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- Title
In-vitro-Untersuchung zur Modellanalyse an 3-D-gedruckten Modellen.
- Authors
Müller, Martin; Ruge, Sebastian; Krey, Karl-Friedrich
- Abstract
Objective: One of the essentials of orthodontic diagnostics is the measurement of dental casts. The aim of the study was to evaluate the suitability of 3D-printed casts for orthodontic analysis. Material and Method: It was made (each upper and lower jaw in habitual occlusion) ten alginate impressions were taken from a Frasaco model and ten plaster models were made of hard plaster. The Frasaco model was also digitized with a resolution of 10 microns (S600 Arti, Fa. Zirkonzahn, Gais, Italy) using a 3-D model scanner. The digital model was reconstructed in OnyxCeph 3D Lab (Image Instruments, Chemnitz) and exported for the 3-D-print. Ten model pairs each were printed with a DLP (Digital Light Processing) printer (SHERAeco Print D30, Fa. Material Technology, Lemförde) with SHERA model fast and with a FDM (Fused Deposition Molding) printer (Geeetech i3 Prusa, Geeetech, ShenZen, China) with polylactide. The Frasaco model was measured ten times and everyone else once each with a digital caliper (PeWe Tools, Trochtelfingen) with data directly imported via USB interface. The key metrics like Overbite, Overjet, dental arch width, SI, SI, Ton and Bolton ratios were determined. Results: For the measurement of the Frasaco model, there were 5% confidence intervals of ± 0.05 to 0.1 mm and a mean standard deviation of 0.12 mm. In the statistical analysis using ANOVA with paired Mann-Whitney test significant differences were found only in si with 0.3 mm magnification on FDM models and a deviation of <0.4 mm reduced overbite on plaster models and FDM models compared to the original. Conclusions: The survey of study models with a digital caliper points an extremely high accuracy. Regardless of the printing process, both the printed models shwoed in the investigation only slight deviations from the original. Virtual models, printed models and plaster models used for orthodontic diagnostics are considered equivalent.
- Subjects
DENTAL fillings; FUSED deposition modeling; OVERBITE (Dentistry); DENTAL impressions; ORTHODONTICS
- Publication
Kieferorthopädie: die Zeitschrift für die Praxis, 2018, Vol 32, Issue 3, p215
- ISSN
0945-7917
- Publication type
Article