Banca de DEFESA: MARCELLA GUEDES PEREIRA GOUVÊA BEZERRA
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.STUDENT : MARCELLA GUEDES PEREIRA GOUVÊA BEZERRA
DATE: 23/08/2022
TIME: 15:00
LOCAL: DEPARTAMENTO DE ODONTOLOGIA - SALA DE AULAS III
TITLE:
INFLUENCE OF THE BUILD ANGLE AND THICKNESS OF THE PRINTING LAYER ON THE FLEXURAL STRENGTH, DIMENSIONAL ACCURACY AND ROUGHNESS OF PRINTED RESIN
KEY WORDS:
3D printing, printed resin, angulation, layer thickness.
PAGES: 35
BIG AREA: Ciências da Saúde
AREA: Odontologia
SUBÁREA: Clínica Odontológica
SUMMARY:
Objective: To evaluate the influence of printing layer angulation and thickness on three-point flexural strength (s), dimensional stability and roughness of printed provisional resin. Methodology: From the modeling of a bar (26 x 2.2 x 2.2mm) in Meshmixer software (Autodesk) and obtaining an STL file, it was exported to the SLA 3D printer software (Forms2/Formlabs), where 225 bars of the same dimensions were printed with Cosmos Temp resin, Yller (n=15) according to the factors “printing layer thickness” (25μm;50μm;100μm) and “angulation”(00; 300; 450; 600 and 900). After printing, the samples were cleaned with isopropyl alcohol and sent to post-processing in an ultraviolet oven (Anycubic Wash and Cure Plus, Anycubic) for 15 minutes. The bars were submitted to the s test in a universal testing machine (100KgF,1mm/min) and the data (MPa) analyzed with 2-way ANOVA, Tukey (5%) and Weibull analysis. Roughness and dimensional stability analyzes were also performed (data analyzed by 2-way ANOVA and Tukey test (5%) and surface SEM. Results: For flexural strength, 2-way ANOVA revealed that the factor “Print layer thickness” (p<0.0001) was statistically significant, while the factor “Angulation” (p=0.8074) was not statistically significant. The 25μm thickness showed the highest values of s (47.29AMPa). 25μm (51.2±4.6AMPa), 60°/25μm (49.1±4.3ABMPa), 0°/25μm (48.6±6.6ABMPa), 90°/50μm (46.8±4.1ABCMPa) and 90°/25μm (46.2±4.9ABCMPa) showed s values statistically higher than the 0°/100μm (39.4±5.4DEFMPa), 60°/100μm (37.7±4.2DEFMPa), 90°/100μm (37.1±4.1EFMPa) and 30°/100μm (34.8±4.5FMPa), which were similar to each other. For dimensional stability, the thickness 25μm (1100.3Aμm) and angulation 0° (11571Aμm) showed greater dimensional changes. The groups 0°/50μm (1746.9±61.80Aμm) and 0°/100μm (1704.7±84.30Aμm) showed the greatest dimensional changes, while the 90°/25μm group (401.1±48.61Gμm) showed the smallest changes. For surface roughness, the thickness of 100μm (0.6452A μm) and the angulations 45° (0.6717Aμm), 30° (0.6193Aμm) and 60° (0.6127Aμm) presented higher values. The 30°/100μm (0.90±0.10Aμm), 45°/100μm (0.79±0.07ABμm) and 60°/100μm (0.88±0.08Aμm) groups were similar and presented the highest values, while the 90°/ 100μm (0.23±0.08F) showed the lowest values. Conclusion: The lower the thickness, the greater the flexural strength, regardless of the chosen angle. For dimensional stability, the smaller the thickness of the printing layer, the greater the dimensional variation, while objects printed vertically (90°) have greater dimensional stability. The greater the thickness, the greater the surface roughness. The 30°, 45° and 60° angles have rougher surfaces, while the 90° angles are smoother.
COMMITTEE MEMBERS:
Presidente - 1640419 - RODRIGO OTHAVIO DE ASSUNCAO E SOUZA
Externo ao Programa - 1031499 - LAERCIO ALMEIDA DE MELO - UFRNExterno à Instituição - ANDRE ULISSES DANTAS BATISTA - UFPB