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| technique naturomimetic layering entails the use of opaque group of materials but does not require effect resin and the opaque layer should be covered with a suitable thickness of the correct shade of dentine and translucent enamel layer (Fig. 14). NLT—Complex layer In NLT, any restoration that demands the use of effect group of materials either singly or in com bination with enamel, dentine or opaque materials is considered as a complex restoration of that particular layer technique, such as MonoComplex layer, BiComplex layer or TriComplex layer. The use of effect resin (to create opalescence, orange or yellow hues, stain, enamel crack, white spot etc.) requires detailed colour analysis and mapping be fore application. This kind of restoration is basically done in the incisal third area of the tooth, where the range of translucency and opalescence is greater (Figs. 15–17).67 The level of polish (smoothness) of a surface changes the chromatic perception of the com posite resins and is inversely proportional to luminosity.68 The more polished the surface, the larger the light transmission, and consequently, the less luminosity (brightness).45 Conversely, the lack of polishing (matte finish or presence of more microtexture) causes the surface to become more re flective, making the restoration appear more luminous.68 Conclusion Cosmetic dentistry is one of the fastest growing trends in oral healthcare today. This has been fuelled by increased public awareness, an increasing in pa tients’ affluence, as well as the desire for beautiful, stylish and healthy smiles. An aesthetic smile has recently become one of the fundamental demands of patients visiting dental practices._ Editorial note: A list of references is available from the publisher. contact Dr Sushil Koirala is the Chairman of and chief instructor at the Vedic Institute of Smile Aesthetics. He maintains a successful private practice in Kathmandu, Nepal. He can be contacted at drsushilkoirala@gmail.com. Fig. 18 Fig. 18: Naturomimetic layering technique (NLT) step by step. lucency materials, it is important to consider the thickness of the materials to be layered to mimic natural dentine and enamel. Perception of higher chroma and opacity is related to an increase in thickness.45 The handling of composite layers is crucial for obtaining the desired chromaticity, translucency, and opacity.65 It is to be noted that hightranslucent enamel resin may create a greyish restoration with a lower value; when the thickness of translucent enamel resins increases, the value decreases and chroma increases. However, by increasing the thickness of the dentine group (opacious composite) both value and chroma of the restoration increase66 (Fig. 13). This article originally appeared in the MiCD Clinical Journal, 2016, Sept–Nov; 01(1):6-21. Reprinted with permission from Vedic Institute of smile Aesthetics (VISA). NLT—Tri-layer This is basically used to restore tooth defects where major colour modification is desired, for example, a nonvital discoloured tooth. The layering technique 20 cosmetic dentistry 1 2017