Color Correction - JDT Unbound

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☛ quick takeAuthor Dmitry Nikonenko’s task was to neutralize additionalreddish-grey shade using the complementary colors theory. Hewas worried when he started this case because of the .7mmveneer thickness and the bright red color of the tooth core.However, the effect turned out to be very esthetic. By placingveneer on the abutment, he completely blocked undesiredcolor.The process of color correction is interesting mostly not from the point of viewof the clinical situation, but from the point of technical solution - the porcelainmulti-layer veneers were made in the technique of complementary colors.However, before speaking about the practical patterns of intense discolorationblocking, let us turn to the theory, knowledge of which allows us to solve similarproblems using non-traditional methods.For this, let us refer to the universal colormodel of Albert Henry Mansell, which heintroduced in 1915. It includes 3 parameters:1. Vertical axis characterizes brightness andis built from the white pole to the blackpole.2. Intensity is set by radius (the closer to thethe edge the larger).3. On the perimeter, the main shade isshown.1.Also, there is the fourth, spatial,component—transparence, which wasintroduced later, and which won't bediscussed now.Figure 1Briefly, the essence of Mansell's scale is thatthere are three main colors of substractivecolor synthesis: red, yellow and blue.By mixing the main colors, we get thesecondary ones: green, orange and violet.March 2011 Journal of Dental Technology 27
2. 3.4.5.Figure 2Let us imagine a triangle, in the corners of whichthe main colors are situated. The secondary colorsare formed between them.Figure 3Thus, the secondary color, which is complementaryto main one, is situated on the opposite toeach main color. Being positioned closely, thecomplementary colors are perceived sharper andmore dynamically, and complex grey, achromaticcolor can be produced by merging them. TheNoritake company has developed the methodwhich allows us to apply this effect in dentalpractice. Its essence is the following: the brightshade of the tooth, such as red of brown, can beblocked by the complementary color and thustransformed into the neutral grey, to which we mayapply the chosen color of final restoration.Figure 4Such a technique of blocking - neutralizing ofundesirable colors and absorbing filter creationis one of the methods offered by the ScreeningPorcelain Noritake.Figures 5-6The patient had intense discoloration of twocentral teeth, both teeth being vital. The decisionto use multi-layered veneers was made, to keepthe tooth's transparency and to neutralize the initialshade.Table 1Table 1Intensity of toothdiscolorationModeratediscolorationIntensediscoloration<strong>Color</strong> of preparedtoothBrownReddish-greyBrownReddish-greyRecommended porcelainModerate brown (M Brown)Moderate reddish-grey(M-Reddish-Grey)Intense brown (S Brown)Intense reddish-grey(S-Reddish-Grey)In the case of intense discoloration and brownshade of the tooth core, intense brown (s-brown)is used. If the discoloration is moderate, forexample, reddish-grey, the relevant tone is used,which is recommended in the table. The intensityof the discoloration, the color of prepared toothand recommended porcelain of four shades(complementary color) are specified there. Its useallows to resolve some problems using unorthodoxmethods—such as the case represented belowwhere technician had to compensate the intensetooth discoloration.28 Journal of Dental Technology March 2011
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Color Correction - JDT Unbound

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