Erschienen in:
18.03.2023 | Research
Flexural strength, surface roughness, micro-CT analysis, and microbiological adhesion of a 3D-printed temporary crown material
verfasst von:
Anne Kaline Claudino Ribeiro, Rodrigo Falcão Carvalho Porto de Freitas, Isabelle Helena Gurgel de Carvalho, Larissa Mendonça de Miranda, Nathália Ramos da Silva, Leopoldina de Fátima Dantas de Almeida, Yu Zhang, Adriana da Fonte Porto Carreiro, Rodrigo Othávio de Assunção e Souza
Erschienen in:
Clinical Oral Investigations
|
Ausgabe 5/2023
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Abstract
Objective
To evaluate the thermocycling effect of 3D-printed resins on flexural strength, surface roughness, microbiological adhesion, and porosity.
Materials and methods
150 bars (8 × 2 × 2 mm) and 100 blocks (8 × 8 × 2 mm) were made and divided into 5 groups, according to two factors: “material” (AR: acrylic resin, CR: composite resin, BIS: bis-acryl resin, CAD: CAD/CAM resin, and PRINT: 3D-printed resin) and “aging” (non-aged and aged – TC). Half of them were subjected to thermocycling (10,000 cycles). The bars were subjected to mini-flexural strength (σ) test (1 mm/min). All the blocks were subjected to roughness analysis (Ra/Rq/Rz). The non-aged blocks were subjected to porosity analysis (micro-CT; n = 5) and fungal adherence (n = 10). Data were statistically analyzed (one-way ANOVA, two-way ANOVA; Tukey’s test, α = 0.05).
Results
For σ, “material” and “aging” factors were statistically significant (p < 0.0001). The BIS (118.23 ± 16.26A) presented a higher σ and the PRINT group (49.87 ± 7.55E) had the lowest mean σ. All groups showed a decrease in σ after TC, except for PRINT. The CRTC showed the lowest Weibull modulus. The AR showed higher roughness than BIS. Porosity revealed that the AR (1.369%) and BIS (6.339%) presented the highest porosity, and the CAD (0.002%) had the lowest porosity. Cell adhesion was significantly different between the CR (6.81) and CAD (6.37).
Conclusion
Thermocycling reduced the flexural strength of most provisional materials, except for 3D-printed resin. However, it did not influence the surface roughness. The CR showed higher microbiological adherence than CAD group. The BIS group reached the highest porosity while the CAD group had the lowest values.
Clinical relevance
3D-printed resins are promising materials for clinical applications because they have good mechanical properties and low fungal adhesion.