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KMID : 0362120120340020121
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Journal of Technologic Dentistry
2012 Volume.34 No. 2 p.121 ~ p.128
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Reliability, accuracy of evaluations obtained from CEREC AC system digital impression: an in-vitro study
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Kim Jae-Hong
Kim Ki-Baek
Kim Hae-Young
Kim Jung-Ae
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 reliability and accuracy of measurements in digital models(CEREC AC) compared to stone models.
Methods: A master model(500B-1, Nissin Dental Product, Japan) with the prepared upper full arch tooth was used. Conventional impression and then stone model(n=10) were produced from this master model, and on the other hands, digital impressions were made with the CEREC AC intra-oral scanner(n=10). One examiner measured two times the intercanine, intermolar distance, dental arch length. The stone model were measured using a digital caliper. The t-student test for paired samples and intraclass correlation coefficient(ICC) were used for statistical analysis.
Results: The measurement of two methods showed very good reliability. At the intra-examiner reliability of measurement, ICC at the stone and CEREC AC model were 0.81 and 0.94. The mean difference between measurements made directly on the stone models and those made on the CEREC AC model was 0.20~0.28mm, and was statistically significant(P=0.001).
Conclusion: These in vitro studies show that accuracy of the digital impression is similar to that of the conventional impression. These results will have to be confirmed in further clinical studies.
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KEYWORD
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accuracy, CEREC AC, digital impression, stone model, reliability
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