Three-dimensional finite element model was made from adult skull to find desirable direction of retraction force to treat skeletal class II malocclusion. The retraction force of 400g was applied to the first molar. The direction of the force application was 23degrees downward, parallel, 23degrees upward and 45` upward to the occlusal plane. The stress distribution and the displacement within the maxilla were analyzed by three-dimensional finite element method. The findings obtained were as follows: 1. Maxillary first molar was displaced posteriorly and inferiorly in 23degrees downward, parallel, 23degrees upward retraction but it was displaced posteriorly and superiorly in 45degrees upward retraction. 2. ANS, A point and prosthion were moved posteriorly and inferiorly and pterygornaxillary fissure was moved posteriorly and superiorly. Clockwise rotation of maxilla occurred when retraction force was applied. 3. The degree of clockwise rotation of maxilla was greatest when the force was applied 23degrees upward to the occlusal plane and was least when the force was applied 23degrees downward to the occlusal plane. 4. Large tensile stress appeared in maxillary first molar and alveolar bone and the infraorbital region of maxilla when the force was applied 23degrees downward to the occlusal plane. Tensile stress was smaller as the direction of force move upward. 5. Large compressive stress was appeared in maxillary first molar and infraorbital region in 45degrees upward case and large compressive stress occurred in the posterior part of maxilla as the retraction force was upward.
Adult ; Dental Occlusion ; Humans ; Malocclusion ; Maxilla* ; Molar ; Skull

It is generally recognized that several chemical mediators are involved in tbe pathogenesis of sunbum; however, the exact mechanism is still to he resolved. Recently, prostaglandin has been found to be one of the inflammatory mediators in sunbum, particularly in the delayed erythema response and several investigators have shown that the nonsteroidal antiinflammatory drugs inhibit the in vivo synthesis of prostaglandin. On the assumption that the nonsteroidal antiinflammatory drugs might exert a beneficial effect on the sunbum through the antiprostaglandin effect, several authors have reported the effect of indomethacin on sunbum. This study was undertaken to evaluate the effect of topical indomethacin on the delayed erythema response induced by artificial sunlamp and sunlight by clinical and histopathological examination. Indomethacin(2. 5% ointment, 2. 5% solution, 5% solution) was applied immediately after 3 MED irradiation of artificial sunlamp to the shaved back skin of 6 healthy albino guinea pigs weighing 550-850gm and 9 human volunteers and the delayed erythema response was observed at 2, 4, 6, 12, 24 and 48 hours after irradiation respectively. Punch biopsies of the skin were performed on 6 guinea pigs at 6, 12, 24 a.nd 48 hours after irradiation and the histologic changes were observed. Four human volunters were exposed t,o 3 MED of sunlight and indomethacin preparations were applied immediately after irradiation. The delayed erythema response was observed at 2, 4, 6, 12, 24 and 48 hours postirradiation and in one volunteer, the skin was biopsied at 24 hour for histologi.c evaluation. The results were as follows: 1. Topical indomethacin in ointment or solution forms delayed and decreased the appearance and degree of erythema induced by sunlight and artificial sunlamp in both human and animal subjects. 2. Histologically, the number of sunbum cells at 24 hour in the epidermis of one human volunteer was decreased on indomethacin applied sites. The dermis showe6 no difference in histologic changes between control and indomethacin sitea. In animal study, however, no detectable difference in epidermal or dermal changes was observed between control and indomethacin applied sites. The autors confirmed that topical indometha,cin was effective in delaying and blanching of the delayed erythema of sunbum in guinea pigs as well as in human volunteers, though there was no difference in histologic changes between indomethacin and control sites in guinea pigs. The mechanism involvel on this aspect is remained to be resolved.
Animals ; Biopsy ; Dermis ; Epidermis ; Erythema ; Guinea Pigs ; Healthy Volunteers ; Humans ; Indomethacin* ; Research Personnel ; Skin ; Sunburn* ; Sunlight ; Volunteers

To investigate the heterogeneity of fibroblast proliferation rate depending on the depth of dermis in the psoriatic skin lesions, fibroblasts were obtained from the upper and lower dermis of the forearm skin lesions in 9 psoriatir, patients and of the comparable sites in 7 healthy persons respectively, and were cultured. The in vitro proliferation rates of the fibroblasts were calculated by measuring the efficiency af cell attachment, cell numbers on varying days of culture and the population doubling time during the 3rd passage of subculture. The results were as follows: 1, The efficiencies of cell attachment at 24 hours after seeding were not statistically different between the upper derrnal fibroblasts and the lower ones in both psoriatic skin lesions and normal skins. 2. By rneasuring the cell numbers and the population doubling times, the prolifeatior rate of the upper der mal fibroblasts was greater than that of the lower ones in both psoriatic skin lesions and normal skins and that the fibroblastic proliferation rate was significantly inereased in the psoriatic skin lesion compared to the normal skin.
Cell Count ; Dermis* ; Fibroblasts* ; Forearm ; Humans ; Population Characteristics ; Skin*

Esthetic is one of the prime goal of the orthodontic treatment. The upper incisor position in important because it is decisive in balanced smile. This study was attempted to obtain the standards and equations on the esthetic upper incisor position. Lateral cephalometric radiographs of 66 Korean young adult females who were candidates of Miss Korea Beauty Contest were traced, measured and statistically analyzed. The results were as follows ; 1. The mean and standard deviation of the measurement for upper incisor position were obtained in the Korean Beauty. 2. Among the measurements of the axis of upper incisor, 1 to SN and 1 to FH were high1y correlated with FH-MP, ANB, FH-N Pag, Y-axis, but 1 to SN (Is-Pr) to present axial inclination of labial surface of upper Incisor didn't have any correlation with the measurements for dentofacial pattern. 3. Among the measurements for the vertical position of upper incisor, 1 to stom had low correlation with to measurements for dentofacial pattern and 1 to PP(mm) was highly correlated with the measurements for facial growth direction. 4. Sixteen multiple regression equations were established to predict upper incisor position balancing with dentofacial pattern. 5. It does not have much power of persuasion to predict esthetic upper incisor position from the measurements for dentofacial pattern.
Adult* ; Beauty ; Female* ; Humans ; Incisor* ; Korea ; Persuasive Communication ; Young Adult

No abstract available.
Embryonic Structures* ; Female ; Fertilization in Vitro* ; Pregnancy ; Pregnancy, Tubal*

PURPOSE: This study was done to build and verify a model of clinical nurses' turnover intention using organizational characteristics, job satisfaction and job embeddedness. METHODS: The study participants were 389 hospital nurses. SPSS and AMOS 22.0 program were used to analyze the data and the modeling of turnover intention. RESULTS: A total of 41% of turnover intention was explained by job satisfaction, job embeddedness and organizational characteristics. Nurses with higher job satisfaction and job embeddedness showed lower turnover intention, while organizational characteristics had an indirect effect on their turnover intention. It was found that organizational characteristics had positive effects on both job satisfaction and job embeddedness, and job embeddedness played a mediating role between organizational characteristics and turnover intention. CONCLUSION: To reduce nurses' turnover intention, hospitals' organizational characteristics should be considered. Nurse managers should strive to increase nurses' job satisfaction and job embeddedness through an understanding of the factors of organizational characteristics such as organizational fairness, nursing work environment, motivation, organizational citizenship behavior, and transformational leadership.
Health Facility Environment ; Humans ; Intention* ; Job Satisfaction* ; Leadership ; Models, Structural* ; Motivation ; Negotiating ; Nurse Administrators ; Nursing ; Organization and Administration ; Personnel Turnover

This dental anthropological study was performed to analyse male and female students of Che-ju high school students. Cephalometric X-rays and dental casts were obtained of 60 male and 60 female students and the Mean and Standard Deviation were obtained. There was no difference in craniofacial morphology between male and female students but the size of craniofacial skeleton of the male is bigger than that of the female. The distance from NB line to pogonion is longer in the male group, and it meant that mandibular symphysis of the male is well developed than the female. The size of teeth of the male is larger than that of the female and is significant in upper and lower canine and first molar. The size of upper arch width, intercanine width, basal arch width and lower basal arch width of the male is larger than that of the female, but arch length of the male and the female showed no significant difference.
Female ; Humans ; Jeju-do* ; Male ; Molar ; Skeleton ; Tooth

No abstract available.

No abstract available.

No abstract available.
Cerebral Hemorrhage* ; Eclampsia* ; Female ; Pregnancy