J Korean Dent Sci.  2020 Jun;13(1):28-34. 10.5856/JKDS.2020.13.1.28.

Accuracy of the Point-Based Image Registration Method in Integrating Radiographic and Optical Scan Images: A Pilot Study

  • 1Department of Prosthodontics, School of Dentistry, Kyungpook National University, Korea
  • 2Institute for Translational Research in Dentistry, Kyungpook National University, Daegu, Korea


The purpose of this study was to investigate the influence of different implant computer software on the accuracy of image registration between radiographic and optical scan data.
Materials and Methods
Cone-beam computed tomography and optical scan data of a partially edentulous jaw were collected and transferred to three different computer softwares: Blue Sky Plan (Blue Sky Bio), Implant Studio (3M Shape), and Geomagic DesignX (3D systems). In each software, the two image sets were aligned using a point-based automatic image registration algorithm. Image matching error was evaluated by measuring the linear discrepancies between the two images at the anterior and posterior area in the direction of the x-, y-, and z-axes. Kruskal–Wallis test and a post hoc Mann–Whitney U-test with Bonferroni correction were used for statistical analyses. The significance level was set at 0.05. Result: Overall discrepancy values ranged from 0.08 to 0.30 μm. The image registration accuracy among the software was significantly different in the x- and z-axes (P=0.009 and <0.001, respectively), but not different in the y-axis (P=0.064).
The image registration accuracy performed by a point-based automatic image matching could be different depending on the computer software used.


Accuracy; Cone-beam computed tomography; Digital scan; Image registration
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