cosmetic dentistry_ beauty & science International Edition

case report _ ceramic veneers I was performed using 14 µm-thick articulating paper with a fine, pear-shaped drill bit (red- coated) mounted on a 1:5 increasing handpiece on a micromotor. Subsequent to completion of equilibration, the corrected surfaces were polished. Again, diag- nostic models were created for the wax-up, and for planning the final scope and type of restora- tion. On the basis of the wax-up, a mock-up was made in the patient’s mouth to check the function and acceptance of the shape of the restoration (Figs. 2a & b). Treatmentplan Thepreparationoffeldspathicceramicveneers on the maxillary incisors (teeth 12, 11, 21 and 22) was planned in order to alter the shape of the incisors, while maintaining the original length and colour of the teeth. Preserving the natural colour of the teeth allowed for application of a more transparent and thus more aesthetically favourable ceramic, since fluoride discolouration is present only within the superficial layer of enamel, which can be removed during prepa- ration. After another clinical analysis, based on the diagnostic mock-up and consultation with the patient and dental technician, it was decided to perform power whitening of the maxillary canines (teeth 13 and 23) in order to make the existing discolouration on the labial surfaces the samecolourastherestoftheteeth.Thiswasmade possible by predetermining the aetiology of the discolouration to be dental fluorosis. Discoloura- tion caused by demineralisation of enamel would have become even more visible after the whiten- ing treatment. Maxillary canine whitening was performed selectively using a 16 % BriteSmile preparation (Philips Oral Healthcare) activated by a dedicated light (two sessions of 20 minutes each). The key issue for the mechanics and durability of ce- ramic veneers is not to cross the amelodentinal junction. Preparation of the stumps was limited to alignment and rounding of the incisal edges and to elimination of the most visible discolou - ration (Figs. 3a–c). The gingival area was not subjected to chamfer preparation owing to the possibility of shading the feldspathic veneers even up to 0.1 mm. The preparation was per- formed using a red-coated tip on a 1:5 increasing handpiece on a micromotor with water-cooling. After preparation, the enamel surface was polished with Sof-Lex discs (3M ESPE). Then a double-layer one-step impression was taken with polyvinyl siloxane material (BISCO, Inc.). Because the enamel surface preparation was performed supragingivally, no retraction cord was placed before taking the impression. Fig. 11_Prepared stumps from teeth 13 to 23. Stump preparation was limited to smoothing the surface of the enamel and the removal of existing composite restorations. Fig. 12_The finished veneers after beingreleasedfromtherefractorymass. Figs. 13a–c_Comparation of the teeth before and after treatment. I 21cosmeticdentistry 1_2014 Fig. 11 Fig. 12 Fig. 13b Fig. 13c Fig. 13a CDE0114_18-25_Michalik 11.06.14 14:05 Seite 4