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Dental Tribune Middle East & Africa Edition No. 3 2015

lab tribuneDental Tribune Middle East & Africa Edition | May-June 2015 1C 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 Translucent Zirconia... Can it be esthetic enough for the esthetic zone? By Aiham Farah, CDT, Syria T he ongoing evolution of restorative materials is bringing dentists more options than ever before to achieve the most desirable mix of properties. In the field of lab- oratory-fabricated restorations, clinicians and their lab partners have long been seeking to bal- ance aesthetics, strength, and ease of use. While the concepts of strength and ease of use are well under- stood, aesthetics are of course more subjective, yet can still be discussed in some objective terms. When we speak of aes- thetics in this category, we typi- cally mean two things: color and translucency. In order to best mimic natural tooth structure, a restoration must reflect, scatter, and absorb light similar to the way that a natural tooth does. Lithium disilicate has proven popular in recent years, thanks to its high performance in the aesthetic category. Today, Zenostar Zirconia is one of the top ranked high esthetic Zirconia, in our current test on the material below. I used all the > Page 3C Fig. 1. Fig. 2. working techniques instructed by the material manufacturer (staining tech on one set, and cut-back tech on the other), but I implemented my own experi- ence in order to pull out its es- thetic optical properties, and dis- play it for you in this case report, so you can be the judge whether Fig. 3. Fig. 4. it’s esthetic enough for the es- thetic zone! What is Zenostar? Zenostar materials are partly sintered (chalk-like) zirconia disks, in both pre-shaded and non-shaded versions (Fig. 1), when sintered to full density, it demonstrates strength of more than 900 Mpa ((MO. 1150mpa Fig. 5. / T. 1200mpa), and fracture toughness of double that of the glass infiltrated ceramic. Milling is carried out with an enlarge- ment factor of approx. 20-25%. Zenostar offers a versatile range of processing options, providing maximum flexibility and reli- ability. For instance, IPS emax ZirPress can be pressed onto it, or IPS emax Ceram can be veneered onto it. Or even the shade and stains (from IPS emax Ceram kit or Zenostar Art Modul) can be used to characterize a full contour restoration to their high translucency and enhanced es- thetic properties. What’s the concept behind the disks (T & MO)? Zenostar T discs are particu- larly suited for the manufac- ture of monolithic restorations, supplied in pre-shaded basic shades, allowing easy reproduc- tion of all the 16 shades and 4 bleach (Fig.2). The fact that Zenostar disks are matched to the IPS emax press ingot range, is important to the success of full dental rehabili- tation, (for instance; IPS emax veneers on anterior teeth and Zenotar full contour bridges on posterior teeth), to guaran- tee the shade match. IvoclarVi- vadent made it simple by having relevant coding for the Zenostar T (Translucency) to the emax press LT (Low Translucency). Never the less, Zenostar MO (Medium Opacity) disk is also available and particularly suit- able for esthetic frameworks on discolored preparation and metal components, where a full masking even with a thin layer is guaranteed. 1st set: Working steps after the milling (Fig. 3). Brush infiltration Tech - With the correct grinding instrument, we separate the milled object. With no vibration. - With a fine rubber polisher (white rubber for example), we smooth out the attachment point of the holding pins. - With a polishing brush disk (LISKOforexample),wesmooth out the milling fades exist on the outer surface - With a soft brush (Micro brush 1 2 3 4 5 6 7 8 Tel.: +4232353535 | Fax: +4232353360 1234 5678

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