• 제목/요약/키워드: Prosthesis type

검색결과 252건 처리시간 0.027초

능동형 대퇴의지 시스템의 설계 및 최적화 연구 (Design and Optimization of Active Transfemoral Prosthesis System)

  • 정진호;이광희;이철희
    • 재활복지공학회논문지
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    • 제8권4호
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    • pp.283-289
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    • 2014
  • 본 논문에서는 능동형 대퇴의지 시스템의 설계 및 최적화에 대한 연구를 진행하였다. 본 연구의 능동형 대퇴의지 시스템은 무릎부의 1 자유도를 통해 슬관절의 움직임을 모사하는데, 실제 다리의 기능을 대체하는 것이므로 사람의 다리 무게와 최대한 유사해야 하며, 경량화가 중요한 요소라고 할 수 있다. 본 연구에서는 기존에 개발된 3-링크 구조의 능동형 의지 시스템의 문제점을 보완하기 위해 기어 구동 방식의 능동형 대퇴의지 시스템을 설계 및 제작하였고, 사용자의 만족감 향상 및 피로도 저감을 위해 최적화를 통한 경량화를 진행하고 유한요소해석을 통해 응력 및 변위 특성을 분석하고 안정성을 검증하였다. 또한 능동형 의지 시스템이 사용자의 보행 의도에 맞추어 작동하기 위해 의지의 인공 발에 스트레인 게이지를 부착하여 보행시 발의 앞, 뒷부분에 각기 다르게 가해지는 하중을 측정, 보행 주기를 판단할 수 있도록 한다. 이 때 스트레인 게이지는 미세한 변형에도 민감하게 반응하므로 유한요소해석을 통해 적절한 부착위치를 결정하고, 실제 제작 및 실험을 통해 안정성 및 보행주기 판단 여부를 검증한다.

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

  • 이태희;이하빈;김지환
    • 대한치과기공학회지
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    • 제41권3호
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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.

임플란트 단일 치아 수복 시 수직 침하와 인접치와의 위치 변화: 증례 보고 (Axial displacement in single-tooth implant restoration: Case report)

  • 정승회;김선재;장재승
    • 대한치과보철학회지
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    • 제59권1호
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    • pp.126-133
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    • 2021
  • 여러 연구에서 임플란트 지지 보철물의 수직 침하에 대해 보고되고 있지만, 구강내 임플란트 지지보철물의 기능 시 수직침하 양상에 대해서는 알려진 바 없다. 본 증례에서는 2명의 환자에서 구치부 단일 치아 임플란트 지지 보철물의 3차원적인 변화를 평가하였다. 내부연결형 임플란트를 식립하였으며 통상적인 방법으로 Screw-Cement Retained Prosthesis(SCRP) 형태의 보철물을 제작해 장착하였다. 구강스캐너(Cerec Omnicam, Dentsply Sirona, USA)를 이용해 보철물 장착 시, 장착 1주, 1개월, 1년 후 구강 스캔을 시행하였으며 디지털 분석 프로그램(Geomagic Control X, 3D systems, USA)을 이용해 기간에 따른 위치 변화를 3차원적으로 평가하였다. 인접 치아를 기준으로 보철물 장착 후 임상적인 위치 변화가 나타났으며 변화량은 시간이 지남에 따라 증가하였다.

An implant-supported removable partial denture on milled bars to compromise the inadequate treatment plan: a clinical report

  • Kim, Jee-Hwan;Lee, Jae-Hoon
    • The Journal of Advanced Prosthodontics
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    • 제2권2호
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    • pp.58-60
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    • 2010
  • Presurgical prosthetic treatment planning is critical for the success of the implant prosthesis. Inadequate treatment plan, due to insufficient discussion between prosthodontist, and surgeon, may result in poor prognosis. A 26-year-old male patient was referred for prosthodontic treatment after implant was placed in the area of teeth #17,16, 22, 25 and 27, without adequate discussion nor the treatment planning between oral surgeon and prosthodontist. It was found that the patient had two hopeless teeth, and a severely resorbed alveolar ridge. Additional tooth extraction was needed and the type of definitive prosthesis was shifted from fixed type to removable one. Proper pre-surgical treatment planning is essential for the good prognosis. Implant-supported removable prosthesis on milled bars may be a useful treatment option in patients with incorrect angled placement on severely resorbed alveolar ridge.

시멘트 비접착 인공 고관절의 주대 형상 최적 설계 (Optimal Design of Stem Shape for Artificial Hip Prosthesis with Unbonded Cement Mantle)

  • 최돈옥;윤용산
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 춘계학술대회논문집A
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    • pp.932-938
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    • 2001
  • This study is concerned with the shape optimization of stem for the artificial hip prosthesis with unbonded cement mantle. The artificial hip prosthesis with unbonded cement mantle allows a stem to slip on cement mantle because of polished stem surface. Unbonded cement mantle type has several advantages compared with bonded cement mantle type, for example, small micro motion, preventing stress shielding and so on. In this study, 2-dimensional axisymmetric model was developed with considering characteristics of unbonded cement mantle. Moreover, optimal shape of stem was obtained by using feasible direction method. The objective of this optimization is maximizing supported vertical loading. The slip motion and stresses of stem, cement mantle and bone is used for constraints. The optimal shape which obtained by this study has slope of 0.15 in proximal part and maintains the width about 5mm in distal part In addition, simplified 3-dimensional analysis which applying optimal shape is carried out. The result of 3-dimensional analysis showed that optimal shape has some advantages for cement mantle stress. However, more realistic 3-dimensional analysis which including bending effect, complex geometries etc. is needed in further research.

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Alloplastic total temporomandibular joint replacement using stock prosthesis: a one-year follow-up report of two cases

  • Lee, Sang-Hoon;Ryu, Da-Jung;Kim, Hye-Sun;Kim, Hyung-Gon;Huh, Jong-Ki
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • 제39권6호
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    • pp.297-303
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    • 2013
  • Alloplastic total replacement of the temporomandibular joint (TMJ) was developed in recent decades. In some conditions, previous studies suggested the rationale behind alloplastic TMJ replacement rather than reconstruction with autogenous grafts. Currently, three prosthetic products are available and approved by the US Food and Drug Administration. Among these products, customized prostheses are manufactured, via computer aided design/computer aided manufacturing (CAD/CAM) system for customized design; stock-type prostheses are provided in various sizes and shapes. In this report, two patients (a 50-year-old female who had undergone condylectomy for the treatment of osteochondroma extending to the cranial base on the left condyle, and a 21-year-old male diagnosed with left temporomandibular ankylosis) were treated using the alloplastic total replacement of TMJ using stock prosthesis. The follow-up results of a favorable one-year, short-term therapeutic outcome were obtained for the alloplastic total TMJ replacement using a stock-type prosthesis.

하악 무치악 환자에서 임플란트 하이브리드 보철물을 이용한 전악 수복 증례 (Full mouth rehabilitation of mandibular edentulous patient using implant hybrid prosthesis)

  • 김성빈;김성회;박영범;문홍석
    • 대한치과보철학회지
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    • 제51권3호
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    • pp.214-220
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    • 2013
  • 무치악 환자의 임플란트 보철 치료는 지지, 유지, 안정성, 발음 등의 측면에서 더 우수한 결과를 보인다. 임플란트를 이용한 무치악 환자의 치료는 다양하며, 크게 가철성과 고정성으로 나눌 수 있다. 가철성 치료에는 임플란트 유지 및 지지 피개의치가 있으며, 고정성 보철치료에는 ceramo-metal 보철물과 임플란트 하이브리드 보철물(implant hybrid prosthesis)이있다. 치료계획의 수립은 잔존 치조제, 연조직, 악간 관계, 환자의 경제적 상황 등을 종합적으로 고려하여 수립해야 한다. 임플란트를 이용한 하이브리드 보철물은 고정성 치료를 통해 환자에게 적절한 교합력을 제공하고 심리적인 안정감을 주는 동시에 적절한 연조직의 회복을 통한 심미적인 결과를 얻을 수 있다. 본 증례는 73세 여환으로 상악 Kennedy Class I 부분 무치악과 하악 무치악 상태로 내원하였다. 상악에는 우측 견치부터 좌측 제1소구치까지 7개의 잔존치를 이용한 가철성 국소의치, 하악은 양측 측절치와 제1소구치 부위에 4개의 임플란트 고정체를 이용한 하이브리드 보철물로 최종 치료 진행하였으며 치료 후 기능적, 심미적으로 만족스러운 결과를 얻었기에 이를 보고하고자 한다.

치과보철물의 평균수명에 관한 연구 (A Study on the Life Expectancy of the Dental Prosthetic Restorations)

  • Young-Ku Kim
    • Journal of Oral Medicine and Pain
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    • 제20권2호
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    • pp.317-325
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    • 1995
  • This study was performed to investigate the mean life expectancy of dental prosthetic restorations. The author has examined 352 dental prosthesis clinically and radiologically, and decided the success(survival) and failure(mortality) of the dental prosthesis. The dental prosthesis which had been treated in the Seoul National University Dental Hospital, two private clinics in Seoul, one university dental hospital, and two private clinics in local province were included in this study. The survival analysis using product limit estimator was used and the mean life expectancy of each type of dental prosthesis was calculated. The results were as follows : 1. The life expectancies were 10.5 years in gold crown and bridge, 8.5 years in porcelain fused to metal crown and bridge, 8.3 years in nonprecious metal crown and bridge, 8.1 years in removal partial denture, and 7.7 years in full denture. 2. The causes of mortality were in the order of dental caries(24.6%), fracture of dental prosthesis(19.2%), periodontal problems(18.6%), chronic chewing difficulty and dysfunction due to dental prosthesis(15.0%), excessive exposure of abutments due to the marginal defect of dental prosthesis(14.4%), abnormal occlusion due to severe attrition of artificial teeth in dentures(3.0%), periapical problems(2.4%), perforation of dental prosthesis(1.8%), and loose contacts with neighboring tooth(1.2%). 3. Among survival cases, 66.5% showed normal chewing ability and 31.9% showed partial chewing ability. However, 1.6% of them complained loss of chewing ability. 4. Among failure cases, 6.6% showed normal chewing ability and 38.9% showed partial chewing ability. However, 54.5% of them complained loss of chewing ability.

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건강보험 급여화 관련 임플란트보철물의 기공원가 분석 연구 (A study on the dental technology and fabrication cost analysis of implant prosthesis for National Health Insurance)

  • 조미향;이광영;이희경;남신은;류재경;권혁문;김경록;조홍규
    • 대한치과기공학회지
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    • 제42권2호
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    • pp.149-162
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    • 2020
  • Purpose: The purpose of this study was to conduct a cost accounting of implant prosthesis according to the fabrication activities. Methods: In this study, the cost price of implant prosthesis fabrication activities was calculated by the bottom-up costing approach for material and labor cost and the top-down costing approach for expenses and other. Results: The total cost price was estimated to 220,000 ~ 310,000 won per one implant prosthesis. By product, the screw type was estimated to 220,000 ~ 230,000 won, and when the stent and tray were included, it was 260,000 ~ 270,000 won, which increased about 40,000 won. And, the cement type with more material and labor time was estimated to 250,000 ~ 260,000 won, and when the stent and tray were included, it was about 300,000 won. Conclusion: In terms of the fabrication cost ratio by items, it was shown that material cost and labor cost accounted for about 40% and 30% of the total cost structure for resin case, respectively, which was the opposite for porcelain. It was shown that expenses and general administrative expenses accounted for about 15%, and profits were about 11% ~ 14% in both cases.

APPLICATION OF FINITE ELEMENT ANALYSIS TO EVALUATE PLATFORM SWITCHING

  • Kim Yang-Soo;Kim Chang-Whe;Jang Kyung-Soo;Lim Young-Jun
    • 대한치과보철학회지
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    • 제43권6호
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    • pp.727-735
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    • 2005
  • Statement of problem. Platform switching in implant prosthesis has been used for esthetic and biological purpose. But there are few reports for this concept. Purpose. The purpose of this study is evaluation of platform switching in wide implant by three dimensional finite element analysis. Materials and Methods. The single implant and prosthesis was modeled in accordance with the geometric designs for Osstem implant system. Three-dimensional finite element models were developed for (1) a wide diameter 3i type titanium implant 5 mm in diameter, 13 mm in length with wide cemented abutment, titanium alloy abutment screw, and prosthesis (2) a wide diameter 3i type titanium implant 5 mm in diameter, 13 mm in length with regular cemented abutment, titanium alloy abutment screw and prosthesis(platform switching) was made for finite element analysis. The abutment screws were subjected to a tightening torque of 30 Ncm. The amount of preload was hypothesized to 650N, and round and flat type prostheses were loaded to 200 N. Four loading offset point (0, 2, 4, 6 mm from the center of the implants) were evaluated. Models were processed by the software programs HyperMesh and ANSA. The PAM-CRASH 2G simulation software was used for analysis of stress. The PAM-VIEW and HyperView were used for post processing. Results. The results from experiment were as follows; 1. von Mises stress value is increased in order of bone, abutment, implant and abutment screw. 2. von Mises stress of abutment screw is lower when platform switching. 3. von Mises stress of implant is lower when platform switching until loading offset 4 mm. 4. von Mises stress of abutment is similar between each other. 5. von Mises stress of bone is slightly higher when platform switching. Conclusion. The von Mises stress pattern of implant components is favor when platform switch ing but slightly higher in bone stress distribution than use of wide abutment. The research about stress distribution is essential for investigation of the cortical bone loss.