Full arch scans: conventional versus digital impressions--an in-vitro study.
Full arch scans: conventional versus digital impressions--an in-vitro study.
复制标题
全牙弓扫描：传统印模与数字印模——一项体外研究。
DOI：
10.5167/uzh-54545
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发表时间：
2011
影响因子：
1.7
通讯作者：
A. Mehl
中科院分区：
文献类型：
--
作者：
A. Ender;A. Mehl
数字化口内印模已成为CAD/CAM技术的核心部分。本研究的目的是比较的准确性（真实性和精度）的数字印模的全牙弓与传统印模的体外模型。为此，采用一种新的参考扫描方法获得了主模型，其测量准确度为+/- 4.1微米，精度为+/- 2.5微米。一方面，传统的印模，然后石膏模型（n = 5），从这个主模型，另一方面，数字印模与Cerec AC Bluecam和Lava COS系统（每个n = 5）。石膏模型也用参考扫描仪扫描。将现有的数据记录叠加，并确定差异。与主模型的偏差定义了印模方法的正确性。模型之间的偏差证明了该方法的精度。传统印模组的印模真实度为55 +/- 21.8 microm，Cerec Bluecam数字印模为49 +/- 14.2 microm，Lava COS数字印模为40.3 +/- 14.1 microm。Impregum传统印模的精度为61.3 +/- 17.9 microm，Cerec Bluecam数字印模的精度为30.9 +/- 7.1 microm，Lava COS数字印模的精度为60.1 +/- 31.3 microm。这些体外结果表明，数字印模的准确性与传统印模的准确性相似。这些结果将在进一步的临床研究中得到证实。
The digital intraoral impression has become a central part of the CAD/CAM technique. The objective of the present study was to compare the accuracy (trueness and precision) of digital impressions of the full arch with that of conventional impressions on the in-vitro model. For this purpose, a master model was acquired with a new reference scanning process, the measuring trueness of which was +/- 4.1 microm and the precision +/- 2.5 microm. On the one hand, conventional impressions and then plaster models (n = 5) were produced from this master model, and on the other hand, digital impressions were made with the Cerec AC Bluecam and the Lava COS system (each n = 5). The plaster models were also scanned with the reference scanner. The available data records were superimposed and the differences determined. The deviation from the master model defines the trueness of the impression method. The deviations of the models among one another demonstrate the precision of the method. The trueness of the impressions was 55 +/- 21.8 microm in the conventional impression group, for digital impressions with Cerec Bluecam it was 49 +/- 14.2 microm and for digital impressions with Lava COS 40.3 +/- 14.1 microm. The precision was 61.3 +/- 17.9 microm for conventional impression with Impregum, 30.9 +/- 7.1 microm for digital impression with the Cerec Bluecam and 60.1 +/- 31.3 microm for digital impression with Lava COS. These in-vitro results 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.