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Comparison of the accuracy of domestic dental intra-oral scanner(e-scanner) and model scanner (국산 치과용 구강스캐너(e-scanner)와 모델스캐너의 정확도 비교)

  • Kim, Busob;Kim, Jungho
    • Journal of Technologic Dentistry
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    • v.41 no.2
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    • pp.53-61
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    • 2019
  • Purpose: The purpose of this study is to evaluate the discrepancy of scan process in dental intra oral scanner by comparing model scanner and anticipate possibility to introduce intra oral scan technique. Methods: 3D superimposition test was conducted to compare the scan discrepancy. The scanners used in this study are the e-oral scanner, the D750 model scanner, and the high precision CMM(3D Coordinate Measuring Machine). The standard of accuracy verification is ISO 5725-1; trueness and precision. Master model was manufactured by dental stone and scanned 5 times by intra oral, model scanner. Reference data was scanned 5 times by high accuracy CMM to evaluate the trueness. Results: Trueness of D750 scanner were $7.4{\mu}m$ $5.1{\mu}m$ $6.8{\mu}m$ at an abutment, an occluasal, a specific area. and trueness of e-scanner were $20.2{\mu}m$ $27.4{\mu}m$ $37.8{\mu}m$ at an abutment, an occluasal, a specific area. Precision of D750 scanner was $7.04{\mu}m$, e-scanner was $15.95{\mu}m$. Conclusion: When conducting in vitro test, The mean difference of trueness between e-scanner and D750 were $12.8{\mu}m$ at an abutment area, $22.3{\mu}m$ at an occlusal area, $31.0{\mu}m$ at a specific area and $8.91{\mu}m$ in precision. The scan discrepancies are within the range of clinical acceptance.

Comparison of 2-dimensional marginal and internal fitness for the monolithic zirconia prosthesis using intraoral scanner and extraoral scanner: in vitro (Extraoral scanner와 intraoral scanner를 이용하여 제작된 zirconia crown의 2차원 변연 및 내면 적합도 비교: in vitro)

  • Lee, Tae-Hee;Lee, Ha-Bin;Kim, Ji-hwan
    • Journal of Technologic Dentistry
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    • v.41 no.3
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    • pp.187-193
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    • 2019
  • Purpose: The purpose of this study was to compare two-dimensional fitness of the monolithic zirconia prosthesis by using different type of scanner. Methods: No. 26 abutment tooth of FDI system was selected for the study. Using the extraoral scanner and intraoral scanner, the abutment tooth was scanned 10 times and the scanned files were saved as STL files. CAD/CAM system was used to produce the monolithic zirconia prosthesis. marginal and internal gap of the monolithic zirconia prosthesis were measured by digital microscope(x160) and applied silicone replica technique was applied. t-test, a statistical software, was used to perform data analysis. Results: Marginal gap $mean{\pm}SD$ of the monolithic zirconia prosthesis was $33{\pm}7.5{\mu}m$ with extra oral scanner and $34.7{\pm}11.1{\mu}m$ with intraoral scanner. axial gap mean was $40.5{\pm}3.5{\mu}m$ with extra oral scanner and $44.6{\pm}11.6{\mu}m$ with intraoral scanner. occlusal gap mean was $110.1{\pm}25.4{\mu}m$ with extra oral scanner and $64{\pm}9.7{\mu}m$ with intraoral scanner. Conclusion: In this study, fabricating zirconia prosthesis with different type of scanner was clinically applicable.

Improvement of Reflection Angle of Optical Scanner Utilizing Magnetic Effect (자기효과를 이용한 광 Scanner의 반사각 개선)

  • Kim, Hung-Gun;Park, Kyung-Il;Shin, Kwang-Ho;SaGong, Geon
    • Proceedings of the KIEE Conference
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    • pp.1718-1720
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    • 2004
  • This paper is focused on the improvement of reflection angle of an optical scanner by changing a shape of a torsion bar attached with an optical scanner reflector(mirror). In order to improve the light efficiency of the optical scanner by virtue of the magnetic effect, which tiny magnets are attached under both ends of the optical scanner reflector. and hence the optical scanner reflector was operated in relatively lower driving voltage. By changing the torsion bar's shape I type into S type, we've got the lower resonant frequency(32.5Hz) of an optical scanner than that of conventional one(50Hz). According to these results. The reflection angle of an optical scanner with magnets was much larger in the range of about 14.8$^{circ}$ without a magnet. By making use of a magnetic actuator instead of a conventional electrostatic actuator, the optical scanner was less influenced from outdoor dust or moisture.

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A Study on the recognition of moving objects by segmenting 2D Laser Scanner points (2D Laser Scanner 포인트의 자동 분리를 통한 이동체의 구분에 관한 연구)

  • Lee Sang-Yeop;Han Soo-Hee;Yu Ki-Yun
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • pp.177-180
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    • 2006
  • In this paper we proposed a method of automatic point segmentation acquired by 2D laser scanner to recognize moving objects. Recently, Laser scanner is noticed as a new method in the field of close range 3D modeling. But the majority of the researches are pointed on precise 3D modeling of static objects using expensive 3D laser scanner. 2D laser scanner is relatively cheap and can obtain 2D coordinate information of moving object's surface or can be utilized as 3D laser scanner by rotating the system body. In these reasons, some researches are in progress, which are adopting 2D laser scanner to robot control systems or detection of objects moving along linear trajectory. In our study, we automatically segmented point data of 2D laser scanner thus we could recognize each of the object passing through a section.

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Comparison of accuracy of digital data obtained by intra-oral scanner and extra-oral scanner (구강 내 스캐너와 구강 외 스캐너를 사용하여 취득된 스캔 데이터 정확도 비교)

  • Lee, Jae-Jun;Jeong, Il-Do;Kim, Chong-Myung;Park, Jin-Young;Kim, Ji-Hwan;Kim, Woong-Chul
    • Journal of Technologic Dentistry
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    • v.37 no.4
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    • pp.191-197
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    • 2015
  • Purpose: The purpose of this study was to compare the accuracy of the scan data acquired by the extra-oral and intra-oral scanner. Methods: The maxillary right first molar was made of polymethyl methacrylate(PMMA) specimen. This PMMA specimen was scanned with a engineering scanner and intra-oral scanner. Meanwhile, extra-oral scanner scanned stone die duplicated from PMMA master die. Trueness and precision of scan datas was measured by 3-dimensinal inspection. Independent t-test was conduct to analysis the significant difference(a=0.05). Results: In the trueness analysis, mean of discrepancies were 13.82um for intra oral scanner and 16.84 um for extra-oral scanner. In the precision analysis, mean of discrepancies were 11.72 for inta-oral scanner and 9.2 for extra-oral scanner. Both trueness and precision showed a statistically significant difference (Table 1, p<0.05). Conclusion: Intra-oral scanner can show higher trueness than extra-oral scanner, it has lower precision.

Road marking classification method based on intensity of 2D Laser Scanner (신호세기를 이용한 2차원 레이저 스캐너 기반 노면표시 분류 기법)

  • Park, Seong-Hyeon;Choi, Jeong-hee;Park, Yong-Wan
    • IEMEK Journal of Embedded Systems and Applications
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    • v.11 no.5
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    • pp.313-323
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    • 2016
  • With the development of autonomous vehicle, there has been active research on advanced driver assistance system for road marking detection using vision sensor and 3D Laser scanner. However, vision sensor has the weak points that detection is difficult in situations involving severe illumination variance, such as at night, inside a tunnel or in a shaded area; and that processing time is long because of a large amount of data from both vision sensor and 3D Laser scanner. Accordingly, this paper proposes a road marking detection and classification method using single 2D Laser scanner. This method road marking detection and classification based on accumulation distance data and intensity data acquired through 2D Laser scanner. Experiments using a real autonomous vehicle in a real environment showed that calculation time decreased in comparison with 3D Laser scanner-based method, thus demonstrating the possibility of road marking type classification using single 2D Laser scanner.

Multi-facet 3D Scanner Based on Stripe Laser Light Image (선형 레이저 광 영상기반 다면 3 차원 스캐너)

  • Ko, Young-Jun;Yi, Soo-Yeong
    • Journal of Institute of Control, Robotics and Systems
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    • v.22 no.10
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    • pp.811-816
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    • 2016
  • In light of recently developed 3D printers for rapid prototyping, there is increasing attention on the 3D scanner as a 3D data acquisition system for an existing object. This paper presents a prototypical 3D scanner based on a striped laser light image. In order to solve the problem of shadowy areas, the proposed 3D scanner has two cameras with one laser light source. By using a horizontal rotation table and a rotational arm rotating about the latitudinal axis, the scanner is able to scan in all directions. To remove an additional optical filter for laser light pixel extraction of an image, we have adopted a differential image method with laser light modulation. Experimental results show that the scanner's 3D data acquisition performance exhibited less than 0.2 mm of measurement error. Therefore, this scanner has proven that it is possible to reconstruct an object's 3D surface from point cloud data using a 3D scanner, enabling reproduction of the object using a commercially available 3D printer.

3D Boundary Extraction of A Building Using Terrestrial Laser Scanner (지상라이다를 이용한 건축물의 3차원 경계 추출)

  • Lee, In-Su
    • Spatial Information Research
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    • v.15 no.1
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    • pp.53-65
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    • 2007
  • Terrestrial laser scanner provides highly accurate, 3D images and by sweeping a laser beam over a scene or object, the laser scanner is able to record millions of 3D points' coordinates in a short period, so becoming distinguished in various application fields as one of the representative surveying instruments. This study deals with 3D building boundary extraction using Terrestrial Laser Scanner. The results shows that high accuracy 3D coordinates for building boundaries are possibly acquired fast, but terrestrial laser scanner is a ground-based system, so "no roofs", and "no lower part of building" due to trees and electric-poles, etc. It is expected that the combination of total station, terrestrial laser scanner, airborne laser scanner with aerial photogrammetry will contribute to the acquisition of an effective 3D spatial information.

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Engineering Construction With High-Precision Survey Equipment (3D laser scanner, 3D photo scanner, drone) (고정밀 측량장비(3D 레이저 스캐너, 3D 포토 스캐너, 드론)를 활용한 건축 시공단계의 엔지니어링 적용사례)

  • Krchung, Kwang-Ryang;Lee, Byoung-Do;Kim, Tae-Hyuk
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.133-134
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    • 2019
  • As information and construction technology increases, the demand for sophisticated geometric design grows. Design of buildings is becoming more larger, higher, and complicated every day, requiring much new construction technology to bring the design into reality. Nonetheless, the speed of construction technology development is not as rapid. This study concerns the difficulties of realization of sophisticated geometric design. It aims to suggest using BIM and precision survey equipment during the construction stage of the project is a way to resolve. The study will list how to use BIM as an engineering platform incorporating a photo scanner, a scanner drone, and a 3D scanner in the construction stage of projects, how these progressive projects were able to benefit from the high-construction technology.

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A Study on Improvement of the Measurement Method for Optical Scanner (광학식 스케너의 측정방법 개선에 관한 연구)

  • Joo, M.S.;Kim, M.J.;Lee, S.S.;Kim, S.K.;Jeon, E.C.
    • Proceedings of the KSME Conference
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    • pp.841-847
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    • 2001
  • This study is on the precision of the optical scanner which is suitable for shape modeling and non-contact equipment, comparing with a razer scanner. The optical scanner not only has all merits that non-contact methods have but also improve a veil phenomenon which is a razer scanner's demerits. However, the optical scanner has not been used extensively because the measurements are not very precise and there are not the definite methods of measurement. Hence, this study is to find out how parameters such as camera's hight, angle, luminous intensity, distance to object, and so on have an influence on measuring using the optical scanner and to establish the methods of measuring precision.

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