• Journal of Periodontal and Implant Science
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• 제35권1호
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• pp.177-185
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• 2005

The purpose of the study was to investigate the influence of an endodontic infection on presence of furcation involvement in periodontally-involved mandibular molars. All first and second mandibualr molars in 45 patients were selected if at least one was root-filled or had a possible periapical radiolucency. The sample consisted of patients from a referral population at a periodotnal clinic which represented an adult population with a mean age of 47.5 years (range 31 to 63) For mandibular molars with periapical destruction at both roots, frequency of horizontal furcation depth ${\geqq}$ 3 mm was significantly more compared to teeth without periapical destruction. Mean periodontal probing depth was significantly greater at mandibular molars with periapical destruction. It is suggested that a root canal infection in periodontitis-involved molars may potentiate periodontitis progression by spreading of endodontic pathgens through patent accessory canals and dentinal tubules. In conclusion, an endodontic infection in mandibular molars was found to be associated with additional attachment loss in the furcation area, and may thus be considered to be one of several risk factors influencing the prognosis of molars in periodontitis-prone patients.

• Annals of Clinical Neurophysiology
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• 제4권1호
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• pp.85-88
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• 2002

Ramsay-Hunt syndrome is a viral disease associated with peripheral facial nerve paralysis accompany by erythematous vesicular rashs on the ear(zoster oticus) or in the mouth. Based on clinical presentations that indicated involvement of more than one ganglion, the gasserian, geniculate, petrous, accessory, jugular and second and third dorsal root ganglia comprised a chain in which inflammation of a single ganglion could extend to nearby ganglia. A 71-year-old man presented with left. peripheral facial palsy with otalgia, vesicular eruption in $V_2$, $V_3$, C2, C3 dermatome, tinnitus, and hearing loss.

• 한국산림과학회지
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• 제40권1호
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• pp.70-74
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• 1978

잣나무묘목(苗木)의 자엽수(子葉數)에 따른 성장(成長) 및 침엽형질(針葉形質)과의 상관(相關)을 구명(究明)하고져 자엽수별(子葉數別)로 등급화(等級化)한 묘목(苗木)의 초생엽(初生葉), 본엽(本葉), 그리고 묘목성장(苗木成長) 등(等)의 형질(形質)을 조사(調査)한 결과(結果)를 다음과 같이 요약(要約)한다. 1. 초생엽(初生葉)의 엽수(葉數)와 자엽수간(子葉數間)에 1%의 유의성(有意性)이 있었고 초생엽장(初生葉長), 폭(幅), 기공선수(氣孔線數)에 관(關)하여는 유의성(有意性)을 인정(認定)할 수 없었다. 2. 초생엽(初生葉)의 부수지구(副樹脂溝)는 6월말경(月末頃)까지 거의 발달(發達)되지 않았고 소수(少數)는 7월(月) 이후(以後)부터 1~2개(個) 발달(發達)하기 시작하였으며 자엽수(子葉數)에 따른 부수지구수(副樹脂溝數)의 차이(差異)는 없었다. 3. 본(本) 엽수(葉數)와 자엽수간(子葉數間)에는 5%의 유의성(有意性)을 인정(認定)할 수 있었으나 엽장(葉長), 엽폭(葉幅), 기공선수(氣孔線數)는 자엽수(子葉數)와 관련(關聯)이 없었다. 4. 묘고(苗高), 근원직경(根元直徑)은 자엽수(子葉數)와 5%의 유의성(有意性)이 있었다. 5. 묘목성장(苗木成長)을 보연 자엽수(子葉數) 12매이상(枚以上)인 묘목(苗木)은 성장(成長)이 매우 양호(良好)하였다. 그래서 그 이하(以下)의 것은 간인(間引)의 대상이 될 것으로 생각되었다.

• Restorative Dentistry and Endodontics
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• 제34권2호
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• pp.137-144
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• 2009

본 연구는 한국인의 하악 제1 대구치 60개를 대상으로 생리적 근단공의 크기와 형태, 근심 치근의 치근단 3mm에서 isthmus의 발생 빈도와 형태, 그리고 원심 치근의 치근단 3mm의 근관 형태를 입체현미경하에서 60배로 조사한 결과 다음과 같은 결론을 얻었다. 1.근심 치근은 두 개의 근단공을 가지는 비율이 높았으며(51.67%), 원심 치근은 하나의 근단공을 가지는 비율이 높았다(71.66%). 2. 부근단공의 빈도는 근심 치근의 1개의 근단공을 가지는 경우가 가장 높았다(26.07%) 3. 생리적 근단공의 크기는 근심 치근에서 하나의 근단공을 가지는 경우 0.329mm, 근심 협측 근단공은 0.266mm, 근심 설측 근단공은 0.246mm였으며, 원심 치근에서 하나의 근단공을 가지는 경우 0.375mm, 원심 협측 근단공은 0.291mm, 원심 설측 근단공은 0.237mm로 나타났다. 4. 근단공의 형태는 oval 형태 (69.93%)가 가장 많았다. 5.근심 치근의 치근단 3mm에서 isthmus의 발생빈도는 55%였으며, partial isthmus는 31.66%, complete isth-mus는 23.34%로 나타났다. 6.원심 치근의 치근단 3mm의 근관 형태는 oval형태(50.64%)가 가장 많았다. 이상의 연구 결과 하악 제1대구치의 성공적인 근관 치료를 위해서는 생리적 근단공의 실제 크기와 형태 및 isthmus의 존재에 대한사전 지식이 필요할 것이다.

• 치과방사선
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• 제21권2호
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• pp.393-403
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• 1991

The purpose of this study was to evaluate the incidence and radiographic features of 1,300 cases of supernumerary teeth by means of the analysis of periapical radiograms and/or pantomograms in 69,442 persons visited the Department of Oral Radiology, School of Dentistry, Kyung Hee University during January 1980 to December 1989. This study of supernumerary teeth revealed the following features: 1. The incidence of supernumerary tooth was revealed to be 1.5% in total examined persons, and there was a higher incidence in males (74.0%) than in females (26.0%). 2. The supernumerary teeth were most frequently occurred in the 1 st decade (42.7%), followed by the 2nd decades (20.2%), the 3rd decades (14.1 %), and the 5th decades (7.2%). 3. There was a higher incidence in the maxilla (98.7%) than in the mandible (1.3%), and mesiodens (90.1 %) was the most frequently occurred. The maxillary lateral incisor region (3.1%) was next in order of frequency followed by maxillary distomolar (2.2%), and maxillary paramolar (1.5%). 4. There was a higher incidence of the impaction (82.7%) than that of the eruption (17.3%), and supernumerary tooth in lateral incisor region (87.8%) was the most frequently impacted one. 5. The inverted impaction was occurred in 63.1%, the vertical impaction in 18.1%, and the angulated impaction in 18.8%. In localization, a palatally (lingually) impacted supernumerary tooth was occurred in 85.0%, and middle impacted and buccally (labially) impacted supernumerary tooth showed the same incidence (7.5%). 6. A supplemental tooth was occurred in 3.2%, an accessory tooth in 96.8%, and a supplemental tooth was the most frequently occurred in maxillary lateral incisor and mandibular premolar region. 7. In effects of supernumerary tooth on adjacent tooth, crowding was occurred in 0.4%, diastema in 10.6%, rotation in 5.4%, eruption disturbance in 4.5%, root resorption in 2.5%, and dentigerous cyst in 2.2%.

• Journal of Korean Neurosurgical Society
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• 제48권2호
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• pp.139-144
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• 2010

Objective : We report our surgical experience in the treatment of 16 consecutive patients with benign craniovertebral junction (CVJ) tumor, observed from 2003 to 2008 at our department. Methods : We had treated 6 foramen magnum meningiomas, 6 cervicomedullary hemangioblastomas, 1 accessory nerve schwannoma, 1 hypoglossal nerve schwannoma, 1 C2 root schwannoma, and 1 cavernous hemangioma. Clinical results were evaluated by Karnofsky Performance Scale (KPS) and all patients underwent preoperative neuroradiological evaluation with computed tomography (CT) and magnetic resonance image (MRI). Angiography was performed in 15 patients and preoperative embolization was done in 2 patients. Results : Five far-lateral, 1 supracondylar and 10 midline suboccipital approaches were performed. Gross total removal was achieved in 15 cases (94%) and subtotal removal in 1 patient (6%). None of the patients required occipitocervical fusion. Radiological follow-up showed no recurrence in cases totally removed. Postoperative decrease of KPS scores was recorded in only 1 patient. The treatment of cervicomedullary solid hemangioblastoma presented particular issues : by preoperative embolization, we removed tumor totally without an excessive bleeding or brainstem injury. In one of foramen magnum meningioma, we carried out subtotal removal due to hard tumor consistency and encasement of neurovascular structures. Conclusion : The choice of surgical approaches and the extent of bone resection should be defined according to the location and size of individual tumors. Moreover, we emphasize that preoperative neuroradiological evaluations on presumptive tumor type could be helpful to the surgeon in tailoring the technique and providing the required exposure for different lesions, without unnecessary surgical steps.

• 대한본초학회지
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• 제21권4호
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• pp.183-187
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• 2006

Objectives : Southern, northern, and wild types of Osterici Radix, and Notopterigii Rhizoma et Radix imported from China are circulated in Korea. Morphological identification was attempted by comparing powder forms of these materials. Methods : To make the specimen, the samples were grinded, and the powder was mounted by a solution of Glycerin, Acetic acid and Water at the rate of 1 : 1 : 1. The specimen was mounted by optic microscope, photographs were taken and the characteristics were sketched in lines. Result : 1. Korean Osterici Radix was yellow-brown, but Chinese Notopterigii Rhizoma et Radix was dark-brown. 2. Oil ducts were mostly broken, and most of secretory cells were narrow and long, including yellow or light yellow secretion and starch grain. 3. Parenchyma cells were rectangular, and southern type of Osterici Radix and Chinese Notopterigii Rhizoma et Radix include lots of starch grain in parenchyma cells, while northern type of Osterici Radix and wild Osterici Radix include a little. 4. Vessels were usually reticulate vessel, and the diameter of the vessels of Korean Osterici Radix was $25{\sim}88{\mu}m$, while that of the vessels of Chinese Notopterigii Rhizoma et Radix was $13{\sim}52{\mu}m$. 5. The surface of accessory cells were light brown with the shape of irregular polygon. Conclusion : Southern type of Osterici Radix, nothern type of Osterici Radix, wild Osterici Radix, and Chinese Notopterigii Rhizoma et Radix were all alike, except the amount of starch grain in parenchyma cells.

• Journal of Korean Dental Science
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• 제7권1호
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• pp.31-37
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• 2014

Dentigerous cyst (DC) is an odontogenic cyst associated with the crown of an impacted, embedded, unerupted, or developing tooth. It is the second most common type of odontogenic cysts, accounting for 14% to 24% of all jaw cysts. Although these cysts occur more frequently during the second and third decades of life, they can also be found in children and adolescents in the mixed dentition stage. Treatment of the odontogenic cyst involves enucleation or marsupialization/decompression methods. The latter approach is preferred for larger cysts, and it is especially helpful in adolescent patients in conserving the unerupted permanent successors. The aim of treatment for DC is the complete elimination of pathology and maintenance of dentition with minimal surgical intervention. Recently defined criteria for the selection of treatment modality include the cyst size and location of the cyst, patient age, dentition involved, stage of root development, position of the tooth involved in the jaw, and relationship with the surrounding vital structure. Marsupialization or decompression technique has been advocated by several authors for treating DCs among young patients. In this conservative technique, the creation of an accessory cavity helps relieve intra-cystic pressure and accelerate the healing of cystic lesion. This technique has been successfully performed and is indicated for growing children and adolescents. Here, we report a large cyst lesion in the mandible treated by marsupialization for conservative management. In conclusion, successful reduction in size was achieved, and intraoperative complication could be prevented.

• 한국토양비료학회지
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• 제18권1호
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• pp.78-88
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• 1985

질소(窒素)의 형태(形態)가 상이(相異)한 몇가지 비종(肥種)이 수도(水稻)의 생육(生育) 및 수량(收量)에 미치는 영향(影響)을 구명(究明)코자 진주(眞珠)벼를 공시품종(供試品種)로 하여 4가지 질소형태(窒素形態)와 7종(種)의 비종(肥種)으로 질소(窒素) 시비량(施肥量)을 달리하여 Pot시험(試驗)한 결과(結果)를 요약(要約)하면 다음과 같다. 1. 토양중(土壤中) pH는 $NH_4-N$인 Ammonium Sulfate의 시용량(施用量)이 증대(增大)할수록 낮아졌으며 $NO_3-N$의 경우 부성분(副成分)이 없는 Nitric Acid구(區)는 시간이 경과함에 따라 pH가 높아졌으나 부성분(副成分)이 있는 $NO_3-N$ 비료(肥料)는 변화(變化)가 적었다. 2. 토양중(土壤中) $NH_4{^+}$ 함량(含量)은 N 15kg/10a구(區)에서는 비료형태(肥料形態)나 비종(肥種)에 관계없이 이앙후(移秧後) 14일(日)에 가장 낮았다. N 30kg/10a구(區)에서는 $NH_4-N$, Urea-N 등(等)은 17~24일(日)에 함량(含量)이 가장 낮았으나 $NO_3-N$는 31일(日)까지 계속 감소(減少)하였다. 3. 생육상황(生育狀況)은 질소시용량간(窒素施用量間)에 다소(多少) 차이(差異)가 있지만 간장(稈長), 고중(藁重) 등(等) 지상부(地上部)의 생육(生育)은 질소형태별(窒素形態別)로는 $NH_4-N$인 인산(燐酸)을 함유(含有)한 Ammonium Phosphate구(區)와 유황(硫黃)을 함유(含有)한 Ammonium Sulfate구(區), 그리고 Urea-N인 Urea구(區)에서 양호(良好)하였고 지하부(地下部) 뿌리의 생육(生育)은 $NO_3-N$인 질산구(窒酸區), Potassium Nitrate구(區) 및 Calcium Nitrate구(區)에서 양호(良好)하였다. 4. 수도(水稻)의 수량(收量)은 질소형태별(窒素形態別)로는 질소시용량간(窒素施用量間)에 다소(多少) 차이(差異)가 있으나 $NH_4-N$인 Ammonium Sulfate구(區), Ammonium Phosphates구(區)가 수량(收量)이 많았으며 $NO_3-N$인 Calcium Nitrate구(區) Potassium Nitrate구(區), Nitric Acid구(區)는 수량(收量)이 낮았다. 5. 식물체(植物體) 경엽중(莖葉中)에 N, P, Mg 및 Mn등(等) 무기성분(無機成分) 함량(含量)은 $NH_4-N$비료(肥料)에서 많았으며 Urea-N $NH_4-N+NO_3-N$의 순(順)로 적었다. 또한 $NO_3-N$ 비료(肥料)는 대체로 K, Ca 및 $SiO_2$ 등(等)의 무기성분(無機成分) 함량(含量)이 많았으나 N, P와 Mg, Mn, Fe 및 Mn등(等)의 함량(含量)이 적었다. 6. 식물체(植物體) 경엽중(莖葉中) 질소흡수(窒素吸收)의 증가(增加)는 인산흡수(燐酸吸收)를 증진(增進)시키는 상조작용(相助作用)이 있어 생육(生育) 및 수량증가(收量增加)에 기여하는 것으로 보였다. 반면(反面)에 $NO_3-N$ 비료(肥料) 중(中) K가 첨가(添加)된 비료구(肥料區)에서는 N, P, Ca 및 Mg, 그리고 Ca가 첨가(添加)된 비료구(肥料區)는 P, K 및 Mg 또한 $NO_3$-시용구(施用區)는 N, P, Mg흡수(吸收)를 감소(減少)시켰으며 N, P, Mg 및 Ca등(等)은 생육(生育) 및 수량증가(水量增加)에 크게 기여하는 것으로 보였다. 7. 수확기(收穫期) 벼 뿌리중 $SiO_2$, Zn, Fe 함량(含量)은 경엽(莖葉)에 비하여 많았고 N, P, Mg, Mn, Zn 및 Fe함량(含量)는 $NH_4-N$, Urea-N시용구(施用區)에서 많았고 K, Ca, $SiO_2$함량(含量)는 $NO_3-N$시용구(施用區)에서 많았다.