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KMID : 1023820140060060468
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The Journal of Advanced Prosthodontics
2014 Volume.6 No. 6 p.468 ~ p.473
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Accuracy of 3D white light scanning of abutment teeth impressions: evaluation of trueness and precision
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Jeon Jin-Hun
Kim Hae-Young
Kim Ji-Hwan
Kim Woong-Chul
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Abstract
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PURPOSE : This study aimed to evaluate the accuracy of digitizing dental impressions of abutment teeth using a white light scanner and to compare the findings among teeth types.
MATERIALS AND METHODS : To assess precision, impressions of the canine, premolar, and molar prepared to receive all-ceramic crowns were repeatedly scanned to obtain five sets of 3-D data (STL files). Point clouds were compared and error sizes were measured (n=10 per type). Next, to evaluate trueness, impressions of teeth were rotated by 10°-20° and scanned. The obtained data were compared with the first set of data for precision assessment, and the error sizes were measured (n=5 per type). The Kruskal-Wallis test was performed to evaluate precision and trueness among three teeth types, and post-hoc comparisons were performed using the Mann-Whitney U test with Bonferroni correction (α=.05).
RESULTS : Precision discrepancies for the canine, premolar, and molar were 3.7 μm, 3.2 μm, and 7.3 μm, respectively, indicating the poorest precision for the molar (P<.001). Trueness discrepancies for teeth types were 6.2 μm, 11.2 μm, and 21.8 μm, respectively, indicating the poorest trueness for the molar (P=.007).
CONCLUSION : In respect to accuracy the molar showed the largest discrepancies compared with the canine and premolar. Digitizing of dental impressions of abutment teeth using a white light scanner was assessed to be a highly accurate method and provided discrepancy values in a clinically acceptable range. Further study is needed to improve digitizing performance of white light scanning in axial wall.
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KEYWORD
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White light scanner, Accuracy, Precision and trueness, Impression scanning, 3D shape data, Point cloud
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