9 research outputs found
(A) cephalometric study about maxillofacial patterns of angle's class III malocclusions by archial analysis in Koreans
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Accurate appraisal of maxillofacial deformities in mandibular prognathism, commonly called Class β
’ malocclusion synonymously, is essential for their successful treatment by combined surgical-orthodontic technique.
Maxillofacial deformities, caused by various horizontal and vertical growth imbalances, can be evaluated by means of roentgenocephalometric analysis.
Considering the nature and balance of the individual maxillofacial components, it is more reasonable to measure the deformities by relative proportional values than by absolute quantitative ones.
In order to study the maxillofacial patterns of Class β
’ malocclusions in Koreans, mainly using archial analysis, this research covered 667 samples of cephalometric radiographs consisting of 343 of puberties(101 of whom were normal
occlusions with well-proportioned face and 242 of whom were Class β
’ malocclusions) and 324 of adults(121 of whom were normal occlusions with well-proportioned face and 203 of whom were Class β
’ malocclusions).
The conclusions are as follows;
1. In Class β
’ malocclusions, the majority of maxillofacial deformities result from mandibular characteristics rather than maxillary ones.
2. In Class β
’ malocclusions, the components which exhibit severe discrepancies are 0-B/O-A, A-Na-B, Md pl β L1, and O-Pog/O-Na.
3. With respect to the antero-posterior relationships of dental components, the posterior or nor-mal position of maxillary teeth and the normal or anterior position of mandibular teeth are the dominant combinations in puberties, whereas the normal position of maxillary teeth and the normal or anterior position of mandibular teeth are those in adults.
4. With respect to the antero-posterior relationships of skeletal components, the patterns in puberties and those in adults generally exhibit similarities, and the normal or posterior position of maxillary bone and the anterior position of
mandibular bone are dominant combinations in puberties and adults.
5. With respect to the antero-posterior and vertical relationships of skeletal components, the normal ratio of vertical component is the great prevalence in puberties, whereas the normal or increased one is that in adults, in addition to
the dominant combinations of the antero-posterior relationships of skeletal components.
6. With respect to the antero-posterior and vertical relationships of skeletodental components, all of combinations exhibit various patterns, not a typical one.
7. The patterns in puberties and those in adults are generally similar, but adults have more mandibular characteristics than puberties have.restrictio
(The) histological study on the effect of the plaster of paris on the regeneration of mandibular defects of rats
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This study was undertaken to evaluate the effect of the plaster of Paris treated on the regeneration of the mandibular bony defect.
30 rats, sprague dawley strain, weighing about 200 gm, were used, devided into control group(15 rats) and experimental group (15 rats).
The mandibular bone was penetrated with dental-grade No. 557 bur about 2mm in diameter buccolingually. In control group the blood was filed in the surgical defect. In experimental group a pellet of plaster of Paris was implanted in the surgical defect. All rats were sacrificed at 3,7,14,21, and 28 days after surgery,
and were examined histologically with light microscope.
The obtained results from this study were as follows:
1. In all of the control group and experimental group, marked acute and chronic inflammatory cells infiltration was found at the third day.
2. In control group fibrosis was found at the first week and in experimental group fibrosis and foreign body reaction was found at the only first week.
3. In all of the control group and experimental group, new bone formation was found at the second week and replaced completely with new bone at the fourth week.prohibitio
Conjoint Analysis and QFD for a Reliable Starting Point of Technology Roadmap
The purpose of the current study is to suggest a reliable starting point for roadmapping to overcome two common shortcomings of previous literatures that they do not demonstrate a robust methodology for roadmap and they describe the roadmapping process in the abstract. The proposed methodology for roadmapping considers four important business- and market-related factors: consumer requirements, engineering characteristics, the gap between the roadmapped technology and competing technologies, and future changes in consumer preferences. We capture consumer preferences using conjoint analysis and interconnect the above four factors using QFD (Quality Function Deployment). The model is applied to power line communications (PLC). The results show that there is a significant difference between priorities assigned to the engineering characteristics by expert alone and priorities determined by the roadmapping model
Diffusion of Mobile Terminal Market: A Model Considering Repeat-Purchase
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Forecasting the Evolution of Demand for the Large Sized Television of Next Generation Using Choice-Based Diffusion Models
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