Dental Tribune Pakistan Edition No.1, 2017

2017(cid:9) Pakistan Edition(cid:9)DENTAL TRIBUNE(cid:9) 13 January Mastering the art of dental technology By Marc Chalupsky I NGAPORE/BAD BOCKLET, GERMANY - Singapore and Germany are about 10,000 km apart. As Singaporean dental technicians and dealers discovered at this year's International Dental Exhibition and Meeting (IDEM), the world’s most comprehensive range of dental laboratory products can be found at DT&SHOP, located in the town of Bad Bocklet about 100 km north-west of Nuremberg. Owing to the company’s latest inventory and delivery systems, orders arrive in Singapore and other Asia-Pacific countries within three working days. DT&SHOP has big plans for this thriving dental technology market.(cid:9) According to a recent Transparency Market Research report, the Asia- Pacific dental laboratory market is projected to expand at a substantial rate in the next five years. Driven by rising dental tourism and a growth in the number of dental laboratories, the domestic sector will also see an increase in export demand for orthodontics, periodontics, crowns, bridges and implants. Local dealers have yet to be prepared to satisfy demand, particularly regarding CAD/CAM technology. As one of the world’s main dental laboratory suppliers, DT&SHOP will soon provide a convenient solution: “We will work closely with these smaller and medium-sized dealers in the region by giving them access to the company’s product and delivery system,” said Dr Nicolas Rohde, head of the Digital and International Division. “This will also include advanced marketing and educational support. The new digital possibilities allow us to work with partners and clients anywhere and anytime.” With a 96 per cent product availability, eco- friendly packaging and competent customer service, the company has proved itself to be a reliable partner for local dealers.(cid:9) This year, DT&SHOP took the next Sneek peak into the DT&Shop main building: In the foreground the DT&SHOP catalogue, in the background an artwork by a Vietnamese artist. step towards securing a major position in the Asia-Pacific market, by exhibiting at IDEM Singapore 2016. With a 50 m² booth, the company showcased its wide range of dental laboratory products from leading manufacturers. As a dental producer itself, DT&SHOP also presented the new FINOCAM A5 five-axis milling unit and the FINOSCAN RELATION high-quality optical 3-D scanner. “Most dental technicians at IDEM were impressed by our FINO CAD/CAM solutions. In fact, our FINO brand covers most of the dental l a b o r a t o r y n e e d s , i n c l u d i n g orthodontic boxes, partial denture alloys, duplicating and addition-curing silicones, modelling wax, relining units, porcelain brushes and much more,” explained Roer. “I think that we have quite successfully mastered the art of offering the complete range of dental technology.”(cid:9) Artists and dental technicians share a talent for colour, aesthetics and technical complexity. It therefore c o m e s a s n o s u r p r i s e t h a t DT&SHOP’s corridors are filled with masterpieces, inspirational and vivid artworks from around the world. Roer has had a passion for art for most of her life. Her latest acquisition, a set of paintings from Canada, is awaiting a suitable space in one of the Continued on Page 15 Barriers to cleft lip ... Continued from page 04 necessary adhesion is obtained by sandblasting the surface. Obtaining chemical adhesion is the third requirement.(cid:9) Based on extensive research, Kern is convinced that chemical adhesion can only be achieved by using MDP. His first publication on this subject dates back to 1998. It was the use of PANAVIA (Kuraray Noritake), which did indeed contain MDP, that made it possible to achieve durable synthetic resin bonding to zirconia after sandblasting. Sandblasting (cid:9) Dentists and dental technicians are apparently somewhat averse to sandblasting,‡ as evidenced by the extensive research conducted in an attempt to find an alternative. No such alternative has yet been found. Efforts have been made to fuse a silica layer on to the zirconia to improve bonding, but, according to Kern, the results of this procedure—the Rocatec method, f o r e x a m p l e — h a v e b e e n disappointing. Nor is the silanisation of a zirconia restoration effective, because zirconia does not react to silane. In order to achieve durable cementation of zirconia restorations, dentists therefore have no other option than the purchase of a sandblasting device. (cid:9) Sandblasting can be carried out in a small cabin to prevent the surrounding area of the practice from being affected. Soft air abrasion is Minimum wall thickness of KATANA † Maintain 0.8 mm thickness of pressed ceramic in all areas. When trimming the zirconia framework, the framework should be at least 0.4 mm. carried out at 0.5 bar, while tight air abrasion is performed at 2.5 bar. The exact pressure is not all that crucial to the adhesion of the zirconia, provided that it is between 0.5 and 2.5 bar.§ Kern advises sandblasting at a pressure of 1 bar, so that the surface to be bonded becomes somewhat rougher without this being visible to the naked eye. Obviously, the part of the restoration that does not require bonding, such as the outside of a veneer or the dummy of an adhesive bridge, has to be protected from the effect of the abrasive particles. It is also advisable to apply a colourant (waterproof marker pen) to the area to be sandblasted prior to the procedure. The colour disappears during sandblasting, making it easy to check that the entire adhesive surface has actually been abraded. Adhesive monomer (cid:9) The restoration surface can be cleaned using alcohol after the sandblasting process. This step is optional. If the alcohol becomes contaminated, for example, by saliva residues, the effect will be negated, because the sandblasted surface would be contaminated as well. The choice of the fixation procedure is relatively simple, provided MDP is used. MDP is not present in glass ionomer cements, which are also sometimes used for the cementation of zirconia restorations because of their ease of use. Kern advises against using these. It is clear from all of the studies that the composite cements containing MDP provide the most durable results. The oldest known cement in this category is PANAVIA EX, which was introduced in 1983. The optimised PANAVIA V5 was presented recently as the single one cement for all cementation indications guaranteed to work according to a predictable procedure. All of the cements and bonding materials produced by Kuraray Noritake contain MDP.(cid:9) Possibly because Kern conducted his research in Maryland in the US for two years, he has recorded remarkable results with adhesively cemented Maryland bridges (adhesive bridges). It has also become apparent that, most of the time, an adhesive bridge functions best with only one wing. For example, if a one-wing zirconia adhesive bridge is cemented using a cement containing MDP, replacing a maxillary lateral incisor adhesive, such an adhesive bridge may remain in place for up to 20 years, to the satisfaction of both dentist and patient. This restoration, with its survival rate of 95.2 per cent after five years, therefore qualifies as a permanent restoration. And the same goes for an onlay bridge made from zirconia. (cid:9) In summary, sandblasting and MDP are essential for the durable bonding of zirconia restorations. Furthermore, MDP is an extremely durable product.(cid:9) ‡It had long been assumed that the tetragonal and/or cubic structure would relapse into a monoclinic state owing to sandblasting, as a result of which fracturing would occur because of the associated expansion. Sandblasting with aluminium oxide particles of 50 µ at a maximum and a maximum air pressure of 2.5 bar does not, however, cause any damage. DT Dental Lab

Dental Tribune Pakistan Edition No.1, 2017

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