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KMID : 0362120120340030213
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Journal of Technologic Dentistry
2012 Volume.34 No. 3 p.213 ~ p.220
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Three-dimensional evaluation on the repeatability and reproducibility of dental scanner-based digital models
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Lee Gyeong-Tak
Kim Jae-Hong
Kim Woong-Chul
Kim Ji-Hwan
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Abstract
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Purpose: The aim of this study was to determine the repeatability and reproducibility of two dental scanners.
Methods: The master die and the stone replicas(Kavo, Germany) were digitized in touch-probe scanner(Incise, Renishaw, UK), white light scanner(Identica, Medit, Korea) to create 3-dimensional surface-models. The number of points in the point clouds from each reading were calculated and used as the CAD reference model(CRM). Discrepancies between the points in the 3-dimensional surface models and the corresponding CRM were measured by a matching-software(Power-Inspect R2, Delcam Plc, UK). The t-student test for one samples were used for statistical analysis.
Results: The reproducibility of both scanner was within , based on mean value. The mean value between measurements made directly on the touch probe scanner digital models and those made on the white light scanner digital models was , and was statistically significant(P<0.05).
Conclusion: With respect to adequate data acquisition, the reproducibility of dental scanner differs. Three-dimensional analysis can be applied to differential quality analysis of the manufacturing process as well as to evaluation of different analysis methods.
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KEYWORD
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CRM(CAD Reference Model), dental scanner, digital model, point cloud, repeatability, reproducibility
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