Efetividade inicial e após 15 dias de clareamento exógeno variando-se a técnica e os agentes clareadores

Abstract

The objective of this study is to evaluate in vitro the effectiveness of two techniques of exogenous dental bleaching in association to two bleaching agents (at home + carbamide peroxide at 10% and activated by LED + hydrogen peroxide at 35%). Twenty crowns of human premolar, split up in the mesio-distal sense, were divided into two groups (n =10). Initially, digital standardized photographs were taken, following coordinated x and y of the teeth, in the pre-staining period (IR - initial reading). Next, the specimens were stored for 30 days in artificial saliva at 37 _C with tea kills, Coke, Periogard and Gatorade. After this period, new photographs were taken (RAICS - reading after immersion in coloring solutions) and the teeth were divided into groups, according to the bleaching process they were submitted: GI - daily application of carbamide peroxide at 10% for four weeks; GII - three consecutive applications of hydrogen peroxide at 35% activated by LED. After that stage, the specimens were again submitted to photographic takings, one being accomplished immediately after bleaching (R0 - reading after bleaching) and the other one 15 days after (R15 - reading 15 days after bleaching). After definition of the coordinate x and y which corresponds to the center of the dental element, the photographic images of the teeth were analyzed in Software Adobe Photoshop® in which the color readings were achieved according to the scale R, G, B and K. The results showed that the coloring substances used were able to promote the staining of the teeth in significant levels, and just the home technique bleaching associated to the carbamide peroxide at 10% was able to promote the bleaching of the specimens in significant levels in the initial (R0) period as well as after a period of 15 days.