摘要:

Abstract.Hyaline bodies in odontogenic cysts were studied in the electron microscope after retrieval from paraffin blocks. Although epithelial preservation was poor, hyaline bodies appeared to be well preserved. Our observations do not support unequivocally either of the two major hypotheses of pathogenesis ‐ epithelial cell production or hematogenous origin. Electron micrographs do, however, clearly demonstrate that hyaline bodies are not composed of keratin. Hyaline bodies in our material reveal no ultrastructural similarity to the published electron micrographs of cuticle “B” which Listgarten (1966a, b) suggested corresponds to the secondary enamel cu

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1974.tb01692.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

Abstract.Intact tooth enamel of extracted human teeth was exposed to a pulsed Nd‐YAG laser at an energy density of 10 to 20 joules/cm2.In vitrodemineralization by lactic acid was accomplished by dextran‐producing strains ofStreptococcus mutatisPK‐1 growing on the enamel surface. Scanning electron microscopic observations on the laser irradiated enamel supported micro‐radiographic findings and indicated that the laser irradiated enamel surface was more resistant to decalcification than the non‐irradiated control enamel. Surface changes suggestive of fusion occurred at the low energy density of 10 to 20 joules/cm2. Laser beam irradiation imparted a degree of alteration to enamel surface that subsequently reduced subsurface demineralization. A significant difference in solubility was found between laser irradiated and non‐irradi

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1974.tb01693.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

Abstract.The case history is presented of a patient in whom palatal pigmentation developed following prolonged treatment with amodioquine (camoquin) for systemic lupus erythematosus. In the past there has been dubiety about the nature of the pathological pigmentation in such cases. Light microscopic investigations gave the usual staining reactions for melanin, and ultrastructural studies confirmed that melanin was present in the epithelium and in macrophages in the underlying connective tissues.

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1974.tb01694.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

Abstract.Cytotoxicity of pooled extracts from bacterial plaque was demonstrated by inoculating organ cultures of fetal rat masticatory mucosa. Advanced cytotoxic reactions were characterized by pyknosis, karyorrehexis, hyperkeratosis and possible acantholysis. Histochemical microscopy indicated possible alteration in Krebs cycle function and an increased anaerobic metabolism. Quantitative histochemistry demonstrated a statistically significant increase in total lactic dehydrogenase, glucose‐6‐phosphalc dehydrogenase and acid phosphatase in test explants when compared to controls. Test explants also exhibited a significant decrease in malic and isocitric dehydrogenase activit

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1974.tb01695.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

Abstract.Organ cultures of fetal rat masticatory mucosa inoculated with pooled extracts from bacterial plaque were examined by electron microscopy. In contrast to controls, the test group exhibited pronounced tissue and cellular degeneration, e.g., abnormally wide intercellular spaces, disruption of the basal lamina, vacuolation of the cytoplasm and degeneration of various cytoplasmic organelles.

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1974.tb01696.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY