자가-결찰 브라켓 시스템에 대한 고찰

이언화,김지현,안소연,홍성옥 대한통합치과학회 2013 대한통합치과학회지 Vol.2 No.2

Self-ligating brackets do not require an elastic or wire ligature, but have an inbuilt mechanism that can be opened and closed to secure the archwire. In the overwhelming majority of designs, this mechanism is a metal face to the bracket slot that is opened and closed with an instrument or fingertip. About 13 new self-ligating brackets are commercially available until now. Self-ligating brackets offer the very valuable combination of extremely low friction and secure full bracket engagement and user-friendly. The core advantages of self-ligating systems offer the possibility of a significant reduction in average treatment times and maybe also in anchorage requirements, particularly in cases requiring large teeth movements. While further refinements about better treatment effectiveness, self-ligating system appear able to deliver measurable benefit with good robustness and ease of use. This article aims to outline the history and development of self-ligating brackets and put the current situation -the generic advantages and problems claimed for these brackets- in context. In addition we will discuss some typical self-ligating brackets, the Damon and SPEED bracket, shortly.

금리자유화에 대한 은행의 대응전략

이언화 부산수산대학교 1993 (最高經營管理者課程)論文集 Vol.1993 No.10

지역 예술인 ② - 한국춤꾼 이언화

이언화(토론자) 현대미학사 1998 공연과 리뷰 Vol.18 No.-

도시재생사업 환경평가를 위한 예비 평가기준 항목 수립연구

이언화(Lee Eon-Hwa),이은희(Lee Eun-Hee),이규인(Lee Kyu-In) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(계획계)

Recently, the existing housing reconstruction redevelopment of urban regeneration projects rather than a new residential development projects around the city are growing. But sustainability of the city is having a negative impact because system to evaluate environmental aspects of these projects is nonexistent. In this paper, to assess environmental sustainability of urban regeneration projects based on Index of environmental assessment, we are going to establish Preliminary standard index. And Quantitative environmental assessment standard is needed for practical assessment. To prepare quantitative evidence of environmental assessment standard, we going to establish final 28 index by comparing with Items of Green Building Certification Criteria and final review.

교정용 미니스크류를 이용한 연속호선과 분절호선의 유한요소분석

이언화(Eon-Hwa Lee),유형석(Hyung-Seog Yu),이기준(Kee-Joon Lee),송진욱(Jin Wook Song),박영철(Young-Chel Park) 대한치과교정학회 2011 대한치과교정학회지 Vol.41 No.4

설측의 연속호선과 분절호선의 3차원 유한요소 모델에서 레버암의 길이와 미니스크류의 위치를 달리하여 전치부 후방 견인 시의 변위 양상을 비교하였다. 구개 경사면 견인 시, 두 호선 공히 레버암이 짧을수록 전치부의 설측 경사 이동을, 20 mm인 경우 중절치의 치체 이동 및 견치의 치근 이동 양상을 나타냈다. 정중구개봉합부 견인 시의 변위 양상은 구개 경사면의 경우와 유사하였으나, 레버암이 20 mm인 두 호선에서 절치의 치체 이동 및 연속호선에서 전치부의 함입 소견을 보였다. 호선 종류에 관계없이 레버암이 길어질수록 절치의 정출은 감소하였고, 구개 경사면에서의 견인인 경우와 함께 견치의 협측 변위가 증가하였으며, 분절호선에서 변위량이 많았다. 연속호선상의 제2소구치는 근심 경사 이동 및 함입 소견을, 대구치는 레버암이 길수록 원심 이동 및 협측 변위를 나타낸 반면, 분절호선상의 구치부도 3차원적 이동 양상을 나타냈으나 변위량은 미미하였다. 전치부 후방 견인 시 레버암 작용에 의해 절치의 경사 이동과 견치의 측방 이동 경향이 있었으며, 치체 이동을 위해서는 약 20 mm의 레버암을 추천할 수 있다. 또한 호선의 종류가 치열 변위 양상 및 변위량에 차이를 나타냈다. Objective: The purpose of this study was to compare the displacement patterns shown by finite element analysis when the maxillary anterior segment was retracted from different orthodontic miniscrew positions and different lengths of lever arms in lingual continuous and segmented arch techniques. Methods: A three dimensional model was produced, the translation of teeth in both models was measured and individual displacement was calculated. Results: When traction was carried out from miniscrews in the palatal slope, lingual tipping of crowns and extrusion of the maxillary anterior segment were found in both continuous and segmented arches as the lever arms were made shorter. With miniscrews in the midpalatal suture area, the displacement patterns were similar to the palatal slope, but bodily movement of the upper incisors was observed in both continuous and segmented arches with the lever arm at 20 mm. When lever arms were longer, there was less extrusion of the incisors and more buccal displacement of the canines. Such displacement was shown less in the continuous arch than the segmented arch. The second premolar showed crown mesial tipping and intrusion, and the molars showed distal tipping in the continuous arch. The posterior segment was displaced three dimensionally in the segmented arch, but the amount of displacement was less than the continuous arch. Conclusions: It is recommended that lever arms of 20 mm in length be used for bodily movement of the anterior segment. Use of continuous or segmented arches affect the displacement patterns and induce differences in the amount of displacement.

다수의 치아매복 치료시 고려사항

탁명현,이언화,조진형 대한치과교정학회 2012 대한치과교정학회 임상저널 Vol.2 No.6

가토의 항-사구체기저막 항체에 의한 사구체신염에서 기질단백 mRNA의 연속적 변화에 관한 연구

박문향,이언화,한인섭,전노원,노정우 대한병리학회 1998 Journal of Pathology and Translational Medicine Vol.32 No.9

편측 구치부 교차교합을 동반한 과발산형 골격성 II급 성인의 비수술 치험례

김명수,이동렬,이언화 대한치과교정학회 2020 대한치과교정학회 임상저널 Vol.10 No.1

This case report is about a 23-year-old female with hyperdivergent skeletal Class II malocclusion and right posterior scissor bite. Orthodontic mini-implants and transpalatal arch were used to correct the scissor bite, and extraction of four premolars were done for non-surgical treatment. By applying constant torque to the stiff stainless-steel wire on retraction of the upper anterior teeth, the inclination of them was restored. Good occlusion and esthetic profile were obtained by total arch intrusion mechanics of the upper dentition to correct the hyperdivergent pattern and gummy smile.

Caries Management by Risk Assessment (CAMBRA): 패러다임의 전환

안소연,홍성옥,이언화,김은희 대한통합치과학회 2013 대한통합치과학회지 Vol.2 No.2

Dental caries is a bacterially based disease that progresses when acid is produced by bacterial action. Pathological factors, including multiple species of acidogenic bacteria, salivary dysfuncion, and dietary carbohydrates are related to caries progression. Protective factors, which include antibacterials, salivary calcium, phosphate and proteins, salivary flow, and fluoride in saliva can balance, prevent or reverse dental caries. This article will introduce caries management by risk assessment (CAMBRA). It will summarize the scientific evidence behind the “caries imbalance” concept, which is the key to CAMBRA in clinical practice, Caries Risk Assessment (CRA) and Caries management protocols. CRA contains three domains : clinical findings, risk/biological factors and protective factors, and caries management protocols are applied by the caries risk level. Implementation of caries management by risk assessment into daily dental practice is a reality, with improvements yet to come.

IHNV (Infectious Hematopoietic Necrosis Virus): 과거, 현재, 그리고 미래

박정우,조미영,이언화,최혜승 한국수산과학회 2021 한국수산과학회지 Vol.54 No.5

A global increase in fish consumption has led to a rapid expansion of aquaculture production, which has been linked to enhancing the spread of infectious diseases. Viral diseases can cause high mortality in many cultured fish species, posing a serious threat to the aquaculture industry. Infectious hematopoietic necrosis virus (IHNV) is one of the primary threats to aquacultured salmonid species, causing huge economic losses. Since the first report in cultured sockeye salmon Oncorhynchus nerka during the 1950s in North America, IHNV has spread to other regions, including Europe, Asia, South America, and Africa by transportation of infected fish and eggs, causing disease and increasing mortality in a wide variety of salmonid species. Here, we review existing information relevant to IHNV: its phylogenetic characteristics, origin, infection history, virulence determinants, susceptible hosts, vectors, and vaccine development. This review also addresses a possible cross-species transmission of IHNV to a new host, olive flounder Paralichthys olivaceus, a cultured fish of economic importance in East Asian countries.