Dimensional Accuracy Evaluation of 3D - Printed Parts Using a 3D Scanning Surface Metrology Technique

2020 ◽  
Author(s):  
Emmanuelle R. Biglete ◽  
Jennifer C. Dela Cruz ◽  
Marvin S. Verdadero ◽  
Mark Christian E. Manuel ◽  
Allison R. Altea ◽  
...  
Keyword(s):  
Dimensional Accuracy ◽  
3D Scanning ◽  
Surface Metrology ◽  
Accuracy Evaluation ◽  
3D Printed

scholarly journals Dimensional Accuracy of Dental Models for Three-Unit Prostheses Fabricated by Various 3D Printing Technologies

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1550
Author(s):  
Soo-Yeon Yoo ◽  
Seong-Kyun Kim ◽  
Seong-Joo Heo ◽  
Jai-Young Koak ◽  
Joung-Gyu Kim
Keyword(s):  
Surface Roughness ◽  
Three Dimensional ◽  
Dimensional Accuracy ◽  
3D Analysis ◽  
Digital Light Processing ◽  
Test Models ◽  
Reference File ◽  
Significant Difference ◽  
Jet Printing ◽  
3D Printed

Previous studies on accuracy of three-dimensional (3D) printed model focused on full arch measurements at few points. The aim of this study was to examine the dimensional accuracy of 3D-printed models which were teeth-prepped for three-unit fixed prostheses, especially at margin and proximal contact areas. The prepped dental model was scanned with a desktop scanner. Using this reference file, test models were fabricated by digital light processing (DLP), Multi-Jet printing (MJP), and stereo-lithography apparatus (SLA) techniques. We calculated the accuracy (trueness and precision) of 3D-printed models on 3D planes, and deviations of each measured points at buccolingual and mesiodistal planes. We also analyzed the surface roughness of resin printed models. For overall 3D analysis, MJP showed significantly higher accuracy (trueness) than DLP and SLA techniques; however, there was not any statistically significant difference on precision. For deviations on margins of molar tooth and distance to proximal contact, MJP showed significantly accurate results; however, for a premolar tooth, there was no significant difference between the groups. 3D color maps of printed models showed contraction buccolingually, and surface roughness of the models fabricated by MJP technique was observed as the lowest. The accuracy of the 3D-printed resin models by DLP, MJP, and SLA techniques showed a clinically acceptable range to use as a working model for manufacturing dental prostheses

scholarly journals Automotive weather strip manufacturing: Process modeling and extrudate dimensional accuracy evaluation

Procedia CIRP ◽  
2018 ◽  
Vol 72 ◽  
pp. 375-380 ◽  
Author(s):  
P. Stavropoulos ◽  
H. Alexopoulos ◽  
A. Papacharalampopoulos ◽  
D. Mourtzis
Keyword(s):  
Process Modeling ◽  
Manufacturing Process ◽  
Dimensional Accuracy ◽  
Accuracy Evaluation

scholarly journals Quality Performance Evaluation of Thin Walled PLA 3D Printed Parts Using the Taguchi Method and Grey Relational Analysis

2020 ◽  
Vol 4 (2) ◽  
pp. 47 ◽  
Author(s):  
Kyriaki-Evangelia Aslani ◽  
Dimitrios Chaidas ◽  
John Kechagias ◽  
Panagiotis Kyratsis ◽  
Konstantinos Salonitis
Keyword(s):  
Surface Roughness ◽  
Wall Thickness ◽  
Grey Relational Analysis ◽  
Dimensional Accuracy ◽  
Optimization Techniques ◽  
Extraction Temperature ◽  
Quality Performance ◽  
Relational Analysis ◽  
3D Printed ◽  
Grey Relational

This paper investigates the quality performance of FDM 3D printed models with thin walls. The design of experiments method (DOE) was used and nine models of the same size were fabricated in a low-cost 3D printer using polylactic acid (PLA) material. Two limited studied parameters were considered (extraction temperature and wall thickness), each one having three levels. External X and Y dimensions were measured using a micrometer, as well as four surface roughness parameters (Ra, Rz, Rt, Rsm) with a surface tester. Two optimization techniques (the Taguchi approach and Grey relational analysis) were utilized along with statistical analysis to examine how the temperature and wall thickness affect the dimensional accuracy and the surface quality of the parts. The results showed that high extraction temperature and median wall thickness values optimize both dimensional accuracy and surface roughness, while temperature is the most important factor.

Study the precision of fixed partial dentures of Co-Cr alloys cast over 3D printed prototypes

2018 ◽  
Vol 1 (90) ◽  
pp. 25-32 ◽  
Author(s):  
Ts. Dikova ◽  
Dzh. Dzhendov ◽  
Iv. Katreva ◽  
Ts. Tonchev
Keyword(s):  
Surface Roughness ◽  
Layer Thickness ◽  
Dimensional Accuracy ◽  
Average Roughness ◽  
Dental Clinics ◽  
Primary Model ◽  
3D Printers ◽  
3D Printed ◽  
The Right ◽  
Printed Patterns

Purpose: of this paper is to investigate the accuracy of Co-Cr dental bridges, manufactured using 3D printed cast patterns. Design/methodology/approach: Four-unit dental bridges are fabricated from the alloys i-Alloy and Biosil-f by lost-wax process. The polymeric cast patterns are 3D printed with different layer’s thickness (13 μm, 35 μm and 50 μm). Two 3D printers are used: stereolithographic “Rapidshape D30” and ink-jet “Solidscape 66+”. The geometrical and fitting accuracy as well as the surface roughness are investigated. Findings: It is established that Co-Cr bridges, casted from 3D printed patterns with 50 μm layer thickness, characterize with the largest dimensions – 3.30%-9.14% larger than those of the base model. Decreasing the layer thickness leads to dimensional reduction. The dimensions of the bridges, casted on patterns with 13 μm layer thickness, are 0.17%-2.86% smaller compared to the primary model. The average roughness deviation Ra of the surface of Co-Cr bridges, manufactured using 3D printed patterns, is 3-4 times higher in comparison to the bridge-base model. The greater the layer thickness of the patterns, the higher Ra of the bridges. The silicone replica test shows 0.1-0.2 mm irregular gap between the bridge retainers and abutments of the cast patterns and Co-Cr bridges. Research limitations/implications: Highly precise prosthetic constructions, casted from 3D printed patterns, can be produced only if the specific features of the 3D printed objects are taken in consideration. Practical implications: Present research has shown that the lower the thickness of the printed layer of cast patterns, the higher the dimensional accuracy and the lower the surface roughness. Originality/value: The findings in this study will help specialist in dental clinics and laboratories to choose the right equipment and optimal technological regimes for production of cast patterns with high accuracy and low surface roughness for casting of precise dental constructions.

scholarly journals Accuracy evaluation of a 3D-printed individual template for needle guidance in head and neck brachytherapy

2016 ◽  
Vol 57 (6) ◽  
pp. 662-667 ◽  
Author(s):  
Ming-Wei Huang ◽  
Jian-Guo Zhang ◽  
Lei Zheng ◽  
Shu-Ming Liu ◽  
Guang-Yan Yu
Keyword(s):  
Head And Neck ◽  
Needle Insertion ◽  
Accuracy Evaluation ◽  
Angular Deviation ◽  
3D Printed ◽  
Radioactive Seeds ◽  
The Mean ◽  
125I Radioactive Seeds ◽  
Time Required

Abstract To transfer the preplan for the head and neck brachytherapy to the clinical implantation procedure, a preplan-based 3D-printed individual template for needle insertion guidance had previously been designed and used. The accuracy of needle insertion using this kind template was assessed in vivo. In the study, 25 patients with head and neck tumors were implanted with 125I radioactive seeds under the guidance of the 3D-printed individual template. Patients were divided into four groups based on the site of needle insertion: the parotid and masseter region group (nine patients); the maxillary and paranasal region group (eight patients); the submandibular and upper neck area group (five patients); and the retromandibular region group (six patients). The distance and angular deviations between the preplanned and placed needles were compared, and the complications and time required for needle insertion were assessed. The mean entrance point distance deviation for all 619 needles was 1.18 ± 0.81 mm, varying from 0.857 ± 0.545 to 1.930 ± 0.843 mm at different sites. The mean angular deviation was 2.08 ± 1.07 degrees, varying from 1.85 ± 0.93 to 2.73 ± 1.18 degrees at different sites. All needles were manually inserted to their preplanned positions in a single attempt, and the mean time to insert one needle was 7.5 s. No anatomical complications related to inaccurately placed implants were observed. Using the 3D-printed individual template for the implantation of 125I radioactive seeds in the head and neck region can accurately transfer a CT-based preplan to the brachytherapy needle insertion procedure. Moreover, the addition of individual template guidance can reduce the time required for implantation and minimize the damage to normal tissues.

Dimensional accuracy of 3D printed vertebra

2014 ◽  
Author(s):  
Kent Ogden ◽  
Nathaniel Ordway ◽  
Dalanda Diallo ◽  
Gwen Tillapaugh-Fay ◽  
Can Aslan
Keyword(s):  
Dimensional Accuracy ◽  
3D Printed

scholarly journals Data driven design: An investigation into the fit between the individuality of people and the uniformity of mass manufactured items

2021 ◽  
Author(s):  
◽  
Alex Svend Christensen
Keyword(s):  
3D Printing ◽  
3D Scanning ◽  
Digital Data ◽  
Human Form ◽  
3 Dimensional ◽  
Manufacturing Efficiency ◽  
3D Printed ◽  
Body Shapes ◽  
The Individual ◽  
Motorcycle Rider

<p>Due to the economic advantage of mass manufacturing technology humans have designed a world of products built for the average body size and shape. This conformity of diverse body shapes to fixed 3 dimensional forms raises the question for this research; how can 3D scanning and additive manufacturing (AM) create a personal fit between an individual’s body and a product?  This question challenges a tool driven standardised approach to manufacture by exploring the interface between a person and a mass produced product, in this case a motorcycle rider and a motorcycle. By taking advantage of digital data and the tool-less build process of 3D printing, every object produced can be different, tailoring it to the customer’s individual aesthetic or physical fit.  This investigation into the space between the motorcycle and the human has produced a custom 3D printed seat designed for and inspired by the unique physicality of the individual rider. The following methods are employed. 3D scanning is used to obtain the geometry of the human form and motorcycle, 3D modelling and 3D printing to generate and evaluate ideas and concepts, and a pressure measurement system to evaluate the riders comfort and fit.  This new relationship between body and object, rarely seen in mass produced products, questions the way we design and make products with consideration towards digital personalisation and manufacturing efficiency.</p>

scholarly journals Additive Manufacturing of Bone Scaffolds Using PolyJet and Stereolithography Techniques

2021 ◽  
Vol 11 (16) ◽  
pp. 7336
Author(s):  
Shummaila Rasheed ◽  
Waqas Akbar Lughmani ◽  
Muhannad Ahmed Obeidi ◽  
Dermot Brabazon ◽  
Inam Ul Ahad
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Dimensional Accuracy ◽  
Human Bone ◽  
Compression Tests ◽  
3D Scaffold ◽  
Bone Scaffolds ◽  
3D Printed ◽  
Printing Direction ◽  
Printing Techniques

In this study, the printing capability of two different additive manufacturing (3D printing) techniques, namely PolyJet and micro-stereolithography (µSLA), are investigated regarding the fabrication of bone scaffolds. The 3D-printed scaffold structures are used as supports in replacing and repairing fractured bone tissue. Printed bone scaffolds with complex structures produced using additive manufacturing technology can mimic the mechanical properties of natural human bone, providing lightweight structures with modifiable porosity levels. In this study, 3D scaffold structures are designed with different combinations of architectural parameters. The dimensional accuracy, permeability, and mechanical properties of complex 3D-printed scaffold structures are analyzed to compare the advantages and drawbacks associated with the two techniques. The fluid flow rates through the 3D-printed scaffold structures are measured and Darcy’s law is applied to calculate the experimentally measured permeability. The Kozeny–Carman equation is applied for theoretical calculation of permeability. Compression tests were performed on the printed samples to observe the effects of the printing techniques on the mechanical properties of the 3D-printed scaffold structures. The effect of the printing direction on the mechanical properties of the 3D-printed scaffold structures is also analyzed. The scaffold structures printed with the µSLA printer demonstrate higher permeability and mechanical properties as compared to those printed using the PolyJet technique. It is demonstrated that both the µSLA and PolyJet printing techniques can be used to print 3D scaffold structures with controlled porosity levels, providing permeability in a similar range to human bone.

Investigations for Wax Coated 3D Printed Hybrid Patterns for Partial Dentures

2019 ◽  
Author(s):  
Kamaljit Singh Boparai ◽  
Gurpartap Singh ◽  
Rupinder Singh ◽  
Sarabjit Singh
Keyword(s):  
Fused Deposition Modeling ◽  
Three Dimensional ◽  
Surface Hardness ◽  
Dimensional Accuracy ◽  
Acrylonitrile Butadiene Styrene ◽  
Processing Technique ◽  
Patient Specific ◽  
Fused Deposition ◽  
3D Printed

Abstract In this work, 3D printed master patterns of acrylonitrile butadiene styrene (ABS) thermoplastic material have been used for the preparation of Ni-Cr based functional prototypes as partial dentures (PD). The study started with patient specific three dimensional (3D), CAD data (fetched through scanning). This data was used for preparation of .STL file for printing of master patterns on fused deposition modeling (FDM) setup. The 3D printed master patterns were further wax coated to reduce the surface irregularities (as cost effective post processing technique). The hybrid patterns were subjected to investment casting for the preparation of Ni-Cr based PD. The finally prepared functional prototypes as PD were optimized for dimensional accuracy, surface finish and surface hardness as responses. The results are visualized and supported by photomicrographs and in-vitro analysis.

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