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CAD/CAM - international magazine of digital dentistry, Italian Edition, No.2, 2017

literature review _ CAD/CAM material and systems marginal fit expected from conventional meth- ods and within the range of clinically accepted restorations. When comparing both methods the advantage of using CAD/CAM technology is not to obtain the most precise level of fit, but rather to obtain a high level of reliability in a large number of restorations; especially when high production levels are expected. However, there are a limited number of clinical studies and the diversity of the results between sys- tems and protocols does not allow us to give a definitive conclusion. _about the authors Dr Christian Brenes, DDS. Master in Prosthodontics. Clinical Assistant Professor Dental College of Georgia at Augusta University. International speaker for Digital Dentistry Education and BlueSkybio Academy on guided surgery, clinical digital protocols and dental aesthetics. He can be contacted at: Dr Ibrahim Duqum, DDS. MS. Clinical Assistant Professor. Department of Prosthodontics at the University of North Carolina at Chapel Hill. Dr Gustavo Mendonza, DDS. MS. PhD. Clinical Associate Professor. Department of Biologic and Materials Sciences, Division of Prosthodontics, University of Michigan School of Dentistry. the fabrication of dental restorations is still a complex task that requires experience, knowl- edge and skills. The incorporation of new systems and ma- terials bring a lot of concerns regarding system implementation, capabilities and mechanical properties of the different materials. One of the biggest problems that still remain in CAD/CAM dental systems is the accuracy of each step in the CAD/CAM chain, from digital impression to the milling step. Using computer aided manu- facturing is dependent on the calibration of hardware with software in the workflow. Fur- thermore, the virtual configuration of the die spacer between the tooth and the restorations is essential for the accuracy of the marginal ad- aptation and has to be calibrated for each one of the systems. Weittstein et al. demonstrated that the difference of fit between CAD/CAM resto- rations is directly related to the gap parameters from the computer design and also related to the intrinsic properties of the CAD/CAM system.16 _Conclusion This review of current and past literature regarding the evolution, characteristics, and marginal fit of milled CAD/CAM all-ceramic res- torations materials and systems show that it is possible to fabricate restorations with the same _references 1. Miyazaki T, Hotta Y, Kunii J, Kuriyama S, Tamaki Y. A review of dental CAD/ CAM: current status and future perspectives from 20 years of experience. Dent Mat Journal 2009. 28: 44–56. 13. Kosmac T, Oblak C, Jevnikar P, Funduk N, Marion L. 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