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Evaluation of Different Designed Dental Models Printed with Stereolithography Printer

Purpose: Aim of this study was to compare the trueness of different designed dental models, printed with stereolithography(SLA) dental printer. Methods: A maxillary fantom model was scanned using a 3D-scanner to create the Standard Tessellation Language(STL) file as a reference scan. The reference STL file was exported to Meshmixer program to design two different types of models: a hollow model design with open base and a hollow model design with closed base. Both models have 2-mm external shell thickness and a bar. Each types of design were printed to produce 10 models with SLA-printer. They were scanned with the same 3D-scanner to create STL files. All STL files were superimposed with the reference STL file via surface matching software(Geomagic Control X). To measure the differences between the reference models and printed models, some distances created: intercanine-buccal-cusp distance(B1), interfirst-premolar-buccal-cusp distance(B2) and palatinal-cusp distance(P1), intersecond-premolar-buccal-cusp distance(B3) and palatinal-cusp distance(P2), interfirst-molar-mesiobuccal-cusp distance(B4) and distopalatinal-cusp distance(P3), intersecond-molar-mesiobuccal-cusp distance(B5) and distopalatinal-cusp distance(P4). Statistical analyses were conducted by one-way ANOVA, Mann-Whitney U test, Kruskal-Wallis test(p<0,05). Results: There was a statistically significant difference between B3, P1, P2 and P4 when comparing open and closed base models(p<0,05). In closed base models, B3 and P4 distances are greater than open base models. P1 and P2 distances are less in open base models. In open base models, B1 distance is greater than B3 and B5 distances and there is no statistical significance in palatinal cusp distances. In closed base models P4 distance is greater than P2 and P3 distances and there is no statistical significance in buccal cusp distances. Conclusion: Trueness of SLA printed models are affected by the base part: open or closed. Open base models have greater trueness at posterior region in buccal and palatinal areas. Closed base models have greater trueness at anterior region in palatinal areas.

Ayşe Lengerli
Yeditepe Üniversitesi
Turkey

Nuray Çapa
Yeditepe Üniversitesi
Turkey

 


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