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ePaper created 2018-02-16, 10:54:19 | version 1.38.0
naturomimetic layering technique | Adolescent teeth (Figs. 7a–c) At about the age of 20 years, the enamel is less white, enamel translucency becomes visible due to gradual wearing off of the opaque top layers of the young enamel. There is a presence of enamel surface mi crotexture and low gloss; dentinal lobes are still covered by enamel but slightly blue and orange hues become visible. Middle-aged teeth (Figs. 8a–c) There is reduced enamel surface micro and mac rotexture, and an increased surface lustre. There Cosmetic enamel restorations can be successfully utilised to correct minor tooth misalignments, changes in brightness, and enhance the contour of a tooth. As described earlier, enamel surface loss generally affects visual alignment, brightness and contour of the teeth, which negatively affects the overall smile aesthetic. With enamel being a thin outer layer of a tooth, the loss of enamel surface is generally as sociated with the exposure or loss of dentine sub stance. Hence restoring natural enamel requires careful analysis of its dentinal substrate loss in terms of its depth, colour and type. Fig. 8a Fig. 8b Fig. 8c Fig. 9a Fig. 9b Fig. 9c Figs. 8a–c: Middle-aged teeth. Figs. 9a–c: Aged teeth. is also increased enamel translucency; blue and or ange hues become more prominent and dentine is normally exposed in the region of the incisal edges. Aged teeth (Figs. 9ac) There is an increased enamel translucency, changes in hue to bluish to lilac and grey, a lack of enamel surface microtexture, with considerably reduced macrotexture. There is a high surface lustre, dentin is relatively darker and less opaque than of mid dleaged teeth, and on the incisal edges, the under lying dentine structure appears as a flat wall. Restoration strategy After having a better understanding of the inherent characteristics of dental tissues to light incidence, it allows a more artistic restorative approach where the light can be manipulated in each increment of the resin, thus resulting in vivid and extremely natural restorations.55, 56 Restoration strategies should follow proper under standing of defects, right selection of restorative materials and their proper application, finishing, texturing and polishing. Selection of restorative materials based on optical properties Natural dentine and enamel have a rich composi tion and details. Where dentine confers the basic colour to the dental element, or the hue, this colour is not entirely perceived by the observer, because the enamel modulates the chroma and the value of hue according to its greater or smaller thickness and surface texture and level of polishing. Enamel does not actually change the hue (colour), but only con fers a greater or lesser saturation or chroma accord ing to its thickness.56, 57 Placing the correct thickness of enamel layer over dentine can positively increase or decrease the value (brightness) giving the restoration its vivacity. If the restoring tooth has lost both the enamel and dentinal tissue, then proper colour selection of dentine and enamel resin is paramount. It is because the percentage of light transmission on enamel is approximately 70.1 per cent, which gives this tissue translucent characteristics. On the other hand, the percentage of the dentine is 52.5 per cent, which makes it more opaque.58 Hence, in order to obtain natural lifelike restorations, more transparent res ins should be used for the fabrication of the artificial cosmetic dentistry 1 2017 17