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유성견에서 상악골 급속확장 후 정중구개봉합부에서의 골조직 변화
박창욱,윤영주,김광원 朝鮮大學校 口腔生物學硏究所 1997 Oral Biology Research (Oral Biol Res) Vol.21 No.2
Rapid palatal expansion(RPE) is a method of inducing the new bone formation in the palate by seperation of the midpalatal suture, which can be done conveniently by placing heavy force across the maxillary dental arch. This experiment was undertaken to examine the histologic changes after RPE and during retention period. Four young adult dogs(a control dog, three experimental dogs) aged 4 to 6 months old were used for this experiment. Expansion screw(Hyrax^R, Dentarum Inc.) was delivered to the palate and turned 180 degrees every morning and evening for 8 days, giving a total expansion of 7.2㎜. A control dog was sacrified at the starting point of this study without any treatment and three experimental dogs were sacrified after RPE, 14-day retention, and 28-day retention in each. Thereafter, those samples were observed with hematoxylin-eosin(H-E) stain, ground section(Villanueva stain), alkaline phosphatase(ALP)stain, tartrate-resistant acid phosphatase(TRAP) stain. The results were as followings: 1. After RPE, collagen fiber bundles were stretched along the midpalatal suture and few osteoblasts were flattened-inactive state and also, a little osteoid tissues was observed. Few multinucleated osteoclasts which had TRAP-positive activity in their cytoplasm were seen in horizontal section, whereas a few osteoclasts were seen in frontal section, especially in the nasal floor side of palatal bone. 2. After 14-day retention, collagen fiber bundles were stretched along the midpalatal suture and a few osteoblasts which ALP-positive activity in their cytoplasm were cuboidal shape. Few multinucleated osteoclasts which had TRAP-positive activity in their cytoplasm were seen in horizontal section, whereas a few osteoclasts were seen in frontal section, especially in the nasal floor side of palatal bone. 3. After 28-day retention, collagen fiber bundles were arranged like those of control dog and osteoblasts which showed a lot of immature bone formation were cuboidal shape and exhibited ALP-positive activity in there cytoplasm. Few multinucleated osteoclasts which had TRAP-positive activity in their cytoplasm were seen in horizontal section, whereas a few osteoclasts were seen in frontal section, expecially in the nasal floor side of palatal bone. According to the above results, the new bone formation after rapid palatal expansion was examined after 14-day retention and significantly increased after 28-day retention.
박창욱,윤석헌 대한건축학회지회연합회 2007 대한건축학회지회연합회 학술발표대회논문집 Vol.2007 No.1
It is seen the construction project which comes to be constructed recently. It gradually is a tendency which becomes highly, largely and complicatedly. The important gradually increase the hoisting, specially case of skyscraper construction of the city center area from smallness one space to ascend with the upper floors it is gradually augmented. It develops the automatic hoisting technology of the tower crane which uses a radio frequency identification from in automation technique. Like this research to lead the work efficiency of the tower crane and safety of worker come to be high.