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Orthopantomogram과 45' 측모두부 방사선 사진과의 구치부 치근평행도의 신뢰도에 관한 비교연구

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 (A) comparative study on reliability of the root parallelism of the posterior teeth projected on the orthopantomogram with the 45' oblique cephalogram 
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[한글] 현재 많은 교정의들이 진단 및 치료계획, 치료후 안정성에 있어서 구치부의 치근평행도를 중요시하고 있는데, 이를 평가하기 위하여 orthopantomogram을 많이 이용하고 있다 이에 본 연구에서 연세대학교 재학생중 전신건강이 양호하고 안모가 단정한 자로서 구강검사시 견치, 제 1소구치, 제 2소구치, 제 1대구치, 제 2대구치에 crowding 및 tipping등에 의한 치관치축 변위가 없고 발치경험이 없으며 (제 3대구치 제외) 견치 및 제 1대구치가 Angle씨 제 1급 교합관계를 갖는자 97명을 대상으로. orthopantomogram에 나타난 구치부 치근평행도의 신뢰도를 45° 측모두부방사선 사진과 비교하여 평가한 결과 다음과 같은 결론을 얻었다. 1. 45° 측모두부방사선 사진과 orthopantomogram에서의 각도 계측치 차이를 5°와 비교했을 때, 교합평면보다 하악평면에 대한 각도 계측치가 5°이하의 차이를 보이는 항목이 유의성이 있게 더 적었다. 2, 45° 측모두부방사선 사진과 orthopantomogram간의 치근평행도 비교시 1%유의수준에서의 유의성 검정결과 상악 견치와 제 1소구치, 하악 견치와 제 1소구치, 하악 제 1소구치와 제 2소구치 및 하악 우측 제 2대구치와 제 3대구치간의 치근평행도에 대해서만 통계적 유의차가 인정되었다. 3. 두 필름간의 치근평행도 차이를 5°에 대해 양측 가설검정을 시행한 결과 하악 우측 제2대구치와 제 3대구치간의 치근 평행도에서는 다소 큰 차이를 나타냈고, 하악 견치와 제 1소구치간의 치근평행도에서 5°보다 약간 큰 차이를 보였을 뿐 나머지 부위에서는 5°보다 작은 차이를 보였다. 4. 하악 견치와 제 1소구치간이 치근 배열에서는 45° 측모두부방사선 사진에서는 서로 convergent한 반면, orthopantomogram에서는 divergent하게 나타났다. 나머지 부위에서 는 두 필름에서 모두 상악은 convergent, 하악은 divergent한 치근의 배열을 보였다
[영문] Ependymal calls line the surface of cerebral ventricles. They do not regenerate after they are fully matured and have a limited response to injury. In hydrocephalus, the expansile farce of the ventricular wall is applied to ependymal cells and causes cell deformity to some degree. As it is sown that the intermediate filaments of a cell act as a framework that resists changes in cellular shape, there may be some detectable changes of intermediate filaments of ependymal cells in hydrocephalus. In developing ependymal cells, it is also unclear if there are any changes in intermediate filalnents in hydrocephalus. Developing ependymal cells are known to lose their immunoreactivity to glial fibrillary acidic protein(GFAP), a kind of intermediate filaments which exist in some neuroglial cells. Congenital and postnatal hydrocephalus were experimentally induced and the changes of immunoreactivity against GFAP as well as the ultrastructures of rat ependymal cells were investigated in both types of hydrocephalus. To induce congenital hydrocephalus,40 mg/kg of ethylenethiourea(ETU) was orally administered to pregnant rats on the 15th day after conception. Tissues talon from fetuses on the 17th day, from newborn rats immediately after birth, and from rats of 1 week and 2 weeks after birth were obtained and processed for immune-histochemistry for GFAP and electron microscopy. Postnatal hydrocephalus was induced by injecting kaolin suspension into the subarachnoid space of 15-day-old rats. Ependymal tissues were obtained and processed for immunohigtochemistry and electron microscopy after 1 and 2 weeks following injection. The results were as follows; 1. Congenital hydrocephalus was induced more consistently and extensively than postnatal hydrocephalus. 2. In congenital hydrocephalus, GFAP-reactive ependymal cells were found in lateral ventricles of 1-week and 2-week-old rats, while in control and postnatal hydrocephalic groups, GFAP-reactive ependymal cells were not found. GFAP-reactive cells tended to be found in clusters. 3. Electron microscopy showed erendymal cells in congenital hydrocephalus had a less marked flattening figure, scarce apical cilia, often widened regions in the intercellular gap, spaces in subependymal tissue, and different figures in mitochondria. Above all, intermediate filaments, including GFAP, increased and were irregularly arranged in ependymal cell cytoplasm in congenital hydrocephalus. Therefore, in congenitally-induced hydrocephalus, the ependymal cells were exposed to the elevated pressure before full development and appeared to have an ability to resist the pressure by synthesizing intermediate filaments.
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2. College of Dentistry (치과대학) > Dept. of Advanced General Dentistry (통합치의학과) > 2. Thesis
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