scholarly journals Implementasi teknologi digital untuk meningkatkan kualitas sepatu pada Industri Kecil dan Menengah

2019 ◽  
Vol 3 (5) ◽  
pp. 159-164
Author(s):  
Caecilia Sri Wahyuning
Keyword(s):  
Digital Technology ◽  
Shoe Design ◽  
Shoe Last ◽  
Substantial Investment ◽  
Cad Cam ◽  
3D Printers ◽  
3D Scanners ◽  
Cam Systems ◽  
Design And Production

One important aspect in shoe design is a matter of comfort, which is determined by dimensions and the shape of shoe last which is influenced by the design of the master shoe last. The use of 3D scanners, 3D printers, and CAD / CAM systems in the process of master shoe last design and production of shoe last can improve the quality of shoe products. However, the application of technology to the IKM implies the need to increase HR capabilities and substantial investment. This indicates the need for involvement of government and institutions / R & D institutions or universities. Therefore, to improve the design of university competencies in mastering technology, curriculum needs to be designed that refers to the competence of designer work in accordance with the progress / development of digital technology in the process of design and production. Key words: industry 4.0, Small and Medium Industries, master shoe last, quality

A smartphone photogrammetry method for digitizing prosthetic socket interiors

2016 ◽  
Vol 41 (2) ◽  
pp. 210-214 ◽  
Author(s):  
Amaia Hernandez ◽  
Edward Lemaire
Keyword(s):  
3D Model ◽  
Low Cost ◽  
3D Models ◽  
Reconstruction Accuracy ◽  
Linear Measurements ◽  
Prosthetic Socket ◽  
Cad Cam ◽  
3D Scanners ◽  
The Cost ◽  
Cam Systems

Background and Aim: Prosthetic CAD/CAM systems require accurate 3D limb models; however, difficulties arise when working from the person’s socket since current 3D scanners have difficulties scanning socket interiors. While dedicated scanners exist, they are expensive and the cost may be prohibitive for a limited number of scans per year. A low-cost and accessible photogrammetry method for socket interior digitization is proposed, using a smartphone camera and cloud-based photogrammetry services. Technique: 15 two-dimensional images of the socket’s interior are captured using a smartphone camera. A 3D model is generated using cloud-based software. Linear measurements were comparing between sockets and the related 3D models. Discussion: 3D reconstruction accuracy averaged 2.6 ± 2.0 mm and 0.086 ± 0.078 L, which was less accurate than models obtained by high quality 3D scanners. However, this method would provide a viable 3D digital socket reproduction that is accessible and low-cost, after processing in prosthetic CAD software. Clinical relevance The described method provides a low-cost and accessible means to digitize a socket interior for use in prosthetic CAD/CAM systems, employing a smartphone camera and cloud-based photogrammetry software.

scholarly journals Review of Different Materials that can be CAD/CAM Processed Description, chemical composition, indications in dentistry areas

2019 ◽  
Vol 70 (11) ◽  
pp. 4029-4034
Author(s):  
Daniela Popa ◽  
Mariana Constantiniuc ◽  
Kamel Earar ◽  
Veronica Mercut ◽  
Monica Scrieciu ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Glass Ceramics ◽  
Chemical Properties ◽  
Restorative Dentistry ◽  
Physical Chemical ◽  
Cad Cam ◽  
Materials Used ◽  
Cam Systems ◽  
The Ideal ◽  
Design And Production

The objective of this paper is to inform on the indications, appearance and advantages offered by each category of materials used in CAD / CAM technique for different prosthetic restorations.Modern techniques in restorative dentistry include CAD/CAM systems and materials that can be CAD/CAM processed. It is very important to know the physical-chemical properties and the indications of these materials to translate the patient�s wishes to reality providing the ideal restoration. There are a variety of CAD/CAM materials to choose from, all designed to provide efficient restoration design and production. We can choose from available materiales including glass ceramics, nano ceramics, zirconia, hybrid ceramics, BioHPP, in blocks or disks form.

scholarly journals A COMPARATIVE STUDY OF THE ACCURACY OF FIVE CAD-CAM SYSTEMS

2019 ◽  
Author(s):  
Smaranda Buduru ◽  
Bogdan Culic ◽  
Daniel Talmaceanu ◽  
Adorjan Pal
Keyword(s):  
Comparative Study ◽  
Internal Space ◽  
Milling Machine ◽  
Working Hypothesis ◽  
Cad Cam ◽  
Cam Systems

Background and aims. The study aims at comparing the precision of different CAD/CAM systems: original systems built by the same manufacturer as opposed to systems whose components are built by different manufacturers.Methods. We used the same physical cast which was scanned with five different scanners. The design of the PMMA copings was done by the same operator for the five virtual casts. Each coping was milled three times by each milling machine, thus obtaining 75 copings. The internal space was analyzed by scanning the replicas in light body silicone.Results. The results analyzed the vertical marginal space (VMS) at the preparation limit, the axial internal space (AIS) and the internal occlusal space (IOS). For VMS the best results were obtained for scanner no 5 (S5) and milling machine 3 (M3). For AIS the best results were obtained with S4 and M3 combination. For IOS the best results were obtained with S45 and M3 combination.Conclusions. According to the results of the study, we are able to confirm the working hypothesis by stating the following conclusions: the quality of the prosthetic elements obtained through CAD/CAM processing differs depending on the CAD/CAM system used and is influenced by each component of every system individually, both the scanner and the milling unit; changing/switching any component of the CAD/CAM system has an impact on the quality of the resulting prosthetic work, but in an unpredictable manner.

Comparison of 3D printing MJP and FDM technology in dentistry

2020 ◽  
Vol 1 (101) ◽  
pp. 32-40
Author(s):  
J. Taczała ◽  
W. Czepułkowska ◽  
B. Konieczny ◽  
J. Sokołowski ◽  
M. Kozakiewicz ◽  
...  
Keyword(s):  
Dimensional Accuracy ◽  
Fused Deposition Modelling ◽  
Fused Deposition ◽  
Dental Technician ◽  
Cad Cam ◽  
3D Printers ◽  
Plaster Model ◽  
Practical Implications ◽  
Dental Technology

Purpose: Many printers are tempting at low prices, but later their accuracy turns out to be insufficient. The study has included checking the accuracy of printing and reproducing details of 3D printers used in dental technology and dentistry such as MultiJet Printing (ProJet MP3000, 3D Systems) and Fused Deposition Modelling (Inspire S2000, Tiertime). Design/methodology/approach: The 3D prints were created from scans of the maxillary gypsum model with the loss of left premolar. In the test, objects were set to the X and Y-axis. In order to check the dimensional differences after printing, scans of the printed models were superimposed on scans of the plaster model in the GOM Inspect V8 SR1 (Braunschweig, Germany). The focus was on the distance of scans from each other and a deviation map was created for each object. Findings: The average absolute value of deviations for each of models were equalled: FDMfor X-axis 0.06 ± 0.04 mm, for Y-axis 0.07 ± 0.04 mm; MJP- for X-axis- 0.04 ± 0.02 mm, for Y-axis- 0.06 ± 0.02 mm. A chart of arithmetic averages calculated for each tooth for the best printouts in each series show that higher deviation values exist in case of FDM printout. The models printed in the X-axis have smaller values of deviations from those printed in the Y-axis. Practical implications: MultiJet Printing technology can be used to create more precise models than the FDM, but these printouts meet the requirements of dimensional accuracy too. Originality/value: CAD / CAM technology in the future will exist in every dental technology laboratory so it is important to be aware of the way the 3D printers works. By paying attention to the quality of detail reproduction, a Dental Technician is able to choose the best 3D printer for them.

Intelligent Knowledge Assessment for CAD/CAM Systems

2015 ◽  
Vol 1117 ◽  
pp. 287-290
Author(s):  
Jānis Dāboliņš ◽  
Jānis Grundspeņķis
Keyword(s):  
Intelligent Tutoring System ◽  
Intelligent Agent ◽  
Knowledge Assessment ◽  
Multi Agent System ◽  
Successful Completion ◽  
Wide Range ◽  
Cad Cam ◽  
Multi Agent ◽  
Cam Systems

Intelligent tutoring system (ITS) with the possibility to track a user’s / student’s operations into CAD/CAM system would allow gaining a wide range of knowledge about successful or non-successful completion of the task and precision of the result – drawing and/or design. It would be possible to diagnose each stage of a students’ work in any CAD/CAM system. Each action would be traceable and ITS would gain information about the quality of these actions (speed, precision, tools used, coherence and sequence). In this paper for implementation of such systems the intelligent agent paradigm is used and multi agent system is proposed.

ANALYSIS OF THE PRICE OF THE MANUFACTURE OF BATCH PARTS FOR CNC MILLING AUXILIATED BY CAD / CAM SYSTEMS

2018 ◽  
Author(s):  
ERIC RAMALHO FERREIRA DE CARVALHO ◽  
MARCOS VINICYUS OLIVEIRA ◽  
erijanio Silva ◽  
Gutembergy Diniz ◽  
João Dehon Rocha Junior ◽  
...  
Keyword(s):  
Cnc Milling ◽  
Cad Cam ◽  
Cam Systems

scholarly journals Marginal and Internal Fit of Ceramic Prostheses Fabricated from Different Chairside CAD/CAM Systems: An In Vitro Study

2021 ◽  
Vol 11 (2) ◽  
pp. 857
Author(s):  
Keunbada Son ◽  
Kyu-Bok Lee
Keyword(s):  
Computer Aided Design ◽  
In Vitro Study ◽  
Vitro Study ◽  
Marginal Gap ◽  
Significant Difference ◽  
Cad Cam ◽  
Ceramic Crowns ◽  
Internal Fit ◽  
Cam Systems

The purpose of this in vitro study was to evaluate marginal and internal fits of ceramic crowns fabricated with chairside computer-aided design and manufacturing (CAD/CAM) systems. An experimental model based on ISO 12836:2015 was digitally scanned with different intraoral scanners (Omnicam (CEREC), EZIS PO (DDS), and CS3500 (Carestream)). Ceramic crowns were fabricated using the CAD/CAM process recommended by each system (CEREC, EZIS, and Carestream systems; N = 15). The 3-dimensional (3D) marginal and internal fit of each ceramic crown was measured using a 3D inspection software (Geomagic control X). Differences among the systems and various measurements were evaluated using the Kruskal–Wallis test. Statistically significant differences were validated using pairwise comparisons (α = 0.05). Occlusal gaps in the CEREC, EZIS, and Carestream groups were 113.0, 161.3, and 438.2 µm, respectively (p < 0.001). The axial gaps were 83.4, 78.0, and 107.9 µm, respectively. The marginal gaps were 77.8, 99.3, and 60.6 µm, respectively, and the whole gaps were 85.9, 107.3, and 214.0 µm, respectively. Significant differences were observed with the EZIS system compared with the other two systems in terms of the marginal gap sizes. The CEREC system showed no significant differences among the four measured regions. However, the EZIS and Carestream systems did show a statistically significant difference (p < 0.05). All three systems were judged to be capable of fabricating clinically acceptable prostheses, because the marginal gap, which is the most important factor in the marginal fit of prostheses, was recorded to be below 100 µm in all three systems.

scholarly journals Influence of Sequential CAD/CAM Milling on the Fitting Accuracy of Titanium Three-Unit Fixed Dental Prostheses

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1401
Author(s):  
Doo-Bin Song ◽  
Man-So Han ◽  
Si-Chul Kim ◽  
Junyong Ahn ◽  
Yong-Woon Im ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Computer Aided Design ◽  
Dental Prostheses ◽  
Computer Aided ◽  
Cad Cam ◽  
Fixed Dental Prostheses ◽  
Gap Data ◽  
Aided Design ◽  
Fitting Accuracy

This study investigated the fitting accuracy of titanium alloy fixed dental prostheses (FDP) after sequential CAD/CAM (Computer Aided Design/Computer Aided Manufacturing) fabrication. A three-unit FDP model connecting mandibular second premolars and molars was prepared and scanned to fabricate titanium FDPs by CAD/CAM milling. A total of six FDPs were sequentially milled in one titanium alloy disk using a new set of burs every time (n = 4). The fitting accuracy of FDPs was mesiodistally evaluated by a silicone replica technique and the measurement was triplicated at four different locations: MO (marginal opening), MG (marginal gap), AG (axial gap), and OG (occlusal gap). Data were statistically analyzed using ANOVA and Tukey’s HSD test. The fitting accuracy of PMMA (polymethyl methacrylate) FDPs milled using the worn or new bur were evaluated by the same procedure (n = 6). The mean dimensions of titanium FDP for all measuring positions, except for AG, were significantly increased from the third milling. However, no difference was noted between the first FDP and the second FDP milled with the same set of burs. Severe edge chippings were observed in all milling burs. Detrimental effects of the worn burs on the fitting accuracy were demonstrated in the CAD/CAM-milled PMMA FDP. The results recommend proper changing frequency of cutting burs to achieve the quality of fit and predictable outcomes for dental CAD/CAM prostheses.

Machining Feature-Based CAD/CAPP for STEP-NC

2014 ◽  
Vol 598 ◽  
pp. 591-594 ◽  
Author(s):  
Li Yan Zhang
Keyword(s):  
Process Planning ◽  
Manufacturing Process ◽  
Data Transfer ◽  
Operation Planning ◽  
Computer Aided Process Planning ◽  
Machining Feature ◽  
Computer Aided ◽  
Cad Cam ◽  
Feature Based ◽  
Cam Systems

ISO 14649, known as STEP-NC, is new model of data transfer between CAD/CAM systems and CNC machines. In this paper, the modeling based on machining feature is proposed. The machining feature comes from the manufacturing process considering the restriction of machining technology and machining resource. Then the framework for computer aided process planning is presented, where the algorithms of operation planning is studied. The practical example has been provided and results indicate that machining feature based model can integrate with CAPP and STEP-NC seamlessly.

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