Abstract
ABSTRACT Objective to analyze the surface roughness and color stability of the composite resin after surface treatment with the aluminum oxide discs and subsequent exposure to the Advanced Teeth Whitening Strips. Methods 20 specimens of the Filtek Z350XT restorer (3M®) were prepared and daily subjected to home bleaching for 30 minutes during 14 days. A precision rugosimeter was used in order to verify the roughness by means of 3 random readings in the same direction in each sample. For color stability the CIELAB system (L*, a*, b* values) was used through the spectrophotometer (MINOLTA CR -321, Japan). The means of the test specimens as well as the mean of each group were calculated using the random readings. Data statistical analysis were performed by ANOVA- analysis of variance. The level of significance was set at 5% (p ≤ 0.05). Results Roughness did not present great numerical variations. No statistically significant difference between the means obtained concerning the surface roughness of the composite resin with p = 0.44 was observed. However, it was found that there was a statistically significant difference between the means obtained in relation to the color stability of the composite resin, p=0. 007. Conclusion It was concluded that pre-contoured strips containing 6% hydrogen peroxide do not have a significant adverse effect on the roughness of Z350XT (3M®) resin. However, it was also concluded that according to the color stability analysis performed, there may be an indication of the restoration replacement after the bleaching treatment, due to their color change.
Highlights
Since the introduction of home bleaching by Haywood and Heymann in 1989, this trend has become quite popular and aesthetics in Dentistry has been increasingly more noticeable [1]
It was concluded that according to the color stability analysis performed, there may be an indication of the restoration replacement after the bleaching treatment, due to their color change
Simple treatment, and usually used by professionals to achieve an aesthetically pleasant smile [2].Types of bleaching methods include in-office bleaching performed by the dentist, at home performed by the patient under the supervision of the professional; and the association of these techniques, part performed in the office and part at home [3].Bleaching occurs by oxidation reaction caused by the decomposition of hydrogen peroxide into oxygen and perhydroxyl, the carbamide peroxide breaks down into hydrogen peroxide and urea which again breaks down into ammonia and carbon dioxide
Summary
Since the introduction of home bleaching by Haywood and Heymann in 1989, this trend has become quite popular and aesthetics in Dentistry has been increasingly more noticeable [1]. Disposable pre-contoured strips containing the hydrogen peroxide bleaching agent in concentrations ranging from 6 to 14% was introduced in Brazil, in 2013. These have been widely used due to the lower concentration of the bleaching agent, shorter application time and simple use [4]. Products withhigher than 3%, concentrations of carbamide peroxide and hydrogen peroxide, which includes whitening strips [5] are under Anvisa assignment.Composite resins- very popular among dentists- have significantly been developed and widely used in restorative treatments. The roughness impairs aesthetics; causes restorationstaining; plate accumulation; caries and gingival irritation [1]
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