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Joo Yeon KIM ; Geum Mee PARK ; Bong Hae CHO ; Kyung Soo NAH

Korean Journal of Oral and Maxillofacial Radiology.2002;32(4):231-234.

The odontogenic myxoma is an infiltrative benign tumor of bone that occurs almost exclusively in the jaw bones and comprises 3% to 6% of odontogenic tumors. This neoplasm is thought to arise from the primitive mesenchymal structures of a developing tooth, including the dental follicle, dental papilla, or periodontal ligament. Radiographically the odontogenic myxoma may produce several patterns: unicystic, multilocular, pericoronal, and radiolucent-radiopaque, making the differential diagnosis difficult. In this report, two cases of the odontogenic myxoma in the jaw bones are presented. The first case involved only the mandible, while the second case involved the maxilla. Both cases presented extensive multilocular radiolucencies characteristic of odontogenic myxoma.
Dental Papilla ; Dental Sac ; Diagnosis, Differential ; Jaw ; Jaw Neoplasms ; Magnetic Resonance Imaging ; Mandible ; Maxilla ; Myxoma* ; Odontogenic Tumors ; Periodontal Ligament ; Tooth

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Central odontogenic fibroma of the simple type.

Eui Hwan HWANG ; Sang Rae LEE

Korean Journal of Oral and Maxillofacial Radiology.2002;32(4):227-230.

The central odontogenic fibroma is a rare benign neoplasm, and considered to be derived from the mesenchymal tissue of dental origin. It is a poorly defined tumor of the jawbones which has only been infrequently reported in the literature. We report a histologically proven case of simple-type central odontogenic fibroma, which affected the left canine-premolar region of the maxilla in a 52-year-old woman.
Female ; Fibroma* ; Humans ; Jaw ; Maxilla ; Middle Aged ; Odontogenic Tumors

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Effects of 2-deoxy-D-glucose and quercetin on osteoblastic differentiation and mineralization in irradiated MC3T3-E1 cells.

Hyoun Suk AHN ; Kyoung A KIM ; Kwang Joon KOH

Korean Journal of Oral and Maxillofacial Radiology.2006;36(4):189-198.

PURPOSE: To investigate the in vitro response of MC3T3-E1 osteoblastic cells to X-ray in the presence and absence of 2 deoxy-D-glucose (2-DG) and quercetin (QCT). MATERIALS AND METHODS: The MC3T3-E1 cells were cultured in an alpha-MEM supplemented with 5 mM 2-DG or 10 micrometer QCT and then the cells were incubated for 12 h prior to irradiation with 2, 4, 6, and 8 Gy using a linear accelerator (Mevaprimus, Germany) delivered at a rate of 1.5 Gy/min. At various times after the irradiation, the cells were processed for the analyses of proliferation, viability, cytotoxicity, and mineralization. RESULTS: Exposure of the cells to X-ray inhibited the tritium incorporation, 3-(4, 5-dimethylthiazol-2yl-)-2, 5- diphenyl tetrazolium bromide (MTT)-reducing activity, and alkaline phosphatase (ALP) activity, and caused cytotoxicity and apoptosis in a dose-dependent manner of the X-ray. This effect was further apparent on day 3 and 7 after the irradiation. RA+2-DG showed the decrease of DNA content, cell viability, and increase of cytotoxicity rather than RA. ALP activity increased on day 7 and subsequently its activity dropped to a lower level. 2-DG suppressed the calcium concentration, but visual difference of number of calcified nodules between RA and RA+2-DG was not noticed. RA+QCT showed the increase of DNA content, cell viability, but decrease of cytotoxicity and subG1 stage cells in the cell cycle, and increased calcified nodules in von Kossa staining rather than the RA. ALP activity showed significant increases on day 7 and subsequently its activity dropped to a lower level. CONCLUSION: The results showed that the 2-DG acted as a radiosensitizing agent and QCT acted as a radioprotective agent respectively in the irradiated MC3T3-E1 osteoblast-like cells.
Alkaline Phosphatase ; Apoptosis ; Calcium ; Cell Cycle ; Cell Survival ; Deoxyglucose* ; DNA ; Osteoblasts* ; Particle Accelerators ; Quercetin* ; Tritium

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Bone changes after bilateral sagittal split osteotomy for mandibular prognathism.

Hyun Jung PARK ; Yun Hoa JUNG ; Bong Hae CHO

Korean Journal of Oral and Maxillofacial Radiology.2006;36(4):183-188.

PURPOSE: The purpose of this research was to study bone changes after bilateral sagittal split osteotomy through fractal analysis and measurement of mandibular cortical thickness. MATERIALS AND METHODS: This study included twenty-two prognathic patients who underwent bilateral sagittal split osteotomy. Panoramic radiographs of these patients were taken immediately before operation and at 1 month, 6 months, and 12 months postoperatively. The fractal dimension was measured by the box-counting method in the region of interest centered on both the basal and interdental bones between the first and second mandibular molars. Measurements of mandibular cortical thickness were taken both in the area between the first and second mandibular molars and at the osteotomy site. Changes of fractal dimension and cortical thickness over four stages were statistically analyzed. RESULTS: The fractal dimension of the mandibular basal bone before surgery and after 1 month, 6 months and 12 months were 1.4099+/-0.0657, 1.382+/-0.0595, 1.2995+/-0.0949, and 1.4166+/-0.0676, respectively (Repeatedmeasures ANOVA, P <0.001). However, no statistically significant differences were noted in interdental fractal dimensions among the four stages. Mandibular cortical thickness between the first and second mandibular molars before operation and after 1 month, 6 months and 12 months was 3.74+/-0.48 mm, 3.63+/-0.47 mm, 3.41+/-0.61mm and 3.55+/-0.66mm(P <0.01), respectively. Mandibular cortical thickness at the osteotomy site at each of the four stages was 3.22+/-0.44 mm, 2.87+/-0.59 mm, 2.37+/-0.61 mm and 2.64+/-0.62 mm, respectively (P <0.001). CONCLUSION: This study suggests that the mandibular tissue continued decreasing for 6 months postoperatively and then increased over the subsequent 6 months.
Fractals ; Humans ; Mandible ; Molar ; Osteotomy* ; Prognathism*

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Diagnostic ability of differential diagnosis in ameloblastoma and odontogenic keratocyst by imaging modalities and observers.

Tae In GANG ; Kyung Hoe HUH ; Won Jin YI ; Min Suk HEO ; Sam Sun LEE ; Jeong Hwa KIM ; Je Woon MOON ; Soon Chul CHOI

Korean Journal of Oral and Maxillofacial Radiology.2006;36(4):177-182.

PURPOSE: To evaluate the diagnostic ability in differentiating between ameloblastoma and odontogenic keratocyst according to the imaging modalities and observers. MATERIALS AND METHODS: We evaluated thirty-six cases of ameloblastomas and forty-seven cases of odontogenic keratocysts all histologically confirmed. Six oral and maxillofacial radiologists diagnosed the lesions by 3 methods: using panoramic radiograph, using computed tomograph (CT), and using panoramic radiograph and CT. The observers were classified by 3 groups: group 1 had experienced over 10 years in oral and maxillofacial radiologic field, group 2 had experienced for 3-4 years, and group 3 was in the process of residentship. After over 2 weeks, the observers diagnosed them by the same methods. RESULTS: The ROC curve areas except for group 3 were the highest with interpretation using panoramic radiograph and CT, followed by interpretation using CT only, and the lowest with interpretation using panoramic radiograph only. The overall difference was not found in diagnostic ability among groups in using panoramic radiograph only, but there was difference in diagnostic ability of group 1 and 2 vs 3 in using CT only, and combination panoramic radiograph and CT. CONCLUSIONS: To differentiate between ameloblastoma and odontogenic keratocyst more accurately, the experienced oral and maxillofacial radiologist should diagnose with combination of panoramic radiograph and CT.
Ameloblastoma* ; Diagnosis, Differential* ; Odontogenic Cysts* ; ROC Curve

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Congenital infiltrating lipoma with intrabony invasion into maxilla.

Kyung Hoe HUH ; Hyang Ok LEE ; Seo Young LEE ; Hyung kil CHOI ; Byung gak HA ; Je Woon MOON ; Sam Sun LEE

Korean Journal of Oral and Maxillofacial Radiology.2007;37(2):111-115.

Infiltrating lipoma is a rare mesenchymal neoplasm that, in spite of benign nature, characteristically infiltrates adjacent tissues and tends to recur after surgery. It has a predilection for the extremities and the trunk and is extremely rare in the head and neck region. We present a case of congenital infiltrating lipoma of the face, describing the intrabony invasion and osseous dystrophy as well as the soft tissue changes seen on plain radiographs and magnetic resonance imaging.
Extremities ; Head ; Lipoma* ; Magnetic Resonance Imaging ; Maxilla* ; Neck

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Congenital infiltrating lipoma with intrabony invasion into maxilla.

Kyung Hoe HUH ; Hyang Ok LEE ; Seo Young LEE ; Hyung kil CHOI ; Byung gak HA ; Je Woon MOON ; Sam Sun LEE

Korean Journal of Oral and Maxillofacial Radiology.2007;37(2):111-115.

Infiltrating lipoma is a rare mesenchymal neoplasm that, in spite of benign nature, characteristically infiltrates adjacent tissues and tends to recur after surgery. It has a predilection for the extremities and the trunk and is extremely rare in the head and neck region. We present a case of congenital infiltrating lipoma of the face, describing the intrabony invasion and osseous dystrophy as well as the soft tissue changes seen on plain radiographs and magnetic resonance imaging.
Extremities ; Head ; Lipoma* ; Magnetic Resonance Imaging ; Maxilla* ; Neck

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Evaluation of danger zone in mesial root of mandibular first molar by cone beam computed tomography (CBCT).

Yoo Rhee CHANG ; Yong Suk CHOI ; Gi Woon CHOI ; Sang Hyuk PARK

Korean Journal of Oral and Maxillofacial Radiology.2007;37(2):103-110.

PURPOSE: To examine the danger zone of mesial root of mandibular first molar of patient without extraction using CBCT(cone -beam computed tomography) to avoid the risk of root perforation. MATERIALS AND METHODS: 20 mandibular first molars without caries and restorations were collected. CT images were obtained by CBCT(PSR9000N TM, Asahi Roentgen Co., Japan), reformed and analyzed by V-work 5.0 (CyberMed Inc., Korea). Distance between canal orifice and furcation was measured. In cross sectional images at 3, 4 and 5 mm below the canal orifice, distal wall thickness of mesiobuccal canal (MB-D), distal wall thickness of mesiolingual canal (ML-D), distal wall thickness of central part (C-D), mesial wall thickness of mesiobuccal canal (MB-M) and mesial wall thickness of mesiolingual canal (ML-M) were measured. RESULTS: The mean distance between the canal orifice and the furcation of the roots is 2.40 mm. Distal wall is found to be thinner than mesial wall. Mean dentinal wall thickness of distal wall is about 1 mm. The wall thickness is thinner as the distance from the canal orifice is farther. But significant differences are not noted between 4 mm and 5 mm in MB-D and C-D. MB-D is thinner than ML-D although the differences is not significant. CONCLUSION: The present study confirmed the anatomical weakness of distal surface of the coronal part of the mesial roots of mandibular first molar by CBCT and provided an anatomical guide line of wall thickness during endodontic treatment.
Cone-Beam Computed Tomography* ; Dentin ; Humans ; Molar*

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Evaluation of danger zone in mesial root of mandibular first molar by cone beam computed tomography (CBCT).

Yoo Rhee CHANG ; Yong Suk CHOI ; Gi Woon CHOI ; Sang Hyuk PARK

Korean Journal of Oral and Maxillofacial Radiology.2007;37(2):103-110.

PURPOSE: To examine the danger zone of mesial root of mandibular first molar of patient without extraction using CBCT(cone -beam computed tomography) to avoid the risk of root perforation. MATERIALS AND METHODS: 20 mandibular first molars without caries and restorations were collected. CT images were obtained by CBCT(PSR9000N TM, Asahi Roentgen Co., Japan), reformed and analyzed by V-work 5.0 (CyberMed Inc., Korea). Distance between canal orifice and furcation was measured. In cross sectional images at 3, 4 and 5 mm below the canal orifice, distal wall thickness of mesiobuccal canal (MB-D), distal wall thickness of mesiolingual canal (ML-D), distal wall thickness of central part (C-D), mesial wall thickness of mesiobuccal canal (MB-M) and mesial wall thickness of mesiolingual canal (ML-M) were measured. RESULTS: The mean distance between the canal orifice and the furcation of the roots is 2.40 mm. Distal wall is found to be thinner than mesial wall. Mean dentinal wall thickness of distal wall is about 1 mm. The wall thickness is thinner as the distance from the canal orifice is farther. But significant differences are not noted between 4 mm and 5 mm in MB-D and C-D. MB-D is thinner than ML-D although the differences is not significant. CONCLUSION: The present study confirmed the anatomical weakness of distal surface of the coronal part of the mesial roots of mandibular first molar by CBCT and provided an anatomical guide line of wall thickness during endodontic treatment.
Cone-Beam Computed Tomography* ; Dentin ; Humans ; Molar*

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Absorbed and effective dose from newly developed cone beam computed tomography in Korea.

Jong Nyeong LEE ; Won Jeong HAN ; Eun Kyung KIM

Korean Journal of Oral and Maxillofacial Radiology.2007;37(2):93-102.

PURPOSE: Cone beam computed tomography (CBCT) provides a lower dose and cost alternative to conventional CT, promising to revolutionize the practice of oral and maxillofacial radiology. The purpose of this study was to evaluate the absorbed and effective doses of Implagraphy and VCT (Vatech Co., Hwasung, Korea) and compare them with those of panoramic radiography. MATERIALS AND METHODS: Thermoluminescent dosimeter (TLD) chips were placed at 27 sites throughout the layers of Female ART Head and Neck Phantom for dosimetry. Implagraphy, VCT units, and Planmeca Proline XC panoramic unit were used for radiation exposures. Radiation weighted doses and effective doses were measured and calculated using 1990 and 2005 ICRP tissue weighting factors. RESULTS: Effective doses in Sv (ICRP 2005, ICRP 1990) were 90.19, 61.62 for Implagraphy at maxillay molar area, 123.20, 90.02 for Implagraphy at mandibular molar area, 183.55, 139.26 for VCT and 40.92, 27.16 for panoramic radiography. CONCLUSION: Effective doses for VCT and Implagraphy were only about 2.2 to 4.5 times greater than those for panoramic radiography. VCT and Implagraphy, CBCT machines recently developed in Korea, showed moderately low effective doses.
Cone-Beam Computed Tomography* ; Female ; Head ; Humans ; Korea* ; Molar ; Neck ; Proline ; Radiography, Panoramic

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