The ‘dark halo’ present in the enamel surrounding anterior composite restorations spoils the appearance of the restoration and is very difficult to control. This article offers an explanation for its causes and proposes clinical solutions. The behaviour of the transmitted light may be handled through the use of an ‘internal mirror’ made with a shade of opaque white composite resin and through the right choice of the enamel shade, seeking sufficient diffusion of the light. Another innovative concept is that of ‘chroma balance’, which may be generally achieved through the use of more or less intensive dentine shades, different from the one which was originally chosen.
Clinical Relevance: From study of the behaviour of light in bodies, and especially in teeth and restorations, it may be possible to find the cause of the ‘dark halo’ effect, which relates to the optical property called the ‘destructive interference of the light’.
Article
In order to be effective in restorative dentistry and to achieve the aesthetic goals we seek, several procedures must be understood and mastered. Among these, a knowledge of illuminant light and a way of handling how it behaves is of crucial importance.1
There are several aspects of the behaviour of light that need to be understood:
By studying, understanding the application and finally comprehending the role each one of these properties plays, the outcome of treatment should more precisely relate to restorations in terms of their optical behaviour.3
There are other fundamental elements to be considered, such as texture, shine, reflection patterns, anatomy (at all levels) and, of course, function.4
However, returning to the topic of the ‘behaviour of light’, it is necessary to analyse the property that this article focuses on: ‘the destructive interference of light’.
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