• 대한치과기공학회지
• /
• 제42권1호
• /
• pp.45-53
• /
• 2020

Purpose: The purpose of this study was to investigate the current status and satisfaction of dental CAD/CAM system. Methods: A survey of dental technicians was conducted and a total of 353 responses were used for analysis. The satisfaction difference according to career was analyzed by ANOVA and tukey HSD (α = .05). Results: Satisfaction with the design program was 3.64 ± .86, the highest among all items. On the other hand, the satisfaction with price was 2.75 ± 1.02, which was the lowest. The difference according to career was statistically significant in the following items. Frequent breakdown, single crown margin, bridge crown margin, retentivity, price, A/S, equipment training (p<.05). Conclusion: As the materials applied to dental CAD/CAM are expanding and the types of prostheses are diversified, the use rate of CAD/CAM is continuously increasing. The dental CAD/CAM system will need to be improved in a way that will satisfy all patients, dentists and dental technicians.

• 대한치과의사협회지
• /
• 제52권6호
• /
• pp.332-345
• /
• 2014

In recent years, precision machining of the dental prosthesis by computer assisted system is becoming pervasive in clinical dentistry. Prosthesis fabricating system that is designed by computer software and made by computer devices is called as a CAD/CAM (Computer-Aided Design/Computer-Aided Manufacturing) system. By the use of dental CAD/CAM system, the improvement of marginal compatibility and mechanical properties in prosthesis can be obtained more effectively, an aesthetic quality by using new materials such as zirconia can be increased. Also, the restoration process can be simple and efficient, the production time can be shortened, the process of manufacture can be standardized, and the mass production is possible. What is clear is that these benefits are theoretically possible, but the dentist or dental technician must understand the CAD/CAM basic principles and limitations for obtaining the maximum advantages of CAD/CAM system. For this reason, this article will be presented about the basic principles of CAD/CAM system and the factors of error that might occur in the CAD/CAM process based on my empirical study.

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

• 대한치과보철학회지
• /
• 제55권4호
• /
• pp.436-443
• /
• 2017

과거의 computer-aided design/computer-aided manufacturing (CAD/CAM) 기술 형태는 사용자가 한 제조사의 구성요소만 사용해야 하는 폐쇄적인 시스템이었다면, 현재는 여러 제조사의 구성요소 중 사용자가 필요에 맞는 구성요소를 선택해서 사용할 수 있는 유연성을 가진 개방적인 시스템 형태로 변화하였다. 치과재료와 보철물 제작 기술의 발전에도 불구하고 의치 제작은 지난 100년 가까이 전통적인 제작방식을 따랐다. 하지만 최근 들어 기존 의치 제작의 단점을 보완하고자 CAD/CAM 제작 의치에 관한 연구가 활발히 이루어지고 있으며, 밀링이나 3D 프린팅을 이용해 상용화된 형태의 CAD/CAM 제작 의치가 이미 임상에서 쓰이고 있다. 본 증례는 3D face scan을 활용한 CAD/CAM 의치 제작의 가능성을 확인하고, CAD/CAM과 전통적인 방법으로 제작한 의치를 비교한 결과에 대해 보고하고자 한다.

• 구강회복응용과학지
• /
• 제32권2호
• /
• pp.141-148
• /
• 2016

Computer-aided technology는 최근 치과 치료의 흐름이다. DENTCA$^{TM}$ CAD/CAM denture (DENTCA Inc.)는 상용화된 computer-aided design/computer-aided manufacturing (CAD/CAM) 의치 시스템 중 하나로, 한 번의 내원을 통해 의치 제작에 필요한 환자의 모든 정보를 획득하여, 이 정보를 컴퓨터에 저장하고 3D 프린팅을 통해 두 번째 내원 시에 의치 장착을 목표로 한다. 현재까지 여러 증례들은 총의치 제작에 대한 CAD/CAM system의 임상적 적용을 시험해 보았다. 본 증례는 두 명의 환자에서 DENTCA system을 이용한 의치와 전통적인 방법을 이용한 의치를 동시에 제작하여 DENTCA system의 효용성과 한계점을 고찰하였다.

• 대한치과기공학회지
• /
• 제33권2호
• /
• pp.137-145
• /
• 2011

Purpose: To evaluate the accuracy of zirconia copings in terms of clinical verified for the clinical application of CAD/CAM. Methods: Zirconia copings (n=5) were prepared using CAD/CAM system and were sintered using the relevant electrical induction furnace, which uses a 2h sintering program with a maximum temperature of $1500^{\circ}C$. The copings placed at the models and the interval values were measured. Results: The meas interval values between the die and the zirconia copings were $44.14{\mu}m$(A), $44.57{\mu}m$(B), $44.72{\mu}m$(C). 51.05 ${\mu}m$(D). Conclusion: The maximum interval values between the die and the zirconia copings were $51.3{\mu}m$ which is acceptable for clinical use. ${\mu}m$ Proper understanding of the test conditions will help enhancing the accuracy of zirconia coping.

• 한국치위생학회지
• /
• 제14권5호
• /
• pp.617-622
• /
• 2014

With the explosive increase of esthetic demands by patients, many dental materials for the esthetic restoration have been introduced. Recently, zirconia based restorations are using for the cases of single crown, bridges, implant prostheses etc. Zirconia have superior mechanical properties and biocompatibility. Owing to the properties of high strength, zirconia has to be manufactured by CAD/CAM system. Dental CAD/CAM system is a futuristic treatment and technical system which makes it possible to produce the precision and uniform prosthesis and also standardize the treatments. This article introduces the characteristics of zirconia, fabrication procedure using CAD/CAM system and procedure for the cementation of zirconia based restoration.

• 대한치과기공학회지
• /
• 제37권1호
• /
• pp.9-15
• /
• 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.

• 대한치과기공학회지
• /
• 제36권3호
• /
• pp.159-164
• /
• 2014

Purpose: The purpose of this study was analysis of quality of fixed prostheses fabricated by dental CAD/CAM system. Methods: The ten same cases of stone models were manufactured by dental scannable model, and stone models were scanned using the dental scanner for changing digital model. Ten digital models were completed. The design of zirconia core for zirconia based all-ceramic crown was conducted by the dental CAD program. The samples were fabricated using the pre-sintered zirconia block by dental milling machine. Marginal gaps were analyzed using by silicone replica technique at the eight parts for quality analysis of samples. One-way ANOVA was used for statistical analysis(${\alpha}=0.05$). Results: The mean for marginal gaps were $93.2{\sim}99.1{\mu}m$ at the eight parts. One-was ANOVA didn't show significant differences(p=0.089). Conclusion: The fixed dental prostheses fabricated by dental CAD/CAM were within clinically acceptable range.

• 대한치과의사협회지
• /
• 제50권3호
• /
• pp.118-125
• /
• 2012

CAD/CAM systems (computer-aided design / computer-aided manufacturing) used for decades in restorative dentistry have its application to implant dentistry. This study aimed to overview CAD/CAM systems used implant dentistry, especially emphasizing custom implant abutments manufacturing. CAD/CAM custom abutments present the advantages of being specific to each patient and providing a better fit than the stock and cast custom abutments. This cutting edge technology of virtual-designed and computer-milled implant abutments will likely replace traditional implant restorative protocols and become the standard for implant dentistry in the foreseeable future.