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Selected Publication:
Sokolowski, A.
Accuracy Assessment of 3D Printed Tooth Replicas.
Doktoratsstudium der Medizinischen Wissenschaft; Humanmedizin; [ Dissertation ] Graz Medical University; 2020. pp. 98
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- Authors Med Uni Graz:
- Advisor:
- Payer Michael
- Wegscheider Walther
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- Abstract:
- Introduction and Aim: For autologous tooth transplantations and root-analog dental implants, replicas of teeth are fabricated based on the data from cone beam computed tomographies. These applications require a particularly high degree of precision for clinical success. The aim of this study was to establish and evaluate a method for producing individual, 3D printed tooth replicas. In particular, the tooth replicas produced by additive manufacturing were examined in regard to their duplicative precision. Material and Method: Ten patients needing an extraction of a wisdom tooth and, additionally, a preoperative cone beam computed tomography (CBCT) were included. Patients with an intraoperative separation or fracture of the tooth were excluded. 3D slicer 4.6.2 was used as the software for tooth segmentation and model generation based on CBCT data. The additive manufacturing of tooth replicas was done by Direct Metal Laser Melting (DMLM). The 3D printed replicas and the corresponding extracted teeth were optically scanned, superimposed in CloudCompare 2.8.1 and examined for deviations between the surfaces. Results: The mean absolute surface deviations between the 3D printed replicas and the corresponding extracted teeth were in the range of 0.13 to 0.25 mm with an average of 0.18 mm and a standard deviation of 0.15 mm. 95% of the measuring points on the surfaces of all replicas deviated less than 0.47 mm. The volume decreased by -3.4% and the surface by -6.0%. The root mean square was 0.24 mm and the maximum surface deviation was 0.9 mm on average. The DMLM process itself showed a high precision with an average absolute deviation of 0.045 mm and a standard deviation of 0.04 mm. Discussion and Conclusion: On the basis of CBCT data, 3D printed replicas of teeth can be produced with a very high degree of precision. The method demonstrated in this study is therefore suitable for the additive manufacturing of dental replicas with a more than sufficient clinical accuracy. The application of the described method enables the fabrication of exact duplicates for autogenous tooth transplants or the production of precise, individual root-analog dental implants.