• Restorative Dentistry and Endodontics
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• 제39권1호
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• pp.56-62
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• 2014

A tooth with primary endodontic disease that demonstrates a periodontal defect might be extracted because of misdiagnosis as severe periodontal disease or a vertical root fracture. The aim of this case report was to demonstrate the long-term survival of endodontically treated teeth, which had been initially considered unsavable. With meticulous evaluation including the patient's dental history, clinical and radiographic examinations, teeth with primary endodontic lesions could be differentiated and saved after proper root canal treatment. Pain history, vitality test, and radiographic examinations, as well as a general periodontal condition check with periodontal probing on an affected tooth, might be the key methods to differentiate endodontic pathosis from that of periodontal disease.

• Mycobiology
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• 제39권2호
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• pp.113-117
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• 2011

A laboratory experiment was conducted to study the induction of constricting rings and test predation of Dactylaria brochopaga isolates against second stage juveniles (J2s) of Meloidogyne graminicola. Among the five fungal isolates, isolate D showed the greatest number of predatory rings and, consequently, trapped the maximum number of M. graminicola J2s in dual cultures. Another pot experiment was conducted to study the effect of D. brochopaga (isolate D) on the management of wheat root-knot disease. Applying a mass culture (10 g/pot) and a spore suspension of the fungus with and without cow dung manure to soil infested with 2,000 M. graminicola juveniles significantly improved plant height, root length, weights of shoots, roots, panicles and grains per hill compared to those in the control. Moreover, the fungus significantly reduced the number of root-knots, the number of egg masses, juveniles, and females per hill compared to those in the control. Bio-efficacy of the fungus was heightened when the mass culture and a spore suspensions were used in combination with cow dung manure to improve the plant growth parameters and reduce the number of root-knot and reproductive factors. Further investigations should be conducted to identify the impact of this fungus in the field.

• 식물병연구
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• 제20권2호
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• pp.87-94
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• 2014

인삼 재배지에서 가장 큰 피해를 나타내고 있는 뿌리썩음병원균은 Cylindrocarpon destructans로 연작장해의 원인으로 작용하고 있다. 2011과 2012년에 걸쳐 인삼 뿌리썩음병 발병포장으로부터 뿌리를 수집하여 병징 구분 후 57종의 C. destructans를 분리하였다. 분리한 뿌리썩음병원균중에서 34균주(61%)는 병원성이 낮았으며, 21균주(37%)는 무상처 접종에서도 병반을 형성하여 강한 병원성을 나타내었다. 또한 이들 분리균들을 PDA 배지에서 15일 배양한 결과 최적의 생장온도는 $20^{\circ}C$였으며, $35^{\circ}C$에서는 병원성에 관계없이 모두 생장하지 못하였다. 병원성에 따라 균총의 색과 균사의 생장정도에 차이를 나타내었다. 강한 병원성 균주는짙은 갈색을 나타낸 반면 병원성이 약한 균주들은 베이지색 또는 옅은 갈색을 나타내었다. pH 변화에 따른 균사 생장에 미치는 효과 조사를 위해 수경 재배한 결과 pH 7.0에서 보다 pH 5.0에서 균사생장이 양호하였다. 뿌리에서의 상처는 pH 변화와 관계없이 발병도를 더욱 증가시켰다. 인위적으로 조성한 발병 토양에 1-4년생 인삼뿌리를 이식하여 재배한 결과 2년생 뿌리에서 가장 감수성이었으며, 발병률도 79.5%로 가장 높았다. 뿌리썩음병 발병정도는 토양 내 접종 병원균의 밀도에 따라 영향을 받는 것으로 나타났으며, 병원균 접종농도 $3.5{\times}10^2cfu/g$ 처리구 보다 $2.0{\times}10^3cfu/g$ 처리구에서 높았다.

• Journal of Periodontal and Implant Science
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• 제28권4호
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• pp.809-822
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• 1998

Adequate root preparation in the treatment of periodontal disease often involves mechanical instrumentation to remove plaque, calculus perhaps contaminated cementum. Although meticulous scaling and root planing may remove some cementum, the use of aggressive root planing to remove cementum does not appear warranted. So ultrasonic device and rotary instrument appear to be replacing hand instrument. But it is not clear those instruments make smooth root surface as hand instrument. The roghness of the root surface were evaluate with SEM following instrumentation with Gracey curette, Perio Clean and piezo ultrasonic device(Setlec) with various tip. 20 extracted teeth were used in vitro experiment, and 9 teeth of a patient destined for extraction for periodontal reasons were utilized in vivo experiment. It was demonstrated that hand curette created the smoothest surface, while diamond tip tended to roughen the root surface. But the hand curette, Perio Clean, and piezo ultasonic device with scaler tip tend to remove cementum completely. Piezo ultrasonic device with curette-like tip made the desirable smooth surface with partial removal of cementum.

• 한국연초학회지
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• 제11권2호
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• pp.197-202
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• 1989

This experiment was conducted to investigate the effect of growth medium in pots composed of upland soil(S), rice straw manure(M), carbonated rice hull(CRH), and their mixture on growth of tobacco cv. NC 82. The growth of shoot and root was vigorous in order of medium S+M+CRH>M>CRH>S. In M+S medium, root growth in the part of manure was superior to upland soil. But root growth of upland soil part in M+S plot was more vigorous than that in upland soil only. It is possibly due to be influenced by manure in M+S plot. Total length and weight of root, number of roots, and especially for development of adventitious root were closely related to shoot growth. Roots grown in upland soil part was brownish gray in color, while the roots in manure part was milky white. The milky white colored roots had longer life than others. It was concluded that root zone environments derived from several media in pots closely related to shoot growth and disease tolerance of tobacco plant.

• 한국약용작물학회지
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• 제27권4호
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• pp.284-291
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• 2019

Background: Ginseng root rot disease, caused by Cylindrocarpon destructans and Fusarium solani is a major cause of replant failure in continuous cropping ginseng. Methods and Results: To control replant injury in soil infected with C. destructans and F. solani, biosolarization was performed by covering the plot with transparent polyethylene film after adding green manure of maize and sunflower for the summer season. Per 10 a, fresh and dry weight of maize was 10.1 and 2.5 tons, respectively, and that of sunflower was 8.1 tons and 1.2 tons, respectively. Mean maximum temperature at 20 cm depth was $33.2^{\circ}C$, $41.5^{\circ}C$ and $41.8^{\circ}C$ in the control, maize-incorporated and sunflower-incorporated plots, respectively. The elapsed time over $40^{\circ}C$ was 36.4 h in the maize-incorporated plot and 77.3 h in the sunflower-incorporated plot. Biosolarization increased $NO_3$ content in soil, while content of organic matter, Ca, and Mg was decreased. Electrical conductivity, $NO_3$ and $P_2O_5$ in soil significantly increased after two years of biosolarization. The number of spores of C. destructans in soil was significantly decreased by biosolarization, and sunflower treatment was more effective than maize treatment in decreasing the number of spores. Root yield of 3-year-old ginseng was significantly increased by biosolarization, however, there was no significant difference between maize and sunflower treatments. Rate of root rot in 3-year-old ginseng decreased to 16.5% with the incorporation maize and 5.0% with the incorporation of sunflower, while that in control 25.6%. Conclusions: Biosolarization was effective in inhibiting ginseng root rot by decreasing the density of root rot disease and improving soil chemical properties.

• Imaging Science in Dentistry
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• 제43권3호
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• pp.171-177
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• 2013

Purpose: The purpose of this study was to compare the efficacy of two imaging modes in a cone beam computed tomography (CBCT) system in detecting root fracture in endodontically-treated teeth with fiber posts or screw posts by selecting two fields of view. Materials and Methods: In this study, 78 endodontically-treated single canal premolars were included. A post space was created in all of them. Then the teeth were randomly set in one of 6 artificial dental arches. In 39 of the 78 teeth set in the 6 dental arches, a root fracture was intentionally created. Next, a fiber post and a screw post were cemented into 26 teeth having equal the root fractures. High resolution (HiRes) and standard zoom images were provided by a CBCT device. Upon considering the reconstructed images, two observers in agreement with each other confirmed the presence or absence of root fracture. A McNemar test was used for comparing the results of the two modes. Results: The frequency of making a correct diagnosis using the HiRes zoom imaging mode was 71.8% and in standard zoom was 59%. The overall sensitivity and specificity in diagnosing root fracture in the HiRes mode were 71.79% and 46.15% and in the standard zoom modes were 58.97% and 33.33%, respectively. Conclusion: There were no significant differences between the diagnostic values of the two imaging modes used in the diagnosis of root fracture or in the presence of root canal restorations. In both modes, the most true-positive results were reported in the post space group.

• 한국균학회지
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• 제25권1호통권80호
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• pp.6-9
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• 1997

1993년 5월, 국내 여주지역의 비닐하우스포장에서 가지점뿌리썩음병이 처음 발견되었다. 이 병의 병원 진균은 형태적 및 배양적 특성에 의해 Colletotrichum coccodes (Wallr.) Mushes로 동정되었다. 이 균의 균주들을 사용하여 병원성검정을 실시한 결과, 병원성이 확인되었다.

• 식물병연구
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• 제14권1호
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• pp.76-78
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• 2008

포항지역의 부추 연작 장해를 조사하는 중 부추에서는 처음으로 뿌리혹선충의 기생이 발견하여 보고한다. 부추에 기생하는 뿌리혹선충은 Meloidogyne incognita로 동정되었다. 연작 장해지에는 뿌리혹선충, 뿌리응애(Rhizoglyphus sp.), 시들음병(Fusarium oxysporum f. sp. cepae)등이 복합적으로 발생되고 있었지만 발생 빈도와 피해 정도를 보아 연작장해의 주요 원인은 뿌리혹선충이었다.

• Journal of Ginseng Research
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• 제22권4호
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• pp.237-243
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• 1998

Three fungicides, Orbit (propiconazole), Benlate (benomyl) and ASC-66835 (fluazinam), were tested as soil drenches to control disappearing root rot (DRR) of ginseng (Panax quinquefolius) in gardens artificially infested with Cylindrocarpon dsstrutans. The incidence of DRR was low (0∼3.5%) in uninfected plots and significantly higher in infested plots (2.6∼19.9%). Significant reductions in the incidence of DRR were observed in 1-year-old and 2-year-old gardens that were treated and assessed for disease in the same year Significant control was not obtained in 3-year-old gardens treated and as secede in the same year, or in 1-year-old or 2-year-old gardens assessed in the year following information. Disease incidence was significantly reduced by 49-77% by low and high rates of benomyl (45 and 1,250 mg a.1./L) and propiconazole (10 and 40 mg a.i./L) and by fluazinam at 150 mg a.i./L. These fungicides seem to be worthy of further investigation as soil drenches to control DRR of ginseng.