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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: christian@blueskybio.academy 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. The effect of surface grinding and sandblasting on flexural strength and reliability of Y-TZP zir- conia ceramic. Dent Mater. 1999 2. Fasbinder DJ. Restorative material options for CAD/CAM restorations. 14. Raigrodski AJ. Contemporary all-ceramic fixed partial dentures: a review. Compend Contin Educ Dent. 2002. Dent Clin North Am. 2004. 3. Pallesen U, van Dijken JW. An 8-year evaluation of sintered ceramic and glass ceramic inlays processed by the Cerec CAD/CAM system. Eur J Oral Sci. 2000. 4. Kelly JR, Denry IL. Stabilized zirconia as a structural ceramic: an overview. Dent Mater 2008. 24:289–98. 15. Neves F, Prado C, Prudente M, Carneiro T, Zancope K, Davi L, Mendonçe G, Cooper L, Soares C. Marginal fit evaluation with micro CT of lithium disili- cate crowns fabricated by chairside CAD/CAM systems and the heat-press- ing technique. J Prosthet Dent. 2014. 5. Kelly, R. Nishimura, I. Campbell, S. Ceramics in dentistry: Historical roots 16. Hertlein G. Kramer M, Sprengart T, et al. Milling time vs marginal fit of CAD/ and current perspectives. Journal of Prosthetic Dent. 1996. CAM manufactured zirconia restorations. J. Dent Res 2003. 82:194. 6. Tinschert J, Zwez D, Marx R, Anusavice KJ. Structural reliability of alumina, feldspar, leucite and zirconia based ceramics. J Dent 2000. 28:529–535 7. Luthardt RG, Sandkuhl O, Reitz B. Zirconia- TZP and alumina advanced technologies for the manufacturing of single crowns. Eur J Prosthodont Restor Dent. 1999. 8. Kurbad A, Reichel K. Multicolored ceramic blocks as an esthetic solution for anterior restorations. Int J Comput Dent. 2006. 9. Bindl A, Mormann WH. Survival rate of mono-ceramic and ceramic-core CAD/ CAM-generated anterior crowns over 2–5 years. Eur J Oral Sci. 2004. 10. Esquivel-Upshaw JF, Chai J, Sansano S, Shonberg D. Resistance to staining, flexural strength, and chemical solubility of core porcelains for all-ceramic crowns. Int J Prosthodont. 2001. 11. Reich SM, Peltz I, Wichmann M, Estafan D. A comparative study of two CEREC software systems in evaluating manufacturing time and accuracy of restorations. Gen Dent. 2005 17. Guazzato M, Proos K, Quach L, Swain MV. Strength reliability and mode of fracture of bilayered porcelain/zirconia (Y-TZP) dental ceramics. Bio- materials. 2004. 18. Syrek, A. Reich, G. Ranftl, D., Klein, C. Cerny, B. Brodesser, J. (2010). Clini- cal evaluation of all-ceramic crowns fabricated from intraoral digital im- pressions based on the principle of active wavefront sampling. Journal of Dentistry. 2010. 19. De Vico G, Ottria L, Bollero P, Bonino M, Cialone M, Barlattani A Jr. et al. Aes- thetic and functionality in fixed prosthodontic: experimental and clinical anal- ysis of the CAD–CAM systematic 3Shape. Oral Implantol. 2008; 1:104–115. 20. Gehrt, M. Wolfart, S. Rafai, N., Reich, S. Edelhoff, D. (2013). Clinical results of lithium-disilicate crowns after up to 9 years of service. Clinical Oral In- vestigations. 17(1), 275–84. 21. Gupta TK, Bechtold JH, Kuznickie RC, Cadoff LH, Rossing BR. Stabilization of tetragonal phase in polycrystalline zirconia. J Mater Sci 1978;13:1464. 12. Anusavice, K. Phillips’ Science of Dental Materials. 12 edition. In: Saunders. 22. Piconi C, Maccauro G. Zirconia as a ceramic biomaterial. Biomaterials. Elsevier; 2014. 1999; 20:1–25. 2_2017 21

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