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KMID : 1023820160080030214
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The Journal of Advanced Prosthodontics
2016 Volume.8 No. 3 p.214 ~ p.218
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Repeatability and reproducibility of individual abutment impression, assessed with a blue light scanner
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Jeon Jin-Hun
Kim Dong-Yeon
Lee Jae-Jun
Kim Ji-Hwan
Kim Woong-Chul
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Abstract
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PURPOSE : We assessed the repeatability and reproducibility of abutment teeth dental impressions, digitized with a blue light scanner, by comparing the discrepancies in repeatability and reproducibility values for different types of abutment teeth.
MATERIALS AND METHODS : To evaluate repeatability, impressions of the canine, first premolar, and first molar, prepared for ceramic crowns, were repeatedly scanned to acquire 5 sets of 3-dimensional data via stereolithography (STL) files. Point clouds were compared and the error sizes were measured (n=10, per type). To evaluate reproducibility, the impressions were rotated by 10-20° on the table and scanned. These data were compared to the first STL data and the error sizes were measured (n=5, per type). One-way analysis of variance was used to assess the repeatability and reproducibility of the 3 types of teeth, and Tukey honest significant differences (HSD) multiple comparison test was used for post hoc comparisons (α=.05).
RESULTS : The differences with regard to repeatability were 4.5, 2.7, and 3.1 μm for the canine, premolar, and molar, indicating the poorest repeatability for the canine (P<.001). For reproducibility, the differences were 6.6, 5.8, and 11.0 μm indicating the poorest reproducibility for the molar (P=.007).
CONCLUSION : Our results indicated that impressions of individual abutment teeth, digitized with a blue light scanner, had good repeatability and reproducibility.
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KEYWORD
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Blue light scanner, Repeatability, Reproducibility, Color-difference-map
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