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ePaper created 2018-02-16, 10:54:19 | version 1.38.0
Microtexture (small surface irregularities related to the apposition and calcification of the enamel matrix during tooth formation, pits, vertical lines and perikymata). 3. Lustre or degree of shininess of the tooth also known as gloss (Figs. 10 & 11). Lustre will set the amount of the light reflection of the crown surface and it is as important as colour and contour in recreating the natural appearance.63 It is to be noted that lustre is not related to age and is genetically and congenitally determined. Naturomimetic layering technique (NLT) Natural teeth are complex in structure and hard to simulate due to the distribution of colours through the enamel and dentins. Hence, in NLT it is important to have a detailed examination of the colour, opac ity, translucency, texture, surface gloss and pres ence of any special characterisation of the tooth to be restored. In NLT, the desired result is achieved by applying the correct thickness of clear or trans lucent enamel group of material over a saturated and opaque dentine group of material which pro duces a double effect layer and hence helps to mimic natural optical properties of the tooth. There are various clinical situations during enamel rejuvena tion which are guided by the type of tooth defects (anatomy, brightness/colour and contour) and de sire level of the patient. Depending on the clinical situation, the clinician should choose one of the above NLT techniques. Naturomimetic layering technique is based on new layered shading classifi cation64 and is divided into the following types for clinical conveniences. NLT—Mono-layer In the monolayer technique, the tooth defects are restored using only a single group of material. The layering procedure does not entail the use of opaque or any effect group. However multiple naturomimetic layering technique | Smile Style Personality charateristics Suitable for D—Smile Style Goal oriented, competitive, direct, extrovert, driven, ambitious, strong willed—“Just Do It” type Entrepreneurs, sales management, legal or litigation, operation management etc. related professionals I—Smile Style People and person oriented, talkative, spontaneous, enthusiastic, warm, persuasive “Have Fun Doing It” type Advertisement, marketing, public relations, training, hospitality, tourism, retail sales etc. related professionals S—Smile Style Stable, dependable, conservative, loyal, relaxed, passive, patient “Do it Together” type C—Smile Style Careful, detail oriented, logical, organised, diplomatic, conventional, exacting, “Do it Right” type Teaching, education, finance, economics, human recourses, support services, customer services, manufacturing etc. related professionals Accounting, auditing, engineering, medicine, research and development, agriculture, computer programming etc. related professionals shades of a similar group of material may be used at different thicknesses (Fig. 12). Table 3: DISCover Smile Style— personality characteristics. NLT—Bi-layer The Bilayer technique is used when both dentine and enamel are affected and two different groups of materials are used to replace dentine and enamel. Even in this layering technique, opaque and effect group materials are not used. After choosing the correct shade, opacity, and trans Fig. 10: Macro-texture with low gloss. Fig. 11: Micro-texture with high gloss. Fig. 12: NLT—Mono-layer. Fig. 13: NLT—Bi-layer. Fig. 14: NLT—Tri-layer. Fig. 15: NLT—Mono-Complex layer. Fig. 16: NLT—Bi-Complex layer. Fig. 17: NLT—Tri-Complex layer. Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 cosmetic dentistry 1 2017 19