• 대한소아치과학회지
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• 제29권1호
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• pp.125-131
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• 2002

본 증례는 경희대학교 치과대학병원 소아치과학교실에 상악 중절치의 치수노출을 동반한 외상을 주소로 내원한 아동의 치험례이다. 증례 1은 미성숙 치근을 가지는 만 8세의 남아로 치아의 치수 노출에 따른 수산화칼슘 치수절단술을 이용한 치근단 형성술을 시행한 후 치아 재부착술을 시행한 증례이며, 증례 2는 점상의 치수노출을 보이는 미성숙 영구 중절치를 직접 치수 복조 추 석회화 층을 형성하는 기간동안 레진을 이용하여 유지한 후 치아 재부착술을 시행하였고 증례 3은 치은 연하로 치경부 파절을 보이는 만 12세의 환아로 신경치료 후 골 삭제술과 골 성형술을 동반한 판막술을 시행하여 carbon fiber post를 이용한 치아 재부착술을 시행한 증례이다 이상의 증례를 통하여 치아 재부착술을 성공적으로 시행하였으며 심미적으로 양호한 결과를 얻었기에 보고하는 바이다.

• 대한소아치과학회지
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• 제45권4호
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• pp.521-527
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• 2018

치아의 외상에서 파절편의 재부착은 본래 치아의 형태, 질감, 색, 방사선투과성을 재현하여 우수한 심미성을 제공한다. 9세의 남자 환자가 상악 우측 중절치의 복잡 치관-치근 파절로 내원하였다. 심한 치관 손상과 골 연하로 연장된 파절로 인해 예후가 불량했지만 환자의 나이를 고려하여 치아 파절편을 재부착하기로 결정하였다. Mineral trioxide aggregate(MTA)를 이용한 일회 내원 치근관형성술 후에 골절제술과 포스트 식립을 동반하여 치아 파절편을 재부착하였다. 정기적인 관찰결과 임상 및 방사선학적으로 양호한 결과를 나타냈기에 보고하고자 한다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2021년도 학술발표회
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• pp.60-60
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• 2021

Investigating Backward-Facing Step(BFS) flow is important in that it is a representative case for separation flows in various engineering flow systems. There have been a wide range of experimental, theoretical, and numerical studies to investigate the flow characteristics over BFS, such as flow separation, reattachment length and recirculation zone. However, most of such previous studies were concentrated only on the perpendicular step angle. In this study, several numerical investigations on the flow pattern over BFS with various step angles (10° ~ 90°) and expansion ratios (1.48, 2 and 3.27) under different Reynolds numbers (5000 ~ 64000) were carried out, mainly focused on the reattachment length. The numerical simulations were performed using an open source 3D CFD software, OpenFOAM, in which the velocity profiles and turbulence intensities are calculated by RANS (Reynolds Averaged Navier-Stokes equation) and 3D LES (Large Eddy Simulation) turbulence models. Overall, it shows a good agreement between simulations and the experimental data by Ruck and Makiola (1993). In comparison with the results obtained from RANS and 3D LES, it was shown that 3D LES model can capture much better and more details on the velocity profiles, turbulence intensities, and reattachment length behind the step for relatively low Reynolds number(Re < 11000) cases. However, the simulation results by both of RANS and 3D LES showed very good agreement with the experimental data for the high Reynolds number cases(Re > 11000). For Re > 11000, the reattachment length is no longer dependent on the Reynolds number, and it tends to be nearly constant for the step angles larger than 30°.) Based on the calibrated and validated numerical simulations, several additional numerical simulations were also conducted with higher Reynolds number and another expansion ratio which were not considered in the experiments by Ruck and Makiola (1993).

• Korean Journal of Hydrosciences
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• 제6권
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• pp.67-79
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• 1995

The reattachment of buoyant efflluent to a shore in a crossflow is investigated experimentally. The effluent is prodeced by discharging heated water through a projected side channel into a confined crossflow of the same depth. In the projecting effluent, the size of recirculating region, which is formed by deflected thermal plume on the lee of the effluent, tends to increase, but the maximum temperature decreases in the direction of the crossflow and it has more uniform transverse spreading compared to non-projected type. The heat flux across the crossflow is found to be independent of the projceted length of the side channel under relatively high buoyancy flux on the contrary to low buoyancy flux. The reattachment of th effluent can be specified by both velocity ratio and densimetric Froude number, whereas only the velocity ratio is governing factor to the reattachment of the effluent in the case of non-projecting type.

• 산업기술연구
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• 제19권
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• pp.59-65
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• 1999

This study is to analyze turbulent flow over a backward-facing step in a rectangular duct. The side wall effects on the internal flow were determined by varying the aspect ratio(defined as the step span-to-height ratio) from 1 to 20. In the flow behind a backward-facing step, separation, recirculation and redeveloping is occurred frequently. These phenomena appear in a particular variation by varying the aspect ratio. The results show that the aspect ratio has an influence on the velocity and reattachment length. When the AR is increased, the reattachment length is increased. For 6 over aspect ration, the rate of increase is decreased. The length of recirculation in the upper corner is increased, as the increase of aspect ration. It's width is not changed in the variation of aspect ration. The transverse, streamwise and spanwise velocities were decreased along the flow down stream of the step.

• Restorative Dentistry and Endodontics
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• 제39권4호
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• pp.324-328
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• 2014

Although fiber-reinforced posts have been widely used, they sometimes fail to obtain sufficient retention because of an extremely large canal space. To address this, several techniques have been introduced including relining of the fiber-reinforced posts. Here, we used a relined glass-fiber post to increase retention and fitness to the root canal in a crown reattachment case. The relining procedure was performed by using an indirect method on the working cast. This case also highlights the esthetic concerns regarding dehydration of the attached crown fragment.

• 대한치과보존학회:학술대회논문집
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• 대한치과보존학회 2004년도 춘계 학술대회 (제121회) 초록집
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• pp.304-308
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• 2004

Maxillary anterior crown fractures are a common form of injury that mainly affects children and adolescents. The position of maxillary incisors and their eruptive pattern carries a significant risk for trauma. In the pre-adhesive era, fractured teeth needed to be restored either with pin-retained inlays or cast restorations that sacrificed healthy tooth structure and were a challenge for dentists to match with adjacent teeth. But. recently the development of adhesive dentistry has allowed dentists to use the patient's own fragment to restore the fractured tooth. The purpose of this paper is to present 2 cases of reattachment of fractured teeth which had different fracture mode, and to evaluate prognosis of cases.

• 대한족부족관절학회지
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• 제10권1호
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• pp.11-17
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• 2006

Purpose: To evaluate the clinical results of resection of os subfibulare and lateral ligament reattachment or modified Brostrom procedure in patients with symptomatic os subfibulare. Materials and Methods: This is a retrospective study on fourteen patients (14 ankles) who have symptoms associated with os subfibulare. Between August 1999 and July 2004, they underwent 4 resection of os subfibulare and lateral ligament reattachment for ankle pain due to os subfibulare or 10 resection of os subfibulare and modified Brostrom procedure available for ankle instability due to os subfibulare. Follow-up period is averaged for 17.6 months (12-24 months). Clinical results were graded according to the AOFAS clinical rating system. Results: Clinical results were rated as good in 4 ankles after resection of os subfibulare and lateral ligament reattachment, excellent in 5, good in 4, and fair in 1 ankle after the resection of os subfibulare and modified Brostrom procedure. In the last follow up period, 1 case of anterolateral ankle instability, 1 case of ankle pain and 1 case of inversion limitation were present postoperatively, but all symptoms were improved progressively. Conclusion: Resection of os subfibulare and modified Brostrom procedure is a good surgical technique for chronic ankle instability due to os subfibulare. But if just the ankle pain is present, resection of os subfibulare and lateral ligament reattachment is a sufficient procedure.

• 대한기계학회논문집
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• 제13권4호
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• pp.780-788
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• 1989

본 연구에서는 재부착 이후의 재발달 난류경계층에서의 난류구조와 비평형 상태에서 평형상태로의 변화 과정을 실험적으로 고찰하고자 한다.

• 구강회복응용과학지
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• 제35권2호
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• pp.105-112
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• 2019

치관 파절은 영구치, 특히 치열에서 가장 노출된 위치에 존재하는 상악 전치에 가장 많이 발생하는 외상성 손상이다. 파절편 조각이 존재하고 상태가 양호한 경우 치관 파절을 치료하는 방법 중 하나는 원래 위치에 다시 파절편을 재부착하는 것이다. 이번 연구에서는 상악 전치에 발생한 치관 파절 증례를 파절편 재부착 술식으로 치료하였으며 심미적, 기능적으로 만족할만한 결과를 얻었기에 이를 보고하는 바이다.