Investigation of accuracy and reproducibility of abutment position by intraoral scanners Shota Fukazawa, DDS, Chikayuki Odaira, DDS, PhD, Hisatomo Kondo,

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Investigation of accuracy and reproducibility of abutment position by intraoral scanners Shota Fukazawa, DDS, Chikayuki Odaira, DDS, PhD, Hisatomo Kondo, DDS, PhD Journal of Prosthodontic Research Volume 61, Issue 4, Pages 450-459 (October 2017) DOI: 10.1016/j.jpor.2017.01.005 Copyright © 2017 Japan Prosthodontic Society Terms and Conditions

Fig. 1 Reference models. Journal of Prosthodontic Research 2017 61, 450-459DOI: (10.1016/j.jpor.2017.01.005) Copyright © 2017 Japan Prosthodontic Society Terms and Conditions

Fig. 2 Reference models were measured by the CNCCMM (computer numerical control coordinate measuring machine). CNCCMM’s stylus touches the surface of the ball abutments, determines the three dimensional position of the center of the abutments and calculates the distance between the two ball abutments. Journal of Prosthodontic Research 2017 61, 450-459DOI: (10.1016/j.jpor.2017.01.005) Copyright © 2017 Japan Prosthodontic Society Terms and Conditions

Fig. 3 Intraoral scanner and laboratory scanner. (A) Lava COS (COS) (B) Second-generation 3M™ true definition scanner (TDS2) (C) Third-generation 3M™ true definition scanner (TDS3) (D) TRIOS (TR) (E) KaVo ARCTICA Auto Scan Journal of Prosthodontic Research 2017 61, 450-459DOI: (10.1016/j.jpor.2017.01.005) Copyright © 2017 Japan Prosthodontic Society Terms and Conditions

Fig. 4 Overview of reference model and optical impression techniques. (A) Reference model A (B) Reference model B (C) Reference model scanned with COS (D) Reference model scanned with TDS2 (E) Reference model scanned with TDS3 (F) Reference model scanned with TR (G) Reference model scanned with KA The 3D models were exported as standard triangulation language data. Distance between the two implants was measured by 3D analyzing software. Journal of Prosthodontic Research 2017 61, 450-459DOI: (10.1016/j.jpor.2017.01.005) Copyright © 2017 Japan Prosthodontic Society Terms and Conditions

Fig. 5 The centers of the ball abutments were identified by plotting six points of the surface of ball abutments. Journal of Prosthodontic Research 2017 61, 450-459DOI: (10.1016/j.jpor.2017.01.005) Copyright © 2017 Japan Prosthodontic Society Terms and Conditions

Fig. 6 Distance between the center points of the ball abutments was measured. Journal of Prosthodontic Research 2017 61, 450-459DOI: (10.1016/j.jpor.2017.01.005) Copyright © 2017 Japan Prosthodontic Society Terms and Conditions

Fig. 7 Trueness values of each scanner for reference model A. Journal of Prosthodontic Research 2017 61, 450-459DOI: (10.1016/j.jpor.2017.01.005) Copyright © 2017 Japan Prosthodontic Society Terms and Conditions

Fig. 8 Precision values of each scanner for reference model A. Journal of Prosthodontic Research 2017 61, 450-459DOI: (10.1016/j.jpor.2017.01.005) Copyright © 2017 Japan Prosthodontic Society Terms and Conditions

Fig. 9 Trueness values of each scanner for reference model B. Journal of Prosthodontic Research 2017 61, 450-459DOI: (10.1016/j.jpor.2017.01.005) Copyright © 2017 Japan Prosthodontic Society Terms and Conditions

Fig. 10 Precision values of each scanner for reference model B. Journal of Prosthodontic Research 2017 61, 450-459DOI: (10.1016/j.jpor.2017.01.005) Copyright © 2017 Japan Prosthodontic Society Terms and Conditions