PURPOSE: The objective of this study was to evaluate the possibility of substitution of the zonography for the full-mouth periapical radiography in aspect of radiation protection. MATERIALS AND METHODS: Rando phantom and LiF TLD chips were used for dosimetry. The absorbed doses at brain, skin above the TMJ, parotid gland, bone marrow in the mandibular body, and thyroid gland during the full-mouth periapical radiography, panoramic radiography, and zonography were measured. RESULTS: From the zonography, the absorbed doses to the brain, the skin over the TMJ, and the parotid gland were relatively high, but the absorbed doses to the bone marrow in the mandibular body and, especially, the thyroid gland were very low. CONCLUSION: The zonography can be an alternative to the full-mouth periapical radiography in aspect of radiation protection.
Bone Marrow ; Brain ; Parotid Gland ; Radiation Protection ; Radiography* ; Radiography, Panoramic* ; Skin ; Temporomandibular Joint ; Thyroid Gland ; Tomography, X-Ray*

PURPOSE: The objective of this study was to compare clinical examination of of dental caries and secondary caries with panoramic examination, and to examine bone lesions and dental anomaly of unerupted state. MATERIALS AND METHODS: In this study, clinical records and panoramic radiographs were available for 89 first grade students in elementary school. Dental caries of occlusal surfaces, proximal surfaces, and buccolingual surfaces were examined . Secondary caries was examined too. In addition, the central lesion and dental anomaly of unerupted state were examined in panoramic radiographs. RESULTS: The obtained results were as followed : 1. Carious detectability of clinical examination in occlusal and buccolingual surface was higher than that of panoramic examination, but it is statistically insignificant(p>0.05). In proximal surface, carious detectability of panoramic examination was higher than that of clinical examination, and it is statistically significant(p<0.01). 2. In contrast to clinical examination only, when the two examination methods were combined, there was additional detection of dental caries(26.7% in occlusal surface, 48.2% in proximal surface, 33.3% in buccolingual surface, and 38.3% totally). 3. In detection of secondary caries, panoramic examination had lower ability than clinical examination in all three surfaces, but in case that both methods were combined, totally 36.0% extra carious lesions were detected. 4. In panoramic examination, detectability of secodary caries in upper teeth is lower than lower teeth. 5. In panoramic examination, it was possible to detect the central lesions and dental anomalies of unerupted state which cannot be detected in clinical examination. CONCLUSION: It is useful to combine the panoramic examination with clinical examination in order to increase carious detectability and to evaluate the central lesions and dental anomalies of unerupted state
Dental Caries* ; Diagnosis* ; Humans ; Radiography, Panoramic* ; Tooth

No abstract available.
Cytomegalovirus Infections* ; Cytomegalovirus* ; HIV Infections* ; HIV* ; Humans

We report a case of pilomatrixoma presenting in the right cheek of a 6-year-old girl. In the panoramic view, a small, ovoid-shaped, and nonhomogenous calcified mass was superimposed on the right mandibular angle. The mass was located on the skin overlying the right mandibular ramus area in the skull P-A view. The tumor had a strongly reflective pattern with acoustic shadowing in sonographic view. We also illustrate how these lesions can be effectively diagnosed.
Acoustics ; Cheek* ; Child ; Female ; Humans ; Pilomatrixoma* ; Shadowing (Histology) ; Skin ; Skin Neoplasms ; Skull ; Ultrasonography

PURPOSE : To assessment the angle between mandibular canal and occlusal plane at each posterior tooth region and location of mental foramen on the panoramic radiographs. MATERIALS AND METHODS : This study analysed 46 half-mandibles of panoramic radiographs. Inferior border of mandibular canal was traced. Occlusal plane was drawn from lingual cusp tip of the first premolar to distolingual cusp tip of the second molar. Perpendicular line from occlusal plane was drawn at each tooth region and then tangential lines were drawn from the crossing points at canal. the angle between occlusal plane and tangential line was measured. The location of mental foramen was also studied. According to the location of mental foramen, radiographs were divided into M (mesial) group and D (distal) group on the basis of the second premolar. and then inter-group analysis about mandibular canal angle was done. RESULTS : The angles of mandibular canals were -17.7 degrees, -9.5 degrees, 8.2 degrees, 22.3 degrees, and 39.2 degrees at first premolar, second premolar, first molar, second molar, and third molar, respectively. The commonest position of the mental foramen was distal to the second premolar. Inter-group comparison showed statistically significant difference at the second premolar and the first molar (p<0.001). CONCLUSION : The acknowledgement of mandibular canal angulation and location of mental foramen can help understanding the course of mandibular canal.
Bicuspid ; Dental Occlusion ; Mandibular Nerve ; Molar ; Molar, Third ; Radiography, Panoramic ; Tooth

Cryptococcosis is a subacute or chronic mycotic infection caused by cryptococcus neoformans with a special predilection for the lung, skin and central nervous system, but rarely involving the lymphatic system. Recently the authors have experienced two patients with cryptococcosis in volving the liver and lymph nodes. One was 31/4year old male and the other was 11 year old male. The former had suffered from severe abdominal pain since about 1 month ago and high fever developed 10days before admission. On physical examination, jaundice and hepatomegaly were noted with enlarged and tender lymph nodes in the neck and inguinal region. Bone marrow aspiration revealed increased cellularity with eosinophilia. Lymph node and liver biopsy specimens showed mand granulomas including epithelioid cells and Langhan's type giant cells containing numerous cryptococci. The budding cryptococci were also found in the cerebrospinal fluid prepared with India ink. The latter patient was admitted with the chief complaint of high fever and neck mass which had developed one week ago. On physical examination, enlarged lymph nodes were noted in the neck. But hepatomegaly or splenomegaly was not found. Lymph node bisopsy specimen revealed the same findings with the former case. They were treated with Amphotericin B with some improvement, but as the wre discharged because of poor economic condition the were not sufficiently followed up.
Abdominal Pain ; Amphotericin B ; Biopsy ; Bone Marrow ; Central Nervous System ; Cerebrospinal Fluid ; Child* ; Cryptococcosis* ; Cryptococcus neoformans ; Eosinophilia ; Epithelioid Cells ; Fever ; Giant Cells ; Granuloma ; Hepatomegaly ; Humans ; India ; Ink ; Jaundice ; Liver ; Lung ; Lymph Nodes ; Lymphatic System ; Male ; Neck ; Physical Examination ; Skin ; Splenomegaly

PURPOSE: The aim of present study is to estimate the relationship among reference lines used for taking the extraoral radiography and panoramic radiography. MATERIALS AND METHODS: Lateral cephalographs of 40 adults, aged 22 to 30 years were taken. Angles between reference lines (Frankfort line, canthomeatal line, infraorbitomeatal line, and occlusal plane) were measured. RESULTS: Angles between Frankfort line and canthomeatal line, Frankfort line and infraorbitomeatal line, Frankfort line and occlusal plane, canthomeatal line and infraorbitomeatal line, canthomeatal line and occlusal plane, and infraorbitomeatal line and occlusal plane were 16.1degrees(+/-2.2), 5.8degrees(+/-2.4), 8.7degrees(+/-3.5), 10.3degrees(+/-1.3), 24.8degrees(+/-4.0), and 14.5degrees(+/-4.4), respectively. CONCLUSION: Angle between frankfort and canthomeatal line is very different with commonly known angle. Frankfort horizontal reference lines used for panoramic radiography need an exact definition and more accurate standard is needed for the taking of panoramic radiograph
Adult ; Cephalometry ; Dental Occlusion ; Humans ; Radiography* ; Radiography, Panoramic

PURPOSE: The purpose of this study was to evaluate comparison of static MRI and pseudo-dynamic (cine) MRI in temporomandibular joint (TMJ) disorder patients. MATERIALS AND METHODS: In this investigation, 33 patients with TMJ disorders were examined using both conventional static MRI and pseudo-dynamic MRI. Multiple spoiled gradient recalled acquisition in the steady state (SPGR) images were obtained when mouth opened and closed. Proton density weighted images were obtained at the closed and open mouth position in static MRI. Two oral and maxillofacial radiologists evaluated location of the articular disk, movement of condyle and bony change respectively and the posterior boundary of articular disk was obtained. RESULTS: No statistically significant difference was found in the observation of articular disk position, mandibular condylar movement and posterior boundary of articular disk using static MRI and pseudo-dynamic MRI (P>0.05). Statistically significant difference was noted in bony changes of condyle using static MRI and pseudo-dynamic MRI (P<0.05). CONCLUSION: This study showed that pseudo-dynamic MRI didn't make a difference in diagnosing internal derangement of TMJ in comparison with static MRI. But it was considered as an additional method to be supplemented in observing bony change.
Humans ; Joints* ; Magnetic Resonance Imaging* ; Magnetic Resonance Imaging, Cine ; Mouth ; Protons ; Temporomandibular Joint ; Temporomandibular Joint Disorders

PURPOSE: This study was carried out to investigate the effect of irradiation on the expression of proliferating cell nuclear antigen (PCNA) and apoptosis induction during the carcinogenesis in hamster buccal pouch. MATERIALS AND METHODS: Three months old Syrian golden hamsters were divided into control and 2 experimental groups. Hamsters in control group were left untreated on buccal pouchs. Twenty four hamsters were treated with 0.5% DMBA tri-weekly on the right buccal pouch. Forty eight hamsters were treated with 0.5% DMBA tri-weekly and irradiated with the dose of 5 Gy and 10 Gy at 6, 9, 12, 15 weeks after DMBA application. Resected buccal pouches were sectioned and examined for potential expression pattern of PCNA and apoptosis. RESULTS: The PCNA index was increased with the stages of buccal pouch epithelium carcinogenesis except the hyperplasia stage in control group (p<0.05). The irradiation did not effect on the PCNA index in the dysplasia and the carcinoma in situ stage, but in the hyperplasia stage, the PCNA index was increased with 10 Gy radiation and decreased in the carcinoma stage (p<0.05). The apoptotic index was significantly decreased from the carcinoma in situ stage and the lowest in the carcinoma stage. The apoptotic index was significantly decreased in the hyperplasia and dysplasia stage with the 5 Gy irradiation and significantly increased only in the carcinoma stage with the 10 Gy irradiation (p<0.05). CONCLUSION: The PCNA and apoptotic index were varied according to the irradiation period and dosage in each carcinogenesis stage.
9,10-Dimethyl-1,2-benzanthracene* ; Animals ; Apoptosis* ; Carcinogenesis* ; Carcinoma in Situ ; Cricetinae* ; Epithelium ; Hyperplasia ; Mesocricetus ; Proliferating Cell Nuclear Antigen* ; Radiation Dosage

PURPOSE: The purpose of this study was to investigate the apoptosis induction in tissues constituting the craniofacial region of growing rat by irradiation. MATERIALS AND METHODS: The submandibular gland, brain, articular cartilage of condylar head, and calvarium were extracted from 20-day-old rats irradiated 10 Gy. Apoptosis of each tissue was examined by DNA fragmentation and estimated quantitatively using apoptotic index on TUNEL assay. Apoptotic index of each tissue was calculated by the equation for apoptotic cells/total cells X1,000 on the images of confocal laser scanning microscopy. Apoptotic index was analyzed statistically according to the time lapse after irradiation on the tissues. RESULTS: In the submandibular gland, apoptotic index was significantly increased from 6 hours after irradiation showing the highest value at 12 hours and decreased to the control level at 3 days after irradiation. In the brain, apoptotic index was abruptly reached to the maximum value at 6 hours after irradiation and decreased to the control level at 4 days after irradiation. Articular cartilage and calvarium showed no or little apoptotic signals. The results obtained by the apoptotic index accorded with that of DNA fragmentation. CONCLUSION: Radiation was closely related with the apoptosis of submandibular gland and brain but, not related with the apoptosis of the articular cartilage of condylar head and calvarium. The changes induced by radiation of the hard tissues would not be explained by apoptosis.
Animals ; Apoptosis* ; Brain ; Cartilage, Articular ; DNA Fragmentation ; Head ; In Situ Nick-End Labeling ; Microscopy ; Microscopy, Confocal ; Rats* ; Skull ; Submandibular Gland