• 대한치과보철학회지
• /
• 제52권1호
• /
• pp.27-33
• /
• 2014

연구 목적: 본 연구는 임플란트 보철물과 인접치 사이의 식편압입을 호소하는 환자를 대상으로 각종 임상 자료를 분석하여 식편압입의 임상적 발현 양상을 알아보고자 하였다. 연구 재료 및 방법: 식편압입을 주소로 내원한 보철물 장착이 완료된 임플란트 환자 51명을 대상으로 설문조사와 구강검사를 시행하고 방사선 사진과 모형을 채득하여 식편압입과 관련이 있는 요소를 분석한 결과 다음과 같은 결과를 얻었다. 결과: 1. 식편압입은 하악(39.2%)보다 상악(60.7%)에서 많이 나타났다. 2. 식편압입은 자연치아가 임플란트 보철물의 원심 부위(13.7%)에 있는 경우보다 근심 부위(86.2%)에 있는 경우에 많이 나타났다. 3. 식편압입이 나타난 임플란트 보철물과 그 인접치 사이의 접촉점은 긴밀하지 않은 경우(94.2%)가 대부분이었다. 결론: 임플란트 보철물과 인접치 사이에 식편압입이 일어나지 않기 위해서는 임플란트 보철물과 인접치아가 적절한 긴밀도를 가지고 있어야 하겠다.

• 대한치과보철학회지
• /
• 제35권2호
• /
• pp.296-307
• /
• 1997

The purpose of this study was to compare the fracture strength of the IPS-Empress ceramic crown according to margin types such as bevel, shoulder, rounded shoulder, shoulder with bevel, rounded shoulder with bevel and bevel with groove. After 10 metal dies were constructed for each group, the IPS-Empress ceramic crown were fabricated and each crown was cemented on each metal die with Bistite resin cement. The cemented crowns mounted in the testing jig were inclined 30 degree and universal testing machine (Zwick 1456 41, Zwick Co., Germany) was used to measure the fracture strength. The obtained results were as follows : 1. The fracture strength of the crown with rounded shoulder was the highest of all. The mean fracture strength was 484N in rounded shoulder, 357N in bevel, 341N in rounded shoulder with bevl, 300N in shoulder with bevel, 280N in shoulder and 275N in bevel with groove. 2. The fracture strength of rounded shoulder was statistically different from those of shoulder with bevel, shoulder and beve41 with groove. 3. In the strain at fracture, there was no significant difference among each group. 4. The fracture mode of the crown was similar and most of fracture line began at the loading area and extended through proximal surface perpendicularly to the margin, irrespective of margin type.

• 한국동물위생학회지
• /
• 제38권4호
• /
• pp.249-252
• /
• 2015

Primary renal tumors are uncommon in dogs with prevalence rate of approximately 1%. Renal carcinoma originating from epithelium of proximal convoluted tubules are more likely to be affected to Middle-aged dogs (average age, 8y), males about twice as often as bitches. A 10-year-old, female, German Shepherd dog with history of anorexia, vomitting and hematuria was referred to the Animal Disease Diagnostic Division in Animal and Plant Quarantine Agency. The dog was necropsied and several organs were collected, fixed in 10% phosphate-buffered formalin, embedded in paraffin wax and sectioned for histopathology. Grossly, the kidneys were bilaterally enlarged ($18{\times}12{\times}8cm$; left, $18{\times}10{\times}8cm$; right). The numerous cysts varying sizes from 3 to 6 cm in diameter were protruding from the surface of both kidney. A large nodule ($10{\times}6{\times}6cm$) was discovered between cardiac and diaphragmatic lobe in the right lung. Immunohistochemical examination revealed strong positive reaction to cytokeratin and ki-67 in the nuclei of the epithelial tumor cells. But showed negative reactions to vimentin and CD10. Based on the pathological and immunohistochemical examination, we diagnosed as the bilateral renal cystadenocarcinoma in German shepherd dog.

• 대한치과보철학회지
• /
• 제43권1호
• /
• pp.30-40
• /
• 2005

Purpose. The purpose of this study was to compare the fracture strength of the IPS Empress ceramic crown according to the incisal reduction (2.0mm, 2.5mm, 3.0mm) and axial inclination ($4^{\circ}$, $8^{\circ}$, $12^{\circ}$) of the upper canine. Material and methods. After 10 metal dies were made for each group, the IPS Empress ceramic crowns were fabricated and each crown was cemented on each metal die with resin cement. The cemented crowns mounted on the testing jig were inclined 30 degrees and the universal testing machine was used to measure the fracture strength. Results. 1. The fracture strength of the ceramic crown with 3.0mm depth and $12^{\circ}$ inclination was the highest (839N) Crowns of 2.0mm depth and $12^{\circ}$ inclination had the lowest strength (559N). 2. There was no significant difference in the fracture strength by axial inclination in the same incisal reduction group. 3. The fracture mode of the crowns was similar. Most of fracture lines began at the loading area and extended through proximal surface perpendicular to the margin irrespective of incisal reduction.

• 대한소아치과학회지
• /
• 제31권4호
• /
• pp.630-635
• /
• 2004

정중과잉치의 원인은 잘 알려지지는 않았지만 dental lamina의 hyperactivity에 의해 발생한다는 가설이 가장 많이 받아들여지고 있다. 이러한 정중과잉치의 병발증으로는 주변 영구절치의 맹출 장애, 만곡 치근, 치근흡수, primordial 혹은 follicular cyst의 형성, 회전, 이환된 부위의 총생 및 비정상적인 정중이개를 일으킬 수 있다. 이러한 이유로 영구전치의 회전이 야기되면 보통 공간의 부족은 적거나 없으며 재발이 흔하므로 과개선이 요구된다. 재발의 방지를 위해서는 조기치료, 과개선, 긴 보정기간, 적절한 접촉면의 형성, 짝힘의 사용, 그리고 수술적인 방법 등이 제안되어왔다. 이에 저자는 정중과잉치로 인하여 심하게 회전된 상악중절치를 주소로 내원한 환아에서 교정적, 외과적 술식을 이용하여 양호한 결과를 얻은 두 증례를 보고하는 바이다.

• Journal of Gastric Cancer
• /
• 제19권4호
• /
• pp.473-483
• /
• 2019

Surgical therapy for adenocarcinoma of the esophagogastric junction II requires distal esophagectomy, in which a transhiatal management of the lower esophagus is critical. The 'dorsal track control' (DTC) maneuver presented here facilitates the atraumatic handling of the distal esophagus, in preparation for a circular-stapled esophagojejunostomy. It is based on a ventral semicircular incision in the distal esophagus, with an intact dorsal wall for traction control of the esophagus. The maneuver facilitates the proper placement of the purse-string suture, up to its tying (around the anvil), thus minimizing the manipulation of the remaining esophagus. Furthermore, the dorsally-exposed inner wall surface of the ventrally-opened esophagus serves as a guiding chute that eases anvil insertion into the esophageal lumen. We performed this novel technique in 21 cases, enabling a safe anastomosis up to 10 cm proximal to the Z-line. No anastomotic insufficiency was observed. The DTC technique improves high transhiatal esophagojejunostomy.

• 대한방사선치료학회지
• /
• 제10권1호
• /
• pp.69-77
• /
• 1998

When a high energy photon beam is used to treat lesions located in the upper respiratory air passages or in maxillary sinus, the beams often must traverse an air cavity before it reaches the lesion. Because of this traversal of air, it is not clear that the surface layers of the lesion forming the air-tumor tissue interface will be in a state of near electronic equilibrium; if they are not, underdosing of these layers could result. Although dose corrections at large distances beyond an air cavity are accountable by attenuation differences, perturbations at air-tissue interfaces are complex to measure or calculate. This problem has been investigated for 4MV and 10MV X-ray beams which are becoming widely available for radiotherapy with linear accelerator. Markus chamber was used for measurement with variouse air cavity geometries in X-ray beams. Underdosing effects occur at both the distal and proximal air cavity interface. The magnitude depended on geometry, energy, field sizes and distance from the air-tissue interfaces. As the cavity thickness increased, the central axis dose at the distal interface decreased. Increasing field size remedied the underdosing, as did the introduction of lateral walls. Fellowing a $20{\times}2{\times}2\;cm^3$\;air\;cavity,\;4{\times}4\;cm\;field\;there\;was\;an\;11.5\%\;and\;13\%\;underdose\;at\;the\;distal\;interface,\;while\;a\;20{\times}20{\times}2\;cm^3\;air\;cavity\;yielded\;a\;24\%\;and\;29\%$ loss for the 4MV and 10MV beams, respectively. The losses were slightly larger for the 10MV beams. The measurements reported here can be used to guide the development of new calculation models under non-equilibrium conditions. This situation is of clinical concern when lesions such as larynx and maxillary carcinoma beyond air cavities are irradiated.

• 한국어병학회지
• /
• 제17권1호
• /
• pp.21-28
• /
• 2004

양식 미꾸라지 (Misgurnus mizolepis)가 수중으로 잠입하지 못하고 양어지의 물표면에 배를 위로 한 채 힘없이 회전 유영을 하는 질병이 발생하였다. 병어는 복부가 팽만되어 있었으며, 해부하여 보면 소화관에 커다란 공기방울의 축적, 장염이 현저하였다. 병어를 혈액학적으로 조사한 결과 적혈구수, Ht치 및 Hb 농도는 건강어와 차이가 없었다. 병리조직학적으로는 아가미의 호흡상피의 증생과 새변의 유착, 소화관 상피세포의 출혈, 괴사 및 박리가 관찰되었다. 뒷지느러미와 항문사이를 실로 결박하여 항문으로부터 공기의 배출을 억제한 재현 실험에서 발병어와 같은 증상이 재현되었다. 따라서 이 병은 빠른 성장을 목적으로 고단백질 사료를 투여함으로서 장호흡을 위하여 마신 공기가 소화관내에 축적되고, 축적된 공기의 부력 때문에 물속으로 하강하지 못하게 되고, 또 소화관을 압박하여 소화관에 순환장애를 일으킨 결과 폐사한 것으로 추정된다.

• Bulletin of the Korean Chemical Society
• /
• 제18권6호
• /
• pp.618-622
• /
• 1997

The polysiloxane-bridged dinuclear metallocenes $[(SiMe_2O)_n-SiMe_2(C_5H_4)_2][(C_9H_7)ZrCl_2]_2$ (n=1 (7), 2 (8), 3 (9)) have been generated as a model complex for the immobilized metallocene at silica surface by treating the respective disodium salts of the ligands with 2 equivalents of $(C_9H_7)ZrCl_3$ in THF. All three complexes are characterized by $^1H$ NMR and measurement of metal content through ICP-MS. It turned out that the values of ${\Delta}{\delta}=[{\delta}_d-{\delta}_p]$, the chemical shift difference between the distal $({\delta}_d)$ and proximal $({\delta}_p)$ protons, for the produced dinuclear compounds (0.47 for 7, 0.49 for 8, and 0.5 for 9) were larger than the Δδ value of the known ansa-type complex holding the same ligand as a chelating one, that is just the opposite to the normal trend. In order to compare polymerization behavior of the dinuclear metallocene with the corresponding mononuclear metallocene, (Cp)$(C_9H_7)ZrCl_2$ was separately prepared. To investigate the catalytic properties of the dinuclear complexes and mononuclear metallocenes ethylene polymerization has been conducted in the presence of MMAO. The polymerization results display the typical activity dependence on polymerization temperature for all complexes. The most important feature is that the polymers from the dinuclear metallocenes represent enormously improved molecular weight compared with the polymer from the corresponding mononuclear metallocene. In addition, the influence of the nature of the bridging ligand upon the reactivities of the dinuclear metallocenes has also been observed.

• 치위생과학회지
• /
• 제19권3호
• /
• pp.162-169
• /
• 2019

Background: Oral diseases are caused by various systemic and local factors, the most closely related being the biofilm. However, the challenges involved in removing an established biofilm necessitate professional care for its removal. This study aimed to evaluate and compare the effects of professional self and professional biofilm care in healthy patients to prevent the development of periodontal diseases. Methods: Thirty-seven patients who visited the dental clinic between September 2018 and February 2019 were included in this study. Self-biofilm care was performed by routine tooth brushing and professional biofilm care was provided using the toothpick method (TPM) or the oral prophylaxis (OP) method using a rubber cup. Subgingival bacterial motility and halitosis (levels of hydrogen sulfide, $H_2S$; methyl mercaptan, $CH_3SH$; and di-methyl sulfide, $(CH_3)_2S$) were measured before, immediately after, and 5 hours after the preventive treatment in the three groups. Repeated measures analysis of variance test was performed to determine significant differences among the groups. Results: TPM was effective immediately after the prevention treatment, whereas OP was more effective after 5 hours (proximal surfaces, F=16.353, p<0.001; smooth surfaces, F=66.575, p<0.001). The three components responsible for halitosis were effectively reduced by professional biofilm care immediately after the preventive treatment; however, self-biofilm care was more effective after 5 hours ($H_2S$, F=3.564, p=0.011; $CH_3SH$, F=6.657, p<0.001; $(CH_3)_2S$, F=21.135, p<0.001). Conclusion: To prevent oral diseases, it is critical to monitor the biofilm. The dental hygienist should check the oral hygiene status and the ability of the patient to administer oral care. Professional biofilm care should be provided by assessing and treating each surface of the tooth. We hope to strengthen our professional in biofilm care through continuous clinical research.