• Journal of Chest Surgery
• /
• 제43권2호
• /
• pp.180-183
• /
• 2010

승모판하 좌심실류는 흑인들에서 주로 발생하는 드문 질환이다. 저자들은 심실성 빈맥을 동반한 승모판하 좌심실류의 수술 치험을 보고하고자 한다. 환자는 68세 남자로 수술은 통상적인 저체온 심폐 바이패스 하에서 진행하였다. 심첨부를 들어올리고 좌심실 후방 기저부에 위치한 심실류에 직접 종절개를 넣고 먼저 심실류의 목에 해당하는 부위의 심내막을 돌아가며 고주파절제술(radiofrequency ablation)을 시행한 다음 승모판 및 판막하 구조물을 피해 첨포를 이용한 심실내 심실류봉합술(endoaneurysmorrhaphy)을 시행하였다. 수술 후 경과는 양호하였으며 현재 술 후 2년 정도 경과한 상태로 부정맥의 재발이나 승모판 기능이상은 관찰되지 않고 있다.

• 생물환경조절학회지
• /
• 제15권2호
• /
• pp.190-195
• /
• 2006

허브 식물을 조경소재로 이용할 수 있도록 삽목방법, 토심 및 품종에 따라 뗏장형성에 미치는 영향을 알아 보고자 1cm, 3cm, 5cm의 토심별로 천삽, 와삽, 절와삽을 한 다음 애플민트, 페퍼민트, 스피어민트 등 세품종을 재료로초장과 마디수, 생체중, 뗏장의 품질을 조사한 결과 세 품종 중 애플민트는 신초의 수는 적으나 엽장, 엽폭이 크기 때문에 피복률이 좋고 생장속도도 빨라서 빠른 시기에 뗏장(sod)형성이 가능하였다. 스피어민트는 초장이 작고 발육속도가 느리기 때문에 뗏장의 이동성, 저장성면에서 양호하였다. 삽목 방법은 천삽에서 생육이 가장 좋았으나 뗏장 품질은 가장 낮았으며 절와삽은 초장이 작고 신초수가 많아 고품질의 뗏장을 생산할 수 있었다. 토심별로 본 생육의 차이는 5cm의 상토에서 재배한 것이 가장 높게 나타났고 뗏장의 품질과 이동성은 1cm의 상토에서 밀착되어 있어 근권부의 뗏장형성이 좋은 것으로 나타났다.

• The Journal of Advanced Prosthodontics
• /
• 제5권2호
• /
• pp.126-132
• /
• 2013

PURPOSE. Post surface conditioning is necessary to expose the glass fibers to enable bonding between fiber post and resin cement. The purpose of the present study was to evaluate the effect of different surface conditioning on tensile bond strength (TBS) of a glass fiber reinforced post to resin cement. MATERIALS AND METHODS. In this in vitro study, 40 extracted single canal central incisors were endodontically treated and post spaces were prepared. The teeth were divided into four groups according to the methods of post surface treatment (n=10): 1) Silanization after etching with 20% $H_2O_2$, 2) Silanization after airborne-particle abrasion, 3) Silanization, and 4) No conditioning (Control). Adhesive resin cement (Panavia F 2.0) was used for cementation of the fiber posts to the root canal dentin. Three slices of 3 mm thick were obtained from each root. A universal testing machine was used with a cross-head speed of 1 mm/minute for performing the push-out tests. Two-way ANOVA and Tukey post hoc tests were used for analyzing data (${\alpha}$=0.05). RESULTS. It is revealed that different surface treatments and root dentin regions had significant effects on TBS, but the interaction between surface treatments and root canal regions had no significant effect on TBS. There was significant difference among $H_2O_2$ + Silane Group and other three groups. CONCLUSION. There were significant differences among the mean TBS values of different surface treatments. Application of hydrogen peroxide before silanization increased the bond strength between resin cements and fiber posts. The mean TBS mean values was significantly greater in the coronal region of root canal than the middle and apical thirds.

• 대한소아치과학회지
• /
• 제31권4호
• /
• pp.729-733
• /
• 2004

완전 탈구된 치아의 치료 목적은 치주인대 세포의 손상과 치수 조직의 감염에 의한 염증 반응을 예방하거나 최소화하는 것이다. 치주인대 세포의 생활력은 완전 탈구된 치아의 예후에 있어 중요한 요소인데 치주인대 세포가 생활력을 유지하는 경우 재식시 재부착을 하게 되어 최소한의 염증반응 후 신생 백악질로 회복되지만, 생활력을 상실하게 되면 심한 염증반응을 야기하게 되어 광범위한 치근 흡수와 유착이 나타나게 된다. 치근이 유착되면 특히 성장하는 어린이일 경우 치조돌기의 성장을 방해하여 저위교합을 유발하게 된다. 또한 광범위한 치근 흡수나 유착으로 인한 치아의 조기 상실은 치조골의 흡수와 인접치의 지속적인 이동을 야기하여 기능적, 심미적인 문제를 발생케 한다. 본 증례는 상악 우측 중절치의 완전 탈구 후 재식한 후 항생제 투여 및 장기간의 수산화 칼슘 적용을 통해 9년에 걸쳐 기능적, 심미적으로 양호한 결과를 얻었기에 이에 보고하는 바이다.

• Restorative Dentistry and Endodontics
• /
• 제40권2호
• /
• pp.113-122
• /
• 2015

Objectives: The aim of this paper was evaluating the ratios of electrical impedance measurements reported in previous studies through a correlation analysis in order to explicit it as the contributing factor to the accuracy of electronic apex locator (EAL). Materials and Methods: The literature regarding electrical property measurements of EALs was screened using Medline and Embase. All data acquired were plotted to identify correlations between impedance and log-scaled frequency. The accuracy of the impedance ratio method used to detect the apical constriction (APC) in most EALs was evaluated using linear ramp function fitting. Changes of impedance ratios for various frequencies were evaluated for a variety of file positions. Results: Among the ten papers selected in the search process, the first-order equations between log-scaled frequency and impedance were in the negative direction. When the model for the ratios was assumed to be a linear ramp function, the ratio values decreased if the file went deeper and the average ratio values of the left and right horizontal zones were significantly different in 8 out of 9 studies. The APC was located within the interval of linear relation between the left and right horizontal zones of the linear ramp model. Conclusions: Using the ratio method, the APC was located within a linear interval. Therefore, using the impedance ratio between electrical impedance measurements at different frequencies was a robust method for detection of the APC.

• Parasites, Hosts and Diseases
• /
• 제41권4호
• /
• pp.203-207
• /
• 2003

An ELISA was developed for the diagnosis of vivax malaria using multiple stage-specific recombinant antigens of Plasmodium vivax. The DNA from the whole blood of a malaria patient was used as template to amplify the coding regions for the antigenic domains of circumsporozoite protein (CSP-1), merozoite surface protein (MSP-1), apical merozoite antigen (AMA-1), serine repeat antigen (SERA), and exported antigen (EXP-1). Each amplified DNA fragment was inserted into pQE30 plasmid to induce the expression of His-tagged protein in Escherichia coli (M15 strain) by IPTG. His-tagged proteins were purified by Ni-NTA metal-affinity chromatography and used as antigens for ELISA with patient sera that were confirmed previously by blood smear examinations. When applied to patient sera, 122 (80.3%) out of 152 vivax malaria cases reacted to at least one antigen, while no reactions were observed with 128 uninfected serum samples. We applied this ELISA to the screening of 3,262 civilian residents in endemic regions near the DMZ, which resulted in 236 positively detected (7.2%) cases. This method can be applied to serological diagnosis and mass screening in endemic regions, or can be used as a safety test for transfusion blood in endemic areas.

• 원예과학기술지
• /
• 제19권1호
• /
• pp.34-38
• /
• 2001

사과 M.9 자근대목의 효과적인 기내 급속 대량 번식법을 구명하기 위하여 본 연구를 수행한 결과, 신초 증식에 적합한 배지는 $1.0mg{\cdot}L^{-1}$ BA, $0.1mg{\cdot}L^{-1}$ IAA, $30g{\cdot}L^{-1}$ sucrose, $8g{\cdot}L^{-1}$ agar가 첨가된 MS 배지이며, 치상방법은 신초 정단부를 제거한 후 수평치상하는 것이 효과적이었다. 발근에 적합한 배지는 $0.5mg{\cdot}L^{-1}$ IBA, $20g{\cdot}L^{-1}$ sucrose, $8g{\cdot}L^{-1}$ agar가 첨가된 1/2 MS 배지였다.

• Restorative Dentistry and Endodontics
• /
• 제46권4호
• /
• pp.49.1-49.8
• /
• 2021

Objectives: To evaluate the fracture incidence of Reciproc R25 instruments (VDW) used during non-surgical root canal retreatments performed by students in a postgraduate endodontic program. Materials and Methods: From the analysis of clinical record cards and periapical radiographs of root canal retreatments performed by postgraduate students using the Reciproc R25, a total of 1,016 teeth (2,544 root canals) were selected. The instruments were discarded after a single use. The general incidence of instrument fractures and its frequency was analyzed considering the group of teeth and the root thirds where the fractures occurred. Statistical analysis was performed using the χ² test (p < 0.01). Results: Seven instruments were separated during the procedures. The percentage of fracture in relation to the number of instrumented canals was 0.27% and 0.68% in relation to the number of instrumented teeth. Four fractures occurred in maxillary molars, 1 in a mandibular molar, 1 in a mandibular premolar and 1 in a maxillary incisor. A greater number of fractures was observed in molars when compared with the number of fractures observed in the other dental groups (p < 0.01). Considering all of the instrument fractures, 71.43% were located in the apical third and 28.57% in the middle third (p < 0.01). One instrument fragment was removed, one bypassed, while in 5 cases, the instrument fragment remained inside the root canal. Conclusions: The use of Reciproc R25 instruments in root canal retreatments carried out by postgraduate students was associated with a low incidence of fractures.

• Restorative Dentistry and Endodontics
• /
• 제47권3호
• /
• pp.34.1-34.12
• /
• 2022

Objectives: This study aimed to evaluate the success rate of endodontic treatments performed by undergraduate students and the factors associated with the outcome. Materials and Methods: A follow-up of 3 to 8 years after root canal filling was carried out in 91 patients. At the follow-up visits, medical and dental history questionnaires were applied along with clinical and radiographic examinations. Data collected in the clinical exam included: the presence of pain, swelling, sinus tract, mobility, tenderness to palpation and percussion, periodontal probing profile, and type/quality of coronal restoration. Postoperative and follow-up radiographs were digitalized and analyzed by 2 trained and calibrated examiners to assess periapical healing. The treatment outcome was based on strict clinical and radiographic criteria and classified as success (absence of any clinical and radiographic sign of apical periodontitis) or failure (other combination). Logistic regression was used to investigate the impact of clinical and radiographic variables on endodontic treatment outcomes at a 5% significance level. Results: The success rate of endodontic treatments was 60.7%. The only risk factor significantly associated with failure was the presence of a periapical lesion on the postoperative radiograph (odds ratio, 3.35; 95% confidence interval, 1.17-9.54). Conclusions: The success rate of endodontic treatments performed by undergraduate students was low and was jeopardized by the presence of a periapical lesion on the postoperative radiograph.

• Journal of Veterinary Science
• /
• 제24권5호
• /
• pp.49.1-49.15
• /
• 2023

Background: Hystricomorpha rodents display a similar placentation model to humans. The present study was carried out considering the scarcity of information concerning the placental development in agouti. Objective: Describe the microscopy of the placenta, subplacenta and yolk sac of agoutis in early pregnancy and report on the inversion of the yolk sac. Methods: Fifteen females between the 14^th-32^nd day of gestation were used following euthanasia. Gestational buttons were collected, fixed, processed, stained to optical microscopy or immunohistochemistry. Results: Chorioallantoic placenta (CP) ranged from conical to a half-sphere, as follows: from the 14^th to 17^th day, the CP displays an inverted "V" shape, predominantly formed by cytotrophoblasts; from 20 to 22 days, formed almost entirely by cytotrophoblasts; at 28 days, a half sphere, with distinct lobes and interlobular area, numerous maternal gaps delimited by syncytiotrophoblasts and trophoblast giant cells; at 32 days, globose and undergoing the maturation process. Subplacenta, located between decidua and CP, initially presents septa consisting of simple columnar epithelium and after 17 days, comprising stratified epithelium. Visceral yolk sac (VYS) is attached to two CP projections between 14 and 17 days, formed by a simple cubic epithelium and inverted. Between 20 and 22 days, the epithelium displays apical villous projections with cytoplasmic vacuoles and a vascularized mesoderm. After the 24^th day, the VYS near the placenta is pleated, very vascularized and villous, with decreased villi sizes further away from the placenta. Conclusion: The agouti CP displays similar characteristics to other hystricomorpha, including placenta lobulation, a subplacenta and an inverted vitelline placenta.