비색법(Chromometry)을 이용한 유리피판술 후의 피부색 변화 측정

임중재,손대구,최동원,한기환 大韓成形外科學會 2001 Archives of Plastic Surgery Vol.28 No.3

도재용착용 비귀금속 합금(Co-Cr)과 세라믹의 소성술식에 따른 전단결합강도 분석

임중재 대한치과기공학회 2017 대한치과기공학회지 Vol.39 No.3

Purpose: In this study, a corresponding porcelain coating material was applied to dental Co-Cr metal among PFM. Methods: The bonding strength of the fired specimens was measured by a three-point flexural rigidity test. SEM/EDS was used to observe the surface component of specimens. Results: First, All groups were higher than the minimum bonding strength of 25 MPa specified in ISO 9693 for dental metal-ceramics specimens. Second, The bonding strength of control group(WO) is 44.64 MPa. Experimental group DM was 35.45 MPa and DP was 31.82 MPa(P<0.05). Tukey's HSD tests results have shown that the bonding strength in control group(WO) is higher than that of experimental group(DM, DP). Third, In the case of metal - porcelain bonding strength, the application of opaque porcelain and firing were higher than those of the group treated with degassing process. Conclusion: The bonding strength was higher when the powder opaque porcelain was applied than the paste opaque porcelain.

스포츠 마우스가드의 기능성과 안정적인 착용감을 위한 제작 증례

임중재,Im, Joong-Jae 대한치과기공학회 2020 대한치과기공학회지 Vol.42 No.3

Here, we studied the sports mouse guard as an oral device system, to minimize the sports related facial and dental injuries, jawbone fracture and brain injury, and by layering the hardened sheets for improving the activity performance and stable wearing. By pressuring and layering 2 soft- and 1 hard-layers of ethylene vinyl acetate (EVA) thermoplastic materials, for a category of martial art, record sports and leports, here we introduce a methodology for thickness control of layers to protect the teeth and oral structure. A personally customized mouse guard optimized for sports by layering a mixture of soft and hardened sheets is not easily detached during the sporting activity, easy to breathe through, comforts to wear, and also improves the sporting record. A designed EVA thermoplastic material for individual sports is used as the mouth guard, which is stably attached, easily removed, and convenient for breathing through the mouth.

콘드로이틴 황산염을 결합한 I형 콜라겐지지체와 연골세포를 이용한 연골재생

임중재,손대구,손경희,양은경,한기환 대한성형외과학회 2007 Archives of Plastic Surgery Vol.34 No.4

Purpose: In this study, porous type I collagen scaffolds were cross-linked using dehydrothermal(DHT) treatment and/or 1-ethyl-3-(3-dimethyl aminopropyl) carbodiimide(EDC), in the presence and absence of chondroitin-6-sulfate(CS) and cultured autologous chondrocytes(Chondro) for cartilage regeneration. Methods: Cartilage defects were created in the proximal part of the ear of New Zealand rabbits. Four prepared types of scaffolds(n=4) were inserted. The groups included Chondro-Collagen-DHT(Group 1), Chondro- Collagen-DHT-EDC(Group 2), Chondro-CS-Collagen- DHT(Group 3), and Chondro-CS-Collagen-DHT-EDC (Group 4). Histomorphometric analysis and cartilage- specific gene expression of the reconstructed tissues were evaluated 4, 8, and 12 weeks after implantation . Results: EDC cross-linked groups 2 and 4 regenerated more cartilage than other groups. However, calcification was observed in the 4th week after implantation. CS did not increase chondrogenesis in all groups. Cartilage-specific type II collagen mRNA expression increased in the course of time in all groups.Conclusion: EDC cross-linking methods maintain the scaffold and promote extracellular matrix production of chondrocytes.

치조제가 심하게 흡수된 하악 무치악환자의 나사-시멘트 유지형 임플란트 보철 수복증례

임중재 대한치과기공학회 2019 대한치과기공학회지 Vol.41 No.2

Purpose: Prosthodontics for edentulous patients is a treatment technique using implant, which has impactful results in retention and support effects. Methods: As a retention technique, SCRP (screw and cement retained implant prosthesis) has reported in many studies as a beneficial method for both patients and curers, which can reduce errors in process of making abutment and top implant. Results: Prosthesis manufacturing, as polymerization method of hardened resin teeth with thermoplastic resin, is helpful for patients with aesthetic and financial situations regarding residual ridge and interocclusal relationship, also indicates reliable results in both retention and care. Conclusion: Using SCRP technique, we notably obtained a clinical and aesthetic outcome from five implants in anterior tooth, which are half fixable and detachable implants on screw of implant abutment by the technicians at anytime.

도재용착용 Non beryllium 합금의 degassing과 opaque의 소성술식에 따른 결합강도 분석

임중재(Im, Joong-Jae),이상혁(Lee, Sang-Hyeok) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.7

본 연구는 베릴륨 함유하지 않은 Ni-Cr계 도재용 금속에 전용도재를 도포, 소성된 시편을 3점 굴곡 시험으로 결합강도를 측정하고, SAM/EDS로 표면성분관찰 실험한 AVOVA와 Tukey HSAD 사후검정을 실시한 결과는 다음과 같 은 결론을 얻었다. 첫째. 모든 군에서 ISO 9693의 치과용 금속-도재 시편의 최소 결합강도의 최소치인 25 MPa의 전단결 합강도를 상위하며 안정적인 결과값을 나타냈다. 둘째. 결합 강도는 대조군 V1은 32.37±1.91 MPa으로 나타났고, 실험군 V2 38.25±1.38 MPa, 실험군 V3 46.43±2.14 MPa, 그리고 실험군 V4 47.21±1.72 MPa, 순으로 나타났으며 통계적으로 유 의한 차이를 보였다. 사후 검정 (Tukey’s HSD test) 결과, 결합강도 실험결과 실험군 V4는, 대조군 V1보다 높게 나타났다. 셋째. 금속-도재의 결합에서 산화처리를 시행한 군보다 시행하지 않고 불투명 도재를 도포하고 소성한 군이 높게 나타났 으며, paste불투명 도재보다 분말 불투명도재의 사용에 따른 결합강도가 더 높게 나타났다. 넷째. 실험군 V4는 금속과 도재의 결합강도 비교에서 가장 높게 나타났다. This study is to compare the differences of bonding strength based on the Degassing temperatures and various opaque materials for Ni-Cr alloy specimen which does not contain beryllium(Be). Numerous comparison tests have been performed to measure the bonding strength by experimenting 3-point flexural rigidity tests in order to find out ways of stabilization and enhancement of bonding strength between metal and porcelain. AVOVA, surface component observation experiment by SAM/EDS, and Tukey’s HSAD posteriori tests results are as follows: First, The bonding strength in all groups has exceeded the minimum (25MPa) of ISO9693 bonding strength regulation for dental mental-porcelain specimen. Second, The bonding strength of Group V1 was 32.37±1.91 MPa, 38.25±1.38 MPa in Group V2, 46.43±2.14 MPa in Group V3 and 47.21±1.72 MPa Group V4. The difference has been statistically meaningful. Tukey’s HSAD posteriori tests results have shown that the bonding strength in Group V4 was higher than that of Group V1. Third, the bonding strength between metal and porcelain without degassing process was higher than that of with degassing process, and the bonding strength of powder opaque was higher than that of paste opaque. Fourth, Group V4 has ranked the highest on the comparison table of metal and porcelain bonding strength.

공정능력지수 Cp에 대한 효율적인 가설검정

조중재,임수덕 한국품질경영학회 2006 품질경영학회지 Vol.34 No.3

IMT-2000 서비스의 수요예측

임수덕,조중재,황진수,조용환,Im, Su Deok,Jo, Jung Jae,Hwang, Jin Su,Jo, Yong Hwan 한국통신학회 1999 韓國通信學會論文誌 Vol.24 No.12

본 연구에서는 IMT-2000 서비스의 상용화 실시 시기를 전문가 의견을 바탕으로 하여 예측한 결과 2001년 2월경에 첫 서비스를 실시할 것으로 나타나 전문가들은 대체로 빠른 진척을 예상하고 있음을 알 수 있었다. 또한 본 연구의 가장 중요한 부분인 IMT-2000 서비스 가입 수요예측에서는 가격 경쟁력에 대한 두 가지 경우에 따라 다른 모형을 제시하였다. 본 연구에서는 신제품에 대한 수요예측에 정성적 방법인 전문가 의견법과 정량적 방법인 성장곡선 모형을 결합하여 과거자료가 없는 신제품의 수요예측의 오차를 줄이고자 하였다. 각 성장곡선 모형에 필요한 계수를 전문가들의 주관적인 의견을 근거로 하여 추정하였다. In this paper, we forecast launching time of the commercial IMT-2000 service as feb. 2001, according to expert’s opinion, and most of they forecast rapid evolution. And, we propose two different models according to two cases for competition power of price for IMT-2000 service subscriber demand forecasting. In this paper, we combine the expert’s opinion method with the growth curve model for demand forecasting for new products in order to reduce error of the demand forecasting that haven’t past references. The estimation of needed coefficients for each growth curve model is based on experts’ subjective opinions.

임플란트 환자의 보철물에 대한 인식 및 관리 실태에 관한 연구

이혜은,임중재,Lee, Hye-Eun,Im, Joong-Jae 대한치과기공학회 2019 대한치과기공학회지 Vol.41 No.4

Purpose: The purpose of this study is to provide basic data for the improvement of dental care service for patient care. Methods: The survey period was from December 10, 2018 to June 10, 2019. The subjects were 180 patients who were treated with dental implant in 20 dental hospitals and clinics in Daejeon and Gyeonggi province. A total of 145 questionnaires were analyzed except for 35 copies which were unreliable or difficult to analyze. Results: The most important care method for prolonging the life time of dental implant prosthesis was the highest rate of correct brushing (39.4%), and a majority in the subjects used oral hygiene products (91.0%). With regard to discomfort after dental implant prosthesis, food particles between the teeth showed the highest response (49.7%), and discomfort with gum infections and bleeding and reduced mastication increased significantly with age (p<0.05), whereas feeling of irritation decreased significantly with age (p<0.05). Conclusion: This study is meaningful in that it approached the perception and discomfort of prosthesis from the patients' point of view. It needs to establish the basic data to improve dental treatment service for patient care.

I형 콜라겐지지체의 다양한 가교처리 방법이 연골막성 연골재생에 미치는 영향

손대구,임중재,손경희,양은경 대한성형외과학회 2006 Archives of Plastic Surgery Vol.33 No.6

Purpose: Collagen is the principal structural biomolecule in cartilage extracellular matrix, which makes it a logical target for cartilage engineering. In this study, porous type I collagen scaffolds were cross-linked using dehydrothermal(DHT) treatment and/or 1-ethyl-3-(3-dimethyl aminopropyl) carbodiimide(EDC), in the presence and absence of chondroitin-6-sulfate(CS) for cartilage regeneration.Methods: Cartilage defects were created in the proximal part of the ear of New Zealand rabbits. Four types of scaffolds(n=4) were inserted. The types included DHT cross-linked(Group 1), DHT and EDC cross- linked(Group 2), CS added DHT cross-linked(Group 3), and CS added DHT and EDC cross-linked(Group 4). Histomorphometric analysis and cartilage-specific gene expression of the reconstructed tissues were evaluated respectively 4, 8, and 12 weeks after implantation.Results: The largest quantity of regenerated cartilage was found in DHT cross-linked groups 1 and 3 in the 8th week and then decreased in the 12th week, while calcification increased. Calcification was observed from the 8th week and the area increased in the 12th week. Group 4 was treated with EDC cross-linking and CS, and the matrix did not degrade in the 12th week. Cartilage-specific type II collagen mRNA expression increased with time in all groups.Conclusion: CS did not increase chondrogenesis in all groups. EDC cross-linking may prevent chondrocyte infiltration from the perichondrium into the collagen scaffold.