Full-arch intraoral scanning: comparison of two different strategies and their accuracy outcomes

  • Federico Mandelli | federico.mandelli@gmail.com Oral Science Dept. Vita Salute IRCCS – San Raffaele University Milan, Italy - Department of Fixed Prosthodontics, Italy.
  • Enrico Felice Gherlone Head Director Dental School, Vita-Salute University, Milan, Italy and Department of Dentistry, IRCCS San Raffaele Hospital, Milan, Italy.
  • Andrew Keeling Clinical Associate Professor in Restorative Dentistry, Leeds School of Dentistry, University of Leeds, United Kingdom.
  • Giorgio Gastaldi Associate Professor, Dental School, Vita-Salute San Raffaele University, Milan, Italy and Unit of Oral and Maxillofacial Surgery, San Rocco Clinical Institute, Ome, Brescia, Italy.
  • Marco Ferrari Chair, Department of Prosthodontics & Dental Materials, School of Dental Medicine, University of Siena, Professor, Department of Restorative Dentistry, School of Dentistry, University of Leeds, UK, Research Professor, Department of Restorative Dentistry, School of Dental Medicine, TUFTS University, Boston, USA, Italy.

Abstract

Aim To test if there is a difference in accuracy between full-arch scans performed as two separate halves and stitched together, or as one continuous scan from side to side.
Materials and Methods A reference model with six implants was milled as a single titanium block. Six scan bodies were manufactured and screwed into the implants. A reference 3D model was created using an industrial optical scanner. The experiment was performed using the same intraoral scanning machine (3M True Definition Scanner). The ‘Stitching’ strategy had the scan started from #27 to #13;after saving this part, the same procedure was performed from #17 to #23 and the software stitched the two halves automatically. The ‘No Stitching’ strategy had the scan performed as a single procedure. Using engineering software, six copies of the scan body CAD file were substituted to the six scan bodies of the RM and the centre point of each one was determined. Linear measurements were made between the detected points; mean distance and standard deviation were calculated for each of the fifteen measurement sets created.
Results Stitching and No Stitching did not show statistically significant differences (Stitching=0.0396 mm ±0.0409 mm, No Stitching=0.0452 mm ±0,0481 mm, p=.338) but they differed significantly comparing absolute errors (Stitching=0.0442 mm ±0.0358 mm, No Stitching=0.0555 mm±0,036 mm, p=.015).
Conclusions Stitching showed a better precision compared to No Stitching, exhibiting a smaller standard deviation and a higher error density closer to zero.

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Published
2018-07-26
Section
Articles
Keywords
Accuracy, Intraoral digital impression, Intraoral scanning, Precision, Trueness
Statistics
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