• Journal of Periodontal and Implant Science
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• v.25 no.2
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• pp.372-385
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• 1995

본 연구의 목적은 비외과적 치주치료시 부가적으로 사용하기 위해 실험적으로 개발한 젤 형태의 테트라사이클린 및 테트라사이클린-구연산 혼합젤의 치근면에 대한 시간에 따른 활성도를 측정하고, 이를 용액 형태의 테트라사이클린 제제 또는 클로르헥시딘 들과 비교하는 것이다. 6명의 환자로 부터 18개의 발치된 치아를 실험대상으로 하였으며, 치아는 발치한 즉시 치석제거술과 치근활택술을 시행한 후 각 각 4개씩 4군으로 나누어 다옴과 같은 처치롤 하였다 ; 1) O.1% 클로르핵시딘 용액에 5분간 침전; 2) 50mg/ml의 테트라사이클린 용액에 5분간 침전; 3) 5% 테트라사이클린 젤에 5 분간 처리 ; 4) 테트라사이클린-구연산 혼합첼로 5 분간 처치; 5) 그리고 2개의 치아는 대조군으로서 멸균된 생리식염수에 5분간 처리하였다. 침전후 치아는 1ml의 tris-buffered saline이 담긴 용기에 옮겨 24시간 간격으로 탈착된 TBS용액올 교체하면서 실온에서 22일간 보관하였다. Porphyromonas gingivalis를 indicator organism으로 하여 microtiter assay를 이용하여 홉광도를 측정 함으로써 제거 된 용액 의 항 미생물 활성올 측정하였다. 1. 50mg/ml 의 테트라사이클린 수용액에 침전되었던 군은 생리식염수로 처리한 군에 비하여 17 일간 클로르헥시딘으로 처리한 군에 비하여는 16일간 항미생물 활성에 있어서 유의성 있는 차이를 보였다. 2. 테트라사이클린 젤과 테트라사이클린-구연산 혼합첼로 처리한 군은 대조군에 비하여 각 각 4일과 3일 까지 활성올 보였다. 3. 0.1% 클로르핵시딘 용액으로 처리한 군은 생리식염수로 처치한 군에 비하여 24시간 밖에 활성을 나타내지 못했다. 4. 전반척으로 테트라사이클린-구연산 혼합첼로 처리한 군에 비하여 테트라사이클린 첼로 처리한 군의 활성이 높았으나 유의성 있는 차이롤 보이지는 않았다.

• The korean journal of orthodontics
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• v.40 no.3
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• pp.195-206
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• 2010

The aim of this report is to present an intraoral upper molar distalization system supported with zygomatic anchorage plates (Zygoma-gear Appliance, ZGA). This system was used for a 16-year-old female patient with a Class II molar relationship requiring molar distalization. The system consisted of bilateral zygomatic anchorage plates, an inner-bow and heavy intraoral elastics. Distalization of the upper molars was achieved in 3 months and the treatment results were evaluated from lateral cephalometric radiographs. According to the results of the cephalometric analysis, the maxillary first molars showed a distalization of 4 mm, associated with a distal axial inclination of $4.5^{\circ}$. The results of this study show that an effective upper molar distalization without anchorage loss can be achieved in a short time using the ZGA. We suggest that this new system may be used in cases requiring molar distalization in place of extraoral appliances.

• The korean journal of orthodontics
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• v.26 no.1 s.54
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• pp.17-32
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• 1996

It is important to understand the operating mechanism and force system of fixed appliance that most effective for individual tooth movement in various orthodontic appliances. The archwire system of fixed appliance is devided into 3 types, which is continuous arch, segmented arch and sectional arch. The last two types have longer interbracket distance and simple force operating points, so it is easy to control force system by operator. But the continuous arch has shorter interbracket distance and various bracket geometry, so it is hard to control and anaylze the force system. The purpose of this study was three dimentional force and moment analysis of continuous arch system by finite element method, which is similar situation to three dimentional elastic beam in structural engineering. Several sample form of various bracket geometry and artificial lower crowding typodont made by author were constructed, analyzed and compared each other. The results were as follows : 1. The force magnitude is linear proportional to the degree of displacement or tilting of the bracket. 2. The force magnitude is inversely non-linear proportional to the interbracket distance. 3. In three dimensional typodont model, while the force can be compared with that of the sample form in the area where adjacent bracket geometry is simple, the force is much more than the expected value in the area where adjacent bracket geometry is complex.

• Journal of the korean academy of Pediatric Dentistry
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• v.38 no.1
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• pp.82-87
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• 2011

The pulp infection of primary tooth is often caused by dental caries or trauma. But, if it is not managed properly, it can be produce the periapical lesion. The periapical lesion can cause some complications such as enamel hypoplasia, displacement, root dilaceration and impaction. Treatment options of displaced permanent successor are clinical and radiological follow-up after extraction of primary teeth, surgical opening, orthodontic traction, transplantation and extraction. In these cases, the premolars with abnormal eruption path caused by periapical lesion of the primary tooth have shown successful spontaneous eruption just as a result of extraction of infected primary tooth and space maintenance.

• Journal of Yeungnam Medical Science
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• v.23 no.1
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• pp.71-81
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• 2006

Background: This study was done to better understand patterns, trends and local distribution patterns of malocclusion so that we can provide adequate information to patients, to help make the appropriate diagnosis and therapeutic plans, and to assess the future directions of malocclusion treatment. Materials and Methods: Malocclusion patterns, distribution and trends of visiting patients were examined in 993 malocclusion patients who had been evaluated and diagnosed at the Department of Dentistry, Yeungnam University Hospital over a 10-year period from 1995 to 2004. Results: The number of visiting patients per year showed an increasing trend and the visit rate was 1.28 time-higher in females(56.1%) than in males(43.9%). 1) Age distribution showed that the 7-12 year-old group was the largest (36.7%). Geographic distribution showed the majority of patients were from the Dalseo district(28.2%). Angle's malocclusion classification revealed that class III was the largest(38.4%). Crowding was the chief complaint in the highest percentage of patients(33.9%). The therapeutic method used was the fixed appliance in 61% of cases and a combination with extraction in 30.8%. Conclusions: The availability of dental services can accommodate orthodontic needs adequately as well as obtain reliable quantitative information regarding the characteristics of orthodontic patients.

• Journal of the korean academy of Pediatric Dentistry
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• v.43 no.2
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• pp.145-150
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• 2016

Special Health Care Needs (SHCN) patients need regular follow-up because of high incidence and severity of oral disease. The aim of this study was to evaluate the dental treatment outcomes of SHCN patients according to follow-up patterns. SHCN patients who were treated under general anesthesia (GA) at Kyung Hee University Dental Hospital from 2006 to 2014 were included in this study. The final samples comprised of 53 patients that were divided into regular (33 patients) and irregular (20 patients) follow-up groups according to their follow-up patterns. The type of dental treatment after GA during the follow-up periods were compared. In the irregular group, aggressive treatment including endodontic, prosthetic treatment, and extraction were predominant, compared with the regular group (p < 0.05). In addition, all patients who had dental treatment under GA in follow-up periods were in the irregular group (p < 0.05). In conclusion, the results of this study provide the importance of regular follow-ups with SHCN patients and emphasize responsibilities of dentists for educating patients and their guardians.

• The Journal of Korean Academy of Prosthodontics
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• v.59 no.4
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• pp.415-421
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• 2021

The biomechanical prognosis of conventional removable partial denture is questionable in case of patient with few remaining teeth or periodontally compromised teeth. In this case, hybrid telescopic double crown RPD may be a successful treatment alternative. Hybrid telescopic double crown RPD has following advantages over conventional RPD: secondary splinting effect between abutments, more vertical stress direction and more convenient in repairing the denture after extraction of abutment tooth. In this clinical case, patient had deep overbite in anteriors and partially edentulous. The maxilla was restored with hybrid telescopic double crown RPD and the mandible was restored with implants and fixed prostheses. Long-term follow-up and supportive periodontal treatment were performed, and satisfactory results were achieved in terms of function and aesthetics.

• The korean journal of orthodontics
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• v.36 no.5
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• pp.369-379
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• 2006

Objective: The purpose of this study was to find changes in the occlusal plane related to different vertical facial patterns and suggest treatment goals and conduct possible treatment mechanisms. Methods: 60 adult patients (28 males, 32 females) who had been diagnosed as Class 1 skeletal malocclusion and treated without extraction were selected. Patients were divided into three groups; short face type (group 1), average face type (group 2) and long face type (group 3), using the data on normal occlusion of Korean adults. Results: The results were achieved by analyzing cephalometric tracings of each group at pre-treatment, end-treatment and post-treatment (about 1 year recall check). The inclination of the occlusion plane tends to gradually increase as the face becomes longer In group 1, COP-X, FOP-X, L6/L1, MP-L6 were significantly decreased, and L1-FOP was significantly increased during the retention period (T3-T2). Group 2 showed no significant change, In group 3, FOP-X was significantly increased during the retention period (T3-T2). During the retention period, FOP-X showed significant change among each group, especially between group 1 and group 3. Conclusion: These results suggest that changes of occlusal plane inclination according to facial vertical pattern need to be considered during the retention period for intrusion, extrusion, and incisor overbite.

• The korean journal of orthodontics
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• v.33 no.1 s.96
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• pp.1-9
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• 2003

The purpose of this study was to find out and evaluate discrepancies between preorthodontic prediction values and actual postorthodontic values and factors contributing to it in 45 patients(17 male, 28 female) who were diagnosed as skeletal Class III ma)occlusion and received presurgical orthodontic treatment and orthognathic surgery at Yonsei university dental hospital. Lateral cephalograms were analysed at pretreatment(T1), orthodontic Prediction(T2), immediately before surgery(T3) and designated the landmark as coordinates or X and Y axes. The samples were divided according to ALD, upper and lower incisor inclination(Ul to SN, IMPA), COS, extraction, the position of extracted teeth and the statistical significance was tested to find out the factors contributing to the prediction. The results were as follows: 1. Differences between preorthodontic prediction values and actual postorthodontic values(T2-T3) were statistically significant(p<0.05) in the x coordinates of U6mbc, L1x and in y coordinates of U1i, U1x, U6me, U6mbc, L6mbc 2. The accuracy of prediction is relatively higher in horizontal changes compared to vortical changes. 3. The statistical significance(p<0.05) between prediction and actual values is observed more in the landmarks of the maxilla than the mandible. 4. Differences between prediction and actual values of incisor and first molar were statistically significant(p<0.05) according to extraction vs non-extraction, extraction type, ALD in the maxilla and according to ALD, IMPA in the mandible. Discrepancies between preorthodontic prediction values and actual postorthodontic values and factors contributing to the prediction must be considered in treatment planning of Cl III surgical patients to increase the accuracy of prediction. Furthermore future investigations are needed on the prediction of vortical changes.

• The Journal of Korean Academy of Prosthodontics
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• v.53 no.1
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• pp.74-80
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• 2015

When oral cancer is occured, one may experience problems such as lip defect, necrosis of periodontal tissue and cervical caries caused by radiotherapy. According to ADI (Association of dental implantology), recent radiotherapy on jaw bone could be a relative contraindication of implant treatment. Due to this controversy, in most cases, treatment is done with removable dentures rather than implants. Especially, lip defect caused by an oral cancer operation have a serious repercussion on the retention of the denture. In this case report, patient with upper lip cancer had undergone resection primarily and secondary radiotherapy was done periodically. As a result, upper teeth of patient were extracted gradually and lower teeth showed very poor periodontal status. Therefore, Polident$^{(R)}$ denture adhesive cream (GlaxoSmithKline, London, England) was applied on maxillary complete denture to overcome reduced retention due to the lip defect and double crown RPD with friction pin was applied on the mandible successfully for two years.