• 대한심미치과학회지
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• 제27권2호
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• pp.66-74
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• 2018

2급와동의 복합레진수복은 강한 컨택과 적절한 외형 형성이 쉽지 않은 치료술식이다. 이를 극복하기 위해 고안된 매트릭스 시스템들이 있으나, 이에 대해 익숙하지 않은 술자들은 여전히 어려움을 겪곤한다. 이에 쉽고 효율적으로 성공적인 결과를 얻을 수 있는 테크닉을 필요하다. 본 케이스 리포트에서는 2급 와동의 복합레진수복술식을 과정별로 설명하고, 쉽고 간단히 만족할 만한 결과를 얻을 수 있는 원칙들과 임상팁들을 설명하였다.

• Communications for Statistical Applications and Methods
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• 제29권1호
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• pp.27-40
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• 2022

In this paper, the focus on the removal noise in the binary image based on the variational Bayesian method with the Ising model. The observation and the latent variable are the degraded image and the original image, respectively. The posterior distribution is built using the Markov random field and the Ising model. Estimating the posterior distribution is the same as reconstructing a degraded image. MCMC and variational Bayesian inference are two methods for estimating the posterior distribution. However, for the sake of computing efficiency, we adapt the variational technique. When the image is restored, the iterative method is used to solve the recursive problem. Since there are three model parameters in this paper, restoration is implemented using the VECM algorithm to find appropriate parameters in the current state. Finally, the restoration results are shown which have maximum peak signal-to-noise ratio (PSNR) and evidence lower bound (ELBO).

• 대한심미치과학회지
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• 제1권1호
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• pp.45-49
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• 1992

• Archives of Plastic Surgery
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• 제46권6호
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• pp.544-549
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• 2019

Background As the indications for postmastectomy radiotherapy expand, innovative solutions are required to reduce operative complications and reconstructive failure after prosthetic breast reconstruction. In this study, we investigated the effectiveness of acellular dermal matrix (ADM) inlay grafts in preventing postoperative wound dehiscence of irradiated breasts in the context of prosthetic breast reconstruction. Methods A retrospective analysis was conducted of 45 patients who received two-stage prosthetic reconstruction and radiotherapy following mastectomy. An ADM graft was placed beneath the incisional site during the second-stage operation in 19 patients using marionette sutures, whereas the control group did not receive the ADM reinforcement. Patient demographics and complications such as wound dehiscence, capsular contracture, peri-prosthetic infection, cellulitis, and seroma were compared between the two groups. Results During an average follow-up period of 37.1 months, wound dehiscence occurred significantly less often in the ADM-reinforced closure group (0%) than in the non-ADM group (23.1%) (P=0.032). There was no significant difference between the two groups in relation to other complications, such as capsular contracture, postoperative infection, or seroma. Conclusions The ADM inlay graft is a simple and easily reproducible technique for preventing incisional dehiscence in the setting of radiotherapy after prosthetic breast reconstruction. The ADM graft serves as a buttress to offload tension during healing and provides a mechanical barrier against pathogens. Application of this technique may serve to reduce complications in prosthetic breast reconstruction after radiotherapy.

• Journal of Forest and Environmental Science
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• 제29권1호
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• pp.49-57
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• 2013

Malaysia possesses about 1.56 million ha of Peat Swamp Forest (PSF). The PSF safeguard enormous biological diversity, while providing crucial benefits for the sustainable development of human communities. Numbers of threatened plant species are associated with the PSF, including the commercially important Gonystylus bancanus timber. To prevent significant losses of biodiversity, it is important to manage the PSF for both biological conservation and sustainable use. Equally important is to restore all degraded PSF in an attempt to ensure the PSF ecosystem is suitable for the vegetation to grow and rehabilitate back to the normal condition. Prior to plan any forest restoration program, there is a need to properly map the degraded PSF in order to estimate the forest conditions and determine the vegetations status. Most of the time this need to be done at a landscape level and requires a technology that can provide accurate, timely and reliable information for the planner to make decision. This paper describes a study using geospatial technology in combination with ground survey to classify the degraded PSF in South East Pahang Peat Swamp Forest (SEPPSF), Malaysia, into different degree of vegetation classes. With map accuracy of about 83%, the technique proved to be useful in delineating the different degree of PSF degradation from which the information can be used to properly plan forest restoration program in the area. The final output which is in the form of map can be used in developing a Restoration Master Plan for the degraded PSF areas.

• 한국측량학회지
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• 제29권5호
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• pp.471-478
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• 2011

고해상도 위성영상융합은 다중분광영상의 공간해상도를 향상시키기 위한 영상처리과정으로서 원격탐사 영상분석에서 그 중요성이 날로 커지고 있다. 고해상도 위성영상의 융합과정은 크게 다중분광영상의 크기 조절을 위한 업샘플링 과정과 흑백영상을 이용한 고주파 정보 주입과정으로 나눌 수 있다. 하지만 다중분광영상의 공간해상도를 강제적으로 키우는 업샘플링 과정에서 영상열화 현상이 수반되고 이는 이후 융합과정에서 분광정보를 왜곡시키는 하나의 원인이 된다. 이러한 문제를 해결하기 위해 본 연구에서는 최적화 기법에 근간을 둔 영상복원기법들을 위성영상 융합과정에 도입하여 이들의 효용성과 활용가능성을 평가하고자 하였다. 영상복원 기법들이 미치는 영향을 평가하기 위해 기존에 위성영상융합에 많이 사용된 공삼차 보간법을 이용한 방법과의 시각적/정량적 비교평가를 수행하였다. 정량적 비교평가 방법으로는 동일한 조건하에서 생성된 융합영상에 대한 분광왜곡 측정치를 이용하였다.

• 대한치과보철학회지
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• 제52권2호
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• pp.121-127
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• 2014

광범위한 보철 수복 치료는 수복 부위별로 다양한 고려 요소를 필요로 한다. 특히, 상악 전치부의 교합 계획은 다른 부위보다 더 많은 지식과 기술을 요한다. 전방 유도(anterior guidance)를 결정하는 상악 전치부 설면 외형을 제대로 형성하지 못하면, 기능적인 불편감과 함께 전체 치열의 불안정성을 야기한다. 임시 수복물 장착한 상태에서 적절한 조정을 통해 조화로운 전방 유도를 얻었다면 임시 수복물의 설면 형태를 최종 보철물로 정확하게 구현하는 방법에 주의를 기울여야 한다. 본 증례에서는 CAD/CAM (computer-aided design / computer-aided manufacturing) 시스템의 복제 기법을 활용하여 지대치의 디지털 이미지와 임시수복물의 디지털 이미지를 중첩시켜 보다 간편하게 보철물 형태를 복제하였다. 기존의 방법에 비해 술자는 진료실 시간을 줄일 수 있고, 환자는 기능과 심미 모두 만족할 만한 결과를 얻어 이를 보고하고자 한다.

• Archives of Plastic Surgery
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• 제45권1호
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• pp.37-44
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• 2018

Background Oncoplastic surgery is being increasingly performed in Korean women; however, unlike Westerners, Korean women usually have small to moderate-sized breasts. To achieve better outcomes in reconstructed breasts, several factors should be considered to determine the optimal surgical method. Methods A total of 108 patients who underwent oncoplastic surgery from January 2013 to December 2016 were retrospectively investigated. We used various methods, including glandular tissue reshaping, latissimus dorsi (LD) flap transposition, and reduction oncoplasty, to restore the breast volume and symmetry. Results The mean weight of the tumor specimens was 40.46 g, and the ratio of the tumor specimen weight to breast volume was 0.12 g/mL in the patients who underwent glandular tissue reshaping (n=59). The corresponding values were 101.47 g and 0.14 g/mL, respectively, in the patients who underwent reduction oncoplasty (n=17), and 82.54 g and 0.20 g/mL, respectively, in those treated with an LD flap (n=32). Glandular tissue reshaping was mostly performed in the upper outer quadrant, and LD flap transposition was mostly performed in the lower inner quadrant. No major complications were noted. Most patients were satisfied with the aesthetic results. Conclusions We report satisfactory outcomes of oncoplastic surgical procedures in Korean patients. The results regarding specimen weight and the tumor-to-breast ratio of Asian patients will be a helpful reference point for determining the most appropriate oncoplastic surgical technique.

• 대한치과보철학회지
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• 제51권1호
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• pp.47-51
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• 2013

골유착성 임플란트의 등장으로 결손치의 수복이 가능하게 되어 전통적인 고정성 또는 가철성 국소의치가 임플란트로 대체되어가고 있는 추세이다. 특히 젊은 환자의 경우 보철물의 수명과 함께 심미적인 결과를 고려해야 한다. 임플란트는 장기간의 성공적인 치료 결과와 함께 기능적인 회복을 이룰 수 있으나, 치은 퇴축으로 인한 변연부 노출, 치간 유두 상실로 인한 비심미적인 연조직, 금속 지대주, 상부 도재관의 투명도 감소 등은 임플란트 수복 시 정상적인 저작 기능 회복은 이룰 수 있으나 심미적으로는 불리한 결과를 보일 수 있다. 최근 CAD/CAM technology를 이용한 지르코니아는 충분한 강도와 파절 저항성을 가져 정상적인 저작 기능이 가능하고, 뛰어난 굴곡강도로 고정성 보철물, 가철성 의치 보철물에 다양하게 응용되며, 생체 적합성이 뛰어나고, 색조 재현성에서도 금속에 비해 심미적인 결과를 보이며 전치부와 구치부의 보철 치료에 이용되고 있다. 그리고 pressed ceramic technique을 이용한 전부 도재 보철 수복은 기존의 전통적인 도재 축성 과정보다 우수한 파절 저항성을 보인다. Pressed ceramic technique 은 상부의 도재 축성 과정이 왁스업을 통해 용융, 주조 되어 최종 보철물의 형태를 왁스업 단계에서 조절할 수 있는 장점이 있다. 임플란트를 포함한 본 증례의 보철 수복은 임시 보철물의 치경부 형태를 조절하여 심미적인 연조직을 재현하고자 하였고, 임시 보철물의 형태를 왁스업으로 복제하여 원하는 형태의 최종 보철물을 제작하였다. 본 증례에서는 임플란트 치료에 있어서 지르코니아와 pressed ceramic technique을 적용하여 기능적이고 심미적으로 양호한 결과를 얻었다.

• Restorative Dentistry and Endodontics
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• 제21권1호
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• pp.339-352
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• 1996

Many dentists have been taken an interest in restoration of severly damaged teeth after endodontic treatment and it is a true that there are lots of studies about it. In these days, although we have used Para-Post, pins, threaded steel post, cast gold post and core, and so on, as a method of restoration frequently, it has been in controversy with the effects of them on the teeth and surrounding periodontal tissue. In this study, we assume that the crown of the upper 1st premolar was severly damaged, and after the root canal therapy, two most common types of restoration were carried out ; 1) coronal-radicular amalgam restoration, 2) after setting up the Para-Post, restore with amalgam core and gold crown. After restoration, in order to present the concentration of stress at internal portion of the tooth and the surrounding periodontal tissue, we doveloped a 2-dimensional finite element model of labiopalatal section, then loaded forces from 2 long perpendicular to the lingual incline of buccal ridge an the middle point, parallel to the long direction axis of tooth at the fossa-were applied. The analyzed results were as follows : 1. Stress of the normal first premolar was concentrated on the most weakest anatomical structure, that is, cervical area, and no stress on the bifurcated area of the canal. 2. Crown restoration after root canal therapy causes large stress concentration on the bifurcated area of the canal. This stress concentration has larger value in case of lateral movement of mandible, and there are decrease in the stress concentration compared with natural tooth. 3. Coronal-radicular amalgam restoration method transports more stress to the tooth structure than restoration using Para-Post. 4. There are more stress concentration around Para-Post in the case of lateral movement, and we have more favo rable result when restored with Para-Post. 5. Generally, stress in the lateral movement is larger than stress in the perpendicular load.