• 대한치과교정학회지
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• 제46권5호
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• pp.290-300
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• 2016

Objective: This study aimed to (1) evaluate the effects of maxillary second and third molar eruption status on the distalization of first molars with a modified palatal anchorage plate (MPAP), and (2) compare the results to the outcomes of the use of a pendulum and that of a headgear using three-dimensional finite element analysis. Methods: Three eruption stages were established: an erupting second molar at the cervical one-third of the first molar root (Stage 1), a fully erupted second molar (Stage 2), and an erupting third molar at the cervical one-third of the second molar root (Stage 3). Retraction forces were applied via three anchorage appliance models: an MPAP with bracket and archwire, a bone-anchored pendulum appliance, and cervical-pull headgear. Results: An MPAP showed greater root movement of the first molar than crown movement, and this was more noticeable in Stages 2 and 3. With the other devices, the first molar showed distal tipping. Transversely, the first molar had mesial-out rotation with headgear and mesial-in rotation with the other devices. Vertically, the first molar was intruded with an MPAP, and extruded with the other appliances. Conclusions: The second molar eruption stage had an effect on molar distalization, but the third molar follicle had no effect. The application of an MPAP may be an effective treatment option for maxillary molar distalization.

• Journal of Periodontal and Implant Science
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• 제48권1호
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• pp.22-33
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• 2018

Purpose: The purpose of this study was to evaluate the efficacy of the modified plaque score (MPS) for assessing the oral hygiene status of periodontitis patients. Methods: A total of 116 patients were included in this study. After evaluation of the $L{\ddot{o}}e$ and Silness gingival index (GI), Silness and $L{\ddot{o}}e$ plaque index (PlI), O'Leary plaque control record (PCR), and MPS, patients were randomly assigned to either a conventional tooth brushing instruction (C-TBI) group (n=56) or a professional intraoral tooth brushing instruction (P-TBI) group (n=60). The MPS and clinical parameters were re-evaluated after scaling and a series of root planing. The convergent validity of MPS with the PlI and PCR was assessed. The measurement time for MPS and PCR was compared according to the proficiency of the examiner. Results: After root planing, the GI, PlI, PCR, and MPS improved from their respective baseline values in both groups. Three different plaque indices including the MPS, showed significant differences between the C-TBI group and the P-TBI group after root planing. The MPS showed significant concurrence with the PCR and PlI. The mean time for PCR measurement was $2.76{\pm}0.71$ times longer than that for MPS measurement after 2 weeks of training. Conclusions: MPS seems to be a practical plaque scoring system compared with the PlI and PCR. These findings suggest that repetitive plaque control combined with an easily applicable plaque index (MPS) may facilitate more effective oral hygiene education and improved periodontal health.

• 대한소아치과학회지
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• 제30권4호
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• pp.715-721
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• 2003

상악 영구전치의 외상은 소아와 청소년기에 많이 일어난다. 그 중 치관의 파절은 18세 이하의 외상성 손상의 1/4에서 나타난다. 이러한 치관파절시 심미적 기능적으로 만족시킬 수 있는 수복을 하려는 노력이 계속되어 왔다. 파절편을 이용한 수복은 이러한 심미적 기능적인 조건을 만족시킬 수 있는 방법이다. 본 증례들은 전남대학교병원 소아치과에 상악중절치의 외상을 주소로 내원한 아동들의 치험례이다. 증례 1은 미성숙영구치치근을 가지는 만 7세의 여아로 침상출혈에 따른 수산화칼슘을 이용한 직접치수복조후 파절편을 부착한 증례이며, 증례 2는 함입과 치관파절로 인해 치수노출을 보인 만 10세 남아로 resin-wire splint 후 치수치료 하고 파절편을 부착하였고, 증례 3은 파절선이 생리적 폭경을 침범한 8세 여아로 별다른 처치 없이 파절편 부착을 시행하였다. 이상의 증례들을 통하여 치아 파절편 부착을 성공적으로 시행하였으며, 심미적으로 양호한 결과를 얻었다.

• 대한소아치과학회지
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• 제29권3호
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• pp.418-422
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• 2002

낭종이란 액체 또는 반유동액 물질을 함유하는 병적인 상피로 둘러싸인 공동을 말하며 악골에 발생하는 치성 낭종은 치배, 치관의 잔존 법랑상피, Malassez의 상피잔사 및 구강상피의 기저세포층에서 기원한 낭종을 말한다. 이러한 낭종 발생시 적출술, 조대술, 감압술 및 외과적 절제술의 방법으로 치료가능하며 이는 낭종의 특성, 크기, 주변조직과의 관계, 환자의 나이와 성별 및 협조도와 전암 여부 등을 고려하여 선택하게 된다. 본 증례는 미성숙 영구치가 매복되어 치성 낭종이 발생한 환아에서 감압술을 이용하여 낭종이 제거되고 골조직으로 치유되었으며 매복되었던 영구치가 맹출하였고 낭종이 재발되지 않아 양호한 결과를 얻어 이에 보고하는 바이다.

• 의학교육논단
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• 제14권1호
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• pp.37-49
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• 2012

The main purpose of this study is to examine the improvement and discourse of the medical education system in Korea since 1990. In particular, this study, focusing on the graduate medical education system initiated in 2002, has explored the discussions that led to the system's establishment and what the context of those discussions. To meet this objective, this study analyzed research report related to the medical education system authored by members of the government and medical community, suggestions to the government, discussion materials, and data with regard to the Medical (Dental) Education Eligibility Test. The improvement of the medical education system in Korea has been an important issue in education reform by the expansion of the number of years of higher education, the requirements for increased levels of professional knowledge by improving public educational standards, and the basic formation policy of higher education consisting of graduate school, special graduate school, and professional graduate school. Nevertheless, the views of the government and the medical community on improving medical education system have made an obvious difference. This was due to different aims about how to improve the medical education system and different perception of the degree and medical education system. The medical community at least tended to prefer the status of academic positions over professional positions. The policy of medical education for people with a bachelor's degree which was introduced in 2002 spread to many colleges of medicine based on the government's administrative and financial support policy. Even so, the absence of accompanying policy by the relevant government agencies and department of education, which could have ensured the success of the system, has led to continued debate. In conclusion, without a consistent and persistent government policy, the graduate medical education system has led to confusion in many medical institutions. Above all, an evidence-based policy decision and policy approach based on a long-term perspective are necessary in order to improve the medical education system.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제29권1호
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• pp.35-42
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• 2003

Purpose: This study was aimed to investigate the relationship between the mandibular asymmetry and the internal derangement of temporomandibular joint. Materials and methods: One hundred and sixty eight patients had been assessed through clinical examinations, panoramic radiographs and magnetic resonance imagings (MRIs), were selected. The samples were classified into three subgroups according to the severity of the mandibular asymmetries in the panoramic radiographs and the status of TMJ discs on the MRI were compared among each groups. Results: In an apparent asymmetry group, there was a significant difference in the number of temporomandibular disk displacement without reduction between the long and short side (66.7%, 18/27 joints on the short side) when the ratio of condylar process and coronoid process was used (p<0.05), but there was no statistically significant difference when the ratio of condyle and ramus was used. Conclusion: The probability of the disc displacement without reduction was higher at the side with relatively shorter condylar process on the panoramic radiograph, and also it might be more effective to use ratio of condylar process and coronoid process in the assessment of mandibular asymmetry. Therefore, a careful assessment on the temporomandibular disorders is necessary to diagnose and establish the treatment plans for the patients with a mandibular asymmetry and the panoramic radiograph can be used effectively on that way.

• 대한구순구개열학회지
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• 제4권2호
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• pp.1-8
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• 2001

The dissimilarities between South and North Korea have persisted in spite of the reconciliation campaign by both countries. The situation of the cleft lip & palate of North Korea was very unclear until now. The purpose of this study is to understand all the current facts of cleft lip & palate in North Korea so that we can find ways of helping North Korea in this field of medicine. The present data and analysis are extracted from North Korean textbooks. The results are as follow. 1. In North Korea, patients with CLP are treated by oral surgeons or maxillofacial surgeons. The detailed contents about the CLP are well described in the North Korean textbooks for the dental students. 2. The terminology of CLP in North Korea has changed from time to time, but the present terminology not being so different from South Korean counterpart. So there will be no particular problems in mutual communication. 3. The main classification for CLP in North Korea originated from Kernahan & Stark's classification as is with South Korea. 4. The incidence of CLP is 1 : 1,000-1,200 in North Korea, which is lower than that of South Korea. There is, however, some difference between the North and South Korean CLP in detailed statistics. 5. We found the North Korean physicians have shown much interest in pursuing the etiology and the prevention of CLP. 6. The timing of CLP operations varied a lot in North Korea. There was recommendation by few for the operation in much late age than in South Korea. 7. The classical operation techniques of cleft lip have changed. For unilateral cleft lip Tennison-Randall method was replaced by Millard I method: and for bilateral cleft lip LeMesurier method was replaced by Veau III and Tennison methods. But for cleft palate Pushback palatoplasty has been utilized consistently.

• Journal of Periodontal and Implant Science
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• 제46권1호
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• pp.10-21
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• 2016

Purpose: This study evaluated the predictive performance of a combination of self-report questionnaires, salivary hemoglobin levels, and age as a non-invasive screening method for periodontitis. Methods: The periodontitis status of 202 adults was examined using salivary hemoglobin levels, responses to 10 questions on a self-report questionnaire, and the Community Periodontal Index (CPI). The ability of those two variables and the combination thereof with age to predict the presence of CPI scores of 3-4 and 4 was assessed using logistic regression and receiver operating characteristic (ROC) curve analysis. Results: CPI scores of 3-4 and 4 were present among 79.7% and 46.5% of the sample, respectively. The area under the ROC curves (AUROCs) of salivary hemoglobin levels for predicting prevalence of CPI scores of 3-4 and 4 were 0.63 and 0.67, respectively (with sensitivity values of 71% and 60% and specificity values of 56% and 72%, respectively). Two distinct sets of five questions were associated with CPI scores of 3-4 and 4, with AUROCs of 0.73 and 0.71, sensitivity values of 76% and 66%, and specificity values of 63% and 69%. The combined model incorporating both variables and age showed the best predictive performance, with AUROCs of 0.78 and 0.76, sensitivity values of 71% and 65%, and specificity values of 68% and 77% for CPI scores of 3-4 and 4, respectively. Conclusions: The combination of salivary hemoglobin levels and self-report questionnaires was shown to be a valuable screening method for detecting periodontitis.

• Molecules and Cells
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• 제40권8호
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• pp.558-566
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• 2017

Regular monitoring on experimental animal management found the fluctuation of ART outcome, which showed a necessity to explore whether superovulation treatment is responsible for such unexpected outcome. This study was subsequently conducted to examine whether superovulation treatment can preserve ultrastructural integrity and developmental competence of oocytes following oocyte activation and embryo culture. A randomized study using mouse model was designed and in vitro development (experiment 1), ultrastructural morphology (experiment 2) and functional integrity of the oocytes (experiment 3) retrieved after PMSG/hCG injection (superovulation group) or not (natural ovulation; control group) were evaluated. In experiment 1, more oocytes were retrieved following superovulation than following natural ovulation, but natural ovulation yielded higher (p < 0.0563) maturation rate than superovulation. The capacity of mature oocytes to form pronucleus and to develop into blastocysts in vitro was similar. In experiment 2, a notable (p < 0.0186) increase in mitochondrial deformity, characterized by the formation of vacuolated mitochondria, was detected in the superovulation group. Multivesicular body formation was also increased, whereas early endosome formation was significantly decreased. No obvious changes in other microorganelles, however, were detected, which included the formation and distribution of mitochondria, cortical granules, microvilli, and smooth and rough endoplasmic reticulum. In experiment 3, significant decreases in mitochondrial activity, ATP production and dextran uptake were detected in the superovulation group. In conclusion, superovulation treatment may change both maturational status and functional and ultrastuctural integrity of oocytes. Superovulation effect on preimplantation development can be discussed.

• 한국산학기술학회논문지
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• 제15권5호
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• pp.3051-3057
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• 2014

본 연구는 객관적인 국가차원의 국민건강영양조사 제5기 원시자료를 활용하여 영양조사의 영양소 섭취량과 구강검진 조사의 항목으로 실시된 영구치우식유병자여부, 우식경험영구치수, 영구치우식경험여부 등의 3가지 항목에 대한 상관관계를 조사하였다. 지방과 리보플라빈 섭취량이 많을수록 우식경험영구치수는 감소하는 것으로 나타났고, 조섬유 섭취량과 나이아신 섭취량이 많을수록 우식경험영구치수는 증가하였다. 또한 영구치우식경험여부와의 영향력 관계에서 식품섭취량이 증가할수록 영구치우식경험여부가 증가하였고, 조섬유, 나트륨, 칼륨, 나이아신 영양소의 섭취량이 증가할수록 치아우식경험이 증가하였다. 이에 반해 수분, 지방, 인, 리보플라빈 영양소의 섭취량이 증가할수록 영구치우식경험율은 감소하는 것으로 나타났다.