CDEN0310

I 27 industry report _ IPS e.max Press I cosmeticdentistry 3_2010 Preparation of the mock-up A silicone matrix was fabricated on the basis of the wax-up, which was based on the findings of the aesthetic analysis. The temporary restora- tions were fabricated with the help of the matrix from a self-curing, flowable Bis-GMA-based composite. This allowed us to discuss the restoration beforehand with the patient, who provided her input and approved of the resto- ration (Fig. 2). Preparation In order to keep the depth in check and ob- serve the biological concept, the drill was placed directly on the mock-up. With this procedure, a uniform thickness of approximately 0.5 mm is achieved on the basis of the volume of the final restoration.1 After removing the preparation key (mock-up), the presence of larger, non-prepared enamel areas is observed. In the present case, the treatment protocol was slightly varied in view of the cervical preparation margins: usu- ally, the preparation margins are located above the gum line for veneer preparations; in this case, however, the margins had to be designed sub-gingivally (Fig. 3). This approach was chosen for various rea- sons: in order to eliminate the black triangles, meet the biological requirements (cleaning and soft edges) and consider the biomechanical properties of the ceramic (prevention of non- supported areas in the ceramic), only one single contact surface with a soft transition from the edge of the root to the margins of the contact surface could be designed to mask the missing papillae (Fig. 4). The all-ceramic veneers were fabricated with the IPS e.max Press (MO1) lithium-disilicate glass-ceramic material and the incisal third was veneered with IPS e.max Ceram (both Ivoclar Vivadent). The pressed veneers, which showed a minimum thickness of 0.3 mm, feature a high stability and outstanding accuracy of fit on the one hand and excellent light-optical properties on the other. Try-in of the IPS e.max Press veneers After removing the temporary restorations, all veneers were tried in simultaneously. This enabled the overall appearance to be visualised. Subsequently, the accuracy of fit was checked. Variolink Veneer Try-In paste (Ivoclar Vivadent) was used for this procedure in order to simulate Fig. 7Fig. 6 Fig. 3_Preparations with sub-gingival margins in the proximal region. Fig. 4_Checking the relation between the preparations and the volume of the final restoration with the help of a silicone matrix. Fig. 5_Isolating individual teeth in order to achieve optimum bonding. Figs. 6 & 7_Lateral view of the IPS e.max Press veneers from right (Fig. 6) and left (Fig. 7). Fig. 5Fig. 4 Fig. 3