• 대한치과교정학회지
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• 제29권1호
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• pp.129-136
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• 1999

유착, 부적절한 교정치료, 과잉치, 낭종, 비정상적인 맹출경로등의 국소적인 원인으로 인하여 구치부의 매복이 발생할 수가 있다. 매복치는 적절한 치료를 하지 않으면, 교합기능의 상실, 영구치의 상실, 대합치의 정출, 인접치의 치근흡수등을 야기 할 수가 있다. 매복치를 성공적으로 맹출유도하기 위해서는 매복치의 치근형성여부가 중요한 요소가 되며, 매복치의 치근형태, 주위환경등을 유의한 적절한 교정력이 가해져야 한다.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2014년도 추계 종합학술대회 논문집
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• pp.411-412
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• 2014

The objective of this study was to evaluate relationships between the economic status and the oral health status. Data were obtained from the National Health Insurance Corporation database. The prevalence of dental caries and tooth loss were compared among the ten-percentile according to the level of the monthly income. The prevalence of dental caries and tooth loss were lower in the high level of monthly income than low level of monthly income group. There was a significant relationships between the economic status and the oral health status.

• 구강생물연구
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• 제42권4호
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• pp.248-253
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• 2018

Cemental tears are uncommon form of root fracture that can lead to rapid localized periodontal attachment loss. Studies have described periodontal breakdown as being associated with the separation of the cementum from the underlying tooth structure. The aim of this case report is to assess the outcome of treatment of cemental tear with several surgical treatment regimens. Three patients with cemental tear were treated with different surgical method. In all three cases, the cemental tear occurred on maxillary right central incisors. In each case, the root fragment were removed, the localized defect was treated using different surgical methods including guided tissue regeneration and bone graft followed by scaling and root planting. In all three cases, symptoms subsided after the treatment and clinical attachment level was improved up to 2 mm at 3 month after surgery. Both conventional and regenerative periodontal surgery could achieve successful outcomes.

• 대한치과교정학회지
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• 제48권2호
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• pp.125-130
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• 2018

Traumatic dental injury is considered a public dental health problem because of a high childhood incidence, high treatment costs, and prolonged treatment time. Although management guidelines for traumatized teeth have been outlined, tooth loss following trauma is occasionally unavoidable. Here, we describe the successful interdisciplinary management of a traumatized central incisor in an 11-year old boy that was extracted because of a poor prognosis and restored by the autotransplantation of an immature donor tooth into the site. The patient underwent orthodontic treatment in order to close the donor site space and bring the autotransplanted tooth to an ideal position. Postorthodontic treatment radiographs and photographs revealed an esthetic and functional natural tooth replacing the lost tooth. The findings from this case suggest that autotransplantation offers unique advantages as a treatment modality for the restoration of missing teeth, particularly in growing children.

• 대한치과보철학회지
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• 제34권4호
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• pp.780-790
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• 1996

The endodontically treated tooth is generally restored with post and core, owing to the brittleness and the loss of large amount of tooth structure. Although there have been lots of studies about the endodontically treated teeth, the three-dimensional quantitative studies about the stress distribution of them are in rare cases. In this study, it was assumed that the coronal portion of the upper incisor had extensively damaged. After the root canal therapy it was post cored, and restored with PFG crown. The three-dimensional model, in which the root was supported with a normal alveolar bone, was constructed. Force was applied to the centric stop point with the angle of 135 degrees to the long axis of the tooth. Force was assumed to be 250N as functional maximum bite force of upper central incisors. The results analyzed with three-dimensional finite element method were as follows : 1. Stress was concentrated on the middle portion of the labial side dentin and the apical portion of the dentin. 2. Stress in the post was more concentrated on the post apex. 3. The displacement of the post at the post-cement interface was almost symmetrical la-bio-lingually. 4. It assumed that restoring extensively damaged tooth with a post-core and PFG crown is an adequate method of restoration.

• Restorative Dentistry and Endodontics
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• 제37권2호
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• pp.114-118
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• 2012

인접면의 우식증으로 인해 인접면의 공간 소실과 후방치아의 근심 경사가 발생한 본 증례에서 치아의 보철 수복 전 교정용 링의 삽입과 임시 전장관의 수정을 통해 치간 공간의 획득과 치축의 개선을 시행할 수 있었다.

• 대한치과보철학회:학술대회논문집
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• 대한치과보철학회 1999년도 Asian Academy of Prosthodntics. Korean Academy of Prosthodontics
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• pp.76.2-77
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• 1999

• 대한치과보철학회지
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• 제38권3호
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• pp.336-347
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• 2000

Statement of problem. Luster loss in esthetic anterior ceromer restoration can occur and can be related with rough surface texture. Understanding durability of surface finishing methods like polishing and surface coating have critical importance. Purpose. This study evaluated the effect of tooth brushing and thermal cycling on surface luster of 3 ceromer systems (Artglass, Targis, Sculpture) treated with different surface finishing methods. Material and methods. Seventy-two samples were prepared: 12 for control group Z100, 12 for Artglass, 24 for Targis, and 24 for Sculpture. Half of the Targis and Sculpture were polished according to the manufacturer's recommendation. The rest of the samples were coated with staining and glazing solution for Targis and Sculpture, respectively. All specimens were subjected to 10,000 cycles between $5^{\circ}C\;and\;55^{\circ}C$ with 30 seconds dwell time. Tooth brushing abrasion tests were performed in a customized tooth brushing machine with 500g back and forth for 20,000 cycle. Luster comparisons were based on grading after direct observation, and light reflection area was measured with Image analysis software. Results. All materials showed an decrease in luster grade after thermal cycling and tooth brushing. The post-tooth brushing results revealed that the glazed Sculpture had greater mean luster grade than did any other groups. While, the stained Targis group showed greatest changes after tooth brushing (p < 0.05), polished Targis and Sculpture did not show significant changes. However, glazed Sculpture showed discretely fallen out glaze resin. Conclusion. From the results of this study, all of the ceromer specimens were much glossy than control composite group after tooth brushing. coatings used for Targis and Sculpture had not durability for long term use.

• 한국전자거래학회지
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• 제19권4호
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• pp.45-60
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• 2014

컴퓨터 단층 촬영(Computed Tomography)을 통해 만들어진 3차원의 데이터를 온라인상으로 치과 의료에 사용하게 되면서 정보의 왜곡이나 손실 없이 3차원의 해부학적 정보를 얻을 수 있고, 치아 이식술이나 교정을 하기 전에 안전하게 치료계획을 세울 수 있다. CT 데이터를 이용한 정확한 진단을 위해서는 개별 치아를 분할 할 수 있어야 한다. 그러나 CT 데이터 상에서 치아 영역과 그 주변 영역은 밝기의 차이가 크기 않기 때문에 개별 치아를 분할하는 작업은 쉽지 않다. 특히 치아의 뿌리 부분으로 갈수록 치아 주변에 턱 뼈가 위치하기 때문에 더욱 구별이 힘들다. 본 논문에서는 자동으로 개별 치아를 분리하는 기존의 SRG(Seeded Region Growing) 알고리즘에 레벨-셋 방법을 추가하여 치아 뿌리 부분까지 더 정확하게 분할하는 알고리즘을 제안한다. 제안한 방법은 기존의 방법과 비교한 결과 개별 치아의 종류에 따라 19.2%의 정확도 향상을 얻을 수 있다.

• Restorative Dentistry and Endodontics
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• 제19권1호
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• pp.231-254
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• 1994

Fracture of cusp, on posterior teeth, especially those carious or restored, is major cause of tooth loss. Inappropriate treatments, such as unnecessarily wide cavity preparations, increase the potential of further trauma and possible fracture of the remaining tooth structures. Fracture potential may be directly related to the stresses exerted upon the tooth during masticatory function. The purpose of this study is to evaluate the fracture resistance of tooth, restored with composite resin inlay. In this study, MOD inlay cavity prepared on maxillary first premolar and restored with composite resin inlay. Three dimensional finite element models with eight nodes isoparametric solid element, developed by serial grinding-photographing technique. These models have various occlusal isthmus and depth of cavity, 1/2, 1/3 and 1/4 of isthmus width and 0.7, 0.85 and 1.0 of depth of cavity. The magnitude of load was 474 N and 172 N as presented to maximal biting force and normal chewing force. These loads applied onto ridges of buccal and lingual cusp. These models analyzed with three dimensional finite element method. The results of this study were as follows : 1. There is no difference of displacement between width of occlusal isthmus and depth of cavity. 2. The stress concentrated at bucco-mesial comer, bucco-disal comer, pulpal line angle and the interface area between internal slopes of cusp and resin inlay. 3. The vector of stress direct to buccal and lingual side from center of cavity, to tooth surface going on to enamel. The magnitude of vector increase from occlusal surface to cervix. 4. The crack of tooth start interface area, between internal slop of buccal cusp and resin inlay. It progresses through buccopulpal line angle to cervix at buccomesial and buccodistal comer. 5. The influence with depth of cavity to fracture of tooth was more than width of isthmus. 6. It would be favorable to make the isthmus width narrower than a third of the intercuspal distance and depth of cavity is below 1 : 0.7.