Dental Tribune Indian Edition

4 Dental Tribune Indian Edition - July 2013World News 1st Place for DMG’s LuxaCore Z The June issue of the American tra- de publication “The Dental Advisor” focused on composites for core build- up*. Fourteen materials were clini- cally tested and evaluated. First place went once again to a material that has already been the recipient of many awards: LuxaCore Z-Dual. DMG’s dual-cure composite for core build-up and root post cementa- tion attained a top rating of 98%. The assessment reflects the verdict of 32 testers from the field, who used the material in 450 clinical cases. Luxa- Core Z-Dual was also highlighted as a preferred product in “The Dental Advisor Recommends”. The most outstanding feature of LuxaCore Z-Dual is that its mecha- nical properties virtually match the natural tooth; the material cuts like dentine. Thanks to specialized nano- technology and zirconium dioxide, the compressive strength, and cuttabi- lity values of its award-winning pre- decessor, LuxaCore-Dual, have been improved even further. Detailed information on LuxaCore Z can be found at www.dmg-dental.com *The Dental Advisor, June 2012, Vo- lume 29, No. 05. DMG Elbgaustraße 248 22547 Hamburg Telephone: +49 (0) 40 84 006-0 info@dmg-dental.com www.dmg-dental.com Researchers from the U.S. have found normal physical development in children treated with composites or amalgam. (Photo courtesy of Kacso Sandor/Shutterstock) WATERTOWN, Mass., USA: In contrast to prior studies, which had demonstrated that resin-based composite dental restoration mate- rials may impact children’s physi- cal growth by releasing bisphenol A, an endocrine-disrupting chemi- cal, an analysis of the same data has found no significant differences in physical development of children treated with either composites or amalgam. Researchers at the New England Research Institutes tested whether dental restoration materials affect children’s growth using a seconda- ry analysis of a study that was con- ducted as a part of the New England Children’s Amalgam Trial, one of only two randomized clinical safety trials in the U.S. to address the po- tential impact of mercury exposure from amalgam restorations on neu- ropsychological and renal function in children. The researchers investigated data from 218 boys and 256 girls aged 6 to 10 with two or more decayed posterior teeth that were randomly treated with amalgam or composite. “Overall, there were no significant differences in physical development over five years in children treated with composites or amalgam,” the researchers said. For instance, the results showed no significant diffe- rences between treatment assignment and changes in physical development in boys with regard to body mass in- dex, body fat percentage and height velocity. However, they found that girls tre- ated with composites had a lower risk of menarche during follow-up. Addi- tional studies examining these resto- ration materials in relation to age at menarche are warranted, the resear- chers said. The study was published online on Sept. 12 in the Journal of Dental Re- search ahead of print. DT Study finds no differences in children treated with composites or amalgam Early BPA exposure may adversely affect formation of tooth enamel Lines on a maxillary incisor attributed to differences in mineralisation during amelogenesis. (Photo courtesy of Politikaner) PARIS, France: New research from France has suggested that bisphe- nol A (BPA), a chemical widely used in plastics and dental resins, is a potential causative agent of molar incisor hypomineralisation (MIH). Damage similar to this mineralisa- tion disorder, which occurs selecti- vely in permanent incisors and first molars, was observed in rodent te- eth after treatment with BPA. Researchers from the National Insti- tute of Health and Medical Research treated the incisors of rats daily with low doses of BPA (5 µg/kg/day) from birth to 30 or 100 days. At day 30 alre- ady, the erupting tooth enamel exhibi- ted signs of hypomineralisation simi- lar to human MIH. The researchers suggested that BPA disrupts normal protein removal from the enamel ma- trix and leads to mineral depletion, making the teeth more fragile. However, no such effect was obser- ved in 100-day-old rats. As their erupting incisor enamel was normal, the scientists suggested that enamel formation is only sensitive to MIH- causing agents during a specific time window in early development. As it is strongly suspected that BPA has the same effects on humans as on laboratory animals, it could be a causal agent of MIH, concluded Dr Sylvie Babajko, a research director at the institute. The condition is found in roughly 18 percent of children aged between 6 and 8. The permanent maxillary cen- tral incisors and first molars are af- fected most often, and the permanent mandibular incisors less frequently. Usually, the teeth show a yellowish- white to brown discoloration, which may affect only certain areas of the tooth or the whole tooth. The teeth of MIH children are commonly hyper- sensitive to pain and more susceptible to cavities. Endocrine-disrupting chemicals, including BPA, are ubiquitous envi- ronmental pollutants and increasingly associated with health concerns. Prior studies have associated it with adverse effects on reproduction, neurological development, and metabolism. The manufacture and marketing of babies’ bottles containing BPA were banned in Europe in 2011. The prohibition will be extended to all food containers in France from July 2015. The study, titled “Enamel defects reflect perinatal exposure to bisphe- nol A”, was published online on 10 June in the American Journal of Pa- thology ahead of print. DT