Embolization of pancreatic arteriovenous malformation: A case report

BACKGROUND Pancreatic arteriovenous malformation (AVM) is a rare disease with a number of different reported treatment methods, but there are as yet no established or definite treatments for the disease. CASE SUMMARY A 43-year-old man visited the hospital due to periumbilical pain. The patient underwent imaging study and laboratory testing for evaluation of cause. Pancreatic AVM associated with pancreatitis was suspected on computed tomography and magnetic resonance imaging. The patient was diagnosed with pancreatic AVM with pancreatitis on imaging study and angiography. Transcatheter arterial embolization with various embolic materials was performed. Follow-up computed tomography scan revealed progressive regression of AVM and improvement of pancreatitis. At two-year follow-up, the patient showed no recurrence of symptom or pancreatitis. CONCLUSION Transcatheter arterial embolization can be considered an effective treatment modality for selective cases of pancreatic AVM.ope

A better method of predicting face changes after cosmetic surgery: the partial least squares regression.

Accurate prediction of post-surgery face changes is an essential step in the treatment planning of cosmetic surgery. During cosmetic treatment in facial deformity patients, the face does not directly follow the surgical skeletal movements in the underlying bony structures. The algorithms of currently available commercial programs are all based upon the 1-to-1 correspondence ratio and/or the ordinary least squares methods, which is far from being accurate. Predicting face changes after surgery requires a number of variables to consider. Human face landmarks in face photos and x-rays have a 2-dimensional entity. A landmark (or variable) has 2 measurements in the x-axis and the y-axis. A certain degree of vertical repositioning surgery induces horizontal relocation also and vice versa. Furthermore, the face response at a specific face landmark is highly dependent on its adjacent response, and its neighboring points are also dependent on each other. Applying the PLS method would be a solution for prediction and interpretation of this highly correlated 2-dimensional situation. Therefore, the aim of the present study is to propose a better statistical method of predicting face changes after cosmetic surgery by applying the partial least squares regression. In addition, we will also discuss a method to report error analyses for 2-dimensional data. Previously published error reports of 2-dimensional data sets have inappropriately applied 1-dimensional approaches, such as differences in distance or angular measurements. Our visualization method can be applied to 2- dimensional data sets. This method shows errors in both the x-axis and the y-axis simultaneously, which can also identify any between-group differences.OAIID:oai:osos.snu.ac.kr:snu2014-01/104/0000030821/2SEQ:2PERF_CD:SNU2014-01EVAL_ITEM_CD:104USER_ID:0000030821ADJUST_YN:NEMP_ID:A076080DEPT_CD:861CITE_RATE:0FILENAME:2014년03월03일 abstract_pls2014_word_2pages.pdfDEPT_NM:치의학과CONFIRM:

A More Accurate Method of Predicting Soft Tissue Changes After Mandibular Setback Surgery

Purpose: To propose a more accurate method to predict the soft tissue changes after orthognathic surgery.Patients and Methods: The subjects included 69 patients who had undergone surgical correction of Class III mandibular prognathism by mandibular setback. Two multivariate methods of forming prediction equations were examined using 134 predictor and 36 soft tissue response variables: the ordinary least-squares (OLS) and the partial least-squares (PLS) methods. After fitting the equation, the bias and a mean absolute prediction error were calculated. To evaluate the predictive performance of the prediction equations, a 10-fold cross-validation method was used.Results: The multivariate PLS method showed significantly better predictive performance than the conventional OLS method. The bias pattern was more favorable and the absolute prediction accuracy was significantly better with the PLS method than with the OLS method.Conclusions: The multivariate PLS method was more satisfactory than the conventional OLS method in accurately predicting the soft tissue profile change after Class III mandibular setback surgery. (C) 2012 American Association of Oral and Maxillofacial Surgeons J Oral Maxillofac Surg 70:e553-e562, 2012This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (grants 2011-0026594 and 2011-0028067).OAIID:oai:osos.snu.ac.kr:snu2012-01/102/0000030821/7SEQ:7PERF_CD:SNU2012-01EVAL_ITEM_CD:102USER_ID:0000030821ADJUST_YN:YEMP_ID:A076080DEPT_CD:861CITE_RATE:1.64FILENAME:첨부된 내역이 없습니다.DEPT_NM:치의학과EMAIL:[email protected]_YN:YCONFIRM:

A better statistical method of predicting postsurgery soft tissue response in Class II patients

Objective: To propose a better statistical method of predicting postsurgery soft tissue response in Class II patients. Materials and Methods: The subjects comprise 80 patients who had undergone surgical correction of severe Class II malocclusions. Using 228 predictor and 64 soft tissue response variables, we applied two multivariate methods of forming prediction equations, the conventional ordinary least squares (OLS) method and the partial least squares (PLS) method. After fitting the equation, the bias and a mean absolute prediction error were calculated. To evaluate the predictive performance of the prediction equations, a leave-one-out cross-validation method was used. Results: The multivariate PLS method provided a significantly more accurate prediction than the conventional OLS method. Conclusion: The multivariate PLS method was more satisfactory than the OLS method in accurately predicting the soft tissue profile change after surgical correction of severe Class II malocclusions.OAIID:oai:osos.snu.ac.kr:snu2014-01/102/0000030821/2SEQ:2PERF_CD:SNU2014-01EVAL_ITEM_CD:102USER_ID:0000030821ADJUST_YN:YEMP_ID:A076080DEPT_CD:861CITE_RATE:1.184DEPT_NM:치의학과SCOPUS_YN:YCONFIRM:

Clinical use of alumina-toughened zirconia abutments for implant-supported restoration: prospective cohort study of survival analysis

Objectives The aim of this prospective cohort study was to compute the long-term clinical survival and complication rates of alumina-toughened zirconia abutments used for implant-supported restorations and to evaluate the effects of several clinical variables on these rates. Material and methods From May 1998 to September 2010, 213 patients aged 18years or older were recruited. The patients received 611 external hex implants and 328 implant-supported fixed restorations using alumina-toughened zirconia abutments. During the follow-up, each restoration was coded as a dental event, which included loosening or fracture of abutment screws, and abutment fracture. From the coded data, the effects of the investigated clinical variablesrestored area (anterior/posterior), number of prosthodontic units (one/two units or over), prosthesis type (single-unit/multiunit without pontic/multiunit with pontic), implant system, and patient genderon the survival of the abutments were evaluated. Survival analysis using KaplanMeier method and Cox proportional hazard model was applied. The 5-year survival and complication rates of the abutments were assessed. Results The number of prosthodontic units and the type of prosthesis had a significant association with complication rates (P<0.05). KaplanMeier survival analysis estimated that the cumulative 5-year complication rate of the abutments used in single restorations was 19.7%. Multiunit-fixed dental prostheses without and with pontics had complication rates of 3.9% and 3.8%, respectively. The 5-year survival rate of the abutments was more than 95%, regardless of the type of prosthesis. Conclusions Alumina-toughened zirconia abutments are likely to exhibit excellent long-term survival in clinical use for fixed restorations. Single tooth replacement with the abutment at the molar region may require special care and extra attention.OAIID:oai:osos.snu.ac.kr:snu2013-01/102/0000030821/3SEQ:3PERF_CD:SNU2013-01EVAL_ITEM_CD:102USER_ID:0000030821ADJUST_YN:YEMP_ID:A076080DEPT_CD:861CITE_RATE:2.514FILENAME:2013 05월 coir 24(5),2013,517-522.pdfDEPT_NM:치의학과EMAIL:[email protected]_YN:YCONFIRM:

Experimental study on the salivary pellicles formed on the surfaces of orthodontic materials 교정장치 표면에 형성되는 타액성 피막에 관한 연구

Thesis (doctoral)--서울대학교 대학원 :치의학과 치과교정학전공,1999.Docto

지역별 진료비 변이에 관한 연구

학위논문(석사)--서울대학교 보건대학원 :보건학과 보건학전공,2000.Maste

Smoothed Bagging with Kernel Bandwidth Selector

Maste

[시사초점] 국가기술자격제도 개편방향

1. 그 간의 국가기술자격제도 개편 내용 2. 행정규제개혁과 관련한 국가기술자격제도 개편내용 가. 국가기술자격취득자 보수교육 폐지 1) 현황 2) 제기되는 문제점 3) 개선방안 나. 국가기술자격 등록의무를 폐지하고 자격증 교부관리 1) 현황 2) 문제점 3) 개선방안 3. 앞으로의 자격개편 방향 : 사무관리분야 국가기술자격 확대 가. 추진배경 나. 사무관리분야 국가기술자격 확대방안(안

Effect of presurgical nasoalveolar molding (PNAM) appliance and cheiloplasty on alveolar molding of complete unilateral cleft lip and palate patients

본 연구의 목적은 술전 비치조 정형장치 (PNAM)와 구순열 수술이 치조골 정형에 미치는 효과를 평가하는 것이다. 연구 대상은 장기간 추적검사가 가능했던 16명의 완전 편측성 순구개열 환자 (남자 10명, 여자 5명, 평균 파열부 최단거리: 10.46mm) 이었으며 서울대학교 치과병원 교정과에서 동일 교정의에게서 술전 비치조 정형장치로 치료받은 후 동일 외과의 에 의해서 회전-전진법을 사용한 구순열 수술을 받았다. 평균 치조 정형기간은 13.10주였으며 구순열 수술 후 내원시까지 기간은 평균 8.31주였다. 초진시 (T0, 평균연령 : 일), 치조골 정형술 후(T1, 평균연령 : 일), 구순열 수술 후 (T2, 평균연령 : 일)에 환자들의 상악모형을 각각 채득하였고 1:1 비율로 사진을 찍은 후 컴퓨터 프로그램을 이용하여 7개의 선, 5개의 각도 계측항목을 측정하였고 paired t-test를 사용하여 통계학적 분석을 시행하였다. 1. 치조 분절의 후방부위는 치조골 정형술과 구순열 수술의 영향을 받지 않는 안정적인 구조였다. 2. 치조골 정형술에 의한 파열부 간격의 폐쇄는 주로 대분절 전체의 후방 굴곡으로 이루어졌다. 3. 치조골 정형술 기간 동안 대분절의 전방 성장이 억제되었으나 구순열 수술 후에는 전방성장이 회복되었다. 4. 구순열 수술 후 전방부 분절간 각도가 증가한 이유는 구순열 수술 이후 형성된 구순 반흔조직 의 압력 에 의하여 치조골 정형술 효과가 나타난 것이다. The goal of the present study was to evaluate the effects of PNAM appliance and cheiloplasty on alveolar molding. Samples consisted of 16 unilateral cleft lip and palate infants (10 males and 6 female, mean age=37.0 days after birth, average alveolar cleft gap=10.46m), who were treated with PNAM appliances by one orthodontist and rotation- advancement cheiloplasty by one surgeon in Seoul National University Hospital. Average duration of alveolar molding treatment was 13.10 weeks and these patients were recalled at average 8.31 weeks after cheiloplasty. These patients' models were obtained at initial visit (T0, mean age : days after birth), after successful alveolar molding (T1, mean age : days after birth), and after cheilopasty (T2, mean age : days after birth). Seven linear and five angular variables were measured using 1 : 1 photometry and soft ware program(V-ceph. Cybermed. Seoul, Korea). Paired t-test was performed to investigate statistical significance at p<0.05 level. 1 The posterior parts of alveolar segments were the stable structures during alveolar molding treatment period and after cheiloplasty in infants. 2. The closure of cleft gap during alveolar molding was usually due to backward bending of the whole part of the greater segment. 3. Although forward growth of the greater segment was hindered by alveolar molding, it resumed after cheiloplasty. 4. Increase of anterior inter-segment angle after cheiloplasty was due to the molding effect of the lip scar pressure