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Dental Tribune United Kingdom Edition

15Cosmetic TribuneJuly 11-17, 2011United Kingdom Edition durable, first-class restoration. Patients focus on the visual out- come. The shape and shade of the restoration must adapt per- fectly to the surrounding tooth structure. The final perceptible shade effect, however, depends on a large number of factors, which a modern composite ma- terial must fulfil. The shade perceived by the eye is a subjective sensation and comprises a variety of in- dividual physical aspects. The main physical aspects are hue, intensity and brightness. Fac- tors such as reflection, refrac- tion, translucency and fluores- cence are also important with regard to the appearance of a finished restoration. The colour perception of the human eye is influenced by the power spectrum of the light which falls on the retina, whereby this light not only orig- inates from the object observed but also from the surrounding area in particular. The phe- nomenon of metamerism can, however, lead to prob-lems in conservative dentistry: materi- als can appear to be the same colour or differently coloured depending on the type of light- ing. This means that the natural tooth and filling material could appear to match perfectly in certain surroundings but not in other surroundings. It is therefore important when selecting a material, to choose a composite with physi- cal properties that allow it to adapt to the surrounding tooth structure. The size of the filler particles and the quantity ra- tio between fillers and matrix play a fundamental role in this case. The nano-hybrid mate- rial Venus Diamond has a new, patented matrix and an innova- tive nano-hybrid filler system, enhancing the aesthetics, dura- bility and handling characteris- tics. Its outstanding adaptation to the surrounding tooth struc- ture provides for a very natural appearance and is de-scribed as the diamond effect. Venus Diamond: The material Venus Diamond is a special urethane monomer-based com- posite produced using nanote- chnology. An optimised filler systen with fillers in the nano range and a new designed ma- trix determine and optimise both the mechanical-physical and optical properties. The na- noparticles are distributed uni- formly in the organic matrix due to the use of non-agglom- erated silicon oxide nanofillers. In addition to the free nanopar- ticles, there are larger fillers made from barium aluminium fluoride glass in the matrix. The band width of the filler parti-cle sizes is therefore between 5nm and 20µm. This allows the total filler content to be increased to 64 per cent by volume (82 per cent by mass). Optimisation of the particle size and the more homogeneous distribution of the particles in the Venus. page 16DTà ‘The size of the filler particles and the quantity ratio between fillers and matrix play a fun- damental role in this case’ Fig.5: Application of the etch-and-rinse one-bottle adhesive iBOND Total Etch on the enamel and dentine and polymerisa-tion. 40% of denture patients are concerned about denture odour1 Recommend Poligrip denture cleansing tablets to help your patients control denture odour That’s because brushing dentures with ordinary toothpaste can scratch denture surfaces3 . And scratched surfaces can lead to bacterial growth4 leading to denture odour. Scanning electron microscope (SEM) images at 240 minutes confirm a significantly higher build up of Streptococcus oralis on denture materials previously cleaned with ordinary toothpaste vs. a non abrasive solution5 Poligrip denture cleansing tablets effectively remove plaque and tough stains6 without scratching3 , to leave dentures clean and fresh. Poligrip Total Care denture cleansing tablets also kill 99.9% of odour causing bacteria. Yet many denture wearers fail to keep their dentures clean2 . References: 1. GlaxoSmithKline data on file, 2010. 2. Dikbas I et al, Int J Prosthodont 2006; 19: 294-8. 3. GlaxoSmithKline data on file Study L2630368 2006. 4. Charman KM et al. Lett Appl Microbiol. 2009; 48(4):472-477. 5. GlaxoSmithKline data on file Study NPD/EU/062/07 2008. 6. GlaxoSmithKline data on file Study USNPD 016 and CS5244. POLIGRIP is a registered trade mark of the GlaxoSmithKline group of companies. S P E A K , E A T A N D S M I L E W I T H C O N F I D E N C E SM1859_12 Poligrip Cleansers Advert - Dental Tribune.indd 1 17/09/2010 17:06