioned. Thus, theaim of this study was to evaluate the efficiency of laser bleaching on color changes and surface roughnessof bovine enamel with different peroxide concentrations. Materials and methods: Forty eight bovine incisors cleaned and labial surface polished up to #1200. Halfof them were artificially stained with black tea and divided into three subgroups and bleached according tothe concentration of H2O2 (15%, 25% and 35% ) (n=8). Specimens were bleached with laser hybrid system(DMC Whitening Lase II, Sao Paulo, Brazil). CIE Lab color system was used to evaluate color using VitaEasyshade Spectrophotometer (Ivoclar Vivadent, Liechtenstien). The remaining specimens were used forsurface roughness evaluation following bleaching. The enamel roughness (Ra) values were measured by StylusProfilometer (Suf-Corder SE 1200, Tokyo, Japan) and Atomic force microscopy (AA3000,Bosten,USA)before and after bleaching. Data were analyzed with Paired sample T-test to evaluate color changes andRa values at each concentration. ANOVA and Tukey test were used to evaluate the difference between thegroups with different bleaching agent concentrations. All tests were computed at 5% significance level. Results: Significant increases in degree of lightness (L*) values observed following bleaching at all concentrations.Different concentrations of peroxide produced significantly different Ra values. Bleachingwith 35% agent produced significantly higher L* value than 15% but similar to 25%. Exposing enamel tohigh peroxide concentration (25% and 35%) significantly increased Ra value in comparison to unbleachedenamel.Conclusion: Color changes and surface roughness of bovine enamel were influenced by hydrogen peroxideconcentrations of DMC laser bleaching system.


Article
The Effect of Remineralizing Toothpastes on Enamel Surface Roughness after Hybrid Laser Bleaching (An In vitro Study)

Authors: Bahar Jaafar Selivany --- Fadi Al-Hano
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2015 Volume: 27 Issue: 4 Pages: 1-7
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: one of the complications of power bleaching is surface roughness of enamel which increases thepossibility of post bleaching teeth discoloration. The aim of the present study is to evaluate the effect of toothpastecontaining nano hydroxyapatite, NovaMin and kin sense fluoride on surface roughness of human tooth enamel afterlaser bleaching with 35% hydrogen peroxide bleaching gel.Materials and Methods: Twenty human enamel incisors were cleaned and their labial surface polished up to #1200,then categorized into four equal groups; first group kept without bleaching as a control group, while the remainingthree experimental groups were bleached with 35% hydrogen peroxide, and each group treated with a restorepaste containing one of the following: nano hydroxyapatite, NovaMin, and Kin fluoride. Bleaching was done withlaser hybrid system (DMC Whitening Lase II, Sao Paulo, Brazil). Enamel roughness values assessed by an atomic forcemicroscopy (AA3000, Bosten, USA) before and after treatment with restore tooth paste.Results: Paired t-test used to compare the mean roughness values before and after treatment with each restorepaste. One-way analysis of variance and Duncan post hoc tests used to determine the differences between meanroughness values of the groups. A p-value of 0.05 or less considered a significant. The results showed a highlysignificant statistical differences of remineralization of all types of restore tooth pastes.Conclusions: Nano hydroxyapatite past exhibiting a higher ability to reduce the surface roughness after laserbleaching than other tested pastes.

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