This study was designed to evaluate the relationship of mandibular condylar position to overbite depth and compare the findings from transcranial radiographs and those from individualized corrected tomographs in determination of condylar position. The subjects consisted of 20 control subjects (male 8, female 12), and 10 open-bite patients (male 3, female 7) and 23 deep-bite patients (male 17, female 6). The mean age was 23.3 years for the control group, 21.5 years for open-bite group, and 23.2 years for deep-bite group. Transcranial radiographys and individualized corrected tomographys in centric occlusion were taken from right and left temporomandibular joints of each subject. The results were as follows. 1. In the 20 normal subjects showing no symptoms of TM disorder, the incidence of condylar retrusion was 27.5%, middle condylar position 60.0%, and anterior displacement 12.5%. 2. There was significant correlation between the bite depth and observed condylar position. 3. Only 45.2% of the findings from transcranial radiographs coincided with those from individualized corrected tomographs in determining condylar position.
Female ; Humans ; Incidence ; Overbite* ; Temporomandibular Joint

The purpose of this report is to present the cause and treatment of posterior open bite. Posterior open bite is the open bite limited to posterior teeth. These problem usually are attributed to a mechanical interference with the eruption process, either ankylosis or some soft tissue interference. But, in some patient, lateral open bite is due to a disturbance of the eruptive mechanism itself and other disease or side effect following other treatment. Distinguishing cause of posterior open bite, lack of eruption due to some external interference with eruption or primary failure of eruption mechanism, is important clinically because this determines the prognosis for orthodontic treatments. The characteristics, differential diagnosis with posterior open bite due to other etiologies and the treatment of these problems are presented and discussed.
Ankylosis ; Diagnosis, Differential ; Humans ; Open Bite* ; Prognosis ; Tooth

Recently, straight-wire appliance is widely used with great concern in clinical orthodontic field. The purpose of this study was to collect the information of the straight-wire appliance and to determine the crown inclination in clinical orthodontics. The author analyzed the study model of 78 individuals with normal occlusion. The obtained results were as follows. 1. Mean, maximum value, minimum value and standard deviation of crown inclination of upper and lower teeth were obtained. 2. The lingual crown inclination of upper tooth had constant value from first premolar through second molar, the lingual crown inclination of lower tooth progressively increased from canine through second molar 3. As Howes' ratio was decreased, the crown inclination of upper incisors was increased. 4. Narrowing the upper arch, the crown inclination of upper incisors was increased.
Bicuspid ; Crowns* ; Incisor ; Molar ; Orthodontics ; Tooth

No abstract available.

As gastroduodenoscopy performed more frequently, case reports of human echinostomiasis are increasing in Korea. A Korean woman presented at a local clinic with complaints of abdominal pain and discomfort that had persisted for 2 weeks. Under gastroduodenoscopy, two motile flukes were found attached on the duodenal bulb, and retrieved with endoscopic forceps. She had history of eating raw frog meat. The two flukes were identified as Echinostoma hortense by egg morphology, 27 collar spines with 4 end-group spines, and surface ultrastructural characters. This report may prove frogs to be a source of human echinostome infections.
Animals ; Duodenal Diseases/*parasitology ; Duodenum/*parasitology ; Echinostoma/*isolation & purification ; Echinostomiasis/*diagnosis ; Endoscopy ; Female ; Humans ; Korea ; Middle Aged

The author compared patients with extreme variations in MP-SN angle with normal group in order to examine the relationship between the MP-SN angle and other skeletal and dental parameters. The results were as follows; 1. The OP-SN angle and OP-MP angle decreased as the MP-SN angle decreased. 2. As the MP-SN angle decreased, the skeletal and dental components became more anteriorly situated. 3. In high MP-SN group, TFH, UFH, LFH, OP-MP, ADH increased nore than those in average MP-SN group. 4. The RH/TFH ratio decreased as the MP-SN increased.
Humans

Retraction of canines represents a fundamental stage in a considerable number of orthodontic treatment. Correct position of the canine after retraction is most important for function, stability, and esthetics. The purpose of this study was to investigate the stress in the periodontal tissue at the initial phase during canine retraction using various types of sectional retraction springs, by finite element method. Three dimensional model of tooth, periodontal ligament, bone and eight springs were simulated and tested. The following results were obtained. 1. In sectional retraction springs, increasing number of helix and the closed loop in preference to the open loop provided an decrease in horizontal force. Without angulating the arms of spring, the T-loop revealed the highest Moment-to-force ratio. 2. The Moment-to-force ratio raised by angulating mesial and distal arms of spring, but very large horizontal force was applied to canine. 3. When optimal force and optimal moment was applied to canine, the stress induced was homogeneous and the difference of stress value from cervix to the apex was little.
Arm ; Cervix Uteri ; Esthetics ; Female ; Periodontal Ligament ; Tooth

The purpose of this study was to analyze the stress distribution and the displacement in the maxillary complex after the application of the reverse headgear. The direction of force was parallel to the occlusal plane. Orthopedic force, 300gm, was applied to the maxilla of the dry human skull in a forward direction. The stress distribution and the displacement within the maxillary Complex was analyzed by a 3-dimensional finite element method. The results were as follows: 1. The stress distribution at the molar regron was greater than that at the anterior. 2. The stress distribution at the lateral side of the premaxilla was greater than that at the middle side, especially high stress was noted at the canine eminence. 3. Compressive stress was noted only at the forntozygomatic suture of the zygomatic arch. 4. A forward, upward, and sideward displacement was noted at the entire nodal points of the zygomaticomaxillary suture portion. A displacement with a slight rotation was observed on the transverse palatine suture. 5. The maximum stress was observed at the lateral side of the maxillary tuberosity area, and generally the forward and downward displacement was noted at all this area.
Dental Occlusion ; Finite Element Analysis* ; Humans ; Maxilla ; Molar ; Orthopedics ; Skull ; Sutures ; Zygoma

The purpose of this study is to investigate factors related to the intent of using home nursing of chronic disease patients who got out of a university hospital. For the purpose. the study selected 153 patients who were hospitalized and left K university hospital with diagnoses of cancer. hypertension. diabetes and cerebral vascular accident and ordered to be discharged and performed interviews with them and surveys on their medical records to obtain the following results. For this study a direct-interview survey and medical record review was conducted from June 28 to Aug. 30. 1998. The frequency and mean values were computed to find the characteristics of the study subjects. and chi-test. t-test. factor analysis and multiple logistic regession analysis were applied for the analysis of the data. The following results were obtained. 1) When characteristics of the subjects were examined. men and women occupied for 58.8 % and 41.2 %. respectively. The subjects were 41.3 years old in average and had the monthly average earning of 0.99 million won or below. which was the most out of the total subjects at 34.6 %. Among the total. 87.6% resided in cities and 12.4 in counties. The most left the hospital with diagnosis of cancer at 51.6 %. followed by hypertension at 24.2%. diabetes at 13.7% and cerebral vascular accident at 7.2%. 2) 93.5% of the selected patients had the intent of using home nursing and 6.5%. didn't. Among those patients having the intent. 85.6% had the intent of paying for home nursing and 14.4%. didn't. The subjects expected that the nursing would be paid 9.143 won in average and 47.7 % of them preferred national authorities as the mam servers. 86.3% of the subjects thought that home nursing business had the main advantage of making it possible to learn nursing methods at home and thereby contributing to improving the ability of patients and their facilities to solve health problems. 3) Relations between the intent of use and characteristics of the subjects such as demography-related social. home environment. disease and physical function characteristics did not show statistically significant differences among one another. Compared to those who had no intent of using home nursing. the group having the intent had more cases of male patients. the age of 39 or below. residence in cities. 5 family members or more, no existence of home nursing servers, leaving the hospital from a non-hospitalized building, disease development for five months or below, hospitalization for ten days or more, non-hospitalization within the recent one month, two times or over of hospitalization, leaving the hospital with no demand of special treatment, operation underwent, poor results of treatment, leaving the hospital with demand of rehabilitation services, physical disablement and high evaluation point of daily life. 4) Among those patients having the intent of using home nursing, 47.6% demanded technical nursing and 55.9%, supportive nursing. As technical nursing, 'inject into a blood vessel' and 'treat pustule and teach basic prevention methods occupied for 57.4%, respectively, topping the list. Among demands of supportive nursing, 'observe patients' status and refer them to hospitals or community resources as available, if necessary' was the most with percentage point of 59.5. Regarding the intent of paying for home nursing, 39.2% of those patients wishing to use the nursing responded paying for technical services and 20.2, supportive services. In detail. 70.0% wanted to pay for a service stated as 'inject into a blood vessel' , highest among the former services and 30.7%, a service referred to as 'teaching exercises needed to make the body of patients move', highest among the latter. When this was analyzed in terms of a relation between the need(the need for home nursing) and the demand(the intent of paying for home nursing), The rate of the need to the demand was found two or three times higher in technical nursing(0.82) than in supportive nursing(0.35). In aspects of technical nursing, muscle injection(0.26, the 1st rank) was highest in the rate while among aspects of supportive nursing. a service referred to as 'teach exercises needed for making patients move their bodies normally' (0.58, the 1st rank). 5) factors I(satisfaction with hospital services), II(recognition of disease state), III(economy) and IV(period of disease) occupied for 34.4, 13.8, 11.9 and 9.2 percents, respectively among factors related to the intent by the subjects of using home nursing, totaled 59.3%. In conclusion, most of chronic disease patients have the intent of using hospital-based home nursing and satisfaction with hospital services is a factor affecting the intent most. Thus a post-management system is needed to continue providing health management to those patients after they leave the hospital. Further, supportive services should be provided in order that those who are satisfied with hospital services return to their community and live their independent lives. Based on these results, the researcher would make the following recommendation. 1) Because home nursing becomes more and more needed due to a sharp increase in chronic disease patients and elderly people, related rules and regulations should be made and implemented. 2) Hospital nurses specializing in home nursing should be cultivated.
Aged ; Chronic Disease ; Commerce ; Diagnosis ; Exercise ; Female ; Home Nursing* ; Hospitalization ; Humans ; Hypertension ; Male ; Medical Records ; Nursing ; Rehabilitation ; Social Control, Formal

Upper canine is described as 'cornerstone' of maxilla, and its importance is implicated by long root and good alveolar support, The incidence of impaction of upper canine is the second most frequent next to the third molar because it takes a long period of time to develop, and has a complicated path of eruption, and erupts lately. Generally, the patient who has a palatally impacted canine visit the clinic primarily due to a missing of canine after 12-13 years old. Palatally impacted canine is different from labially impacted canine in its cause and treatment process, It is due to malposition or anomalous lateral incisor rather than arch length deficiency. Once the impaction is identified, the first stage of the treatment is to localize the lesion by radiographic examinations or others and according to severity, orthodontic traction, or transplantation should be considered, and comprehensive diagnosis and treatment plan of malocclusion should be established, Properly managed impacted canine can provide funtion and esthetic through proper diagnosis and treatment of extraction of canine is not indicated.
Diagnosis ; Humans ; Incidence ; Incisor ; Malocclusion ; Maxilla ; Molar, Third ; Traction