Abstract
Tooth darkening compromised oral aesthetics andbleaching is a conservative and efficient method toreestablish it. The aim of this study was to assessthe action of 35% hydrogen peroxide in specimenspigmented with different substances. Twenty fragmentsobtained from chicken eggshell measuring 0.5 x 0.5 cmwere randomly divided into 5 groups (G1, G2, G3, G4and G5) with 4 specimens each. These were previouslyphotographed and pigmented respectively with coffee,cola-based soft drink, wine, beetroot and tobacco fora 48-hour period. In groups 1, 2 and 3, the specimenswere directly immersed respectively into the first threesubstances. In group 4, beetroot was mixed with waterto obtain a solution. In group 5, the specimens weresubmitted to tobacco smoke by the same period. Thegroups were again photographed and then submittedto bleaching with 35% hydrogen peroxide andphoto-activated by laser for 20 min. After the finalphotographs, the images were analyzed thorugh AdobePhotoshop CS5 software. It was observed that wine mostpigmented the specimens (33.34%), followed by coffee(10.35%), beetroot (9.56%), cola-based soft drink(8.85%) and tobacco (0.61%). The bleaching action wasmore effective on the specimens of G1 (93.9%) and G2(91.55%), followed by G3 (71.09%), G4 (62.74%) andG5 (57.38%). It was concluded that the methodologywas efficient in comparing the effectiveness of thebleaching agent on the pigments tested. The specimenspigmented with tobacco were those which exhibitedthe greater resistance to bleaching. Taking intoconsideration the use of this biological material, furtherstudies are necessary to simulate the effects of manyother substances onto tooth enamel.KeywordsBleaching; Discoloration; Hydrogen peroxide; Egg shell.
Highlights
Patients have searched by a harmonious aesthetically smile comprising clearer and healthier teeth
The pigment amount found in the specimens at the beginning of the experiment and after the impregnation with the chromogenous substance and the bleaching procedure can be seen in Graph 1
By using the formulas proposed in the methodology of this study, the analysis of the darkening degree of the specimens showed that the fragments from G3 were the most pigmented with 33.34% of pigments, followed by G1 with 10.35%, G4 with 9.56%, G2 with 8.85% and G5 smoke) with, 0.61%
Summary
Patients have searched by a harmonious aesthetically smile comprising clearer and healthier teeth. This has increasingly aroused interest of dentists who have sought for new products and restorative techniques. Tooth bleaching is an effective and non-invasive method being the first choice for teeth presenting color alteration. Tooth darkening may occur because of either intrinsic or extrinsic pigments due to a complex physical and chemical interaction between the chromogenous agent and the tooth compromising the oral aesthetics [1,2,3,4]. Black extrinsic stains may still be a side effect of the administration of ferrous sulphate for the treatment of irondeficiency anemia [6] and occur because of the presence of chromogenic bacteria, therapeutic agents or metallic compounds [7]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
