• The Journal of the Korean dental association
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• v.25 no.11 s.222
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• pp.1061-1068
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• 1987

• The Journal of the Korean dental association
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• v.26 no.11 s.234
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• pp.1008-1012
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• 1988

구강점막에 발생하는 종양성 병변으로는 대표적으로 구강점막암(oral mucous membrane cancer), 유두종(papilloma),혈관종(hemangioma), 임파관종(lymphangioma),섬유종(fibroma)등이 있는데 이들 병변들은 구강내 협점막, 치은, 경구개, 연구개, 구강저, 혀 등에 궤양이나 증식성 병소로 나타나서 동통, 출혈, 치아동요, 종창 등의 증상을 유발시킨다. 이러한 병변들에 대한 명확한 치료와 예후를 결정하기 위해서는 무엇보다도 이들 병변들에 대한 정확한 소견에 근거한 진단이 우선되어야 할 것이다. 따라서 본 장에서는 정확한 진단과 치료를 위해 이들 병변들에 대해 소개하고자 한다.

• Journal of the korean academy of Pediatric Dentistry
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• v.39 no.1
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• pp.79-83
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• 2012

Burkitt's lymphoma is a malignant tumor originated from B lymphocyte and a type of non-hodgkin lymphoma. It is clinically classified by endemic, sporadic and immune deficient forms. In the past, it had poor prognosis but in recent years survival rate is 50~80% treated by intensive chemotherapeutic regimens. Mostly it is a lesion of the jaws. Clinical symptoms are severe tooth mobility, displacement, gingival redness and swelling. This case is about a patient with aggressively progressing Burkitt's lymphoma of the jaws. Initial diagnosis was done in dental hospital and it has shown satisfactory outcome by prompt and appropriate treatment.

• The Journal of the Korean dental association
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• v.38 no.11 s.378
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• pp.994-996
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• 2000

• The Journal of the Korean dental association
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• v.13 no.4
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• pp.313-317
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• 1975

• Journal of the korean academy of Pediatric Dentistry
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• v.29 no.4
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• pp.618-624
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• 2002

Effect of the roasted barley tea in commercial markets on the adherence to the saliva-coated hydroxyapatite(HA) beads and the cell surface hydrophobicity of Streptococcus mutans and Streptococcus sobrinus as cariogenic microorganism was examined in vitro. Adherence activity and hydrophobicity in bacteria tested in all the barley tea samples decreased and the values were different according to the type of tea and the type of treatment. The inhibition of bacterial adsorption to HA beads suggest that barley tea active molecules as catechins and melanoidins may adsorb to a host surface, preventing the tooth receptor from interacting with any bacterial adhesions. The obtained results showed that the barley tea may inhibit bacterial adherence, the first step of the pathogenesis of dental caries in which these microorganism are involved.

• Journal of the korean academy of Pediatric Dentistry
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• v.31 no.3
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• pp.439-447
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• 2004

The aim of this study is to survey the frequency of mutans streptococci species and biotypes isolated from dental plaque in Korean children and the relationship between species and biotypes of mutans streptococci and dft index. Dental plaques were collected from the anterior and molar teeth of upper and lower jaws in the subjects, aged below 12 years old. A dental examination was performed for dft (decayed, filled, total) with the WHO caries diagnostic criteria. The mutans streptococci from the sample were cultured selectively on mitis salivarius-bacitracine (MSB) agar plate. For biotyping of mutans streptococci, biochemical test was performed. From the culture, bacterial genomic DNA was prepared for using of PCR template for the identification of mutans streptococci at the species-level. Forty strains of mutans streptococci were isolated from dental plagues of 40 patients. The biotype I (45%) and biotype IV (32.5%) were most frequently detected. The prevalence of S. mutans and S. sobrinus was 69% and 31%, respectively. There was no positive relationship between species and biotypes of mutans streptococci and dft index. Our results revealed that biotype I and S. mutans were frequently detected in Korean children and support that dental caries incidents by many causative factors not only bacterial factor.

• Journal of Korean Academy of Oral and Maxillofacial Radiology
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• v.24 no.2
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• pp.317-326
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• 1994

Panoramic radiographs of a dry skull were used to evaluate the accuracy of four panoramic dental X-ray systems in determining tooth angulations in the buccal segments. The four machines evaluated were the Philips Oralix Pan DC, the GE panelipse, the SS White panorex 1, and the SS White Panorex 2. Panoramic radiographs were taken at six different patient positions for each machine to evaluate the effects of patient positioning on determining tooth angulations in the buccal segments. All of the machines studied showed a significant correlation between the mean radiographic estimates and the actual measurements regardless of positioning(p<0.05). With correct placement of the skull, the results were analyzed for an error tolerance of +/-3/sup 0/ between the actual measurements and the radiographic estimates for tooth angulation. The SS White Panorex 1 was accurate 74% of the time, the GE Panelipse was accurate 67% of the time, the Philips Oralix Pan DC and the SS White Panorex 2 were accurate 64% of the time. When an error tolerance of +/-5/sup 0/ was permitted, the accuracy was 89% for the SS White Panorex 1 and the GE Panelipse, 85% for the Philips Oralix Pan DC, and 81% for the SS White Panorex 2.

• Journal of the korean academy of Pediatric Dentistry
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• v.31 no.4
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• pp.617-623
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• 2004

Acidic drink has been known as a cause of tooth erosion. The purpose of this study is to verify the acid levels of orange juices in market and evaluate the erosion effects on the enamel of deciduous teeth by orange juices in relatively short period of time. With four kinds of orange juice selected from market, pH, buffering capacity and concentration of Ca and P ion were measured. And forty segments of normal enamel of deciduous incisors were divided into four groups and level of erosion was measured by surface hardness test before and after soaking at 50ml of orange juice for 10 minutes. The results of this study showed that the average pH of orange juices was 4.0 and this pH value was so acidic as to cause the tooth erosion. There were differences in small quantity for each group of teeth, however, the result was statistically so significant that orange juices can cause enamel erosion in relatively short period of time.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.41 no.2
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• pp.61-68
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• 2004

Electric stimulation of teeth has been used for assessing pulp vitality. The principle is based upon the assumption that a subject feels the pain produced by electrical current stimulation of intradental nerve. Because of very high and wide range of impedance of the enamel, it is very difficult to determine stimulation levels regardless of teeth status. Most pulp testers adopt voltage stimulation method and thus, their stimulating threshold levels significantly depend on each individual. Therefore, a constant current stimulator is necessary to minimize the effect of wide variation due to different enamel thickness. And it is also necessary to test teeth vitality with a wide current range regardless of tooth impedance. In this study, we constructed a burst-wave type pulp tester to reduce the pain using a current stabilizing circuit with the maximum current of 150 uA.