fa Reduced wear of enamel with novel fine and nano-scale leucite glass-ceramics سلامت دهان و جامعه نگر Oral Health and Epidemiology پژوهشي Research <p> <strong>Objectives</strong></p><p>  Leucite glass-ceramics used to produce all-ceramic restorations can suffer from brittle fracture and wear the opposing teeth. High strength and fine crystal sized leucite glass-ceramics have recently been reported. The objective of this study is to investigate whether fine and nano-scale leucite glass-ceramics with minimal matrix microcracking are associated with a reduction in in vitro tooth wear. </p><p> <strong>Methods</strong></p><p>  Human molar cusps (n=12) were wear tested using a Bionix-858 testing machine (300,000 simulated masticatory cycles) against experimental fine crystal sized (FS), nano-scale crystal sized (NS) leucite glass-ceramics and a commercial leucite glass-ceramic (Ceramco-3, Dentsply, USA). Wear was imaged using Secondary Electron Imaging (SEI) and quantified using white-light profilometry. </p><p> <strong>Results</strong></p><p>  Both experimental groups were found to produce significantly (p<0.05) less volume and mean-height tooth loss compared to Ceramco-3. The NS group had significantly (p<0.05) less tooth mean-height loss and less combined (tooth and ceramic) loss than the FS group. Increased waviness and damage was observed on the wear surfaces of the Ceramco-3 glass-ceramic disc/tooth group in comparison to the experimental groups. This was also indicated by higher surface roughness values for the Ceramco-3 glass-ceramic disc/tooth group. <strong></strong></p><p> <strong>Conclusions</strong></p><p>  Fine and nano-sized leucite glass-ceramics produced a reduction in in vitro tooth wear. The high strength low wear materials of this study may help address the many problems associated with tooth enamel wear and restoration failure. </p><hr><p></p><p> <strong>Source: </strong>Journal of Dentistry</p><p><a href="http://www.jodjournal.com/article/S0300-5712(13)00051-1/abstract" target="_blank"><font color="#0000ff"> Full Text</font></a></p> Tooth, Porcelain, Abrasion, Microstructure, Crystallisation, Profilometry 0 0 http://idai.ir/browse.php?a_code=A-10-32-2166&slc_lang=fa&sid=1 Antonios Theocharopoulos 100319475328460010178 100319475328460010178 Yes Centre for Adult Oral Health, Barts and the London, School of Medicine and Dentistry, Queen Mary University of London, Turner Street, London E1 2AD, UK Xiaohui Chen 100319475328460010179 100319475328460010179 No Centre for Adult Oral Health, Barts and the London, School of Medicine and Dentistry, Queen Mary University of London, Turner Street, London E1 2AD, UK Robert Hill 100319475328460010180 100319475328460010180 No Dental Physical Sciences, Barts and the London, School of Medicine and Dentistry, Queen Mary University of London, Mile End Road, E1 4NS, UK Michael J. Cattell 100319475328460010181 100319475328460010181 No Centre for Adult Oral Health, Barts and the London, School of Medicine and Dentistry, Queen Mary University of London, Turner Street, London E1 2AD, UK