The purpose of this study was to investigate the stress distribution of the abutment and supporting tissues according tot he slopes and types of the guiding plane of distal extension removable partial dentures. The 3-dimensional finite element method was used and the finite element models were prepared as follows. Model I : Kratochvil type guiding plane with 90degree to residual ridge Model II : Kratochvil type guiding plane with 95degree to residual ridge Model III : Kratochvil type guiding plane with 100degree to residual ridge Model IV : Krol type guiding plane with 90degree to residual ridge Distal extension partial denture which right mandibular first and second molar were lost was used and the second premolar was prepared as primary abutment with RPI type retainer. Then 150N of compressive force was applied to central fossae of the first and second molars and von Mises stress and displacement were measured. The results were as follows : 1. Model I and Model IV showed a similar stress distribution pattern and the stress was concentrated on the apex of the root of the abutment. 2. The stress was increased and concentrated on mesial side of the root of the abutment in Model II. The stress was concentrated on buccal and mesiobuccal side of the root of the abutment in Model III. 3. In Model I, the root of the abutment displaced and twisted a little in clockwise. In Model IV, the root of the abutment displaced to distolingually at apical region of the root and mesiobucally at cervical region of the root. 4. In Model II, the root of the abutment displaced to mesiolingually at apical region of the root and more displaced and twisted in counterclockwise at cervical region of the root. In Model III, the root of the abutment displaced to mesiobucally at apical region of the root and more displaced and twisted in clockwise at cervical region of the root.
Bicuspid ; Denture, Partial ; Denture, Partial, Removable* ; Molar

The midface are bounded by a line connecting the two zygomaticofrontal suture, passing through the frontomaxillary and frontonasal suture, and limited below by the occlusal plane of maxillary teeth. Midface fractures include fractures affecting the maxilla, the zygoma, and the nasoorbital ethmoid complex. Midface fractures can be classified as LeFort 1, II, III fractures, sygomaticomaxillary complex fractures, zygomatic arch frationctures, or nasoorbital ethmoid fractures. These injuries may be isolated or occur in combine. And sort tissue injuries to the facial structures are commonly encountered in the treatment of midface fractured patient. Soft tissue wounds may be limited to the superficial structures, but more serious injuries may extend to involve anatomic structures such as the sensory and motor nerves of the face; the parotid, or nasolacrimal glands or ducts ; or the dentoalveolar structures. Especially, these fractures are combined with the orbit, brain injuries and skull base fractures. This is to report the incidence, causes, criteria, complication and treatments of patients who visited our department for midface fracture, for last 10 years.
Brain Injuries ; Dental Occlusion ; Humans ; Incidence ; Maxilla ; Orbit ; Skull Base ; Sutures ; Tooth ; Wounds and Injuries ; Zygoma ; Zygomatic Fractures

While the microbiology of cellulitis in the pediatric population and systemic diseases(DM, Cirrhosis, etc) is well known,the causative bacteria and clinical aspect of cellulitis in young adults are less descrihed. this study was undertaken to identify the causative organisms and clinical aspect of adult cellulits. We analysed 121 medical records of 115 young adult patients with cellulitis who had been admitted at the department of orthopaedic surgery, National Police hospital from Jan. 1994. to Dec. 1996. The results were as follows. 1. The age of patient was between 21 yrs and 25 yrs, and the sex of all patients was male. 2. The lower leg and foot were the most frequently involved site of cellulitis as 92 cases(74.2%). 3. The potals were suspected in 65 cases(56.5%),of them, traumas were detected in 43 cases(66.1%), non-traumatic skin lesions in 23 cases(33.9%). 4. In most cases, initial systemic symptoms (fever, chill, headache, etc.) and local symptoms (local heating, tenderness, etc.) were found. 5. The laboratory findings revealed leukocytosis in 19%, elevated ESR in 94%, positive CRP in 80%. 6. Microorganism were detected in 16 of 38 pus cultures. Gram positive microorganisms were detected in 15 of 16 cases culture positive. 7. 6.7% of patients with cellulitis experienced recurrence in same lesions. In conclusion, the retrospective analysis of 115 young adult patients with cellulitis showed that primary cause of young adult cellulit was circulatory disturbance and lymphatic obstruction of the lower extremities most often involved by trauma. therefore, supportive treatments such as rest,elevation,ice packs are considered prior to antibiotic treatment.antibiotic treatment aimed at gram-positive cocci appears to be sufficient.
Adult ; Bacteria ; Cellulitis* ; Fibrosis ; Foot ; Gram-Positive Cocci ; Headache ; Heating ; Hot Temperature ; Humans ; Leg ; Leukocytosis ; Lower Extremity ; Male ; Medical Records ; Police ; Recurrence ; Retrospective Studies ; Skin ; Suppuration ; Young Adult*

Over the physiologic range of heart rate, the duration of electrical systole(QT) is shorter than that of electromechanical systole(QS2), which reflects direct physiologic link between electrical repolarization and mechanical events of the cardiac cycle. The present study designed to test usefulness of systolic time intervals and QT-QS2(QT minus QS2) value as complication predictors, which may predict prognostic status of myocardial infarction. The studied subjects were consisted of 33 healthy adults as control(22 men, 11 women) and 35 patients with myocardial infarction. And studied patients were divided into 3 groups; group I of 14 patients with or without complication in acute stage, group II of 11 uncomplicated patients under recovery of chronic status, group III of 10 complicated patients under recovery or chronic status. The observation periods were 3 to 13 days in group I, 5 to 96 weeks in group II and III after their onset. The results were follows; 1) The normal ranges were defined as mean+/-2 standard deviations of the measured values of control, that of QTc were shorter than 431ms of man and 458ms of woman, that of QS2 I were longer than 503ms of man and 514ms of woman, that of PEP/LVET ratio was less than 0.40, that of QT-QS2 value was less than 0 ms respectively. 2) QTc of all patient groups were significantly prolonged compared with that of control, and that of group III was significantly longer than that of group II(481+/-25 vs 432+/-32, p<0.005). 3) The changes of QS2 I were not significant in all patient groups compared with QS2 I of control. 4) QT-QS2 value showed QT>QS2 in group I and III. and QTQS2 had positive predictive value of 82% for predicting probability of previous complicated status. We concluded that QT-QS2 value, including PEP/LVET ratio and QTc, could be used as complication predictors. But it is necessary to examine these indicators prospectively to confirm its clinical applicability.
Adult ; Female ; Heart Rate ; Humans ; Male ; Myocardial Infarction* ; Reference Values ; Sensitivity and Specificity ; Systole*

Although varying types of cystic lesion, true to false, in the spinal cord have been described, spinal enterogenous cyst is a rare condition. It is considered as a result of congenital remnant of primitive foregut. The authors experienced a case of a spinal enterogenous cyst in the intradural space along the fouth, fifth and sixth cervical spine, occurred in a twenty-seven years old male patient. The cyst was composed of hyalinized fibrous wall with single layered lining epithelium, such as simple non-ciliated cuboidal epithelium or ciliated tall columnar epithelium with focal mucinous columnar epithelium.
Male ; Humans ; Cysts

No abstract available.

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No abstract available.
Radiosurgery* ; Trigeminal Neuralgia*

No abstract available.
Anesthesiology* ; Education* ; Publications*

No abstract available.
Prognathism