scholarly journals 3D Printed Dental Models A comparative analysis

2019 ◽  
Vol 56 (1) ◽  
pp. 51-54 ◽  
Author(s):  
Ana Maria Cristina Tancu ◽  
Mihaela Pantea ◽  
Alexandra Totan ◽  
Mihaela Tanase ◽  
Marina Imre
Keyword(s):  
Comparative Analysis ◽  
Clinical Application ◽  
Statistical Evaluation ◽  
Plaster Cast ◽  
Fisher Test ◽  
Intraoral Scanning ◽  
Cast Model ◽  
Dental Models ◽  
3D Printed ◽  
Made In

The aim of this study is to compare two different methods used for obtaining printed dental models -intraoral scanning and extraoral scanning; the comparative analysis was made in correlation to the accuracy of the traditional plaster cast model. Nine dental models were obtained: three plaster cast ones, three printed after intraoral scanning and there printed after impression scanning. A total of 137 measurements (arch and tooth measurements) were done on the three types of models and a statistical evaluation was performed (t-test, Fisher Test). Our results highlighted that 3D printed dental models represent a reliable option for clinical application.

scholarly journals Transportation degrades the quality of plaster cast models in virtual surgical planning -Is it time for direct intraoral scanning?

2020 ◽  
Vol 3 (2) ◽  
pp. 153-159
Author(s):  
Kasper Stokbro ◽  
◽  
Rasmus Hartman-Ryhl ◽  
Marie Kjærgaard Larsen ◽  
Lillian Marcussen
Keyword(s):  
Plaster Cast ◽  
Physical Models ◽  
Orthodontic Appliances ◽  
Digital Models ◽  
Intraoral Scanning ◽  
Cast Model ◽  
Dental Models ◽  
Clinically Significant ◽  
Primary Predictor

The plaster cast model (PCM) needs to precisely reproduce the patient’s dentition to ensure optimal fit of the surgical splint; However, transporting physical models entails a risk of fracture of cusps, brackets or entire models. This study evaluated whether clinically significant differences (>1 mm) exist between the patient’s dentition and the PCM, and whether additional fractures occur from transportation from Odense, Denmark, to Rockhill, USA. This prospective study enrolled 10 orthognathic surgical patients. Three digital models were produced per patient: A direct intraoral scan, a scan of the PCM in Odense, Denmark, and a scan of the PCM at 3D Systems, Rockhill, USA. Primary outcome was distance between 2 sets of digital models. Primary predictor was transportation. The study found only 2 patients with no differences above 1 mm. Fractures occurred more often on brackets compared with teeth (Odds ratio: 5.4; P < .001). Fractures of brackets occurred twice as often on maxillary models (P = .045). Fractures occurred equally often during the 2 transportations. In conclusion, surgical splints produced from PCM could incorporate inaccuracies primarily related to the orthodontic appliances. Therefore, it is recommended to minimize model transportation before digitization and preferably use intraoral scanning to minimize errors. Key words: Orthognathic surgery, Surgical splints, dental models, digital occlusion, intraoral scanner, plaster cast model.

scholarly journals Quantitative Evaluation of Tissue Surface Adaption of CAD-Designed and 3D Printed Wax Pattern of Maxillary Complete Denture

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Hu Chen ◽  
Han Wang ◽  
Peijun Lv ◽  
Yong Wang ◽  
Yuchun Sun
Keyword(s):  
Quantitative Evaluation ◽  
Plaster Cast ◽  
Complete Denture ◽  
3D Scanner ◽  
Manual Method ◽  
Wax Pattern ◽  
Tissue Surface ◽  
Cast Model ◽  
3D Printed ◽  
Cast Surface

Objective. To quantitatively evaluate the tissue surface adaption of a maxillary complete denture wax pattern produced by CAD and 3DP.Methods. A standard edentulous maxilla plaster cast model was used, for which a wax pattern of complete denture was designed using CAD software developed in our previous study and printed using a 3D wax printer, while another wax pattern was manufactured by the traditional manual method. The cast model and the two wax patterns were scanned in the 3D scanner as “DataModel,” “DataWaxRP,” and “DataWaxManual.” After setting each wax pattern on the plaster cast, the whole model was scanned for registration. After registration, the deviations of tissue surface between “DataModel” and “DataWaxRP” and between “DataModel” and “DataWaxManual” were measured. The data was analyzed by pairedt-test.Results. For both wax patterns produced by the CAD&RP method and the manual method, scanning data of tissue surface and cast surface showed a good fit in the majority. No statistically significant (P>0.05) difference was observed between the CAD&RP method and the manual method.Conclusions. Wax pattern of maxillary complete denture produced by the CAD&3DP method is comparable with traditional manual method in the adaption to the edentulous cast model.

scholarly journals Reproducibility of linear measurements performed in dental models from 3D printing

2021 ◽  
Vol 10 (11) ◽  
pp. e344101113370
Author(s):  
Fernanda Latorre Melgaço Maia ◽  
Ademir Franco ◽  
Daphne Azambuja Hatschbach de Aquino ◽  
Luciana Butini Oliveira ◽  
José Luiz Cintra Junqueira ◽  
...  
Keyword(s):  
3D Printing ◽  
Fused Deposition Modeling ◽  
Intraclass Correlation ◽  
Linear Measurements ◽  
Digital Light Processing ◽  
Fused Deposition ◽  
Intraoral Scanning ◽  
Dental Models ◽  
3D Printed

This study aimed to assess the reproducibility of linear measurements performed in dental models produced via intraoral scanning and three-dimensional (3D) printing using digital light processing (DLP) and fused deposition modeling (FDM). A sample of 22 participants was selected for this study. Intraoral scanning was performed in each participant with TRIOS™ (3Shape A/S™, Copenhagen, Denmark) device. The digital models were 3D printed using DLP and FDM techniques. Using a caliper, intraoral linear measurements were performed in situ (on the surface of participant’s teeth) and on the 3D printed models. The measurements taken intraoral and on the models were compared using the Intraclass Correlation Coefficient (ICC). The correlation between measurements taken in situ and on DLP models was poor (<0.4), while between in situ and FDM it ranged from poor to satisfactory (<0.75). Generalized linear model showed that the differences did not reach statistically significant levels (p>0.05). According to Bland-Altman approach, the size of measurements did not bias the outcomes. The intraoral scanning and 3D printing techniques used in this study enabled the reproducibility of linear measurements, however, discrete distortions that might be clinically significant occurred.

scholarly journals Three-dimensional printing for heart diseases: clinical application review

2021 ◽  
Author(s):  
Yanyan Ma ◽  
Peng Ding ◽  
Lanlan Li ◽  
Yang Liu ◽  
Ping Jin ◽  
...  
Keyword(s):  
3D Printing ◽  
Clinical Application ◽  
Heart Diseases ◽  
Three Dimensional ◽  
Convincing Evidence ◽  
Surgical Interventions ◽  
Three Dimensional Printing ◽  
Complex Anatomy ◽  
Precise Understanding ◽  
3D Printed

AbstractHeart diseases remain the top threat to human health, and the treatment of heart diseases changes with each passing day. Convincing evidence shows that three-dimensional (3D) printing allows for a more precise understanding of the complex anatomy associated with various heart diseases. In addition, 3D-printed models of cardiac diseases may serve as effective educational tools and for hands-on simulation of surgical interventions. We introduce examples of the clinical applications of different types of 3D printing based on specific cases and clinical application scenarios of 3D printing in treating heart diseases. We also discuss the limitations and clinically unmet needs of 3D printing in this context.

Comparative analysis of different types of ballistic barrels used in the ammunition researches

2021 ◽  
Vol 70 (1) ◽  
pp. 31-41
Author(s):  
Dawid Goździk ◽  
Bartosz Fikus ◽  
Jacek Kijewski
Keyword(s):  
Comparative Analysis ◽  
Mechanical Engineering ◽  
Flight Path ◽  
Different Types ◽  
Ballistic Properties ◽  
Ballistic Tests ◽  
Made In ◽  
Gas Pressures

Manufacturers offer different types of ballistic barrels made in according to various standards. The paper presents comparison of three types of ballistic barrels: pressure, velocity and accuracy made according to C.I.P. and NATO EPVAT standards. Projectile velocities in a several measuring points on the flight path and propellant gas pressures in the barrels were measured and compared. The main aim of the article is to discuss whether all types of barrels to conduct most ballistic tests are needed, or whether one, the most universal in a specific caliber is enough. Keywords: mechanical engineering, ballistics, firearm, ammunition researches, ballistic properties

scholarly journals The Business Service Sector in India, Ireland and Poland. A Comparative Analysis

2019 ◽  
Vol 22 (2) ◽  
pp. 159-172
Author(s):  
Arkadiusz Mroczek
Keyword(s):  
Comparative Analysis ◽  
Service Sector ◽  
Operating Conditions ◽  
Business Service ◽  
Literature Study ◽  
Location Factors ◽  
Current Growth ◽  
Characteristic Features ◽  
Selection Of ◽  
Made In

The fast growth of the service sector is one of the characteristic features of the contemporary economy. Amongst other CEE countries, Poland is one of the emerging locations for this sector. The aim of the paper is to examine and compare the business service sector in India, Ireland and Poland. Both India and Ireland are exceptional locations for this industry, so comparing the state and operating conditions in Poland with those countries can be insightful. A literature study is used to determine the motives of companies undertaking offshore investments, upon which a selection of location factors is made. In the empirical part, those factors are analyzed in a descriptive way. This allows us to draw conclusions concerning this sector in Poland. This country, to some extent, possesses selected positive features of both India and Ireland, which explains the current growth of the sector.

scholarly journals Functioning of the Clothing Networks on the Global Markets - Comparative Analysis

2012 ◽  
Vol 14 (3) ◽  
pp. 87-100
Author(s):  
Monika Malinowska-Olszowy
Keyword(s):  
Comparative Analysis ◽  
Marketing Mix ◽  
Marketing Strategies ◽  
Point Of View ◽  
Global Markets ◽  
Distribution Costs ◽  
Production And Distribution ◽  
Global Companies ◽  
Marketing Mix Strategy ◽  
Made In

The globalisation process contributes to shaping of many diverse consequences, among others it causes the internationalization of production, new, global division of work, increase of competitiveness, it builds the branches of a globalising business. From the point of view of economy, the phenomenon of globalisation influences the deepening of a free float of commodities, services, resources, capital, work, and also information between the countries. These factors significantly contribute to many changes that are visible in the operations of the latter-day enterprises (Penc 2003, p. 152). One of the consequences of the globalisation process, which is directly connected with the functioning of companies, is the necessity of building and managing the brand. As a result it creates many possibilities to global companies from the textile-clothing sector that want to achieve a market success. However, in order to achieve it one has to fulfill many, constantly increasing, expectations of the buyers. The realisation of these challenges is possible only with the share of two crucial factors: proper competitiveness and progressive marketing strategies. In the clothing sector the partnership networks are being created between the economic subject, because such actions are aimed at minimising the risk, as well as to reducing the production and distribution costs. The most often encountered networks in the textile-clothing branch are the franchising networks. The present article concentrates on the competitiveness aspect of the global clothing networks. A comparative analysis of the action of the commercial clothing networks was made, in order to show some features of its operation and proceeding, while focusing on the specified elements of the marketing-mix strategy. The obtained results allowed to show the differences and similarities in the used marketing strategies.

scholarly journals Comparative analysis of methods to determine deflection in steel beams: theoretical analysis, finite element and experimental

2020 ◽  
pp. 32-37
Author(s):  
Gabriela Alor-Saavedra ◽  
Francisco Alejandro Alaffita-Hernández ◽  
Beatris Adriana Escobedo-Trujillo ◽  
Oscar Fernando Silva-Aguilar
Keyword(s):  
Differential Equation ◽  
Experimental Data ◽  
Finite Element ◽  
Comparative Analysis ◽  
Theoretical Analysis ◽  
Comparative Study ◽  
Steel Beams ◽  
Physical Systems ◽  
Theoretical Part ◽  
Made In

This work makes a comparative study of two methods to determine deflection in steel beams: (a) Theoretical and (b) Finite element. For method (a) the solution of the differential equation associated with the modeling of the deflection of a beam is found, while for method (b) a simulation is made in Solidworks. Both methods are compared with experimental data in order to analyze which of the methods presents less uncertainty and show the usefulness of the theoretical part in the modeling of physical systems.

scholarly journals A Comparative Analysis of the Physical Modelling of Two Methods of Balls Separation

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7126
Author(s):  
Łukasz Wójcik ◽  
Zbigniew Pater ◽  
Tomasz Bulzak ◽  
Janusz Tomczak ◽  
Konrad Lis
Keyword(s):  
Comparative Analysis ◽  
Physical Modelling ◽  
Rolling Process ◽  
Model Material ◽  
Physical Analysis ◽  
Real Process ◽  
Radial Forces ◽  
3D Printed ◽  
Torque Values ◽  
Skew Rolling

The article presents the results of model tests with which a comparative analysis of two methods of ball separation during the skew rolling process was carried out. A verification of the results obtained in the physical modelling process with the results obtained in the real process of skew ball rolling was also carried out. During the physical modelling, the effect of changing the ball separation method on the quality of the products obtained, variations in maximum torque values and maximum radial forces were analyzed. In the case of real tests, the results were verified with the results of physical modelling, in which the surface quality and torque values for one of the tool sets were compared. Physical modelling was used to verify the differences between the two methods of ball separation. Commercial plasticine based on synthetic wax from the manufacturer PRIMO was used as a model material for physical analysis. The plasticine used for testing was cooled to 0 °C and the cooling process took 24 h. The tools used for the physical modelling were 3D printed and the material used was ABS. The method of physical modelling using plasticine as a model material allows for a correct analysis of hot metal forming processes.

scholarly journals Hollywood y la Guerra Civil española: análisis de sus tres únicas cintas de ficción coetáneas (1937-1938) = Hollywood and the Spanish Civil War: analysis of its only three fiction films made simultaneously (1937-1938)

2017 ◽  
pp. 75
Author(s):  
Carmen Guiralt Gomar
Keyword(s):  
Comparative Analysis ◽  
Civil War ◽  
Spanish Civil War ◽  
Made In ◽  
William Dieterle

<p>El presente artículo propone un análisis comparativo de las tres únicas películas realizadas por Hollywood sobre la Guerra Civil española mientras esta se desarrollaba: <em>The Last Train From Madrid</em> (James Hogan, 1937), <em>Love Under Fire</em> (George Marshall, 1937) y <em>Blockade</em> (William Dieterle, 1938). A la postre, se demostrará que, en contra de lo afirmado por buena parte de la historiografía, las tres –y no únicamente <em>Blockade</em>– efectúan una denuncia de la intervención de las potencias del Eje en la Guerra Civil española.</p><p>The purpose of this article is to provide a comparative analysis of the only three films that were made in Hollywood relating to the Spanish Civil War during the period in which it was being waged: <em>The </em><em>Last Train From Madrid</em> (James Hogan, 1937), <em>Love Under Fire</em> (George Marshall, 1937) and <em>Blockade </em>(William Dieterle, 1938). Lastly, it will be demonstrated that, contrary to what has been asserted by a large num- ber of historians, all three – not only Blockade – express criticism against the Axis powers’ intervention in the Spanish Civil War.<br /><br /></p>

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