Mechanical and microstructural analysis of a new model of attachments for overdentures retained by mini-implants obtained by 3D printing with three different polymers.

Autor: de Campos, Murilo Rodrigues, Kreve, Simone, da Silva, Geyson Galo, da Costa Valente, Mariana Lima, dos Reis, Andréa Cândido
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Zdroj: Polymer Bulletin; Feb2024, Vol. 81 Issue 4, p3297-3313, 17p
Abstrakt: This study proposed to evaluate the mechanical and microstructural properties of polymeric attachments manufactured by 3D printing used to retain overdentures. Three polymeric materials were used: acrylonitrile–butadiene–styrene, polyacetal, and polylactic acid. The software Rhinoceros 3D was used to create digital data and the 3D printer Flashforge Creator Pro was used to print the specimens and attachments. To evaluate the fatigue simulation, attachments (n = 10) were inserted and removed from mini-implants Ø 2.0 mm × 10 mm, with a ball-type accessory (MDL; Intra-Lock System, São Paulo, SP) for 2900 insertion/removal cycles. The deformation of the attachments was evaluated by stereomicroscope. Compression, hardness, and roughness properties were analyzed (n = 10) before and after thermocycling. The SEM was performed with a magnification of 250 × and 2000 × (n = 3). Data were collected by two-factor ANOVA with Bonferroni adjustment and Wilcoxon and Kruskal–Wallis nonparametric analysis. Rfter thermocycling, all polymers showed an increase in compressive values (P < 0.05) and surface roughness, except for polylactic acid. For hardness, it was observed lowest values for all polymers after thermocycling (P < 0.05). Polylactic acid and polyacetal showed greater retention values compared to acrylonitrile–butadiene–styrene (P < 0.05). Significant differences were observed in relation to the inner diameter before and after the test (P < 0.05). For surface morphology, small changes were observed after thermocycling. The polymers presented high values for surface roughness and excellent values for compression and hardness properties; acrylonitrile–butadiene–styrene didn't show adequate retention to indicate its use as an overdenture attachment; polyacetal and polylactic acid can be indicated to use as an attachment to retain overdentures and there is greater retention than the control group after 24 months of simulation. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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