J Adv Prosthodont.  2018 Aug;10(4):328-334. 10.4047/jap.2018.10.4.328.

Evaluation of the reproducibility of various abutments using a blue light model scanner

Affiliations
  • 1Institute for Health Science, Korea University, Seoul, Republic of Korea.
  • 2Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University, Seoul, Republic of Korea. kuc2842@korea.ac.kr
  • 3Department of Dental Technology, Medical Campus, Kyung-Dong University, Wonju, Republic of Korea.

Abstract

PURPOSE
To evaluate the reproducibility of scan-based abutments using a blue light model scanner.
MATERIALS AND METHODS
A wax cast abutment die was fabricated, and a silicone impression was prepared using a silicone material. Nine study dies were constructed using the prepared duplicable silicone, and the first was used as a reference. These dies were classified into three groups and scanned using a blue light model scanner. The first three-dimensional (3D) data set was obtained by scanning eight dies separately in the first group. The second 3D data set was acquired when four dies were placed together in the scanner and scanned twice in the second group. Finally, the third 3D data set was obtained when eight dies were placed together in the scanner and scanned once. These data were then used to define the data value using third-dimension software. All the data were then analyzed using the non-parametric Kruskal-Wallis H test (α=.05) and the post-hoc Mann-Whitney U-test with Bonferroni's correction (α=.017).
RESULTS
The means and standard deviations of the eight dies together were larger than those of the four dies together and of the individual die. Moreover, significant differences were observed among the three groups (P < .05).
CONCLUSION
With larger numbers of abutments scanned together, the scan becomes more inaccurate and loses reproducibility. Therefore, scans of smaller numbers of abutments are recommended to ensure better results.

Keyword

Reproducibility; Blue light scanner; Three-dimensional; Computer-aided design and computer-aided manufacturing (CAD/CAM); Abutment

MeSH Terms

Dataset
Silicon
Silicones
Silicon
Silicones

Figure

  • Fig. 1 Wax master die for this study. (A) Occlusal surface width of 6 mm, (B) Axial wall height of 5.2 mm, (C) Axial wall base of 1 mm, (D) Axial angle of 6°, (E) Width of 1,5 mm for triangular notch, (F) Length of 1 mm for triangular notch.

  • Fig. 2 One study die placed on multi-die tray in blue light model scanner. (A) Scan of abutment teeth in position 1, (B) After placement of one abutment in position 1 and scanning.

  • Fig. 3 Four study dies placed on multi-die tray in blue light model scanner. (A) Scan of abutment teeth in positions 1 – 4, (B) After placement of one abutment in positions 1 – 4 and scanning.

  • Fig. 4 Eight study dies placed on multi-die tray in blue light model scanner. (A) Scan of abutment teeth in positions 1 – 8, (B) After placement of one abutment in positions 1 – 8 and scanning.

  • Fig. 5 Process for analyzing color difference maps.

  • Fig. 6 Evaluation of reproducibility in three groups using blue light model scanner. Color difference maps of OS group (A – F), FS group (G – L), and ES group (M – R). Green area (No error), yellow to red (positive error), blue to dark blue (negative error).


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