• International Journal of Oral Biology
• /
• 제46권4호
• /
• pp.200-207
• /
• 2021

In case of gingival recession and alveolar bone defects due to tooth loss for a long period of time in a single tooth in the maxillary anterior region, it is not easy to obtain aesthetic results with a single implant prosthesis. For aesthetic restoration, it is important to preserve hard and soft tissues through alveolar bone augmentation as well as restore harmony with adjacent teeth and soft tissues by placing the implant in an ideal location. In this case, an implant was placed using guided bone regeneration and a connective tissue graft simultaneously with immediate implantation after extraction from the maxillary anterior region where only residual root was left for a long period of time.

• 대한치과교정학회지
• /
• 제22권4호
• /
• pp.855-868
• /
• 1992

This study was designed to test the possibility of using a standardized lateral facial photographs as a clinical tool which produce the prediction of postsurgical soft-tissue profile changes associated with surgical correction in skeletal CIII patients. The number of the patients involved in this study were 27 in total, including 11 male patients and 16 female patients. A practical method to the utilization of presurgical photo prediction for mandibular prognathic patients has been presented. To predict postoperative facial appearance, montage photographs were superimposed on standard facial reference photos taken preoperatively. Within the limitations of its technology, postoperative predictions generated by this method were of sufficient accuracy, especially mandible and chin area, for clinical use. In addition, they provide valuable communication and diagnostic information which may be used in formulating treatment plan in cases requiring corrective orthognathic surgery. But, the lip changes were somewhat exaggerated by photo prediction. Consequently, the photo prediction seems suitable for planning profile changes in orthognathic surgery that include mobilization of one main mandibular fragment. Futher investigations are needed to determine whether changes of soft-tissues and hard-tissues are sufficiently reproducible so that more meaningful predictive values can be established.

• Journal of Microbiology and Biotechnology
• /
• 제31권1호
• /
• pp.70-78
• /
• 2021

Identifying the extracellular metabolites of microorganisms in fresh vegetables is industrially useful for assessing the quality of processed foods. Pectobacterium carotovorum subsp. carotovorum (PCC) is a plant pathogenic bacterium that causes soft rot disease in cabbages. This microbial species in plant tissues can emit specific volatile molecules with odors that are characteristic of the host cell tissues and PCC species. In this study, we used headspace solid-phase microextraction followed by gas chromatography coupled with mass spectrometry (HS-SPME-GC-MS) to identify volatile compounds (VCs) in PCC-inoculated cabbage at different storage temperatures. HS-SPME-GC-MS allowed for recognition of extracellular metabolites in PCC-infected cabbages by identifying specific volatile metabolic markers. We identified 4-ethyl-5-methylthiazole and 3-butenyl isothiocyanate as markers of fresh cabbages, whereas 2,3-butanediol and ethyl acetate were identified as markers of soft rot in PCC-infected cabbages. These analytical results demonstrate a suitable approach for establishing non-destructive plant pathogen-diagnosis techniques as alternatives to standard methods, within the framework of developing rapid and efficient analytical techniques for monitoring plant-borne bacterial pathogens. Moreover, our techniques could have promising applications in managing the freshness and quality control of cabbages.

• 대한물리치료과학회지
• /
• 제1권2호
• /
• pp.313-320
• /
• 1994

This article provids background information necessary to design orthopaedic physical therapy programs based on a patient's level of orthopaedic involvement during the acute, subacute, or chronic stage of soft-tissue healing. This approach was used whether the problem involved injury from trauma, insult from overuse, disease, surgical intervention. Soft-tissue lesions and clinical conditions were defined ; the stages of inflammation and repair were described with emphasis on how to manage soft tissues and joints with therapeutic exercise during each stage. A problem list with goals and plan of care was outlined to summarize each clinical situation. A list of clinical problems will be used as the foundation for designing exercise problems for each region of the body.

• 로봇학회논문지
• /
• 제19권1호
• /
• pp.39-44
• /
• 2024

This study introduces a novel method for predicting the shape of soft catheter robots embedded with electromagnets. As an advancement in the realm of soft robotics, these catheter robots are crafted from flexible and pliable materials, ensuring enhanced safety and adaptability during interactions with human tissues. Given the pivotal role of catheters in minimally invasive surgeries (MIS), our design stands out by facilitating active control over the orientation and intensity of the inbuilt electromagnets. This ensures precise targeting and manipulation of the catheter segments. The research encompasses a comprehensive breakdown of the magnetic modeling, tracking algorithms, experimental layout, and analytical techniques. Both simulation and experimental results validate the efficacy of our method, underscoring its potential to augment accuracy in MIS and revolutionize healthcare-oriented soft robotics.

• 대한골관절종양학회지
• /
• 제10권2호
• /
• pp.79-87
• /
• 2004

목적: 최근 자기공명영상의 개발로 다양한 연조직종양의 영상의학적 진단이 가능해 졌다. 그러나 연조직종양의 다양한 조직구성이나 시간에 따라 구성분의 변화는 자기공명영상 만으로 악성과 양성 종양조차 감별을 어렵게 한다. 이에 본 저자들은 임상과 자기공명영상의 복합적인 소견으로 악성과 양성 연조직종양을 감별해 보고자 하였다. 대상 및 방법: 병리조직학적으로 확진된 82례(중간성종양을 악성종양으로 포함하여 37례와 염증성 종괴를 양성종양으로 포함하여 45례)를 후향적으로, 임상적 소견으로 연령, 크기, 위치, 그리고 자기공명영상 소견으로 종양경계, T2신호강도양상, 조영제T1신호강도양상, 그리고 조영증강 범위를 연관시켜 분석하였다. 자기공명영상으로 진단이 어렵지 않는 많은 전형적인 지방종과 결절종 그리고 농양같은 낭종은 양성종양 분류에서 제외하였다. 결과: 악성연조직종양은 양성에 비하여 연령으로 21~40세와 61~80세, 크기로 3.0 cm 이상, 발생위치로 몸체-골반-하지, 그리고 자기공명영상에서 불규칙한 경계, 50%이상의 조영증강범위 소견들의 빈도가 높았다. 결론: 발생위치로 몸체-골반-하지 와 상지-어깨-척추 로 나눈 임상소견이 악성과 양성 연조직종양을 감별하는데 통계학적으로 유의성있는 차이를 보였으며 나머지 다른 소견들은 특이적이지는 않았지만 부가적으로 악성과 양성을 감별하는데 도움이 되는 소견이었다.

• 대한의용생체공학회:학술대회논문집
• /
• 대한의용생체공학회 1990년도 추계학술대회
• /
• pp.92-95
• /
• 1990

• 대한치과교정학회지
• /
• 제37권4호
• /
• pp.245-259
• /
• 2007

성장기 아동의 상악골 전방 견인을 이용한 치료 효과 중 하악골의 후하방 회전은 III급 골격관계를 개선시키지만 하안모의 길이가 길어져 face mask가 장안모 환자에게는 비적응증 이라는 것이 선학들의 일반적 견해였다. 그러나 실제로 하안모의 길이를 분류 기준으로 삼아 이에 따른 치료 효과를 비교한 연구는 부족한 실정이며 경조직 변화에 따른 연조직 변화의 연구 또한 미비하였다. 본 연구에서는 상악골 열성장을 보이는 성장기 골격성 III급 부정교합 환자 44명을 Ricketts의 lower facial height (LFH)기준에 따라 LFH가 정상 수치 이상인 군(1군)과 미만인 군(2군)으로 분류하여, 상악골 전방 견인 시 두 군간의 경조직, 연조직 치료 효과를 비교하고 경조직과 연조직의 상호 관계를 비교 분석하여 다음과 같은 결론을 얻었다. 상악의 경조직, 연조직 전방 이동량은 두 군간에 유의한 차이가 없었다. 하악의 경조직 후방이동량은 두 군간에 유의한 차이가 없었으나 연조직 후방이동량은 2군에서 더 크게 나타났다. 하안면의 경조직 수직 비율 변화는 두 군간에 유의한 차이가 없었으나 연조직 수직 비율 변화는 2군에서 더 크게 나타났다. 상악과 하악의 전후방적 경조직, 연조직 변화는 유의한 상관관계를 갖는 반면 수직적 하안면 비율 변화는 유의한 상관관계를 갖지 않았다. 위의 결과들을 고려해 볼 때 Face mask 사용 결과 상악골의 전방 이동과 하악골의 후하방회전이 일어났으며 하악의 연조직 후방 이동량은 단안모에서 더 크게 나타났다.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2007년도 춘계학술대회A
• /
• pp.372-377
• /
• 2007

For more than 2,500 years, surgical teaching has been based on the so called "see one, do one, teach one" paradigm, in which the surgical trainee learns by operating on patients under close supervision of peers and superiors. However, higher demands on the quality of patient care and rising malpractice costs have made it increasingly risky to train on patients. Minimally invasive surgery, in particular, has made it more difficult for an instructor to demonstrate the required manual skills. It has been recognized that, similar to flight simulators for pilots, virtual reality (VR) based surgical simulators promise a safer and more comprehensive way to train manual skills of medical personnel in general and surgeons in particular. One of the major challenges in the development of VR-based surgical trainers is the real-time and realistic simulation of interactions between surgical instruments and biological tissues. It involves multi-disciplinary research areas including soft tissue mechanical behavior, tool-tissue contact mechanics, computer haptics, computer graphics and robotics integrated into VR-based training systems. The research described in this paper addresses the problem of characterizing soft tissue properties for medical virtual environments. A system to measure in vivo mechanical properties of soft tissues was designed, and eleven sets of animal experiments were performed to measure in vivo and in vitro biomechanical properties of porcine intra-abdominal organs. Viscoelastic tissue parameters were then extracted by matching finite element model predictions with the empirical data. Finally, the tissue parameters were combined with geometric organ models segmented from the Visible Human Dataset and integrated into a minimally invasive surgical simulation system consisting of haptic interface devices and a graphic display.

• 대한치과교정학회지
• /
• 제44권6호
• /
• pp.281-293
• /
• 2014

Objective: Esthetic improvements during orthodontic treatment are achieved by changes in positions of the lips and surrounding soft tissues. Facial soft-tissue movement has already been two-dimensionally evaluated by cephalometry. In this study, we aimed to three-dimensionally assess positional changes of the adult upper lip according to simulated maxillary anterior tooth movements by white light scanning. Methods: We measured changes in three-dimensional coordinates of labial landmarks in relation to maxillary incisor movements of normal adults simulated with films of varying thickness by using a white light scanner. Results: With increasing protraction, the upper lip moved forward and significantly upward. Labial movement was limited by the surrounding soft tissues. The extent of movement above the vermilion border was slightly less than half that of the teeth, showing strong correlation. Most changes were concentrated in the depression above the upper vermilion border. Labial movement toward the nose was reduced significantly. Conclusions: After adequately controlling several variables and using white light scanning with high reproducibility and accuracy, the coefficient of determination showed moderate values (0.40-0.77) and significant changes could be determined. This method would be useful to predict soft-tissue positional changes according to tooth movements.