Alexey Unkovskiy1, Phan Hai-Binh Bui2, Christine Schille2, Juergen Geis-Gerstorfer2, Fabian Huettig3, Sebastian Spintzyk2. 1. Department of Prosthodontics at the Centre of Dentistry, Oral Medicine, and Maxillofacial Surgery with Dental School, Tubingen University Hospital, Osianderstr. 2-8, 72076 Tuebingen, Germany; Department of Dental Surgery, Sechenov First Moscow State Medical University, 8-2 Trubetskaya st., 119991 Moscow, Russia. Electronic address: alexey.unkovskiy@med.uni-tuebingen.de. 2. Section "Medical Materials, Science and Technology" Tuebingen University Hospital, Osianderstr. 2-8, 72076 Tuebingen, Germany. 3. Department of Prosthodontics at the Centre of Dentistry, Oral Medicine, and Maxillofacial Surgery with Dental School, Tubingen University Hospital, Osianderstr. 2-8, 72076 Tuebingen, Germany.
Abstract
OBJECTIVE: To evaluate the influence of printing parameters on flexural properties and accuracy of SLA-printed standard objects. METHODS: Thirty specimens were printed in 0°, 45° and 90° orientation. Fourth nine more specimens were printed evenly on the build platform. forty more specimens were printed and polymerized with three curing unit. Length, height and width was measured three times for each specimen and compared to the original dimensions. Afterwards all specimens underwent a three-point-bending test to assess their flexural properties. One way ANOVA and the Post-Hoc all pairs Tukey-Kramer HSD test were used for data evaluation. RESULTS: The print orientation influences the printing accuracy. The parameters printed along the Z-axis are particularly prone to inaccuracies. Specimens with 45° orientation were found to be the most accurate. Object printed on the borders of build platform a rather prone to inaccuracies than those in the center. The 90° specimens with layer orientation parallel to the axial load showed the superior flexural strength and flexural modulus. The use of different curing unit is unlikely to affect the objects printing accuracy and flexural properties. SIGNIFICANCE: The anisotropical behavior of printed specimens with regards to build orientation and positioning was revealed. The understanding of how the adjustable printing parameter influence the printing outcome is important for a precise fabrication of surgical guides. Inaccuracies up to 10% along the Z-axis, as revealed in the present study,may restrict an accurate implant placement.
OBJECTIVE: To evaluate the influence of printing parameters on flexural properties and accuracy of SLA-printed standard objects. METHODS: Thirty specimens were printed in 0°, 45° and 90° orientation. Fourth nine more specimens were printed evenly on the build platform. forty more specimens were printed and polymerized with three curing unit. Length, height and width was measured three times for each specimen and compared to the original dimensions. Afterwards all specimens underwent a three-point-bending test to assess their flexural properties. One way ANOVA and the Post-Hoc all pairs Tukey-Kramer HSD test were used for data evaluation. RESULTS: The print orientation influences the printing accuracy. The parameters printed along the Z-axis are particularly prone to inaccuracies. Specimens with 45° orientation were found to be the most accurate. Object printed on the borders of build platform a rather prone to inaccuracies than those in the center. The 90° specimens with layer orientation parallel to the axial load showed the superior flexural strength and flexural modulus. The use of different curing unit is unlikely to affect the objects printing accuracy and flexural properties. SIGNIFICANCE: The anisotropical behavior of printed specimens with regards to build orientation and positioning was revealed. The understanding of how the adjustable printing parameter influence the printing outcome is important for a precise fabrication of surgical guides. Inaccuracies up to 10% along the Z-axis, as revealed in the present study,may restrict an accurate implant placement.
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