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KMID : 0362120110330030211
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Journal of Technologic Dentistry
2011 Volume.33 No. 3 p.211 ~ p.218
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A study on Common Errors in Digital Impressions: (An Example of CEREC AC)
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Kim Jae-Hong
Kim Ji-Hwan
Kim Hae-Young
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Abstract
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Purpose: The purpose of the study was a quantitative evaluation of common errors in digital impression procedure using CEREC AC system.
Methods: Two-hundreds digital impression data comprising 174 inlays, 26 onlays by CEREC AC in-office CAD/CAM system were obtained from a dental clinic. One evaluator assessed errors of the digital impression data and divided into five categories of errors: inappropriate scanner positioning (ISP), improper handling with a scanner (IHS), irregular powder arrangement (IPA), improper cavity preparation (ICP), and insufficient scanned data (ISD).
Results: The most common errors were IPA(21%), and ISP and ISD were followed by 17% respectively. IHS was found in 14.5% of all digital impression data. ICP comprising only 6.5% was the rarest.
Conclusion: Most errors were due to inaccurate manipulation with an intraoral scanner or improper cavity preparation for scanning. A deliberate manipulation to prevent common errors mentioned may deliver an optimal result in the digital impression procedure.
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KEYWORD
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CEREC AC, dental restoration, digital impression, intraoral scanner
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