Assessing the Radiological Density and Accuracy of Mandible Polymer Anatomical Structures Manufactured Using 3D Printing Technologies

Nowadays, 3D printing technologies are among the rapidly developing technologies applied to manufacture even the most geometrically complex models, however no techniques dominate in the area of craniofacial applications. This study included 12 different anatomical structures of the mandible, which were obtained during the process of reconstructing data from the Siemens Somatom Sensation Open 40 system. The manufacturing process used for the 12 structures involved the use of 8 3D printers and 12 different polymer materials. Verification of the accuracy and radiological density was performed with the CT160Xi Benchtop tomography system. The most accurate results were obtained in the case of models manufactured using the following materials: E-Model (Standard Deviation (SD) = 0.145 mm), FullCure 830 (SD = 0.188 mm), VeroClear (SD = 0.128 mm), Digital ABS-Ivory (SD = 0.117 mm), and E-Partial (SD = 0.129 mm). In the case of radiological density, ABS-M30 was similar to spongious bone, PC-10 was similar to the liver, and Polylactic acid (PLA) and Polyethylene terephthalate (PET) were similar to the spleen. Acrylic resin materials were able to imitate the pancreas, kidney, brain, and heart. The presented results constitute valuable guidelines that may improve currently used radiological phantoms and may provide support to surgeons in the process of performing more precise treatments within the mandible area.

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Thermal, structural, and mechanical effects of nanofibrillated cellulose in polylactic acid filaments for additive manufacturing

BioResources ◽

10.15376/biores.15.4.7954-7964 ◽

2020 ◽

Vol 15 (4) ◽

pp. 7954-7964

Author(s):

Diego Gomez-Maldonado ◽

Maria Soledad Peresin ◽

Christina Verdi ◽

Guillermo Velarde ◽

Daniel Saloni

Keyword(s):

Tensile Strength ◽

Additive Manufacturing ◽

3D Printing ◽

Polylactic Acid ◽

Modulus Of Elasticity ◽

Manufacturing Process ◽

Thermal Characterization ◽

Nanofibrillated Cellulose ◽

Small Decrease ◽

The Matrix

As the additive manufacturing process gains worldwide importance, the need for bio-based materials, especially for in-home polymeric use, also increases. This work aims to develop a composite of polylactic acid (PLA) and nanofibrillated cellulose (NFC) as a sustainable approach to reinforce the currently commercially available PLA. The studied materials were composites with 5 and 10% NFC that were blended and extruded. Mechanical, structural, and thermal characterization was made before its use for 3D printing. It was found that the inclusion of 10% NFC increased the modulus of elasticity in the filaments from 2.92 to 3.36 GPa. However, a small decrease in tensile strength was observed from 55.7 to 50.8 MPa, which was possibly due to the formation of NFC aggregates in the matrix. This work shows the potential of using PLA mixed with NFC for additive manufacturing.

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3D printed mask extenders as a supplement to isolation masks to relieve posterior auricular discomfort: an innovative 3D printing response to the COVID-19 pandemic

10.21203/rs.3.rs-31075/v2 ◽

2020 ◽

Author(s):

Zachary O’Connor ◽

Daniel Huellewig ◽

Peeti Sithiyopasakul ◽

Jason Morris ◽

Connie Gan ◽

...

Keyword(s):

3D Printing ◽

Polylactic Acid ◽

Healthcare Workers ◽

Constant Pressure ◽

Healthcare Providers ◽

3D Printer ◽

Institutional Review ◽

3D Printers ◽

3D Printed ◽

Skin Pressure

Abstract Purpose: Many commonly used mask designs are secured by elastic straps looping around the posterior auricular region. This constant pressure and friction against the skin may contribute to increased wearer pain, irritation, and discomfort. The purpose of this work is to report a modified 3D printed mask extender to alleviate discomfort and increase mask wearability by relieving posterior auricular pressure from isolation masks.Methods: Our institutional review board designated this project as non-human research and exempt. As part of resourcing 3D printing laboratories along with individual 3D printers to provide resources to healthcare workers, mask extenders were printed to relieve posterior auricular pressure from individuals wearing isolation masks. The authors modifed an existing mask extender, increasing its length with accompanying peripheral rungs for isolation mask securement. 3D printing was performed with Ultimaker S5 (Ultimaker B.V.; Geldermalsen, Netherlands) and CR-10 (Creality3D; Shenzhen, China) 3D printers using polylactic acid filaments. The author’s modified extended mask extenders were printed and freely delivered to healthcare workers (physicians, nurses, technologists, and other personnel) at the authors’ institution. Results: The final mask extender design was printed with the two 3D printers with a maximum 7 straps printed simultaneously on each 3D printer. Mean print times ranges from 105 minutes for the Ultimaker S5 printer and 150 minutes for the CR-10. 475 mask extenders were delivered to healthcare workers at the authors’ institution, with the demand far exceeding the available supply. Conclusion: We offer a modification of a 3D printed mask extender design that decreases discomfort and increases the wearability of isolation mask designs with ear loops thought to relieve posterior auricular skin pressure and ability to control strap tension. The design is simple, produced with inexpensive material (polylactic acid), and have been well-received by healthcare providers at our institution

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The influence of the post-processing method on knoop hardness of photosensitive resins for 3D SLA printer used in Dentistry

Clinical and Laboratorial Research in Dentistry ◽

10.11606/issn.2357-8041.clrd.2019.161294 ◽

2019 ◽

Author(s):

Mayra Torres Vasques ◽

Julia Nascimento Mulder ◽

Debora Santos Machado ◽

Dalva Cruz Lagana

Keyword(s):

3D Printing ◽

Clinical Relevance ◽

Mechanical Characteristics ◽

Acrylic Resin ◽

Knoop Hardness ◽

Processing Method ◽

3D Printer ◽

Post Processing ◽

Acrylic Resins ◽

3D Printers

Objectives: The aim of this study is to compare the mechanical characteristics of resins for 3D printers with the acrylic resins that have been used in Dentistry, according to the post-processing method. Materials and Methods: Using an SLA 3D printer (Form 2 – Formlabs, Massachusetts, USA), samples (discs) were produced with the printer’s resins, Dental SG®, Dental LT®, Clear®, and Grey®. Samples made of thermopolimerized and auto polymerized acrylic resins were produced as well (Gold Standart parameters). The Knoop Hardness (KH) tests were performed using microdurometer HMV-2 (Shimadzu, Kyoto, Japan). Results: The results showed the Dental SG resin presented the highest KH, compared with thermopolimerized acrylic resin, the Clear and Dental LT resins KH were compared with auto polymerized acrylic resin, and the non-post cured Grey resin (not for intraoral use), as well as the Dental LT resin, showed the lowest KH. Conclusions: Considering the hardness, the printer’s resins are comparable with the acrylic resins established, when the post-processing method is thoroughly followed. The absence of material’s post-processing reduce significantly the material’s hardness. Clinical relevance: Regarding the use of 3D printing in Dentistry, the development of materials adequate for the equipment, biocompatible for intraoral uses, and compatible mechanical proprieties are essential.

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3D printed mask extenders as a supplement to isolation masks to relieve posterior auricular discomfort: an innovative 3D printing response to the COVID-19 pandemic

3D Printing in Medicine ◽

10.1186/s41205-020-00080-7 ◽

2020 ◽

Vol 6 (1) ◽

Author(s):

Zachary O’Connor ◽

Daniel Huellewig ◽

Peeti Sithiyopasakul ◽

Jason A. Morris ◽

Connie Gan ◽

...

Keyword(s):

3D Printing ◽

Polylactic Acid ◽

Healthcare Workers ◽

Constant Pressure ◽

Healthcare Providers ◽

3D Printer ◽

Institutional Review ◽

3D Printers ◽

3D Printed ◽

Skin Pressure

Abstract Purpose Many commonly used mask designs are secured by elastic straps looping around the posterior auricular region. This constant pressure and friction against the skin may contribute to increased wearer pain, irritation, and discomfort. The purpose of this work is to report a modified 3D printed mask extender to alleviate discomfort and increase mask wearability by relieving posterior auricular pressure from isolation masks. Methods Our institutional review board designated this project as non-human research and exempt. As part of resourcing 3D printing laboratories along with individual 3D printers to provide resources to healthcare workers, mask extenders were printed to relieve posterior auricular pressure from individuals wearing isolation masks. The authors modifed an existing mask extender, increasing its length with accompanying peripheral rungs for isolation mask securement. 3D printing was performed with Ultimaker S5 (Ultimaker B.V.; Geldermalsen, Netherlands) and CR-10 (Creality3D; Shenzhen, China) 3D printers using polylactic acid filaments. The author’s modified extended mask extenders were printed and freely delivered to healthcare workers (physicians, nurses, technologists, and other personnel) at the authors’ institution. Results The final mask extender design was printed with the two 3D printers with a maximum 7 straps printed simultaneously on each 3D printer. Mean print times ranges from 105 min for the Ultimaker S5 printer and 150 min for the CR-10. Four hundred seventy-five mask extenders were delivered to healthcare workers at the authors’ institution, with the demand far exceeding the available supply. Conclusion We offer a modification of a 3D printed mask extender design that decreases discomfort and increases the wearability of isolation mask designs with ear loops thought to relieve posterior auricular skin pressure and ability to control strap tension. The design is simple, produced with inexpensive material (polylactic acid), and have been well-received by healthcare providers at our institution.

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3D printed mask extenders: supplement to isolation masks to relieve posterior auricular discomfort

10.21203/rs.3.rs-31075/v1 ◽

2020 ◽

Author(s):

Zachary O’Connor ◽

Daniel Huellewig ◽

Peeti Sithiyopasakul ◽

Jason Morris ◽

Connie Gan ◽

...

Keyword(s):

3D Printing ◽

Polylactic Acid ◽

Healthcare Workers ◽

Constant Pressure ◽

Healthcare Providers ◽

3D Printer ◽

Institutional Review ◽

3D Printers ◽

3D Printed ◽

Skin Pressure

Abstract Purpose Many commonly used mask designs are secured by elastic straps looping around the posterior auricular region. This constant pressure and friction against the skin may contribute to increased wearer pain, irritation, and discomfort. The purpose of this work is to report a modified 3D printed mask extender to alleviate discomfort and increase mask wearability by relieving posterior auricular pressure from isolation masks. Methods Our institutional review board designated this project as non-human research and exempt. As part of resourcing 3D printing laboratories along with individual 3D printers to provide resources to healthcare workers, mask extenders were printed to relieve posterior auricular pressure from individuals wearing isolation masks. The authors modifed an existing mask extender, increasing its length with accompanying peripheral rungs for isolation mask securement. 3D printing was performed with Ultimaker S5 (Ultimaker B.V.; Geldermalsen, Netherlands) and CR-10 (Creality3D; Shenzhen, China) 3D printers using polylactic acid filaments. The author’s modified extended mask extenders were printed and freely delivered to healthcare workers (physicians, nurses, technologists, and other personnel) at the authors’ institution. Results The final mask extender design was printed with the two 3D printers with a maximum 7 straps printed simultaneously on each 3D printer. Mean print times ranges from 105 minutes for the Ultimaker S5 printer and 150 minutes for the CR-10. 475 mask extenders were delivered to healthcare workers at the authors’ institution, with the demand far exceeding the available supply. Conclusion We offer a modification of a 3D printed mask extender design that decreases discomfort and increases the wearability of isolation mask designs with ear loops thought to relieve posterior auricular skin pressure and ability to control strap tension. The design is simple, produced with inexpensive material (polylactic acid), and have been well-received by healthcare providers at our institution

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3D-printing pen versus desktop 3D-printers: Fabrication of carbon black/polylactic acid electrodes for single-drop detection of 2,4,6-trinitrotoluene

Analytica Chimica Acta ◽

10.1016/j.aca.2020.07.034 ◽

2020 ◽

Vol 1132 ◽

pp. 10-19 ◽

Cited By ~ 1

Author(s):

Rafael M. Cardoso ◽

Diego P. Rocha ◽

Raquel G. Rocha ◽

Jéssica S. Stefano ◽

Rodrigo A.B. Silva ◽

...

Keyword(s):

3D Printing ◽

Carbon Black ◽

Polylactic Acid ◽

Single Drop ◽

3D Printers

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3D printed mask extenders as a supplement to isolation masks to relieve posterior auricular discomfort: an innovative 3D printing response to the COVID-19 pandemic

10.21203/rs.3.rs-31075/v3 ◽

2020 ◽

Author(s):

Zachary O’Connor ◽

Daniel Huellewig ◽

Peeti Sithiyopasakul ◽

Jason Morris ◽

Connie Gan ◽

...

Keyword(s):

3D Printing ◽

Polylactic Acid ◽

Healthcare Workers ◽

Constant Pressure ◽

Healthcare Providers ◽

3D Printer ◽

Institutional Review ◽

3D Printers ◽

3D Printed ◽

Skin Pressure

Abstract Purpose: Many commonly used mask designs are secured by elastic straps looping around the posterior auricular region. This constant pressure and friction against the skin may contribute to increased wearer pain, irritation, and discomfort. The purpose of this work is to report a modified 3D printed mask extender to alleviate discomfort and increase mask wearability by relieving posterior auricular pressure from isolation masks.Methods : Our institutional review board designated this project as non-human research and exempt. As part of resourcing 3D printing laboratories along with individual 3D printers to provide resources to healthcare workers, mask extenders were printed to relieve posterior auricular pressure from individuals wearing isolation masks. The authors modifed an existing mask extender, increasing its length with accompanying peripheral rungs for isolation mask securement. 3D printing was performed with Ultimaker S5 (Ultimaker B.V.; Geldermalsen, Netherlands) and CR-10 (Creality3D; Shenzhen, China) 3D printers using polylactic acid filaments. The author’s modified extended mask extenders were printed and freely delivered to healthcare workers (physicians, nurses, technologists, and other personnel) at the authors’ institution.Results: The final mask extender design was printed with the two 3D printers with a maximum 7 straps printed simultaneously on each 3D printer. Mean print times ranges from 105 minutes for the Ultimaker S5 printer and 150 minutes for the CR-10. 475 mask extenders were delivered to healthcare workers at the authors’ institution, with the demand far exceeding the available supply.Conclusion: We offer a modification of a 3D printed mask extender design that decreases discomfort and increases the wearability of isolation mask designs with ear loops thought to relieve posterior auricular skin pressure and ability to control strap tension. The design is simple, produced with inexpensive material (polylactic acid), and have been well-received by healthcare providers at our institution

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Determination parameters of 3D printing patriotic composite polymer materials based on ABS plasticse

Polymer materials and technologies ◽

10.32864/polymmattech-2018-4-2-85-90 ◽

2018 ◽

Vol 4 (2) ◽

pp. 85-90

Author(s):

Y. M. Dovydenko ◽

N. A. Ivanova ◽

S. A. Chizhik ◽

V. E. Agabekov

Keyword(s):

3D Printing ◽

Polymer Materials ◽

Composite Polymer

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Application of Innovative Hydroxyapatite Materials in 3D Printing for Biocompatible Voice Implants

Revista de Chimie ◽

10.37358/rc.18.4.6211 ◽

2018 ◽

Vol 69 (4) ◽

pp. 840-842

Author(s):

Wojciech Musialik ◽

Marcin Nabialek ◽

Slawomir Letkiewicz ◽

Andrei Victor Sandu ◽

Katarzyna Bloch

Keyword(s):

3D Printing ◽

Surgical Procedures ◽

Bacterial Infections ◽

Fungal Infections ◽

Colloidal Silver ◽

Bone Implants ◽

External Ring ◽

Voice Prostheses ◽

3D Printers ◽

Silver Composite

The paper presents the possibility of using an innovative hydroxyapatite filament Ca10(PO4)6(OH)2 for printing in 3D printers of bone implants and the possibility of using it during implantation with voice prostheses. The introduction of an additional colloidal silver composite in voice implants will contribute to the reduction of bacterial infections, fungal infections and granulomatous hyperplasia. The creation of a stable external ring of the vocal fistula will remove complications associated with it with enlargement of the fistula and leakiness of voice implants. The ability to print with a hydroxyapatite filament will allow digital pre-surgery modeling of bone implants suited to the needs of surgical procedures.

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