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ePaper created 2015-08-28, 13:01:48 | version 1.38.0
I 25 case report _ veneering technique I cosmeticdentistry 2_2015 The basic principles of the freehand technique have notchanged.However,thetechniquehasbeensim- plified and improved. The following example shows some of the most important steps. _Application After defining the indication and the diagnostic goal, the teeth that required restoration were de- fined. In this case the caries was to be treated from canine to canine in the maxilla and the shape, shade andaxialtiltsweretobecorrected(Fig.2).Theenamel shells are available in various sizes and two differ- ent translucent shades: a neutral ‘Universal shade’ and a light ‘White Opalescent’ shade, which is more suitable for a youthful mouth. With the appropriate dentine composite positioned behind the shells any desired combination of shades can be created. The tooth shape is selected with a COMPONEER Contour Guide (Fig. 3). The shape in the Contour Guide is placed over the tooth that is to be restored, with the blue-transparent colour offering an opti- mum contrast to the selected tooth. The enamel shells can also be test fitted on the teeth or tem- porarily cemented with uncured composite to as- sess where and how much the composite veneer shell requires customisation. Corrections that re- quire grinding can also be marked at this stage. A rough disc at low speed without water cooling is the best tool for correcting the shape of the shell. In general,alargershapeispreferredtocovermarginal regions and to allow as much scope as possible for customising the shape. The specially developed holder is ideal for han- dlingtheshell(Fig.4).Thelabelontheprimarypack- agecanberemovedandfiledwiththepatientfilefor documentation.Dryworkingisessentialforthebest results. The classical rules do not apply for prepara- tion. The minimum coating thickness of 0.3 mm means that the surface only requires minimal re- duction (Fig. 5). In some cases, the enamel is simply roughened and there is no defined preparation. Etchant Gel S is applied to all enamel and dentine areas for bonding and evenly distributed with the brush.Thecuringtimeonenamelis30to60seconds and on dentine 15 seconds, then the area is sprayed for 20 seconds. In the basic principle, the Total Etch method is used with One Coat Bond, which is easily filled and offers better wetting with a nanohybrid composite. The One Coat Bond is applied evenly on enamel and dentine and left to cure for at least 20 seconds. Then transparent matrices are placed in the interdental spaces to prevent adhesion of the teeth. Thebondedsurfacesarepre-curedfor10seconds. The unique microretentive surface of COMPONEER (2 μm) (Fig. 6) reduces the conditioning on the inside of the shell because additional processes such as grit-blasting and silanisation are not required. One Coat Bond is applied directly with the brush and does not require light-curing. The result in combi- Fig. 5_Minimal preparation. Fig. 6_Microretentive surface (23 mPa adhesion). Fig. 7_Adaptation of composite on shell. Fig. 8_Press-on with holder and adaptation with MB5 spatula. Fig. 9_Individual shaping. Fig. 10_Harmonised front with COMPONEER. Fig. 10 Fig. 7Fig. 6Fig. 5 Fig. 9Fig. 8