• Title, Summary, Keyword: Crowned Surface

Search Result 5, Processing Time 0.022 seconds

The construction of a crowned surface (크라운 곡면 형성)

  • Kim, Hoi-Sub
    • Journal of the Korean Society for Industrial and Applied Mathematics
    • /
    • v.10 no.2
    • /
    • pp.49-52
    • /
    • 2006
  • Theses days, the thickness of Brown tube becomes thinner since the display products are rapidly replaced by PDP, LCD etc. Accordingly, the shadow mask part also become flat. We propose the method of designing the surface with crown since the flat surface is fragile to vibration and shock.

  • PDF

EVALUATION OF CONSERVATIVE TREATMENT BETWEEN AMALGAM FILLING AND STAINLESS STEEL CROWN IN PRIMARY TEETH. (乳齒(유치)에 있어서 Stainless steel crown Amalgam과 充塡(충전)과의 비교연구(比較硏究))

  • Woo, Won-Sup
    • JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY
    • /
    • v.4 no.1
    • /
    • pp.35-38
    • /
    • 1977
  • The study was performed to evaluate effects of Conservative treatment between amalgam filling and stainless steel crown. The selected subjects for this study was 350 children who have amalgam filling or stainless steel crown. The obtained results are as followings. 1. In amalgam filling teeth, 120 teeth (60.0%) showed marginal leakage, 57 teeth (28.5%) showed fracture of filling material and 28 teeth (14.0%) teeth showed periapical lesion. 2. In crowned teeth, 6 teeth (3.0%) showed hole on the surface of crown, 29 teeth (14.5%) showed avulsion of crown and 10 teeth (5.0%) showed periapical lesion. 3. After 12 months from examining date, 69 teeth (34.5%) showed sound condition in amalgam filling teeth and 155 teeth (75.2%) showed sound condition in crowned teeth.

  • PDF

Cholangiocarcinoma and Cloacal Prolapse in a Yellow-crowned Amazon Parrot (Amazona ocrocephala) (아마존앵무에서 병발한 담관암종과 총배설강 탈출증)

  • Kim, Ji-Yong;Park, Jun-Won;Kwon, Soo-Wahn;Oh, Suk-Hun;Choi, Yoon-Ju;Kim, Dae-Yong;Shin, Nam-Shik
    • Journal of Veterinary Clinics
    • /
    • v.26 no.5
    • /
    • pp.511-513
    • /
    • 2009
  • This report deals with a 3-year-old male Yellow-crowned Amazon (Amazona orcrocephala) that died after twenty five days history of cloacal prolapse. On necropsy, multiple to occasionally coalescing well-demarcated tan nodules were scattered throughout the entire liver lobes. The nodules were firm and slightly elevated from the surface. The neoplastic nodules were also recognized on cut sections of the liver. Histologically, the nepatic nodules consisted of cuboidal to low columnar cells forming tubular to acinar pattern with marked desmoplasia. The neoplastic cells had small to moderate amounts of eosinophilic cytoplasm and round nucleus with one to two prominent nucleoli. Based on these results, hepatic nodules was diagnosed as primary cholangiocellular carcinoma.

Morphological Study of the Horsehair Worm, Chordodes koreensis (Nematomorpha: Gordiida), Isolated in Canine Vomitus (개의 구토물에서 분리한 오디흑연가시(철선충)의 형태학적 연구)

  • Son, Hwa-Young;Chae, Joon-Seok;Kim, Hyeon-Cheol;Park, Bae-Keun
    • Journal of Veterinary Clinics
    • /
    • v.26 no.4
    • /
    • pp.348-352
    • /
    • 2009
  • This report deals with the morphology of the horsehair worm isolated in canine vomitus. We received a worm in living status. The worm was investigated by using light and scanning electron microscopy (SEM) for species determination. Grossly, the worm was blackish brown in color and 215 mm in length and 1.2 mm in maximum width. Microscopically, the worm was composed of epicuticle, cuticle, epidermis, muscle, mesenchyme, pseudocoel, nerve cord and gut. But the genital organ was not developed. The SEM study revealed that the cuticle contains five types of elevated structures called areoles. The cuticular surface of the parasite is covered by an abundant type of areoles: simple areole, tubercle areole, bulging areole, crowned areole, circumcluster areole. The observed characteristics of the specimen in this study are same to those of genus Chordodes. And we concluded that it is a male of Chordodes koreensis belong to Gordiida. Only nine species of freshwater Nematomorpha are known from Korea, two of which belong to the genus Chordodes. But the case of parasitic horsehair worm in dogs do not recorded, and this is a first gordiosis of dog in Korea.

A STUDY ON MARGINAL ADAPTATION OF READY-MADE STAINLESS STEEL CROWN TO THE PRIMARY MOLAR (기성금관수복 유구치의 변연 적합도에 관한 연구)

  • Lee, Sun-Kyung;Lee, Gwang-Su;Kim, Chong-Chul
    • JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY
    • /
    • v.23 no.2
    • /
    • pp.389-400
    • /
    • 1996
  • In Class II amalgam restoration in deciduous molar, failure rate and incidence of recurrent caries are high as children become older. In order to preserve deciduous molars till the physiologic exfoliation time, stainless steel crown is a choice of the treatment. As a result of a careless treatment, such as overhanging margin, poor marginal adaptation, poor proximal contour and inadequate mesiodistal width give rise to interfering eruption of the adjacent teeth, recurrent caries and chronic gingival irritation and insufficient arch length respectively. In this study, 252 s.s. crowned teeth extracted due to physiologic exfoliation or periapical lesion. The purpose of this study is to analyze the marginal adaptation of stainless steel crown to the deciduous molar in order to obtain better clinical result. The results were as follows : 1. Between the length of s.s. crown and the marginal gap of crown, positive correlations were shown. 2. Largest amount of marginal gap was shown at buccal side in upper deciduous molars and lower first deciduous molar, lingual side in lower second deciduous molar. But no significant diffrence were found statistically compared to second most largest one. 3. Incidence of exposed restoration and recurrent caries were higher in proximal surface than buccal/lingual surface. And extension of restoration below the margin of s.s. crown gives rise to higher rate of recurrent caries. 4. Defect of contour was found in 34%, frequently found in lower 1st deciduous molar and upper 1st deciduous molar. 5. Marginal polishing defects were found in 23%. 6. Ledge was formed in 10% especially in lower 1st deciduous molar and lower 2nd deciduous molar. 7. 16% of the teeth had wear facet due to traumatic occlusion, 7% of them had occlusal perforation.

  • PDF