• Imaging Science in Dentistry
• /
• v.35 no.4
• /
• pp.199-202
• /
• 2005

Purpose : To report the incidence of radiological findings from screening panoramic radiographs and verify the validity of the panoramic radiography for screening purposes. Materials and Methods : Six thousand one hundred and sixty panoramic radiographs taken from the patients visiting the Health Promotion Center of CNUH were selected for this retrospective study. Panoramic radiographs were examined into the following pathologic conditions : the presence of periodontal bone loss, dental caries, periapical radiolucencies, retained roots, impacted supernumerary teeth, impacted third molars, odontoma, cystic lesions other than radicular cyst, sialoliths, and mixed radiolucent-radiopaque lesions. Number of pathologic conditions and Prevalence values were recorded. Results: The prevalences of pathologic conditions were $72.9\%$ of periodontal bone loss, $32.2\%$ of dental caries, $11.9\%$ of periapical radiolucencies, $10.8\%$ of retained roots, $0.4\%$ of root fracture, $1.0\%$ of impacted supernumerary teeth, $1.0\%$ of impacted third molars, $0.06\%$ of odontoma, $0.08\%$ of cystic lesion other than radicular cyst, $0.2\%$ of prolonged retention of deciduous tooth, $0.1\%$ of sialolith, and $0.04\%$ of mixed radiopaque and radiolucent lesion. Conclusion : Although the panoramic radiograph should not be used to replace intraoral radiographic and clinical examinations, this study showed that many dental pathologic conditions could be detected on panoramic radiographs. The panoramic radiograph might serve as a diagnostic aid in dental health evaluation programs.

• Journal of Korean Academy of Oral and Maxillofacial Radiology
• /
• v.26 no.2
• /
• pp.109-120
• /
• 1996

Nine cases presented with a calcifying odontogenic cyst to the Dental Hospital of the College of Dentistry, Yonsei University. from January 1987 to September June, 1996, Clinical or histopathological findings were observed according to each radiologic criteria. The results obtained are as follows : 1. The male to female ratio was 2 : 1 with a mean age of 25 years. 2. The radiographic appearences of nine cases were well-defined radiolucent lesions in which eight cases were shown unilocular lesions and only one lesion was seen multilocular lesion. 3. Radiologically. three of nine cases were pure radiolucent lesions and others, six cases were radiolucent contained a variable amount of radiopaque material. 4. Histologically, two cases were classified simple cyst, five were cyst associated odonoma, two were neoplastic type. 5. Histological findings according to the radiological classification, two of three radiolucenct lesions were simple cysts; another was a cyst associated with odontoma. While, four of six radiologic mixed lesions turned out to be a cyst associated with odontoma, two was the neoplastic type.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.30 no.3
• /
• pp.489-494
• /
• 2003

Odontomas are the common type of odontogenic tumors and generally they are asymptomatic, depending upon size, location and their limited growth potential. they are rarely diagnosed before the second decade of life, and the frequently lead to impaction or delayed eruption of permanent teeth. Odontomas are classified of compound as compound or complex by morphology. Complex odontomas are unorganized masses of odontogenic tissues, morphologically not resembling the teeth, account for approximately 25 percent of all odontomas, 22 percent of odontogenic tumor of the jaws, and have a predilection for the posterior mandible in males. The etiology of odontomas is unknown, although local trauma, infection, and genetic factors have been suggested. Usually, treatment of odontoma is conservative sugical removal and their is little probability of recurrence. This paper describes two cases of complex odontomas diagnosed in children due to impaction of maxillary first molar in all cases, the surgical excision of the lesions was performed. Follow-up after 2 years, showed spontaneous eruption of the first permanent molar to the occlusal plane.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.34 no.4
• /
• pp.651-657
• /
• 2007

Odontomas are the common type of odontogenic tumors and generally are asymptomatic and frequently lead to impaction or delayed eruption of permanent teeth. They are composed of enamel, dentin, cementum and pulp tissue and are divided into compound and complex according to the morphology of the hard tissues. Compound odontomas consist of varying numbers of small toothlike structure and have a predilection for the maxillary anterior regions. Complex odontomas consist of an unorganized mass of odontogenic tissues and comprise approximately 25 percent of all odontomas and have a predilection for the mandibular posterior regions. The etiology of odontomas is uncertain but hypothesized to involve local trauma, infection and genetic factors. Treatment of odontoma is conservative surgical removal and are little probability of recurrence. These two cases were about the patients with delayed eruption of mandibular first molar and mandibular lateral incisor. We surgically removed odontoma, exposed impacted tooth and guided impacted tooth into normal position by orthodontic traction. At the completion of traction, the mandibular first molar and mandibular lateral incisor was positioned fairly within the arch and complications such as root resorption were not observed.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.27 no.4
• /
• pp.564-572
• /
• 2000

We decided among extraction, orthodontic traction and autotransplantation such as direction and position of unerupted tooth, degree of developing root apex, eruption space, being of supernumerary tooth or odontoma or cyst when tooth impacted. Autotransplantation is considered when orthodontic traction is unrealistic or when tooth movement can absorb root of neighbor tooth. The prognosis for successful autotransplantation is dependent on a number of factors such as root development, surgical technique, patient's age, endodontic treatment, time and type of splinting, preservation of periodontal ligament and storage medium. Especially when severe osseous defect is being, bone graft considered for reducing of mobility and for assisting recovery. In all cases, chief complaint is unerupted tooth and various causing factors were supernumerary, odontoma, ectopia and so on. Before autotransplantation, space regaining was done if needed and demineralized freezed dried bone and autogenous bone graft was done when there is severe osseous defect by extraction of supernumerary tooth or odontoma. Splinting was removed after 2-3weeks At 3-4weeks after autotransplantation, endodontic treatment was decided. At follow up check, normal recovery was done and there was no inflammatory or replacement root resorption in periapical radiograph.

• The Journal of the Korean dental association
• /
• v.25 no.11 s.222
• /
• pp.1061-1068
• /
• 1987

• Journal of Korean Academy of Oral and Maxillofacial Radiology
• /
• v.19 no.1
• /
• pp.89-101
• /
• 1989

The author observed and analyzed the age, sex, chief complaint and radiographic finding of sixty-one cases of benign odontogenic tumors seen in Yonsei Medical Center, for the period of Jan. 1979 to Aug. 1989. The results were as follows: 1. Benign odontogenic tumors of 61 cases included 52 cases (85.3%) of ameloblastoma and odontoma, and 9 cases of other lesions. Radiographically, the border of the lesions were well-defined. 2. Ameloblastoma constituting twenty-seven cases (44.3%) occurred the average age of 31.1 years and had a 3:1 male predominance. The most common complaint was swelling (20 cases, 74.0%) and followed by pain (13 cases, 48.2%). Radiographically, the most common site was mandibular body area (74.0%) and the lesions were mainly multiocular radiolucency; in 17 cases (63.0%) and unilocular radiolucent lesion were seen in 10 cases (37.0%). 16 cases (59.3%) showed the resorption of roots of adjacent teeth. 3. Odontoma constituting twenty-five cases (41.0%) discovered at the average age of 16.9 years and had a 3:2 male predominance. The most common complaint was delayed eruption of tooth (8 cases, 31.0%) and 7 cases (27.0%) detected on a routine radiograph of the area. Radiographically, 17 cases (68.0%) were of compound type and 8 were of complex variety and compound odontomas were common in the anterior maxilla, whereas complex odontomas occurred more frequently in the posterior mandible. 19 cases (76.0%) showed the impaction of adjacent teeth.

• Imaging Science in Dentistry
• /
• v.45 no.3
• /
• pp.187-192
• /
• 2015

Cleidocranial dysplasia (CCD) is a rare congenital disorder, typically characterized by persistently open skull sutures, aplastic or hypoplastic clavicles, and supernumerary teeth. Mutations in the gene encoding the runt-related transcription factor 2 (RUNX2) protein are responsible for approximately two thirds of CCD patients. We report a 20-year-old CCD patient presenting not only with typical skeletal changes, but also complex dental anomalies. A previously undiagnosed odontoma, 14 supernumerary teeth, a cystic lesion, and previously unreported fused primary teeth were discovered on cone-beam computed tomography (CBCT) scans. Mutation analysis identified the causal c.578G>A (p.R193Q) mutation in the RUNX2 gene. At 20 years of age, the patient had already missed the optimal period for dental intervention. This report describes the complex dental anomalies in a belatedly diagnosed CCD patient, and emphasizes the significance of CBCT assessment for the detection of dental anomalies and the importance of early treatment to achieve good outcomes.

• The Journal of the Korean dental association
• /
• v.50 no.6
• /
• pp.312-321
• /
• 2012

Permanent canine are very important teeth in point of function as well as esthetic. Therefore impaction of canines is a frequently encountered clinical problems. The incidence of impaction ranges between 1-3%. The cause of canine impaction can be result of ectopic position of tooth germ, defect of dental follicle, early loss or delayed exfoliation primary canine, space problem, supernumarary teeth, cyst, odontoma, Impaction frequently involves further complication such as root resorption of adjacent teeth, cyst formation and migration of the neighboring teeth. Various treatment modalities include extraction of primary canine, surgical opening and orthodontic traction, autotransplantation, surgical extraction of impacted canine.

• Archives of Craniofacial Surgery
• /
• v.17 no.2
• /
• pp.96-98
• /
• 2016