Lab Tribune Middle East & Africa Edition

lab tribuneDental Tribune Middle East & Africa Edition | March-April 2015 1C > Page 2C IPS e.max® PRESS MULTI THE WORLD’S FIRST POLYCHROMATIC PRESS INGOT • Monolithic LS2 restorations showing a lifelike shade progression • Exceptional combination of strength, esthetics and efficiency • For crowns, veneers and hybrid abutment crowns • Coordinated with high-precision Programat press furnaces • Maximum cost effectiveness in the press technique • • • all ceramic all you need www.ivoclarvivadent.com Ivoclar Vivadent AG Bendererstrasse 2 | 9494 Schaan | Liechtenstein Tel.: +423 235 35 35 | Fax: +423 235 33 60 LIFELIKE ESTHETICS – EFFICIENTLY PRESSED Firsthand Experience With Polychromatic LS2 ingot... IPS e.max Multi… because it works Fig. 1 Fig. 2 Fig. 3a Fig. 3b Fig. 4 Fig. 5 By Aiham Farah P olychromatic lithium dis- ilicate pressing ingot—IPS e.max Press Multi. The 400MPa ingots feature a gradu- ated level of shade and translu- cency, with chroma and opacity higher in the cervical and dentin regions, and more translucency in the incisal areas. Here under I am sharing with you my firsthand experience on this ingot, from a material and technology point of view, before deciding whether it’s your ma- terial of choice to use in a real clinical case or not, you need to experiment the optical proper- ties, and learn how to handle the masking, shade matching and color dimensions, and how to get the best esthetic results out of it. Here I decided to choose a unique feminine smile of hol- lowed celebrity (Imogen poots), and try to mimic it using a com- bination of our new IPS e.max press Multi ingot BL2 (for cen- trals & Laterals) AND the tradi- tional IPS e.max press ingot LT BL2 (for Canines and 1st premo- lars). Horizontal sprueing technique - From a (Mesial-Distal) angle of view. We align the more narrow side of the Wax Pattern Sprue with the occlusal or incisal area of the waxup. For the labial surface of our wax restoration to be al- ways parallel to the Wax pattern Sprue surface, so the ceramic flow path is not directed toward the die. This eliminates lateral pressure on the investment die. - From a (Labial) angle of view. We Align our wax restoration vertically with the center of the Wax Pattern Sprue. The long axis of the Wax Pattern Sprue to be parallal to the long axis of the restoration; this way, the materi- al layers (Dentin-Incisal) main- tain their horizontal relationship during pressing. (Fig 3a.) Controlling translucency ratio The ability to manipulate the sprued restoration on the sprue base is a fabulous option to con- trol translucency level, If more translucency is desired, the res- toration and Wax Pattern may be lowered by up to 2mm Max, by cutting a small notch from the wax pattern, in order to reach more incisal portion from the ingot to the pressed restoration. (Fig 4.) From the natural teeth in the picture we notice high level of translucency in the incisal third of the two centrals which do not exists in the two laterals, what required lowering the position of the centrals so more incisal layer will reach the pressed res- toration from the Multi ingot, however the positioning for the two laterals kept the same ac- cording to the instruction for use for pressing IPS e.max Multi from Ivoclar Vivadent. (Fig 6.) Canines and 1st premolars were sprued vertically in the tradi- tional way of spruing the IPS emax press and prepared in another ring base to be pressed later. (Fig 7.) In a close comparison between the conventional IPS e.max Press (low translucency) ingot and IPS e.max Press Multi, I no- ticed the following remarks: 1. The dentine layer exists in the Multi is equivalent to the one in LT ingot, maybe the masking ca- pability is even a little better, es- pecially after testing the centrals on ND1 & ND2, they maintained the same shade brightness they have in BL2 shade tap with no ND influence. (Fig 11.) 2. The thickness played an im- portant role in boosting the brightness level and positioning the final shade in between the BL2 & BL1. (Fig.11.) 3. The Incisal layer exists in the Fig. 6 Fig. 8 Fig. 7 Fig. 9 Fig. 10 Fig. 11 Tel.: +4232353535 | Fax: +4232353360

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