J Dent Rehabil Appl Sci.  2020 Mar;36(1):29-40. 10.14368/jdras.2020.36.1.29.

Comparison of the accuracy of implant digital impression coping

  • 1Department of Prosthodontics, College of Dentistry, Dankook University, Cheonan, Republic of Korea


The purpose of this study was to compare the accuracy of impression taking method using the encoded healing abutment, scan body and pick-up impression coping with different implant angulations.
Materials and Methods
Master model was fabricated by 3D printer and three implants were placed into the model with 0°, 10° and 20° mesial angulation. The abutments were secured to each implants and master model was scanned to make a reference model. Group P model was fabricated using pick-up impression copings and model was scanned after securing the abutments. Encoded healing abutment (Group E) and scan body (Group S) were secured on the master model and digital impression was taken using intraoral scanner 15 times each. Each STL files of test groups were superimposed with reference model using best fit alignment and root mean square (RMS) value was analyzed.
The RMS values were lowest in Group P, followed by Group S and Group E. Group P showed significant difference with Group S and E (P< 0.05) while there was no significant difference between Group S and E. Correlation between implant angulation and RMS value was significant in Group E (P < 0.05).
The pick-up impression coping method showed higher accuracy and there was no significant difference in accuracy between the healing abutment and the scan body. The clinical use of the encoded healing abutment is possible, but it should be used with caution in the case of angulated implant.


Intraoral impression technique; encoded healing abutment; implant impression; comparison accuracy; 3D deviation


  • Fig. 1 Master model with analogues inserted.

  • Fig. 2 Digital file of experimental abutment.

  • Fig. 3 Pick-up impression coping, scanbody and encoded healing abutment used in each group P, S and E.

  • Fig. 4 Scan data of Group E.

  • Fig. 5 3D comparison between reference model and test models illustrated in color-coded map of all abutments.

  • Fig. 6 Color coded map of 3D comparison between reference model and (A) Group P, (B) Group S, (C. Group E.


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