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Dental Tribune South African Edition

7Press ReleasesDental Tribune South African Edition - March 2014 New findings by researchers from the SYSTEM Initiative based in Wits University’s Department of Community Dentistry/ Faculty of Health Sciences indicate that there is no evidence that high viscosity glass-ionomers are inferior to silver amalgams. This has challenged the supremacy of silver amalgams in dentistry and the widely held believe that these amalgams make better and more lasting tooth fillings than high viscosity glass-ionomers. The research was conducted by Dr Steffen Mickenautsch and Professor Veerasamy Yengopal, both from the Systematic Review initiative for Evidence-based Minimum Intervention in Dentistry (SYSTEM Initiative) in the Wits Faculty of Health. Experts have for decades spoken out against dentists’ choice to use of glass-ionomers instead of silver amalgam or composite resin materials for load bearing posterior tooth restorations. But their believes have been based on clinical evidence that, when closely examined, holds little scientific weight. In an effort to appraise the current clinical evidence regarding the merits of placing glass-ionomers as tooth restorations, the SYSTEM Initiative has conducted a systematic review of randomised control trials and a meta-epidemiological study. The systematic review included a literature search in 17 global and regional databases, as well as databases for open access journals and ‘grey’ literature. Besides searching the global databases PubMed/Medline and the Cochrane Library, the additional regional English databases searched comprised of the scientific dental literature from Africa, Europe, India and North America, whilst regional non-English databases comprised of the dental literature from China and Latin-speaking American countries. In total, 38 trials were accepted as evidence, comprising the investigation of more than 10 000 placed tooth restorations. The outcome shows that new generation, high-viscosity glass-ionomers cannot be regarded as inferior to amalgam, since no overall statistically significant difference was found in the clinical failure rate between load bearing high viscosity glass-ionomers and amalgam restorations after follow-up periods ranging from one to six years. Mickenautsch says: “The results of SYSTEM’s meta-epidemiological study show that statements concerning glass-ionomers’ inferiority to amalgam and other types of materials are based on incorrect statistical comparison methods. Such methods include the still common naïve-indirect comparison of restoration failure rates from uncontrolled clinical longitudinal studies.” “Simply put, the traditional argument against the use of glass-ionomers in modern dentistry is based on the wrong assumption that results from unrelated clinical trials with differing clinical settings and patient groups can be directly compared to one another. Instead, statements concerning the merits of clinical interventions should rest on the direct comparison of competing treatment options via randomised control trials.” Glass-Ionomer teeth fillings are not inferior to silver amalgam ones – a new study shows High-viscosity glass-ionomer restorations do not require provision of macro-retention by high-speed drilling, thus they offer the dental profession a more patient friendly approach for placing tooth restorations. Placing glass-ionomer restorations also reduces the likelihood of a repeated restoration cycle, because repair of failed restorations does not require the removal of remaining filling material from the tooth cavity. The new findings suggest that placing high-viscosity glass-ionomer restorations may offer an alternative to placing restorations with silver amalgam in load bearing posterior cavities of permanent teeth. DT Sirona announces material partnership with GC Japanese dental company GC becomes Sirona's latest material partner. The cooperation expands the global range of top-quality CAD/CAM blocks for Sirona systemsofferedbyauthorizedmanufacturers. Bensheim/Salzburg, February 11, 2014. Sirona, the technology leader in the dental industry, has entered into an agreement with a new material partner for the production of CAD/CAM blocks, such as composites and other restorative materials for CEREC and inLab. The Japanese dental company GC Corporation complements the group of selected partners that manufacture high-performance materials for the milling and grinding of CAD/CAM restorations: VITA Zahnfabrik, Ivoclar Vivadent, Merz Dental, DENTSPLY and 3M ESPE. GC produces consumables, devices and equipment for dental practices and laboratories. The Tokyo-based company is the global market leader for glass-ionomer materials and also the world's largest provider of expertise, advancements, product quality and top customer service in the fields of composites, ceramic layering and adhesive systems. "GC is a prestigious dental company that focuses primarily on Japan and other Asian markets. As these markets are becoming increasingly important for our CAD/CAM business, we are happy to have a material partner in the region who meets our high quality standards,” says Dr. Joachim Pfeiffer, Vice President of CAD/CAM Systems at Sirona in Bensheim. Sirona expects this partnership to provide sales support in the rapidly expanding Asian markets, while GC profits through established access to Sirona CAD/CAM users worldwide. Japan is one of the largest growth markets for CAD/CAM restorations and prostheses. The country is already very well prepared for the change to CAD/CAM technology. Therefore, innovative dental technology combined with high-quality materials is increasingly in demand by local dentists. DT Perfect complements: The CAD/CAM blocks of Sirona and selected partners are optimized to meet the specific requirements of the MC XL milling centers.