Investigation of separation force for constrained-surface stereolithography process from mechanics perspective

Ye, Hang; Venketeswaran, Abhishek; Das, Sonjoy; Zhou, Chi

doi:10.1108/rpj-06-2016-0091

Cited by 47 publications

(20 citation statements)

References 23 publications

(47 reference statements)

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“…It gives better surface finish and has lesser wastage of raw material. 11,12 ➢ Selective laser sintering (SLS): In this additive manufacturing technology, it accomplishes sintering with the application of a laser beam. The material used is in the form of powder, and laser sinters the powder.…”

Section: Types Of Additive Manufacturing Technologiesmentioning

confidence: 99%

Current status and applications of additive manufacturing in dentistry: A literature-based review

Javaid

Haleem

2019

Journal of Oral Biology and Craniofacial Research

231

103

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To study the current status and applications of additive manufacturing (AM) in dentistry along with various technologies, benefits and future scope. Methods: A significant number of relevant research papers on the additive manufacturing application in dentistry are identified through Scopus and studied using bibliometric analysis that shows an increasing trend of research in this field. This paper briefly describes various types of AM technologies with their accuracy, pros and cons along with different dental materials. Paper also discusses various benefits of AM in dentistry and steps used to create 3D printed dental model using this technology. Further, ten major AM applications in dentistry are identified along with primary references and objectives. Results: Additive manufacturing is an innovative technique moving towards the customised production of dental implants and other dental tools using computer-aided design (CAD) data. This technology is used to manufacture elaborate dental crowns, bridges, orthodontic braces and can also various other models, devices and instruments with lesser time and cost. With the help of this disruptive innovation, dental implants are fabricated accurately as per patient data captured by the dental 3D scanner. The application of this technology is also being explored for the precise manufacturing of removal prosthetics, aligners, surgical templates for implants and produce models that for the planning of treatment and preoperative positioning of the jaws.

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Section: Types Of Additive Manufacturing Technologiesmentioning

confidence: 99%

Current status and applications of additive manufacturing in dentistry: A literature-based review

Javaid

Haleem

2019

Journal of Oral Biology and Craniofacial Research

231

103

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“…The lift distance L is ~5-10 mm for complete peeling. 26 Using trigonometry and the vat geometry, we conservatively (on the higher side) estimate the peel angle θ as follows:…”

Section: Discussionmentioning

confidence: 99%

A systematic evaluation of medical 3D printing accuracy of multi‐pathological anatomical models for surgical planning manufactured in elastic and rigid material using desktop inverted vat photopolymerization

et al. 2021

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Purpose The dimensional accuracy of three‐dimensional (3D) printed anatomical models is essential to correctly understand spatial relationships and enable safe presurgical planning. Most recent accuracy studies focused on 3D printing of a single pathology for surgical planning. This study evaluated the accuracy of medical models across multiple pathologies, using desktop inverted vat photopolymerization (VP) to 3D print anatomic models using both rigid and elastic materials. Methods In the primary study, we 3D printed seven models (six anatomic models and one reference cube) with volumes ranging from ~2 to ~209 cc. The anatomic models spanned multiple pathologies (neurological, cardiovascular, abdominal, musculoskeletal). Two solid measurement landing blocks were strategically created around the pathology to allow high‐resolution measurement using a digital micrometer and/or caliper. The physical measurements were compared to the designed dimensions, and further analysis was conducted regarding the observed patterns in accuracy. All of the models were printed in three resins: Elastic, Clear, and Grey Pro in the primary experiments. A full factorial block experimental design was employed and a total of 42 models were 3D printed in 21 print runs. In the secondary study, we 3D printed two of the anatomic models in triplicates selected from the previous six to evaluate the effect of 0.1 mm vs 0.05 mm layer height on the accuracy. Results In the primary experiment, all dimensional errors were less than 1 mm. The average dimensional error across the 42 models was 0.238 ± 0.219 mm and the relative error was 1.10 ± 1.13%. Results from the secondary experiments were similar with an average dimensional error of 0.252 ± 0.213 mm and relative error of 1.52% ± 1.28% across 18 models. There was a statistically significant difference in the relative errors between the Elastic resin and Clear resin groups. We explained this difference by evaluating inverted VP 3D printing peel forces. There was a significant difference between the Solid and Hollow group of models. There was a significant difference between measurement landing blocks oriented Horizontally and Vertically. In the secondary experiments, there was no difference in accuracy between the 0.10 and 0.05 mm layer heights. Conclusions The maximum measured error was less than 1 mm across all models, and the mean error was less than 0.26mm. Therefore, inverted VP 3D printing technology is suitable for medical 3D printing if 1 mm is considered the cutoff for clinical use cases. The 0.1 mm layer height is suitable for 3D printing accurate anatomical models for presurgical planning in a majority of cases. Elastic models, models oriented horizontally, and models that are hollow tend to have relatively higher deviation as seen from experimental results and mathematical model predictions. While clinically insignificant using a 1 mm cutoff, further research is needed to better understand the complex physical interactions in VP 3D printing which influence model accuracy.

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“…Ye et al conducted an experiment to investigate the effects of lifting velocities and simulated the separation force profile by using a cohesive zone model. From the perspective of energy and work, the absorbed energy should be proportional to the required separation force [21]. The prediction method of Ye et al can be used for adjusting parameters before printing.…”

Section: Separation Predictionmentioning

confidence: 99%

Spring Assisting Mechanism for Enhancing the Separation Performance of Digital Light Process 3D Printers

Lin

Yang

2019

IEEE Access

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Separation has been a historic problem in digital light process 3D printing, which limits the capability of printing large areas. Over the years, methods for reducing separation force and improving printing quality have primarily relied on changing separation mechanisms and a constrained surface. Most methods require a pulling-up process; however, a few methods can provide the desired lifting distance by themselves. In our previous work, an in-house design named ''spring-assisted mechanism'' using the combination of spring with a tilting mechanism was proposed to adapt to different required separation forces. The spring compression can be used to provide an additional force for separation, which results in a shorter lifting distance when encountering different print areas. In this paper, we aim to investigate the separation performance by comparing the proposed mechanism with a conventional tilting mechanism. The Taguchi method is applied to study the importance of design features of the spring-assisted mechanism. The results indicate that the maximum separation force occurring in the spring-assisted mechanism declines significantly to 89%. An additional benefit of the proposed mechanism is that the lifting distance required for separation can be adjusted automatically to different print areas, and a sufficient separation force is very low. Consequently, this paper provides experimental evidence that the spring-assisted mechanism can be used for large-scale printing. INDEX TERMS DLP 3D printing, separation force, separation time, spring assisting mechanism, Taguchi method. YU-SHENG LIN received the B.Eng. degree from the Department of Mechanical Engineering, I-Shou University, the M.Sc. degree from the

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Investigation of separation force for constrained-surface stereolithography process from mechanics perspective

Cited by 47 publications

References 23 publications

Current status and applications of additive manufacturing in dentistry: A literature-based review

Current status and applications of additive manufacturing in dentistry: A literature-based review

A systematic evaluation of medical 3D printing accuracy of multi‐pathological anatomical models for surgical planning manufactured in elastic and rigid material using desktop inverted vat photopolymerization

Spring Assisting Mechanism for Enhancing the Separation Performance of Digital Light Process 3D Printers

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