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Dental Tribune Middle East & Africa No. 3, 2017

Dental Tribune Middle East & Africa Edition | 3/2017 NEWS 45 Latest CAD/CAM materials less likely to be stained by coffee than conventional resins was restored after polishing with prophylaxis paste for 20 seconds. Of the conventional composite resins, Durafill and Filtek Supreme Ultra still showed some noticeable discol- oration after polishing. The authors noted that, owing to the study’s in vitro design, it is unknown how external factors, including regu- lar toothbrushing, might affect the long-term discoloration of the mate- rials when used in patients. They fur- ther pointed out that one month of immersion might have exaggerated the results beyond what would be seen in vivo, as immersing materials in coffee for one week is the equiva- lent of about seven months of coffee drinking. The study, titled “Discoloration of vari- ous CAD/CAM blocks after immersion in coffee”, was published in the Febru- ary issue of the Restorative Dentistry and Endodontics journal. Coffee is one of the world’s most popular beverages; however, it is known for its tooth staining properties. A study has now tested how various CAD/CAM materials reacted to immersion in coffee. (Photograph: Pexels/PixaBay) VITA ENAMIC ® redefi nes load capacity.* The fi rst hybrid ceramic with dual network structure for unsurpassed absorption of masticatory forces T A E N A M I C ® o r o l l t i C V I m u E W ! N 1 / E 2 2 5 3 VITA ENAMIC ® • enormous load capacity since masticatory forces are absorbed • reduction of wall thickness possible to achieve restorations that require minimal preparation • highly precise and particularly accurate results • tooth-like material properties • fast and easy to process with no furnace required *) In addition to a high degree of elasticity, this innovative hybrid ceramic guarantees outstanding load capacity after adhesive bonding. www.vita-enamic.com facebook.com/vita.zahnfabrik VITA shade, VITA made. By DTI BANGKOK, Thailand/TOKYO, Japan: With the development of new ma- terials and technology in dentistry, expectations for durable and aes- thetically pleasing restorations are ever increasing. In a recent study, researchers from Thailand and Japan investigated how sensitive various restoration materials were to discol- oration from coffee. Leaving a lasting impression may be desirable in a job interview, but is certainly not what one wants from one’s morning coffee. Just like natu- ral teeth, restorative materials are susceptible to discoloration from certain foods and beverages with high staining properties, including coffee, tea and red wine. In order to avoid discoloration over time, sur- face quality is thus essential for the success of restorative treatments. New CAD/CAM composite resin blocks are industrially polymerised under standardised parameters at high temperature and pressure to achieve optimum properties at the microstructural level and a high de- gree of conversion. As a result, mate- rial characteristics have improved compared with direct restorative composite resin. In the study, researchers from the To- kyo Medical and Dental University in Japan and the Chulalongkorn Uni- versity in Bangkok aimed to evaluate how modern composite resin block materials developed for CAD/CAM systems react to coffee exposure compared with conventional resin materials. The the change in colour in eight CAD/CAM blocks, including five composite resin blocks (Block HC, Shofu; CER- ASMART, GC; GRADIA Block, GC; KZR-CAD Hybrid Resin Block, Yama- moto Precious Metal; Lava Ultimate, 3M ESPE), one hybrid ceramic block (VITA ENAMIC, VITA Zahnfabrik), one PMMA block (Telio CAD, Ivoclar Vi- vadent) and one feldspathic ceramic block (VITABLOCS Mark II, VITA Zah- nfabrik), and four conventional com- posite resins. The latter included one hybrid composite (CLEARFIL AP-X, Kuraray), one micro-filled composite (Durafill VS, Kulzer) and two nano- hybrid composites (ESTELITE SIGMA QUICK, Tokuyama Dental; Filtek Su- preme Ultra, 3M ESPE). researchers measured They created 10 mm discs from each of the restorative materials and then calculated the discs’ initial colour measurements before placing them in an instant coffee solution, which was changed daily. Colour changes were measured after one day, one week and one month. The results showed that the coffee solution significantly discoloured all of the discs over time; however, CAD/CAM materials were generally less affected than the conventional resin materials. After one month, the change in colour of CAD/CAM com- posite resin blocks and restorative composites ranged from 1.6 to 3.7 and from 2.1 to 7.9, respectively. Ac- cording to the researchers, only one material, Durafill VS, was not signifi- cantly more discoloured after one month than after one day. However, in testing whether the cof- fee stains were removable through polishing, the colour of all of the ma- terials, except for the GRADIA block,

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