• The Journal of Korean Academy of Prosthodontics
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• v.51 no.2
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• pp.119-124
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• 2013

Many of the patients with extensive abrasion need comprehensive restorative treatment. The abrasion is usually caused by attrition, besides of it, there are many reasons for it. The plan of treatment should be started on assessment of the type of attrition and the etiologic analysis. Patient with well-developed masticatory muscle, alveolar process, and high occlusal force and also with little muscle length difference between the stable and the contracted state should be carefully assessed for the vertical dimensional loss and the restoration should be carefully designed. Decrease of tooth length can be compensated by the growth of the alveolar bone height; therefore, consistency of the occlusal vertical dimension is maintained. Accordingly, a careless increase of the vertical dimension can produce muscle fatigue, depressed tooth and pain, and fracture of the restoration. In this case, the patient with multiple tooth abrasion and clenching habit, the edentulous maxillary area is restored with amalgam inserted RPD, and the dentulous area of the maxilla and mandible are treated with fixed restoration accompanying with the increase of vertical dimension. Consequently, we are going to report about the satisfying result in both functional and esthetic aspects.

• The korean journal of orthodontics
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• v.33 no.6 s.101
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• pp.475-483
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• 2003

The purpose of this study is to evaluate hard and soft tissue changes following the subapical osteotomy in bimaxillary dentoalveolar protrusion patients requiring maximal retraction adult female patients was selected. Surgical procedures were performed by the same surgeon, anterior subapical osteotomy techniques were employed on the maxilla and cephalometric radiograms were traced and superimposed using the best-fit method and two reference The results were as follows 1. The bodily movement of the maxillary anterior segment was achieved in a posterior moved posteriorly with a slight correction of the lower incisors. 2. The horizontal soft tissue measurements changed significantly after treatment, but Nt and Sn vertical soft tissue measurements indicated that Ls moved inferiorly and Li superiorly. 3. The correlation between hard and soft tissue changes indicated that ${\Delta}HId/{\Delta}HLi,\;{\Delta}HId/{\Delta}LL-Eline,\;{\Delta}Hpt.B/{\Delta}HILS,\;and\;{\Delta}UI-FH/{\Delta}NL$ were significant. 4. More lower lip relative to upper lip retraction was demonstrated in relation to Rickett's E-line. The ratio between upper lip displacement was $50\%$, and between the lower incisor and lower lip displacement was $60\%$. We conclude from the results that the anterior subapical osteotomy is an efficient treatment severe dentoalveolar protrusion and desire rapid results.

• Journal of the korean academy of Pediatric Dentistry
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• v.36 no.4
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• pp.591-596
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• 2009

In the case of the impacted teeth, the clinician has to consider development of tooth, site of impaction, eruption path, and cooperation of patient. Treatment options for the management of impacted teeth are separated into four categories: observation, intervention, orthodontic or surgical relocation and extraction. Autotransplantation may be defined as the transplantation of embedded, impacted or erupted teeth, from one site to another in the same individual into extraction site or surgically prepared sockets. Autotransplantation ensures preservation of natural tooth, induction of alveolar bone growth and root development, offers one of the fastest and most economically feasible means in the replacement of young patients' missing teeth. This case presents a malpositioned impacted mandibular premolar of an 11-year-old girl. It was thought that orthodontic traction was difficult because of its unfavorable impacted position. Therefore the tooth was treated by autotransplantation, we can observe good healing pattern during 12 months.

• Journal of Dental Rehabilitation and Applied Science
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• v.35 no.4
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• pp.260-269
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• 2019

The prolonged neglect of the posterior teeth missing area may cause mesial drift, extrusion, unexpected movement of the adjacent teeth and alveolar bone loss with occlusion collapse. Therefore it is recommended to treat that area by the prosthesis as soon as possible after tooth missing. However, if orthodontic treatment is applied to move the remained teeth, it can create improved biomechanical dentoalveolar environment. The use of the third molars in teeth missing area provides advantages as optimizing of prosthesis size. However, crown shape, location, soundness of the third molar and possible of eruption failure should be considered. In this case report, two patients closed a second teeth missing site and reduced the size of the first and second teeth missing area for an implant by protraction of impacted third molars. This case reports the considerations for closing or reducing the posterior teeth space with protracting the third molars by comparing two patients.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.30 no.3
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• pp.225-231
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• 2008

This study evaluated whether there is a difference between a conventional titanium distraction device and a TiN-coated device in terms of implant osseointegration after horizontal distraction osteogenesis in narrow alveolar bone. Four adult mongrel dogs, each weighing $9{\sim}10kg$, were used in this study. The lower premolars were extracted and horizontal distraction was performed with conventional titanium distraction devices (group 1) or TiN-coated devices (group 2). After an 8-week consolidation period, the implants were installed, and the dogs were sacrificed after another 8 weeks. The osseointegration around the implants was evaluated histomorphologically. There was one failure in experimental group 1 because of fracture of the device. Direct bone contact was achieved and there were no significant differences between the control group and experimental groups 1 and 2 in terms of osseointegration around the implants at 8 weeks. In summary, intraoral distraction osteogenesis is a good option for augmenting severely atrophied alveolar ridges, and the TiN-coated device may be useful because of its advantages, which include surface hardness, corrosion resistance, and reduced bacteria.

• The Journal of the Korean dental association
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• v.53 no.5
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• pp.348-359
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• 2015

Objective: The aim of this study was to determine the effect of multi-layer of a collagen membrane alone or loaded rhBMP-2 on the buccal plate for ridge preservation after tooth extraction. Material and methods: Following bilateral extraction of the maxillary 1st and 3rd premolars in five dogs, rhBMP-2 loaded collagen membrane was applied to the buccal plates at the 1st premolar and collagen membrane only was applied to the buccal plates at the 3rd premolar unilaterally. The collagen membranes applied in the experimental groups were piled into four layers. The corresponding sites of the contralateral side healed naturally. After 3months of healing, the animals were sacrificed. Radiographic and histologic analyses were performed. Results: There was no significant difference in the healing of extraction socket at both 1st and 3rd premolars. In microcomputed tomography, the widths of the residual ridge of the experimental groups were similar with the controls. Histologically, the experimental groups did not exhibit different pattern compared to the controls regardless of the addition of rhBMP-2. Conclusion: Layering of the collagen membrane with or without rhBMP-2 on the buccal plate failed to show the effectiveness in dimensional preservation of the extraction socket.

• The Journal of the Korean dental association
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• v.47 no.10
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• pp.637-646
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• 2009

양성 종양(benign tumor)을 언급하기에 앞서 과오종(hamartoma) 및 과다 형성(hyperplasia)과의 차이를 구분할 필요가 있다. 양성 종양은 기원조직과 유사한 조직이 이상 증식하는 것으로 서서히 성장하지만 일반적으로 치료하기 전까지 이상 증식을 지속하는 진성 신생물을 일컫는다. 이에 비해 과오종은 정상 조직이 무질서하게 과증식하는 것으로 일정기간 후에는 성장을 멈추기 때문에 진성 신생물로 간주하지 않는다. 그러나 일부 과오종이 양성 종양에 포함되기도 하는데, 예를 들어 치아종은 정상적인 치성 조직의 성장이 완료되는 시기와 거의 동일한 시기에 성장을 멈추지만 양성 종양으로 분류된다. 과다 형성은 조직의 세포가 정상적인 배열 양상을 보이면서 세포의 수가 증가하는 것으로 지속적인 성장 양상을 보이지만 그 성장이 제한적이므로 양성 종양과는 구별된다. 양성 종양은 일반적으로 무통성으로 서서히 성장하기 때문에 종양의 크기가 증가하여 안면 종창이나 동통 등을 유발하는 경우에 발견될 수 있으며, 방사선검사에서 우연히 발견되기도 한다. 방사선검사는 병소의 위치, 범위, 특징 및 병소와 인접 해부학적 구조와의 관계 등 많은 방사선학적 진단 정보를 제공한다. 일부 종양은 방사선사진에서 매우 특징적인 소견을 나타내기 때문에 방사선학적 소견으로 예비 진단을 할 수 있을 정도의 진단정보를 제공하기도 하는 반면 어떤 종양들은 방사선사진에서 관찰되는 소견이 매우 유사하여 진단에 어려움을 주기도 한다. 따라서 종양의 확진을 위해서는 생검이 필수적이며, 방사선검사는 반드시 생검에 앞서 진행되어야만 정확한 방사선학적 진단을 할 수 있다. 양성 종양은 각각의 특징적인 방사선학적인 소견을 나타내지만 일반적으로 관찰되는 양성 종양의 특징이 존재하므로 이러한 일반적인 특징을 관찰하여 병소가 양성인지 악성인지를 감별할 수 있다. 첫째, 양성 종양은 대개 호발하는 부위가 있으므로 종양의 발생부위는 감별 진단을 하는 데 매우 중요하다. 일반적으로 치성 병소는 치아가 형성되는 하악관 상방의 치조돌기에서, 혈관성 및 신경성 병소는 하악관 내에서, 연골성 종양은 하악과두와 같이 연골세포가 잔존되어 있는 부위에서 발생하는 경우가 많다. 둘째, 양성 종양은 대체로 명확한 경계와 피질골성 변연을 보이며, 종종 병소가 결체조직으로 둘러싸여 있어 병소 주위에 방사선투과성 띠가 관찰되기도 한다. 셋째, 양성 종양은 일반적으로 인접 주위 조직에 압력을 가하면서 서서히 성장하기 때문에 인접 치아의 변위 또는 흡수, 피질골의 비박, 팽융 등의 소견을 보이며 피질골의 천공은 드물다. 방사선학적으로 양성 종양의 병소 내부는 방사선투과상으로 관찰되거나, 방사선불투과상으로 관찰되거나, 방사선투과상과 방사선불투과상이 혼재된 상으로 관찰된다. 저자는 이 지면에서 이러한 방사선학적 특징을 기초로 하여 구강악안면영역에 발생하는 양성 종양을 분류하고 각각의 특징에 대해 살펴보고자 한다.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.23 no.2
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• pp.163-168
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• 2001

Purpose : This study is conducted to evaluate the clinical success of secondary alveolar bone grafting using autogenous iliac particulate cancellous bone marrow in cleft maxilla. Materials and methods : We evaluated 107 cleft patients who had been admitted to the Dept. of Oral and Maxillofacial Surgery of Pusan National University Hospital from January 1, 1991 to January 31, 1999 and had been performed secondary alveolar bone grafting with autogenous particulated cancellous bone marrow from iliac crest. Results : 1. Men were 70 and women were 37, which shows 65.4% and 34.6% and the proportion of males to females was 1.9:1. Unilateral cases were 89(83.2%) and bilateral cases were 18(16.8%). 2. Age of bone grafting is widely distributed from 7 to 29, and the average was 13.2. 3. Success rate was 97.8% in unilateral cases, 94.4% in bilateral cases. Overall success rate was 96.7%. 4. We evaluated the bone graft contour by the percentage of bone attachment level adjacent to the alveolar cleft and the menial side showed 82.4% and the distal 87.7%. 5. The amount of notching the alveolar ridge at the grafted site through the ratio of notching length up to the most apical base to the length of proximal segment anatomic root was 0.19.

• Journal of Dental Rehabilitation and Applied Science
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• v.33 no.1
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• pp.19-24
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• 2017

Recently, flexible denture is widely used with some advantages such as esthetics, flexibility and biocompatibility. However, there is an opposite opinion about stability because of the movement of denture by the material's flexibility. As the denture moves to tissue surface during mastication, it irritates the supporting tissue. It can lead to trauma and rapid resorption of residual ridges if this irritation lasts for a long time. In this case, the patient has used flexible denture with insufficient stability, retention and support for several years and thus continuous irritation of the supporting tissue resulted in palate bone exposure. The patient discomfort and palate bone exposure underwent improvements by the new denture with stability and retention. A careful case selection for flexible denture, regular checkup and proper treatment are necessary to prevent the side effects.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.13 no.2
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• pp.185-190
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• 1991

Thr rickets or osteomalacia, that was induced by nonendocrine osseous or soft tissue tumor, is extremely rare disease and fourteen patients has been reported since 1947. The real nature of this disease is unknown, but postulated that unknown phosphaturic subtance which was elaborated from the tumor affect the renal tubule and produce hypophosphatemia and failure of calcification of osseous tissue. This case presented is that of 41-year-old man who suffered from severe generalized aching pain, severe muscular dystrophy, and shortening of the stature 4 years prior hospitalization. The causal coexisting tumor is walnut sized peripheral giant cell granuloma on the upper gingiva. After surgical removal of the tumor, patient's biochemical findings of the serum and urine were returned to the normal limits 12 days later, and clinical symptoms were marked relieved at 6 weeks later. The dental radiograms which were obtained 4 months later revealed remarkable bone regeneration and newly formed alveolar lamina dura.