Accuracy of full-arch scans using intraoral scanners
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This study aimed to evaluate the accuracy of intraoral scanners in full-arch scans.
Materials and methods
A representative model with 14 prepared abutments was digitized using an industrial scanner (reference scanner) as well as four intraoral scanners (iTero, CEREC AC Bluecam, Lava C.O.S., and Zfx IntraScan). Datasets obtained from different scans were loaded into 3D evaluation software, superimposed, and compared for accuracy. One-way analysis of variance (ANOVA) was implemented to compute differences within groups (precision) as well as comparisons with the reference scan (trueness). A level of statistical significance of p < 0.05 was set.
Mean trueness values ranged from 38 to 332.9 μm. Data analysis yielded statistically significant differences between CEREC AC Bluecam and other scanners as well as between Zfx IntraScan and Lava C.O.S. Mean precision values ranged from 37.9 to 99.1 μm. Statistically significant differences were found between CEREC AC Bluecam and Lava C.O.S., CEREC AC Bluecam and iTero, Zfx Intra Scan and Lava C.O.S., and Zfx Intra Scan and iTero (p < 0.05).
Except for one intraoral scanner system, all tested systems showed a comparable level of accuracy for full-arch scans of prepared teeth. Further studies are needed to validate the accuracy of these scanners under clinical conditions.
Despite excellent accuracy in single-unit scans having been demonstrated, little is known about the accuracy of intraoral scanners in simultaneous scans of multiple abutments. Although most of the tested scanners showed comparable values, the results suggest that the inaccuracies of the obtained datasets may contribute to inaccuracies in the final restorations.
KeywordsIntraoral scanner Digital impression Full-arch scan Accuracy of intraoral scanners Precision of intraoral scanners Trueness of intraoral scanners
The authors would like to express their gratitude to Sirona (Bensheim, Germany), 3M ESPE (St. Paul, USA), Cadent Inc. (Carlstadt, USA), and Zfx GmbH (Dachau, Germany) for providing intraoral scanners. Furthermore, the authors want to thank MDT Siegbert Witkowski and MDT Wolf Woerner (Freiburg, Germany) for their help in data processing.
Conflict of interest
The authors have no conflict of interest.
- 19.Babayoff N, Glaser-Inbari I (2000) Imaging a three-dimensional structure by confocal focussing an array of light beams. International Publication WO 00/08415Google Scholar
- 20.Birnbaum NS, Aaronson HB, Stevens C, Cohen B (2009) 3D digital scanners: a high-tech approach to more accurate dental impressions. Insid Dent 5:70–74Google Scholar
- 22.Brandestini M, Moermann WH (1989) Method of and apparatus for making a prosthesis, especially a dental prosthesis. US Patent 4663720Google Scholar
- 23.Schwotzer A (2007) Measuring device and method that operates according to the basic principles of confocal microscopy. US Patent 2007/0296959Google Scholar
- 24.Thiel F, Pfeiffer J, Fornoff P (2008) Apparatus and method for optical 3D measurement. International Publication WO 2008/092791Google Scholar
- 25.Schmidt V (2010) 3D dental camera for recording surface structures of a measuring object by means of triangulation. International Publication WO 2010/012838 A1Google Scholar
- 27.Kovács T (2004) Active triangulation scanner development focusing on the accuracy of the detection. In: 5th International Symposium of Hungarian Researchers: Sponsored by IEEE Computational Intelligence Chapter, Budapest, Magyarország, 2004.11.11–2004.11.12. pp 183–194Google Scholar
- 28.Logozzo S, Franceschini G, Kilpelä A, Caponi M, Governi L, Blois L (2011) A comparative analysis of intraoral 3D digital scanners for restorative dentistry. Internet J Med Technol 5(1). http://ispub.com/IJMT/5/1/10082
- 29.Berner M (2010) Optical system for a confocal microscope. US Patent 2010/0085636Google Scholar
- 30.Figerio F (2006) 3-dimensional surface imaging using active wavefront sampling (PhD Thesis). Massachusetts Institute of Technology, Massachusetts, USA. http://dspace.mit.edu/handle/1721.1/38258
- 31.Besl PJ, McKay ND (1992) A method for registration of 3-D shapes. In: IEEE Transactions on Pattern Analysis and Machine Intelligence. 14(2):239–256Google Scholar
- 33.Mada SK, Smith ML, Smith LN, Midha PS (2003) Overview of passive and active vision techniques for hand-held 3D data acquisition. In: Shearer A, Murtagh FD, Mahon J, Whelan PF (eds) Opto-Ireland 2002: Optical metrology, imaging, and machine vision, Galway, Ireland, 2002. SPIE Digital Library. http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=879224