• 제목/요약/키워드: Irradiation site

검색결과 177건 처리시간 0.021초

지각과민치아에 대한 Nd:YAG 레이저 조사의 효과 (Desensitizing Effects of a Nd:YAG Laser Irradiation on Hypersensitive Dentine)

  • 정성용;김경희;고명연;안용우;박준상
    • Journal of Oral Medicine and Pain
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    • 제30권4호
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    • pp.465-473
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    • 2005
  • 냉온자극 또는 잇솔질에 불편감을 호소하는 치과 외래 환자를 72명을 대상으로 레이저 조사를 시행한 실험군(45명)과 모의 레이저 조사를 시행한 대조군(27명)으로 나누어 지각 과민 치아의 치경부에 냉자극 및 기계적 자극을 가하여 대상자가 느끼는 불편감을 NPS로 평가하였다. 치아의 통증역치 평가를 위하여 전기치수검사기(EPT)를 사용하였다. 각 치아에 대한 레이저 조사에는 pulsed Nd:YAG 레이저를 사용하였고 조사조건은 1.5W, 20Hz, 75mJ/pulse으로 4분간 비접촉식으로 시행하였다. 대상자의 반응을 레이저 조사 전과 직후, 1주 이내, 2주 이내 각각 평가하여 다음과 같은 결과를 얻었다. 1. 지각 과민 치아에 대한 Nd:YAG 레이저 조사는 지각 과민을 완화시켜 주었으며 대조군에 비해 그 효과가 현저하였다. 2. 심한 지각 과민을 호소하는 치아에 대한 위약 효과는 존재하였으나 중등도의 지각 과민을 호소하는 치아에 대한 위약효과는 배제할 수 있었다. 3. 지각 과민 치아에 대한 Nd:YAG 레이저 조사는 전기치수검사에 의한 통증역치에 영향을 주지 않았다. 4. 지각 과민 치아에 대한 Nd:YAG 레이저 조사의 효과는 최소 2주는 지속되었다. 따라서 지각 과민 치아에 대한 치료법의 하나로 Nd:YAG 레이저 조사가 임상적으로 유용할 것으로 사료된다.

비인강암의 강내조사법 (Intracavitary Irradiation of Carcinoma of the Nasopharynx)

  • 허승재;박찬일
    • Radiation Oncology Journal
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    • 제3권2호
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    • pp.159-161
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    • 1985
  • 비인강암의 강내조사법은 외부조사후 추가조사법으로서, 또한 재발병소에 비교적 용이하게 재조사할 수 있는 장점이 있으며 비인강암의 국소치유율을 상승시킬 수 있다. 저자는 비인강암 환자에게 추가조사법으로서 또한 재발된 예에서 비인강암의 강내조사를 시행하여 보고하는 바이다.

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Photoreaction of 1-(o-Allyloxyphenyl)-2-pentamethyldisilanylethyne with Methanol or Acetone

  • 심상철;박승기
    • Bulletin of the Korean Chemical Society
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    • 제19권6호
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    • pp.686-689
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    • 1998
  • Irradiation of 1-(o-allyloxyphenyl)-2-pentamethyldisilanylethyne (2) in methanol yields two 1 : 1 photoaddition products (3 and 4) via silacyclopropene intermediate. Photolysis of (2) with acetone in deaerated methylene chloride yields site specific and regioselective 1: 1 adducts (7 and 8) via silacyclopropene and 1-sila-1,2-propadiene intermediate, respectively.

방사선조사 및 고압산소요법이 미세혈관 문합술에 미치는 영향 (THE EFFECTS OF IRRADIATION AND HYPERBARIC OXYGEN THERAPY ON MICROVASCULAR ANASTOMOSIS)

  • 최성원;김병용;박정현;윤정훈;육종인;유재하;이의웅;차인호
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • 제26권5호
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    • pp.455-461
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    • 2000
  • Malignant tumors of the head and neck frequently require treatment with both radiotherapy and surgery. Reconstruction of the defect in previously irradiated field is a challenge to surgeon, who must produce both a functional and an esthetic result. Hyperbaric oxygen therapy(HBO) has been used in an attempt to reduce the deleterious effects of radiation. But the issue of whether prior irradiation and HBO of the recipient site of a free flap affects the result of reconstruction continues to generate controversy. So, the effects of irradiation and hypergbaric oxygen therapy on microvascular anastomosis was evaluated in an experimental study in femoral vessels of rats. The experimental groups were divided into 3 groups, contorol group, irradiation group, and irradiation and HBO group. Preoperative irradiation was delivered in the left groin field with single dose corresponding 2,000cGy and total 48 hours of HBO was given 100% oxygen at 2.4 atmosphere for 4 weeks. The femoral vessels of 60 rats were anastomosed after irradiation and HBO treatment. Three days, 1 week, 2 weeks and 4 weeks after surgery, the femoral vessels were evaluated for patency and histopathologic changes. There was no notable effect of irradiation on patency of femoral vessels in rats and the radiation effects were obvious on histological examination which showed the sloughing of the endothelial cells, subintimal hyperplasia and fibrosis on the media and adventitia of femoral arteries. The histologic changes of the femoral veins were mild and not typical. But the effects of hyperbaric oxygen therapy after irradiation was seen not marked difference in irradiation group.

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직장암의 방사선 치료결과 및 실패양상 (The Result and Failure after Adjuvant Postoperative Irradiation in Carcinoma of Recum)

  • 김철용;최명선
    • Radiation Oncology Journal
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    • 제11권1호
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    • pp.133-141
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    • 1993
  • From Jan.1982 to Dec.1990, 77 patients with rectal cancer were treated with curative surgical resection followed by postoperative adjuvant irradiation alone or combined with chemotherapy at the Department of Radiation Oncology, Korea University Hospital (KUH). Fifty-four (54/77, $70.1{\%}$) patients underwent abdominoperineal resection , 20 (20/77, $26{\%}$) patients underwent low anterior resection, and 3 (3/77, $3.9{\%}$,) patients had wide excision only. Thirty-nine (39/77, $50.5{\%}$) received sequential chemotherapy (2 cycles to 12 cycles). The 5-year survival rate for the entire group was $43{\%}:\;78.2{\%}$ in B2+B3, $39.4{\%}$ in stage C1+C2+C3. Survival rates decreased with increasing penetration of the bowel wall by tumor and the presence of regional lymph node metastasis. Those patients survival who underwent an abdominoperineal resection also experienced a significant decrease in compared to low anterior resection ($23.1{\%}$ vs. $63.8{\%}$ in 5-year survival, p <0.05). Local failure occurred in 15 ($19.5{\%}$) out of the 77 patients overall, 1($5.3{\%}$) of 19 in stage B2+B3, and 14 ($24.1{\%}$,) of 58 in stage C1+C2+C3. Presacral area was most common site of local failufre (8/17, $47.1{\%}$). Distant failure occurred in 13 ($16.9{\%}$) of 77 patients. The most frequent site of distant failure was the lung followed by the liver, the bone, and the brain. Combined locoregional and distant failure occurred in 2 ($2.6{\%}$) of 77 patients. Pathological confirmation of perirectal fat and/or regional lymph node involvement resulted in a singificant decrease in survival and local control.

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환경요인에 의한 잣나무의 지위지수 추정식 개발과 적지 판정 (Development of a Site Index Equation for Pinus koraiensis Based on Environmental Factors and Estimation of Productive Areas for Reforestation)

  • 신만용;정일빈;구교상;원형규
    • 한국농림기상학회지
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    • 제8권2호
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    • pp.97-106
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    • 2006
  • Site index is an essential tool to estimate forest productivity. Generally, a site index equation is developed and used from the relationship between stand age and dominant tree heights. However, there is a limit to the use of the site index equation in the application of variable ages, environmental influence, and estimation of site index for the unstocked forest. Therefore, it has been attempted to develop a new site index equation based on various environmental factors including site, climate, and topographical variables. This study was conducted to develop a site index equation based on the relationship between site index and environmental factors for the species of Pinus koraiensis in Yangpyung-Gun, Gyunggi Province. The influence of climatic factors (temperature and solar irradiation ratio), topographical factors (elevation, slope, ratio of slope to valley and aspect) and soil profiles (soil depth by layer and soil consistency) on site index were evaluated by multiple regression analysis. Five environmental factors were selected in the final site index equation for Pinus koraiensis. The site index equation developed in this study was also verified by three evaluation statistics: model's estimation bias, model's precision, and mean square error of measurement. Based on the site index equation, the number of productive areas for Pinus koraiensis were estimated by applying GIS technique to digitized forest maps. In addition, the distribution of productive areas was compared with the areas of current distribution of Pinus koraiensis. It is expected that the results obtained in this study could provide valuable information about the amount and distribution of productive areas for Pinus koraiensis reforestation.

저출력 레이저가 마우스 모발성장에 미치는 영향 (The Effect of Low-power Laser on the Murine Hair Growth)

  • 정필상;김진왕;이정옥;이정구;오충훈;김유찬;정상운
    • Archives of Plastic Surgery
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    • 제32권2호
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    • pp.149-154
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    • 2005
  • Low-power laser(LPL) delivers a small amount of energy without elevation of tissue temperature. LPL has been reported to have biostimulation effects including anti-inflammatory, analgesic, regenerative, immunocorrective, and vasodilative effects. However, the effect of LPL on hair growth has rarely been studied. We investigated the effect of LPL on hair growth in the mouse. After depilation of back skin of mice, we classified the mice into 4 groups: control, laser irradiated group, $MoandMore^{(R)}$ applied group, and Spella $707^{(R)}$ applied group. Laser irradiation or application of these drugs were performed on the back skin of the mice for 30 days. The results are summarized as follows. Hair growth of control was first observed at 13 days after depilation, and complete hair regrowth was observed at 25 days. Hair growth of both laser irradiation group and $MoandMore^{(R)}$ applied group was first observed at 9 days after depilation, and complete hair regrowth was observed at 20 days. Hair growth of Spella $707^{(R)}$ applied group was firstly observed at the 9 days after depilation, and complete hair regrowth was observed at the 15 days. Hair growth started at the irradiation site in the laser irradiation group, but it started at the random sites in other groups. In conclusion LPL irradiation have a stimulating effect on the hair growth in the mouse.

Co-60조사가 백서 발치창 치유과정에 미치는 영향에 관한 실험적 연구 (AN EXPERIMENTAL STUDY OF THE EFFECT OF CO-60 IRRADIATION ON THE HEALING PROCESS OF EXTRACTION WOUNDS IN WHITE RATS)

  • 유영준
    • 치과방사선
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    • 제12권1호
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    • pp.105-113
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    • 1982
  • Because of the development of rampant caries, osteomyelitis and osteoradionecrosis that occur after radiation therapy of oral cancers, extraction of teeth at or near the malignant lesion has been done in the past. Few, however, have studied the radiation effect on the healing of extraction wounds. This study is concerned with the effect of Co-60 irradiation on the healing process of extraction wounds in rats. Fifty six, male, Spraque-Dawley rats are used. The right first molar of the mandible is extracted from all animals. They are divided into three experimental groups of 14 each and a control group of 14. Three experimental groups are irradiated respectively with 200 rad, 400 rad and 600 rad and a pair of rats in each group are killed on days 1, 3, 5, 7, 14, 21 and 28 after irradiation. Two animals from the control group are killed on the day when the experimental rats are killed. The irradiated hemimandibles are fixed in 10% neutral formalin, decalcified in 5% trichloroacetic acid, embedded in paraffin and sectioned. The sections are stained in hematoxylin and eosin, van Gieson, Masson's trichrome or silver nitrate. Results show that in general radiation effects on healing extraction wounds are dose dependent; i.e., the higher is the dose, the greater is the histologic changes observed: 1. Irradiation tends to retard blood clot organization and epithelial regeneration. 2. An increase in the number of giant cells and osteoclasts is noted after irradiation. 3. Formation of regenerating connective tissues around and within the extraction site is com- promised, and a clear reduction of primitive mesenchymal type connective cells is noted. 4. The healing process begins along the lateral aspect of the extraction socket in the control, while irregular histologic appearances of the brabecular pattern is present in the experimental rats.

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송과선종의 방사선치료 (Radiation Therapy of Midline Pineal Tumors and Suprasellar Germinoma)

  • 서창옥;김귀언;서정호;박창윤;추성실
    • Radiation Oncology Journal
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    • 제1권1호
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    • pp.69-77
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    • 1983
  • 20 cases of midline pineal tumors and 3 suprasellar germinomas received radiation therapy at Yonsei University Medical College, Severance hospital from 1971 to 1982 were reviewed. 12 cases were pathologically proved; 10 germinomas, 1 pineoblastoma, and 1 pineocytoma. 11 cases received radiotherapy without biopsy confirmation. Although treatment fields varied from small field to whole brain irradiation, but not to the spinal cord, most patients received 4000-5000 rads irradiation to the primary tumor site. 17 patients are alive without evidence of disease and 5 year actuarial NED survival is 73.2%. 9 of 10 biopsy proved germinomas and all 6 presumed germinomas are alive and well. Optimum radiation dose, adequate irradiation field, tumor response to radiation observed in serial CT scan and role of radiation therapy in the management of pineal tumors are also discussed.

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마이크로파 조사에 따른 개질화 활성탄의 온도특성 및 벤젠흡착 (Temperature Characteristics of the Modified GAC by Microwave Irradiation and Benzene Adsorption)

  • 최성우;김윤갑
    • 한국환경과학회지
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    • 제15권6호
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    • pp.579-586
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    • 2006
  • The purposes of this paper were to monitor the temperature rising courses and spark discharge of the modified granular activated carbon (GAC) by microwave (MW) irradiation and to evaluate absorption of benzene. The GAC coated on $SiO_2$, boron, talc, ferrite was named as the modified GAC. Thermal and spark discharge measurement of virgin GAC and modifed GAC has been carried out using a MW device operating at 2450 MHz under various energy conditions. The results of this paper as follows. First, the modified GAC is more efficient than the virgin GAC in temperature control. Temperature gradient of the modified GAC is more lower than that of virgin GAC. The temperature gradient of GAC was observed in the following order : virgin GAC, Mn-Zn ferrite/GAC, Ni-Zn ferrite,/GAC, $SiO_2/GAC$, Boron/GAC, Talc/GAC. Second, the spark discharge of the modified GAC was diminished, compared with that of virgin GAC. Because of its excellent electrical insulating properties, the coating material prevents the spark discharge. Finally, the benzene adsorption capacity of the modified GAC decreased due to diminishing of adsorption site by the coating material. Considering the temperature gradient and spark discharge of GAC, the GAC coated $SiO_2$ would be appropriate absorbent under irradiation of MW.