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Digital impression devices are used alternatively to conventional impression techniques and materials. The aim of this study was to evaluate the precision of extraoral digitalization of three types of photosensitive resin polymers used for 3D printing with the aid of a digital extraoral optical scanner. The alignment of the scans was performed by a standard best-fit alignment. Trueness and precision were used to evaluate the models. The trueness was evaluated by using bias as a measure and the standard deviation was used to evaluate the precision. After assessing the normality of the distributions, an independent Kruskal–Wallis test was used to compare the trueness and precision across the material groups. The Mann–Whitney test was used as a post-hoc test for significant differences. The result of the analysis showed significant differences (U = 66, z = −2.337, p = 0.019) in trueness of mesiodistal distances. Upon visual inspection of the models, defects were noticed on two out of nine of the models printed with a photosensitive polymer. The defects were presented as cavities caused by air bubbles and were also reflected in the scans. Mean precision did not vary too much between these three photosensitive polymer resins, therefore, the selection of 3D printing materials should be based on the trueness and the required precision of the clinical purpose of the model.
Eugen Bud; Vlad Bocanet; Mircea Muntean; Alexandru Vlasa; Sorana Bucur; Mariana Păcurar; Bogdan Dragomir; Cristian Olteanu; Anamaria Bud. Accuracy of Three-Dimensional (3D) Printed Dental Digital Models Generated with Three Types of Resin Polymers by Extra-Oral Optical Scanning. Journal of Clinical Medicine 2021, 10, 1908 .
AMA StyleEugen Bud, Vlad Bocanet, Mircea Muntean, Alexandru Vlasa, Sorana Bucur, Mariana Păcurar, Bogdan Dragomir, Cristian Olteanu, Anamaria Bud. Accuracy of Three-Dimensional (3D) Printed Dental Digital Models Generated with Three Types of Resin Polymers by Extra-Oral Optical Scanning. Journal of Clinical Medicine. 2021; 10 (9):1908.
Chicago/Turabian StyleEugen Bud; Vlad Bocanet; Mircea Muntean; Alexandru Vlasa; Sorana Bucur; Mariana Păcurar; Bogdan Dragomir; Cristian Olteanu; Anamaria Bud. 2021. "Accuracy of Three-Dimensional (3D) Printed Dental Digital Models Generated with Three Types of Resin Polymers by Extra-Oral Optical Scanning." Journal of Clinical Medicine 10, no. 9: 1908.
The COVID pandemic has touched many aspects of everyone’s life. Education is one of the fields greatly affected by it, as students and teachers were forced to move online and quickly adapt to the online environment. Assessment is a crucial part of education, especially in STEM fields. A gap analysis was performed by expert groups in the frame of an Erasmus+ project looking at the practices of six European countries. Specialists teaching university-grade mathematics in seven European institutions were asked about their perception of gaps in the assessment of students both before (2019) and during (2021) the pandemic. This qualitative study looks at the difference in perception of such gaps after almost one year of online teaching. The analysis of their responses showed that some gaps were present before the pandemic, as well as others that are specific to it. Some gaps, such as the lack of IT infrastructure and the need to adapt materials to an online environment, have been exacerbated by the outbreak.
Vlad Bocanet; Ken Brown; Anne Uukkivi; Filomena Soares; Ana Lopes; Anna Cellmer; Carles Serrat; Cristina Feniser; Florina Serdean; Elena Safiulina; Gerald Kelly; Joanna Cymerman; Igor Kierkosz; Volodymyr Sushch; Marina Latõnina; Oksana Labanova; M. Bruguera; Chara Pantazi; M. Estela. Change in Gap Perception within Current Practices in Assessing Students Learning Mathematics. Sustainability 2021, 13, 4495 .
AMA StyleVlad Bocanet, Ken Brown, Anne Uukkivi, Filomena Soares, Ana Lopes, Anna Cellmer, Carles Serrat, Cristina Feniser, Florina Serdean, Elena Safiulina, Gerald Kelly, Joanna Cymerman, Igor Kierkosz, Volodymyr Sushch, Marina Latõnina, Oksana Labanova, M. Bruguera, Chara Pantazi, M. Estela. Change in Gap Perception within Current Practices in Assessing Students Learning Mathematics. Sustainability. 2021; 13 (8):4495.
Chicago/Turabian StyleVlad Bocanet; Ken Brown; Anne Uukkivi; Filomena Soares; Ana Lopes; Anna Cellmer; Carles Serrat; Cristina Feniser; Florina Serdean; Elena Safiulina; Gerald Kelly; Joanna Cymerman; Igor Kierkosz; Volodymyr Sushch; Marina Latõnina; Oksana Labanova; M. Bruguera; Chara Pantazi; M. Estela. 2021. "Change in Gap Perception within Current Practices in Assessing Students Learning Mathematics." Sustainability 13, no. 8: 4495.
Romanian consumers have started to buy and consume more organic products. Their decision-making process is influenced by multiple variables. The theory of planned behaviour is widely accepted and used to predict behaviours in certain contexts, including the buying of organic food products. Other researchers have identified values that the consumer of organic products hold and that influence their buying behaviour. This study analyses the factors that have an impact on buying intention and behaviour of Romanian organic products from these two perspectives. A proposed model was designed by combining the two frameworks. It was evaluated by using structural equation modelling with the SmartPLS 3 software package (v. 3.2.7, SmartPLS GmbH, Bönningstedt, Germany, 2017). Results confirm the model proposed in the theory of planned behaviour while integrating the relationships of consumer values. Health consciousness was found to have a significant effect both on buying intention as well as on personal attitude. Food safety has a significant effect on buying intention regardless of personal attitude. Environmental concerns, social consciousness, perception of quality and lifestyle although important in personal attitude, do not affect buying intention directly.
Cristina Fleșeriu; Smaranda Adina Cosma; Vlad Bocăneț. Values and Planned Behaviour of the Romanian Organic Food Consumer. Sustainability 2020, 12, 1722 .
AMA StyleCristina Fleșeriu, Smaranda Adina Cosma, Vlad Bocăneț. Values and Planned Behaviour of the Romanian Organic Food Consumer. Sustainability. 2020; 12 (5):1722.
Chicago/Turabian StyleCristina Fleșeriu; Smaranda Adina Cosma; Vlad Bocăneț. 2020. "Values and Planned Behaviour of the Romanian Organic Food Consumer." Sustainability 12, no. 5: 1722.
This article presents the stages and problems that can arise from the design to the realization of a part obtained through the process of injection. The model part used in the research is a part used in the automotive industry made on a large scale. The material from which the workpiece is made is a polymer that is part of the Polyamide class namely Polyamide 6.6 armed with short fiberglass (SGFR-PA 6.6). The fiberglass arming was made at a 30% rate, resulting in a significant increase in the mechanical characteristics of the workpiece. The validation of the flow in the injection mold was done using Moldflow Adviser™. Due to the contraction of the material, different problems of the injected parts may occur, which endanger their proper functioning. Measurements were done by using a GOM ATOS™ optical scanner. The scanned part was compared with the CAD model and the deviations were observed.
Vlad Bocăneț; Adrian Popescu; Cristina Fenișer; Iulian Tamba. Study on the design and execution of a short fiber reinforced polyamide part. MATEC Web of Conferences 2019, 299, 06006 .
AMA StyleVlad Bocăneț, Adrian Popescu, Cristina Fenișer, Iulian Tamba. Study on the design and execution of a short fiber reinforced polyamide part. MATEC Web of Conferences. 2019; 299 ():06006.
Chicago/Turabian StyleVlad Bocăneț; Adrian Popescu; Cristina Fenișer; Iulian Tamba. 2019. "Study on the design and execution of a short fiber reinforced polyamide part." MATEC Web of Conferences 299, no. : 06006.
The field of extracting 3D information from photographs also known as photogrammetry has a wide range of applications, even in industry. It can be used to rapidly prototype a part with a decent precision. This paper analyses this possibility for a gas regulator that was cut in half. From the pictures taken of the part, a point-cloud can be generated that can be transformed in a mesh and subsequently in a CAD model. Alternatively, it can be compared with an existing CAD model to determine deviations.
Vlad Bocanet; Marius Bulgaru; Vlad Pop. Low-cost industrial photogrammetry for rapid prototyping. MATEC Web of Conferences 2017, 137, 06001 .
AMA StyleVlad Bocanet, Marius Bulgaru, Vlad Pop. Low-cost industrial photogrammetry for rapid prototyping. MATEC Web of Conferences. 2017; 137 ():06001.
Chicago/Turabian StyleVlad Bocanet; Marius Bulgaru; Vlad Pop. 2017. "Low-cost industrial photogrammetry for rapid prototyping." MATEC Web of Conferences 137, no. : 06001.
The current paper describes the application of the Six Sigma methodology for reducing the number of scrapped parts on the manufacturing line at Start Transmission Comp. The paper shows how the five steps of the method, namely Definition, Measurement and Analysis, Improvement and Control, are applied, as well as the methods and quality tools used.
Marius Bulgaru; Lucian Fulea; Marian Borzan; Vlad Bocăneț; Silviu Ilas. Using Six Sigma Methodology to Reduce Nonconformities. Applied Mechanics and Materials 2015, 809-810, 1287 -1292.
AMA StyleMarius Bulgaru, Lucian Fulea, Marian Borzan, Vlad Bocăneț, Silviu Ilas. Using Six Sigma Methodology to Reduce Nonconformities. Applied Mechanics and Materials. 2015; 809-810 ():1287-1292.
Chicago/Turabian StyleMarius Bulgaru; Lucian Fulea; Marian Borzan; Vlad Bocăneț; Silviu Ilas. 2015. "Using Six Sigma Methodology to Reduce Nonconformities." Applied Mechanics and Materials 809-810, no. : 1287-1292.