The purposes of this study were to clarify the effect of tooth size and arch size upon the crowding. 175 upper casts were measured and following conclusions were made. 1. Tooth size, intermolar width, 2nd premolar width of crowded group were not significantly different from those of noncrowded groups. 2. Intercanine width, arch length of noncrowded group were significantly larger than crowded group. 3. Multiple regression equations were derived by using tooth size, arch perimeter, arch length, intermolar width.
Bicuspid ; Crowding* ; Dental Arch* ; Statistics as Topic* ; Tooth*

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Humans ; Nurseries*

No abstract available.
Diabetes Mellitus, Type 1* ; Echocardiography*

The purpose of this study was to observe the tissue response to the orthodontic force applied immediately after buccal horizontal subapical osteotomy of maxilla. Five mongrel cats weighing about 2.5 Kg were used for this experiment. The left upper canine and premolar of each cat served as a experimental side and the right ones as a control side. On the experimental side, a 100gm orthodontic force was applied between the upper canine and premolar immediately after the osteotomy. On the control side, the same orthodontic force was applied without the osteotomy. After 7days, the experimental animals were sacrificed. The results were as follows: 1. In the pressure zones of the experimental group, significant increase of osteoclasts and direct resorption along the alveolar bone surface was observed as compared with those of the control group. 2. In the pressure zones of the experimental group, a less extensive hyalinized zone was observed than those of the control group. 3. In the pressure zones of both group, no root resorption was found. 4. In the tension zones of the experimental group, new bone deposition increased along the alveolar bone surface as compared with those of the control group. In conclusion, the results suggest the possibility that early orthodontic treatment after orthognathic surgery may have some benefits if the stability of the repositioned segment at surgery is secured.
Animals ; Bicuspid ; Cats ; Hyalin ; Maxilla* ; Orthognathic Surgery ; Osteoclasts ; Osteotomy* ; Root Resorption

As the result of the study concerning "bone inducibility of chitosan", 1. "BMP-2"was observed mainly through the test when the "osteoblast"is exposed to the "chitosan". The expression of BMP-2 was 542.63 times compared to control after 2 hours exposure and it was maintained 16.60 times till 24 hours. 2. The expression of BMP-4 was decreased compared to control during exposure. 3. The expression of BMP-7 revealed two peaks during exposure. 4. The expression of osteocalcin was increased in early phase, and then decreased. Although it is not clear whether the "chitosan"is clinically effective material as a "bone induction material", we could say that it has a function for bone induction. Further detailed study will be required.
Bone Morphogenetic Protein 7 ; Chitosan* ; Humans* ; Osteoblasts* ; Osteocalcin

There has been so much controversies about the position of upper and lower jaws, and their first permanent molars in normal occlusion and Angle's class I,II,III malocclusions. So, the purpose of this study is to compare the position of upper and lower jaws, and their first molars in normal occlusion and Angle's class IIIIII malocclusions by lateral cephalometric analysis. The sample consisted of one hundred and twenty girls(thirty in each group) who had completed growth. The findings of this study were as follows: 1. In class I malocclusion, both maxilla and mandible were slightly posterior position than normal occlusion, but they showed harmonious relationship. 2. In class II malocclusion, the mandible was greatly retruded, and the maxilla was also slightly retruded to the cranial base as compared with normal occlusion. 3. In class III malocclusion, the maxilla was significantly retruded to the cranial base, but no significant difference was found in mandibular position as compared with normal occlusion. 4. The maxillary first molar was located at posterior position in class II malocclusion, and anterior position in class III malocclusion to the cranium, so that the rotation of mandible was influenced by that. 5. The mandibular first molar showed constant relationship to the mandible in all four groups, but different position to the cranial base in direct proportion to the mandibular position. 6. On the treatment planning of class II malocclusion, it seems to be better to promote the mandibular horizontal growth by inhibiting the vertical growth of maxillary molar area, and on the treatment planning of class III malocclusion, it seems to be better to promote the antero-inferior growth of maxilla and to promote the mandibular vertical growth by inducing the vertical growth of maxillary molar area.
Jaw* ; Malocclusion* ; Mandible ; Maxilla ; Molar* ; Skull ; Skull Base

PURPOSE: Accurate diagnosis and prompt treatment of infection with Streptococcus pyogenes (group A streptococci) is required as it may cause many complications, and chronic serious sequelae, acute rheumatic fever and acute glomerulonephritis. Recently, the assay methods of ASO concentration tend to be changed into quantitatively from semi-quantitative or qualitative methods in this country. We would like to know relationships and degree of concurrences between two methods. METHODS: Total eighty-three elementary school children, aged from 7 to 8, were involved for this study. They had been examined throat swab culture with conventional methods and letting down the blood for measuring ASO titer simultaneously. We examined ASO titer by both Rantz-Randall method and Nephelometry. RESULTS: The correlation between a semi-quantitative ASO assay by Rantz-Randall (X) and a quantitative ASO assay by Nephelometry (Y) was Y=1.69X+76.7 (r=0.81). Compared to the Nephelometry test, Rantz-Randall test showed a sensitivity of 72.7% and specificity of 100%. Accordingly, the concordance rate of two methods was 89.2%. CONCLUSIONS: There seems to be high correlation and concordance rate between Rantz-Randall and Nephelometry. It needs to be changed methods for ASO titer measurement from semi-quantitative to quantitative methods for reducing possible laboratory error and for reliable standardization. Altogether, interpretation of ASO titer should be on the ASO value of different geographic areas, in different seasons, and year by year.
Antistreptolysin ; Child ; Diagnosis ; Glomerulonephritis ; Humans ; Linear Energy Transfer ; Nephelometry and Turbidimetry* ; Pharynx ; Rheumatic Fever ; Seasons ; Sensitivity and Specificity ; Streptococcus pyogenes