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Lab Tribune Middle East & Africa Edition

lab tribune Dental Tribune Middle East & Africa Edition | March-April 20152C < Page 1C > Page 3C Multi is close to the one in the HT ingot, but with a little more brightness and opalcent radia- tion phenomenon, what literally solved the very difficult lack of brightness scenario we could face with the HT bleach colors. (Fig 10.) 4. Grinding off the sprues at- tachment in the Multi press is a little tricky to bring back the dis- tal contact aspect contour to the way you finished it in the wax, what I still like in the IPS e.max press, the vertical spruning and the fact of (pointed sprue attach- ment not Lined) that grinding off the sprue will not affect the sur- face contour. (Fig 9.) Characterizing & layering Referring back to our case photo and the detailed centrals’ incisal and mamelon effect, cutting backing was necessary if we want to mimic the centrals in the picture, so work flow was set as the following: - Cutting back on Multi pressed centrals to proceed with Cut- back technique, then layering just the incisal third with IPS emax Ceram powder. (Fig 12.) Fig. 12a Fig. 13 Fig. 12b Fig. 12c Aiham Farah. CDT Technical Training Consultant Near East & Orient Ivoclar Vivadent Email: aiham.farah@ivoclarvivadent.com Contact Information - Final contouring of the Multi pressed laterals to proceed with staining technique then using IPS e.max Ceram Shades and Essence; glaze with IPS e.max Ceram Glaze Flu. - Final contour of the emax press canine and premolars to proceed with staining technique then using IPS e.max Ceram Shades and Essence; glaze with IPS e.max Ceram Glaze Flu. Conclusion Ivoclar Vivadent’s new IPS e.max Press Multi is a real in- novation in the pressing tech- nology pyramid, for fabricating esthetic and multi-dimensional monolithic restorations with- out cutback or layering in most of the cases; because esthetic results are achieved in a single press sequence with subsequent glazing. The ingots feature a graduated level of shade and translucency similar to that of natural teeth, With a strength of 400MPa, the material is in- dicated for anterior and poste- rior crowns, veneers and hybrid abutment crowns. The ingots are available in one size and in the following shades: A1, A2, A3, A3.5, B1, B2, C1, C2, D3 and BL2. I advice using this solution for upper and lower centrals and laterals, where translucency level and esthetic is high, but strictly when the labial prepara- tion thickness is 1 mm and up, for the graduated level of shade and translucency in the ingot to be visible. I was intuitive to try the bleach shade out of the full shade range intentionally, be- cause I believed this ingot will solve the grayish problem gen- erated by layering enamel pow- der on any bleach color. And it really worked. Team players: efficiency and esthetics Modern zirconium oxides fulfil three major requirements of contemporary dental technology: high strength, esthetics and efficiency. The author describes the fabrication of monolithic posterior tooth restorations with the translucent zirconium oxide Zenostar Zr Translucent. By Dieter Knappe T his article is written in cel- ebration of zirconium ox- ide, a material which has firmly established itself in the dental laboratory over the past 15 years or so. If appropriately used, zirconium oxide restora- tions produce very strong and durable results. They also sat- isfy demanding esthetic require- ments due to their translucent properties. The following case study shows how monolithic zirconium oxide is effectively incorporated into the digital manufacturing chain to produce highly cost-effective dental res- torations without having to com- promise on esthetics. In the case presented, a wax-up was crafted which served as a basis for fab- ricating a provisional restoration (Telio® CAD for Zenotec, Wie- land Dental) and a permanent restoration (Zenostar Zr Trans- lucent, Wieland Dental) with one digital data set and CAD/ CAM milling equipment. Preoperative situation The patient presented to the dental practice with a fractured ceramic inlay restoration in tooth 26 which she wished to have replaced. The tooth had been restored many years previ- ously. Since tooth 25 and tooth 35 were discoloured as a result of root canal treatment, they were included in the treatment plan. The existing tooth structure of tooth 26, which had been pre- pared to accommodate the inlay in the past, was preserved to the best possible extent. The patient had very high esthetic expecta- tions and wanted the explicit as- surance that the crowns would look completely natural. None- theless, we decided to use a very efficient fabrication method in which monolithic restorations are produced with translucent zirconium oxide (Zenostar Zr Translucent). Three options are available for fabricating mono- lithic restorations with this ap- proach: 1. milling, sintering, glazing (ef- ficient, cost-effective); 2. milling, sintering, individuali- zation with ceramic characteri- zation materials, glazing; 3. milling, individualization with infiltration liquids, sintering, glazing (highly esthetic). We chose to pursue the third method, which would be very cost-effective as a result of the benefits offered by the digital workflow. Advanced zirconium oxide Zirconium oxide is more than twice as strong as other dental ceramics, and it exhibits excel- lent mechanical properties. Due to its translucent characteristics, the material has been fulfilling highly esthetic requirements for quite some time now. The mate- rial is used to fabricate full-con- tour (monolithic) restorations and frameworks that provide a base for individualized veneers. The zirconium oxide material Zenostar Zr Translucent shows excellent light transmission. In this system, efficiency teams up with esthetics to offer impres- sive results. The wide range of discs, the matching stains and the brush infiltration technique allow lifelike effects to be im- parted to restorations in a rela- tively short time. Preparation The following aspects were par- amount in preparing teeth 25, 35 Figs 3 and 4: CAD/CAM images of the scanned wax-up and the PMMA-based long-term temporaries (Telio CAD for Zenotec) Figs 1 and 2: Manual waxing up of the crowns Fig.5: The milled crowns before they were trimmed from the PMMA disc Fig.6a: The completed long-term temporaries made of PMMA on the model and ... Fig.6b: ... in the mouth and 26 for the ceramic restora- tions: avoidance of sharp edges and observation of a minimum wall thickness. The benefits of using zirconium oxide include the material’s high strength and as a consequence, the fact that very little tooth structure needs to be removed. The cavity in tooth 26 already showed exten- sivepreparation.However,inor- der to properly anchor the new restoration, re-preparation was shown to be inevitable. The cav- ity had to be extended towards the buccal aspect. Despite being very thin, the buccal cusp walls were in an acceptable condition. The main objective was to main- tain the tooth by restoring it with a crown. Following the prepa- ration phase, impressions were taken of the upper and lower jaws and the occlusal relation- ship was established. Then, the clinician fabricated the provi- sional restoration chairside with the help of a customized tray. Fabrication of long-term tem- poraries According to the treatment plan, the patient would have to wear long-term temporaries for a pe- riod of several months. In order to fabricate these restorations, a

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