“A 3D evaluation of the repeatability of accuracy in optical and contact scanners”
Cardiff Metropolitan University
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Objectives This in vitro study evaluated the repeatability of accuracy of the DS10 touch -probe scanner and the DS30 blue-light scanner by Renishaw®, assuming that there would be no difference between them in terms of consistency. Materials and methods An object with an irregular shape was fabricated in Class IV die stone. Its surface was digitised eight times with the optical scanner and eight times with the contact scanner. Each reading was considered as а Cad Reference Model (CRM) and three-dimensionally (3D) aligned to the other seven readings to assess the repeatability of the results of each scanner. Analysis of the alignments was performed using analysis software (Autodesk® Remake). Using a colour-differences map the discrepancies between the CRMs of each scanner were identified to evaluate their repeatability. A two-tailed T-test at a significance level of .01 was performed to test whether there was a difference between the scanners in terms of consistency. Results Based on the Standard Deviation (SD), the repeatability of the optical scanner was within 8.2µm (microns) and the touch-probe scanner was within 6.9µm (microns). The two-tailed T-test rejected the null hypothesis, indicating p-value smaller than the significance level of .01. Conclusion Statistically, there is a difference between the optical and the touch-probe scanner in terms of consistency. However, the results of both scanners are comparable and have the potential to generate dental restorations with a satisfactory clinical fit (Jeon, Choi and Kim, 2015).
BSc (Hons) Dental Technology
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