• 대한치과보철학회지
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• 제56권3호
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• pp.188-198
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• 2018

목적: 최근 디지털 기술의 발달과 더불어 치과영역에서도 다양한 보철물 제작을 위해 Computer aided design/computer aided manufacture (CAD/CAM) 시스템의 사용이 확대되고 있다. CAD/CAM 시스템은 전통적인 방식의 보철물 제작의 단점을 극복하여, 치과의사와 치기공사가 보철물을 제작할 때, 환자에게 한 두 번의 병원 방문으로도 정확하고 정밀도 높은 보철물의 제공이 가능하게 할 수 있다. 본 논문은 현재 국내의 CAD/CAM 시스템 현황 및 인식을 파악함으로써 새로 장비를 도입할 때 고려해야 할 항목에 대한 조언을 제공하고자 한다. 대상 및 방법: 본 설문 조사는 서울대학교 치과 병원을 포함한 전국 298 명의 치과의사, 치과위생사 및 치과기공사를 대상으로 2016년 11월부터 12월까지 2 개월간 우편을 통해 실시하였다. 결과: 치과용 CAD/CAM 밀링기 구매 시 가장 고려하는 요인은 밀링기의 성능(64.43%)이었으며 용도는 치과보철물 제작과 임플란트용 맞춤형 지대주 제작이 49.33%로 가장 높았다. 또한, 응답자의 약 60% 이상이 CAD/CAM 밀링기가 만족할 만한 성능으로 개선된다면 새로운 장비의 구매에 대해 긍정적인 답변을 보였다. 결론: 설문조사 분석결과, 성능이 개선된 CAD/CAM 밀링기 디지털화 및 4차 산업혁명을 대비하는 치과산업에서 중요한 역할을 할 것으로 여겨진다.

• The Journal of Advanced Prosthodontics
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• 제9권4호
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• pp.265-270
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• 2017

PURPOSE. This study is to evaluate the internal fit of the crown manufactured by CAD/CAM milling method and 3D printing method. MATERIALS AND METHODS. The master model was fabricated with stainless steel by using CNC machine and the work model was created from the vinyl-polysiloxane impression. After scanning the working model, the design software is used to design the crown. The saved STL file is used on the CAD/CAM milling method and two types of 3D printing method to produce 10 interim crowns per group. Internal discrepancy measurement uses the silicon replica method and the measured data are analyzed with One-way ANOVA to verify the statistic significance. RESULTS. The discrepancy means (standard deviation) of the 3 groups are $171.6\;(97.4){\mu}m$ for the crown manufactured by the milling system and 149.1 (65.9) and $91.1\;(36.4){\mu}m$, respectively, for the crowns manufactured with the two types of 3D printing system. There was a statistically significant difference and the 3D printing system group showed more outstanding value than the milling system group. CONCLUSION. The marginal and internal fit of the interim restoration has more outstanding 3D printing method than the CAD/CAM milling method. Therefore, the 3D printing method is considered as applicable for not only the interim restoration production, but also in the dental prosthesis production with a higher level of completion.

• 한국안전학회지
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• 제8권4호
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• pp.54-60
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• 1993

The purpose of this study is to develop a CAD/CAM system for automatic creation and manufacturing of three dimension objects. The computer system used in this study made RAM 2M, CPU 80386, VGA graphic card. The results in this paper are as follows ; 1. By interconnect PC(personal computer) and NC(numerical control) milling machine with RS232C connector, we was constructed with CAD/CAM system. 2. The developed algorithm in this study is able to be design of three dimension object on the computer CRT and manufacturing of NC milling machine. 3. Because of design and modifying on the PC of objects, we can be saving time, cost and improvable precision of objects. 4. Essentially, we expect industrial accident to reduse according as we takes advantage of CAD/CAM system.

• 한국산학기술학회논문지
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• 제6권6호
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• pp.555-559
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• 2005

본 연구는 로터리 압축기의 사이드 블록 제작에 CAD/CAM을 활용한 것이다. 캠 시스템은 CAD(Solidworks), CAM(I-MASTER) 소프트웨어 및 CNC 밀링으로 이루어져 있다. 캠 소프트웨어는 컴퓨터 수치 제어 프로그래밍을 위한 G-코드 작성에 쓰인다.

• 대한치과기공학회지
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• 제37권1호
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• pp.9-15
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• 2015

Purpose: The purpose of this study was to compare the accuracy of the maxillary three-unit fixed dental prosthesis (FDPs) made using two CAD/CAM milling machines : DCM Group(Dentaim CAD/CAM milling machine), WCM Group(Wieland CAD/CAM milling machine). Methods: Each of 10 duplicate models was scanned by blue light scanner(Identica, Medit, Korea), and the three-unit FDPs (STL file) was designed using DelcamCAD. A total of 20 three-unit FDPs was fabricated, comprising 2 groups of 10 specimens each (shrinkage ratio is 1:1). The first three-unit FDPs STL file was used as a CAD reference model (CRM). Obtained STL files by scanning the inner surface of three-unit FDPs were convened into the point clouds-ASC II files. Discrepancies between the point clouds and CRM were measured by superimposition software. Statistical methods to analyze the data were used non-parametric method. The mean (SD) values were compared by a Mann-Whitney U-test. Type one error rate was set at 0.05. Results: WCM group had small discrepancies with $2.17{\mu}m$ of mean value compared to $4.44{\mu}m$ in DCM group. The accuracy values between the two groups showed a sratistically significant difference (Table 2, p<.05). Conclusion: The accuracy of the three-unit fixed dental prosthesis(FDPs) made of two CAD/CAM milling machines were statistically different. Accuracy with which the prosthesis made of WCM group was superior.

• The Journal of Advanced Prosthodontics
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• 제10권3호
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• pp.245-251
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• 2018

PURPOSE. To evaluate the accuracy of a model made using the computer-aided design/computer-aided manufacture (CAD/CAM) milling method and 3D printing method and to confirm its applicability as a work model for dental prosthesis production. MATERIALS AND METHODS. First, a natural tooth model (ANA-4, Frasaco, Germany) was scanned using an oral scanner. The obtained scan data were then used as a CAD reference model (CRM), to produce a total of 10 models each, either using the milling method or the 3D printing method. The 20 models were then scanned using a desktop scanner and the CAD test model was formed. The accuracy of the two groups was compared using dedicated software to calculate the root mean square (RMS) value after superimposing CRM and CAD test model (CTM). RESULTS. The RMS value ($152{\pm}52{\mu}m$) of the model manufactured by the milling method was significantly higher than the RMS value ($52{\pm}9{\mu}m$) of the model produced by the 3D printing method. CONCLUSION. The accuracy of the 3D printing method is superior to that of the milling method, but at present, both methods are limited in their application as a work model for prosthesis manufacture.

• 한국산학기술학회논문지
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• 제18권10호
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• pp.448-453
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• 2017

본 연구는 CAD/CAM 시스템을 활용하여 제작방식 및 재료에 따른 Coping crown의 변연 적합도를 비교하여 최적의 제작방식 및 재료를 비교하고자 하였다. 제작방식 및 재료에 따른 코핑 크라운을 제작하였고, 리플리카 테크닉을 사용하여 변연적합도 측정을 실시하였다. 제작법과 재료에 따른 비교분석을 위해 이원배치분산 분석을 실시하였으며 서로 다른 평균값들의 비교 분석을 위해서 일원배치분산분석을 실시하였다. 연구결과 합금을 Milling법으로 제작한 MM군은 114.6, MS군은 111.4 값을 나타냈고, Milling/Sintering 법으로 제작한 MSC군은 67.2, MSS군은 50.9값을 나타냈고, Printing 법으로 제작한 SLME군은 100.5, SLMR군은 113.2값을 나타냈고, 세라믹의 Milling/Sintering 법으로 제작한 MSZ군은 35.6, MSC군은 36.3값을 나타냈고, 제작방식과 재료에 따른 이원배치분산분석 결과는 제작방식에에 따른 유의한 차이는 보이지 않았으나, 재료에 따른 유의한 차이는 나타내었다. 가장 높은 변연적합도를 보인 군은 세라믹 재료의 Milling/sintering 법이 가장 낮은 값을 보이며 최적의 방법으로 검증이 되었다. 그러나 CAD/CAM 시스템을 활용하여 제작된 Coping crown의 변연 적합도는 임상에서 허용이 가능한 수치값에 해당하므로 임상에 적용이 가능한 것으로 나타났다.

• 농업과학연구
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• 제22권1호
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• pp.11-23
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• 1995

The CAD/CAM system for the manufacturing automation is the newest technology in mechanical engineering area and becomes the important research subject nowadays. Most of all hardwares and softwares for the CAD/CAM system used in the our manufacturing companies such as automobile company are developed by the foreign country and the purchasing price of them is very expensive but their applicability to a certain area is very limited. This study was conducted to develope a CAD/CAM system for the design and the automatic manufacturing of the iron pattern shaped with 3 - dimensional free curved surface, and to test its applicability to the design and the manufacturing of the rotary blade. The results obtained from the study are as follow; 1. The CAD system which can process graphic procedures from the free curved surface shaped data was developed with personal computer. 2. The CAM main program was developed. This main program could produce CL data from CAD data file by checking the tool interference according to the cutting mode. 3. The sub. program which can simulate the tool trace from the CL data was developed. 4. The post processor for the Deckel FP2NC NC milling machine from CL data file was developed and the sub program could transmit NC program through modem to NC milling machine was developed. 5. The developed CAM system seemed to be applicable to any other system. Because the measuring results of the cross sectional thickness of the plastic model from the manufacturing iron pattern by the system showed that this system could properly check the tool interference. 6. In took 75~90 hours to manufacture two iron patterns of rotary blade. For the sake of convenience in applying to the other systems, this system was developed in BASIC and FORTRAN computer language and minimum portion of machine language as possible.

• 한국산학기술학회논문지
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• 제7권4호
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• pp.550-553
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• 2006

본 논문에서는 다이 플레이트(Die Plate)를 제작할 때 생산성 향상을 위해서 3D CAD/CAM 시스템을 적용하였다. 사용된 3D CAD/CAM 소프트웨어는 UG NX 3.0이며 생성된 NC 코드는 CNC밀링 및 와이어 컷 방전가공기에 전송되어 다이 플레이트를 자동 가공한다.

• Journal of Biosystems Engineering
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• 제16권3호
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• pp.228-238
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• 1991

Cam plays very important roles due to continuous requirement for the high-speed and automation of the machinery. A large number of studies of cam curve were carried out by many researchers, and CNC milling and machining center for manufacturing cam have been widely used recently. The purpose of this study was to develop a CAD/CAM system for cam using QuickBasic language in 16-bit PC for application of cam design and manufacturing. Results obtained were as follows : 1. It was possible to input data by entering cam angle and its corresponding R, from 0 to 360 deg. of cam angle. The tediousness at entering data was minimized because of the same data format for both cylindrical cam and disc cam, and free format used for data file. 2. It was possible to design cam by choosing only the number of cam curve because of developing the CAD/CAM program with dimensionless method of cam curves including widely used 19 kinds. After selecting the number of the cam curve, the CAD/CAM system automatically shows the characteristics of cam motion enough to help a designer to decide : displacement, velocity, acceleration and jerk. 3. It was possible to execute, in an efficient way, both the cam profile synthesis and the generation of NC program for CNC machining center by using the input data. 4. This NC program generated by the CAD/CAM system developed here, was evaluated as positive in relation with actual manufacturing experiments and thought to be useful in its application without any modification. It can be said that this CAD/CAM system could be used by the beginners to design and manufacture the cam automatically as the system consists of very simple dialogue methods. In addition, self-developed QuickBasic would be would used as a basic tool for further stuides in this area of research, together with application.