• Imaging Science in Dentistry
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• 제40권4호
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• pp.197-201
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• 2010

Osteopetrosis is a rare bone disease characterized by systemic osteosclerosis due to an osteoclast dysfunction that decreases bone resorption. This report demonstrates two cases of adult osteopetrosis with secondary osteomyelitis of the maxilla, in siblings who are 43-year old female and 55-year old, male respectively. The common radiographic features of these cases were increased radiopacity in skull, rib and vertebra. The radiographic features that differed between these two cases were the osteosclerotic pattern of the jaw bones, that is, diffuse patterns in the female case, while the male case showed nodular patterns that were confined to the root apices. The diagnosis of osteopetrosis may be complicated due to the varying degree of osteosclerosis on panoramic radiograph. Additional radiographs such as the chest and skull radiograph may be helpful for the diagnosis of osteopetrosis.

• 한국수산과학회지
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• 제52권4호
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• pp.389-399
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• 2019

This study is designed to observe the development of skeleton of Sakhalin sole Limanda sakhalinensis in order to use the findings as the basic data for the taxonomic research. As for the development of skeleton, on 20 days of the hatch when its average total length was 5.86 mm, the clavicle and the paraspenoid in the cranium were ossified. As for the jaw bone, the premaxillary and the dentary were ossified. On 28 days of hatch when its total length was 7.05 mm, 25 neural spines and 22 hemal spines were ossified and 5 fin rays appeared. On 34 days of hatch when its average total length was 8.40 mm, the end of tail was twisted by $45^{\circ}$ and 3 hypural bones were ossified. On 48 days of hatch when its average total length was 10.1 mm, 2 actinosts below the postcleithrum were ossified. On 54 days of hatch, when the average total length was 10.4 mm, the ethmoid, prootic and exoccipital were ossified, thus completing the ossification of skeleton.

• 한국수산과학회지
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• 제26권5호
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• pp.465-476
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• 1993

1992년 10월부터 부산, 경상남도 거제도 등에서 낚시, 주낚 및 어시장에서 채집한 친어들을 육상수조로 운반하여 사육하던 중, 1993년 1월 부터 5마리의 친어에서 자연 산출한 자어를 사육하면서 성장에 따른 외부형태와 골격 발달과정을 관찰한 결과는 다음과 같다. 1. 산출직후 자어의 평균전장은 6.05mm로 아직 난황은 완전히 흡수되어 있지 않으나, 입과 항문은 열려 있으며, 근절수는 $8+18{\sim}19=26{\sim}27$개이다. 2. 산출후 7일째 후기자어는 평균전장 7.10mm로 난황과 유구한 완전하게 흡수되고, 골격 중 섭이활동과 관련된 악골이 가장 먼저 골화하기 시작한다. 3. 산출후 21일째 후기자어는 평균전장 8.50mm 두개부에 한쌍의 극이 형성되며, 척색말단이 위로 굽어지기 시작한다. 4. 지느러미의 분화는 꼬리, 가슴, 등, 뒷, 배지느러미 순으로 이루어진다. 5. 산출후 $65{\sim}69$일째 개체는 전장 $17.60{\sim}20.80mm$로 모든 지느러미가 완전하게 형성되어 치어기로 이행하며, 모든 골격의 골화가 완료되어 완전한 골격의 형태를 갖춘다.

• 한국어류학회지
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• 제13권1호
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• pp.63-68
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• 2001

1997년 1월부터 전라남도 완도군 연안에서 연승어업에 의해 어획된 붉은쏨뱅이를 육상수조에서 사육하던 중, 4월과 5월에 자연산출한 자치어를 사육하면서 관찰한 자치어의 골격발달과정은 다음과 같다. 산출 후 8일의 후기자어는 전장이 4.23~4.60 mm(평균 4.42 mm, n=5)로 가장 먼저 견대부(肩帶部) (shoulder girdle)에 소골(銷骨) (clavicle)과 약골(顎骨) (jaw bones) 부분의 위턱에 전상약골(前上顎骨) (premaxillary), 주상약골(主上顎骨) (maxillary), 아래턱에 치골(齒骨) (dentary)이 골화(骨化)하기 시작하였으며, 두개부(頭蓋部) (cranium)의 배쪽면에 가늘고 긴 막대기 모양의 부설골(副楔骨) (parasphenoid)이 골화(骨化)되었다. 산출 후 15일의 후기자어는 전장이 4.81~5.51 mm (평균 5.23 mm, n=5)로 두개부(頭蓋部)에 익이골(翼耳骨) (pterotic), 기저후두골(基底後頭骨) (basioccipital), 외후두골(外後頭骨) (exoccipital)이 골화(骨化)하기 시작하였고, 두정부(頭頂部)에 1개의 극(棘)이 형성되었으며, 새개부 (opercular)에 주새개골 (opercle)과 1개의 극(棘)을 가진 전새개골(preopercle)이 최초로 골화(骨化)하기 시작하였다. 산출 후 27일의 후기자어는 전장이 7.94~9.85 mm (평균 8.81 mm, n = 5)로 전새개골에 5개의 극(棘)이 형성되었고, 척추골(脊椎骨)은 머리쪽에서 꼬리쪽으로 골화(骨化)하여 15개의 추체(椎體) (centrum)가 골화(骨化)되었다. 산출 후 39일의 치어는 전장이 14.14~14.27 mm (평균 14.21 mm, n=5)로 모든 골격이 완성되었다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제38권1호
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• pp.29-37
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• 2012

Introduction: Fibrous-osseous lesions of the jaws are difficult to diagnose precisely until excised biopsy results are found, so they might be confused with malignant lesions. This clinical study focused on the diagnostic aids of lesions that demonstrate different clinical, radiologic, and histological findings. Materials and Methods: A total of 16 patients with benign fibrous-osseous lesions on the jaws (6 fibrous dysplasias, 6 ossifying fibromas, 3 cemental dysplasias, and one osteoblastoma) were reviewed. Nine patients with malignant fibrous-osseous lesions (8 osteosarcomas and one Ewing's sarcoma) were also retrospectively reviewed. Results: Osteosarcoma patients complained of facial swelling and tooth mobility. The radiographic findings showed the irregular resorption of cortical bone and periosteal reactions. Histological features included cellular pleomorphism and atypical mitosis. An Ewing's sarcoma patient complained of tooth mobility and facial swelling. Onion-skin appearance and irregular expansile marginal bony radiolucency were seen in the radiography. Fibrous dysplasia patients complained of facial swelling and asymmetry. The radiographic features were mostly ground-glass radiopacity. Histological findings showed a bony trabeculae pattern surrounded by fibrous ground substances. Ossifying fibroma patients complained of buccal swelling and jaw pains, showing expanded cortical radiolucent lesions with a radiopaque margin. Histological findings were revealed as cellular fibrous stroma with immature woven bones. In cemental dysplasia, most of their lesions were found in a routine dental exam. Well-circumscribed radiopaque lesions were observed in the radiography, and cementum-like ossicles with fibrous stroma were seen in the microscopy. An osteoblastoma patient complained of jaw pain and facial swelling. Radiographic findings were mottled, dense radiopacity with osteolytic margin. Trabeculae of the osteoid with a vascular network and numerous osteoblasts with woven bone were predominantly found in the microscopy. Conclusion: Our study showed similar results as other studies. We suggest the clinical parameters of diagnosis and treatment for malignant and benign fibrous-osseous lesions of the jaws.

• Journal of Periodontal and Implant Science
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• 제46권4호
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• pp.234-243
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• 2016

Purpose: Immediate loading of dental implants has been proved to be feasible in partially edentulous jaws. The purpose of this retrospective investigation was to assess the feasibility of immediately loading dental implants in fully edentulous jaws. Methods: A total of 24 patients aged between 53 and 89 years received a total of 154 implants in their edentulous maxillae or mandibles. Among the implants, 45 were set in fresh extracted sockets and 109 in consolidated alveolar bones. The implants were provisionally managed with chair-side made provisional resin bridges and exposed to immediate loading. Implants were followed up for 1-8 years, including radiographic imaging. Marginal bone levels were evaluated based on radiographic imaging. Results: A total of 148 out of the 154 implants survived over the follow-up period of 1 to 8 years, giving a survival rate of 96%. The time or region of the implantation, the pre-implant augmentation, and the length and diameter of the implants had no statistically significant influence on the survival or the success rate. The marginal bone level remained stable with only minimal loss of 0.3 mm after 60 months of loading. Conclusions: Within the limitations of this study, immediate loading is feasible for dental implants in edentulous jaws.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제41권5호
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• pp.232-239
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• 2015

Objectives: The purpose of this study was to estimate the volumetric change of augmented autobone harvested from mandibular body cortical bone, using cone-beam computed tomography (CBCT) and three-dimensional reconstruction. In addition, the clinical success of dental implants placed 4 to 6 months after bone grafting was also evaluated. Materials and Methods: Ninety-five patients (48 men and 47 women) aged 19 to 72 years were included in this study. A total of 128 graft sites were evaluated. The graft sites were divided into three parts: anterior and both posterior regions of one jaw. All patients included in the study were scheduled for an onlay graft and implantation using a two-stage procedure. The dental implants were inserted 4 to 6 months after the bone graft. Volumetric stability was evaluated by serial CBCT images. Results: No major complications were observed for the donor sites. A total of 128 block bones were used to augment severely resorbed alveolar bone. Only 1 of the 128 bone grafts was resorbed by more than half, and that was due to infection. In total, the average amount of residual grafted bone after resorption at the recipient sites was $74.6%{\pm}8.4%$. Conclusion: Volumetric stability of mandibular body autogenous block grafts is predictable. The procedure is satisfactory for patients who want dental implants regardless of atrophic alveolar bone.

• 치과방사선
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• 제29권1호
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• pp.341-355
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• 1999

Squamous cell carcinoma is the most common type of oral cancer and odontogenic myxoma is relatively uncommon benign tumor of mesenchymal origin. There are, to our knowledge, no prior reports of simultaneously occurring squamous cell carcinoma and odontogenic myxoma of the jaw bones. In this case, at first, the plain films and computed tomograms revealed a large expansile multilocular radiolucent lesion on left mandible and marked expansion of cortical plate. In addition this radiograms revealed also infiltrative bony destruction of anterior and medial border of ascending ramus of left mandible and alveolar bone of left maxilla, floating teeth on left lower molar area and metastatic enlargement of left submandibular, jugular digastric and spinal accessory lymphnodes. Magnetic resonance imaging of this patient revealed infiltrative growth of tumor on alveolar bone of left maxilla, left retromolar fat pad. left masseter and left medial pterygoid muscle. Intraoral presurgical biopsy presented typical features of squamous cell carcinoma. After chemotherapy with radiation therapy during 6 months. this central lesion was diagnosed as odontogenic myxoma by the postsurgical biopsy. After 3 months, this patient presented multiple metastatic signs at lumbar spines, rib and liver. Consequently, our case is simultaneous occurrence of squamous cell carcinoma and odontogenic myxoma.

• 대한두경부종양학회지
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• 제40권1호
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• pp.55-58
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• 2024

Myxoma is a locally invasive neoplasm usually involving the jaw bones, typically occurs between the second and fourth decades. This tumor may comprise 3%-6% of odontogenic tumors. Myxomas of the soft tissue of the face are very rare. We present an unusual case of myxofibroma occurring in a 13-year-old man involving the soft tissue of the face. It congenitally occurred and was a 1 cm sized, ovoid in shape, swelling located on the glabella without any symptoms. An excisional biopsy was performed. A well encapsulated ovoid mass was attached to the corrugator supercilli muscle below the frontalis muscle. It was measured 1.1 × 1 × 0.8 cm and completely excised. Histological examination revealed myxofibroma showing stellate and spinde-shaped cells throughout myxoid ground substance. The unusual features of this case are the site of the tumor, which was localized to the non-tooth bearing area of the mandible and its congenital occurrence history.

• 한국어류학회지
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• 제4권1호
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• pp.1-13
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• 1992

1990년(年) 4월(月)과 5월(月)에 부산시(釜山市) 해운대구 동백섬 내에 위치한 부산수산대학교 부설 해양연구소 앞 조간대(潮間帶)에서 미끈망둑 친어(親魚)들의 산난습성(産卵習性)과 5회에 걸쳐 간조시(干潮時) 작은 돌의 하면(下面)에 자연산란하여 부착된 난을 실험실로 운반하여 난발생과정(卵發生過程)과 성장(成長)에 따른 자치어(仔稚魚) 외부형태(外部形態)와 내부골격 발달과정(發達過程)을 관찰(觀察)한 결과를 요약하면 다음과 같다. 1. 산난(産卵)은 간조시(干潮時)에 조간대의 작은 돌 축조물의 하면(下面)에 하며, 산란후 수컷은 난을 보호(保護)하는 습성(習性)이 있다. 2. 수정난(受精卵)은 난경이 $2.71{\sim}2.80{\times}0.65{\sim}0.74mm$로 부착사를 지닌 투명한 침성난이다. 3. 부화(孵化)에 소요된 시간(時間)은 사육수온 $19.5{\sim}25.5^{\circ}C$(평균(平均) $22.7^{\circ}C$)에서 배체형성(胚體形成) 후(後) 98시간만에 부화(孵化)한다. 4. 부화직후(孵化直後)의 자어(仔魚)들은 평균(平均) 전장(全長) 3.90mm로 입과 항문(肛門)이 열려있고, 흑색소포(黑色素胞)는 두정부(頭頂部), 부레 위, 체측(體側)의 등쪽과 배쪽 및 복면(腹面)에 분포하며, 근절수(筋節數)는 35-36개이다. 5. 부화후(孵化後) 11일째 평균전장(平均全長) 5.50mm의 자어(仔魚)는 등지느러미와 뒷지느러미가 생길 부분이 융기(隆起)하기 시작한다. 6. 부화후(孵化後) 16일째 자어(仔魚)는 평균(平均) 전장(全長) 6.20mm로 척색말단이 $45^{\circ}$위로 굽어진다. 7. 부화후(孵化後) 48-50일째 개체는 평균(平均) 전장(全長) 13.40mm로 배지느러미가 완전하게 생성(生成)되어 모든 지느러미 줄기가 정수(定數)에 달하며 치어기(稚魚期)로 이행한다. 8. 부화후(孵化後) 11일째 전장(全長) 5.50mm에서 두개골(頭蓋骨) 중(中) 부설골(副楔骨) 기저후두골(基底後頭骨)의 일부가 가장 먼저 골화(骨化)하고 내장골(內臟骨) 중(中) 호흡, 섭이와 관련된 악골(顎骨)과 새개골 등이 골화(骨化)한다. 9. 척추골(脊椎骨)은 앞쪽에서 뒤로 골화(骨化)가 진행되며, 신경극(神經棘)과 혈관극(血管棘)은 대응하는 추체(椎體)에 앞서서 골화(骨化)한다. 10. 악골(顎骨)은 비교적 두개골(頭蓋骨)과 척추골(脊椎骨)보다 먼저 골화(骨化)되어 부화 (孵化)18일째 전장(全長) 6.60mm에서 기본적인 형태(形態)를 갖춘다. 11. 대부분 내부골격은 부화(孵化) 47~50일째 평균(平均) 전장(全長) 13.40mm에서 거의 골화(骨化)가 완성되어 성어(成魚)와 비슷한 형태(形態)를 갖춘다.