Influence of Antibacterial Coating and Mechanical and Chemical Treatment on the Surface Properties of PA12 Parts Manufactured with SLS and MJF Techniques in the Context of Medical Applications

Bazan, Anna; Turek, P.; Zakręcki, Andrzej

doi:10.3390/ma16062405

Cited by 10 publications

(4 citation statements)

References 75 publications

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“…The resultant design ensured a balanced pressure distribution, optimizing structural integrity and material usage. The biocompatible material, polyamide—compliant with United States Pharmacopeia and National Formulary class I to VI and US Food and Drug Administration guidelines for skin surface devices, 45 and noted for its rigidity and pliability 30 , 31 —was used in the 3D printing process, making it a popular choice in medical application. 46 , 47 In addition, the inclusion of a porous sponge within the splint aids in preventing skin indentations and augments patient comfort.…”

Section: Discussionmentioning

confidence: 99%

Topology-Optimized Splints vs Casts for Distal Radius Fractures

Ma,

Ruan,

et al. 2024

JAMA Netw Open

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ImportanceTo date, there is currently no evidence-based medical support for the efficacy of topology-optimized splints in treating distal radius fractures.ObjectiveTo assess the clinical efficacy and complication rates of topology-optimized splints in the treatment of distal radius fractures after closed manual reduction.Design, Setting, and ParticipantsThis 12-week, multicenter, open-label, analyst-blinded randomized clinical trial (comprising a 6-week intervention followed by a 6-week observational phase) was carried out from December 3, 2021, to March 10, 2023, among 110 participants with distal radius fractures. Statistical analysis was performed on an intention-to-treat basis between June 3 and 30, 2023.InterventionParticipants were randomly assigned to 2 groups: the intervention group received topology-optimized splint immobilization and the control group received cast immobilization after closed manual reduction for 6weeks. After this period, immobilization was removed, and wrist rehabilitation activities commenced.Main Outcomes and MeasuresThe primary outcome was the Gartland-Werley (G-W) wrist score at 6 weeks (where higher scores indicate more severe wrist dysfunction). Secondary outcomes encompassed radiographic parameters, visual analog scale scores, swelling degree grade, complication rates, and 3 dimensions of G-W wrist scores.ResultsA total of 110 patients (mean [SD] age, 64.1 [12.7] years; 89 women [81%]) enrolled in the clinical trial, and complete outcome measurements were obtained for 101 patients (92%). Median G-W scores at 6 weeks were 15 (IQR, 13-18) for the splint group and 17 (IQR, 13-18) for the cast group (mean difference, −2.0 [95% CI, −3.4 to −0.6]; P = .03), indicating a statistically significant advantage for the splint group. At 12 weeks, no clinically significant differences in G-W scores between the 2 groups were observed. Complication rates, including shoulder-elbow pain and dysfunction and skin irritation, were less common in the splint group (shoulder-elbow pain and dysfunction: risk ratio, 0.28 [95% CI, 0.08-0.93]; P = .03; skin irritation: risk ratio, 0.30 [95% CI, 0.10-0.89]; P = .02).Conclusions and RelevanceFindings of this randomized clinical trial suggest that patients with distal radius fractures that were managed with topology-optimized splints had better wrist functional outcomes and fewer complications at 6 weeks compared with those who received casting, with no difference at week 12. Therefore, topology-optimized splints with improved performance have the potential to be an advisable approach in the management of distal radius fractures.Trial RegistrationChinese Clinical Trial Registry: ChiCTR2000036480

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Section: Discussionmentioning

confidence: 99%

Topology-Optimized Splints vs Casts for Distal Radius Fractures

Ma,

Ruan,

et al. 2024

JAMA Netw Open

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“…Despite the availability of many additive manufacturing methods, none dominate in medical applications. This is due to several factors related to dimensional and geometry accuracy [14,35] and surface roughness [36,37]. Many factors affect the accuracy of fabricated models using additive techniques.…”

Section: Discussionmentioning

confidence: 99%

“…Many factors affect the accuracy of fabricated models using additive techniques. Some of the most significant include the technology used [40,41], the thickness of the print layer [40,42], the orientation of the model in the 3D printer space [43,44], and the type of material [40,45] or finishing treatment used [37]. Recently, more and more models of anatomical structures have been made using material extrusion (MEX) techniques.…”

Section: Discussionmentioning

confidence: 99%

The Process of Digital Data Flow in RE/CAD/RP/CAI Systems Concerning Planning Surgical Procedures in the Craniofacial Area

Turek,

Dudek,

Grzywa

et al. 2024

Knowledge

Self Cite

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This paper presents the process of digital data flow in RE/CAD/RP/CAI systems to develop models for planning surgical procedures in the craniofacial area. At the first RE modeling stage, digital data processing, segmentation, and the reconstruction of the geometry of the anatomical structures were performed. During the CAD modeling stage, three different concepts were utilized. The first concept was used to create a tool that could mold the geometry of the cranial vault. The second concept was created to prepare a prototype implant that would complement the anterior part of the mandibular geometry. And finally, the third concept was used to design a customized prototype surgical plate that would match the mandibular geometry accurately. Physical models were made using a rapid prototyping technique. A Bambu Lab X1 3D printer was used for this purpose. The process of geometric accuracy evaluation was carried out on manufactured prototypes of surgical plates made of ABS+, CPE, PLA+, and PETG material. In the geometric accuracy evaluation process, the smallest deviation values were obtained for the ABS plus material, within a tolerance of ±0.1 mm, and the largest were obtained for CPE (±0.2 mm) and PLA plus (±0.18 mm). In terms of the surface roughness evaluation, the highest value of the Sa parameter was obtained for the PLA plus material, which was 4.15 µm, and the lowest was obtained for the CPE material, equal to 3.62 µm. The knowledge of the flow of digital data and the identification of factors determining the accuracy of mapping the geometry of anatomical structures allowed for the development of a procedure that improves the modeling and manufacturing of anatomical structures within the craniofacial region.

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“…Its response in various types of applications has been reported, for example in 3D-printed thin wall structures [22]. It is thought to be a solid and durable material with a great melting point and minimal coefficient of friction, which is the reason it is a suitable material for functional printing gears, while it is also known for its hygroscopicity [23]. As shown, it is a popular engineering thermoplastic with its use expanded in the AM processes, in vat photopolymerization [24], and powder bed fusion [25].…”

Section: Introductionmentioning

confidence: 99%

Nanocomposites with Optimized Polytetrafluoroethylene Content as a Reinforcement Agent in PA12 and PLA for Material Extrusion Additive Manufacturing

Vidakis,

Petousis,

Moutsopoulou

et al. 2023

Polymers

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Herein, polytetrafluoroethylene (PTFE) is evaluated as a reinforcement agent in material extrusion (MEX) additive manufacturing (AM), aiming to develop nanocomposites with enhanced mechanical performance. Loadings up to 4.0 wt.% were introduced as fillers of polylactic acid (PLA) and polyamide 12 (PA12) matrices. Filaments for MEX AM were prepared to produce corresponding 3D-printed samples. For the thorough characterization of the nanocomposites, a series of standardized mechanical tests were followed, along with AFM, TGA, Raman spectroscopy, EDS, and SEM analyses. The results showed an improved mechanical response for filler concentrations between 2.0 and 3.0 wt.%. The enhancement for the PLA/PTFE 2.0 wt.% in the tensile strength reached 21.1% and the modulus of elasticity 25.5%; for the PA12/PTFE 3.0 wt.%, 34.1%, and 41.7%, respectively. For PLA/PTFE 2.0 wt.%, the enhancement in the flexural strength reached 57.6% and the modulus of elasticity 25.5%; for the PA12/PTFE 3.0 wt.%, 14.7%, and 17.2%, respectively. This research enables the ability to deploy PTFE as a reinforcement agent in the PA12 and PLA thermoplastic engineering polymers in the MEX AM process, expanding the potential applications.

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Influence of Antibacterial Coating and Mechanical and Chemical Treatment on the Surface Properties of PA12 Parts Manufactured with SLS and MJF Techniques in the Context of Medical Applications

Cited by 10 publications

References 75 publications

Topology-Optimized Splints vs Casts for Distal Radius Fractures

Topology-Optimized Splints vs Casts for Distal Radius Fractures

The Process of Digital Data Flow in RE/CAD/RP/CAI Systems Concerning Planning Surgical Procedures in the Craniofacial Area

Nanocomposites with Optimized Polytetrafluoroethylene Content as a Reinforcement Agent in PA12 and PLA for Material Extrusion Additive Manufacturing

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