摘要:

Abstract.Our patient's initial biopsy of the right fibula was diagnosed as Ewing's sarcoma and surgical amputation was suggested as the treatment of choice. After he refused, he was treated with chemotherapy and radiotherapy. The patient refused to continue this type of therapy after a 6 weeks' regimen.The supraorbital swelling occurred 3 years later and the biopsy of it also revealed Ewing's sarcoma, as did the mandibular specimen.The patient, again, refused any further treatment.

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1979.tb01834.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract.An unusually large and old ameloblastoma, which revealed a diverse histological appearance, was studied by light and electron microscopy. In the tumor, the epithelial component formed several patterns in the collagenous stroma. The epithelial islands, consisting of tall columnar cells surrounding the inner core of stellate cells, mimicked the cells of the inner enamel epithelium and stellate reticulum, respectively, of the normal enamel organ. The ultrastructural appearances of the columnar cells, however, were only similar to those which are seen in undifferentiated preameloblasts. Areas of squamous metaplasia were present, and these squamous cells were structurally similar to the cells al the base of the oral epithelium. Some epithelial cells containing numerous lipid granules and mitochondria formed a network of cords. The connective tissue stroma was made up of fibroblast‐like cells which appear to be metabolically active. In addition, multinucleated giant cells were present in the connective tissue stroma near the epithelial componen

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1979.tb01835.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract.In a system of constant ion activities the rates of F−exchange in enamel, under conditions of exchange alone and remineralization, depended on the concentration of F−in solutions. Acid resistance of surface minerals resulted from exchange of F−for OH−in the enamel at pH 7.0 and 4.5 The leve lof 0.5 mM NaF, compared to 0.05 and 5.0 mM, caused maximum rates of isotopic exchange of45Ca and maximum acid resistance of enamel. Similarly low levels of F−may be feasible for use in caries prevention in the absence and presence of reminer

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1979.tb01836.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract.Histopathological studies were conducted on experimental carcinogenesis in mouse salivary glands using D L‐isoproterenol hydochloride (isoproterenol) and 9 10‐dimethyl‐1 2‐benzantliracene (DMBA). DM BA was admisistered once at 1 mg/0.02 ml in olive oil to the salivary glands, and isoproterenol was injected intraperitoneally at 1 mg/0.05 ml saline solution three times a week for 2 weeks al different periods during the oncogenic process. Salivary glands treated with carcinogen showed a relatively constant sequence of changes and developed epithelial and mesenchymal tumors irrespective of isoproterenol administration. Isoproterenol did not influence the development of another type of tumor; however, it did retard the oncogenic pr

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1979.tb01837.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract.X‐ray diffraction and electron spin resonance (ESR) analyses were conducted on calcifying epithelial odontogenic tumor (CEOT) associated with abundant calcification in order to compare its mineral structure with that of surrounding cortical bone. The material under investigation was removed from the canine‐premolar region of the left maxilla of a 39‐year‐old woman. The principal findings were that the mineral phase of CEOT consists of apatite crystals and that the crystallinity of the crystals is higher than that of bone apatite. ESR spectra of CEOT are similar to those of bone sample. Quantitative ESR analysis indicates that CEOT shows a higher crystallinity coefficient – defined by Ostrowski et al. (1972, 1974) as the ratio of spin concentration to the ash content of the sample – than bone. Based on the data, it can be concluded that the calcification in CEOT has a higher crystalline structure than the co

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1979.tb01838.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract.The oral findings in two Peruvian brothers, 10‐ and 11‐years‐old, with acatalasia are presented. Gingival necrosis and severe alveolar bone destruction were the main oral manifestations. Otherwise the patients were in good health. Thirteen hypocatalasemic individuals, including both parents, were found among 29 relatives of the probands examined from four generations. No other acatalasemic individuals were found. Hypocatalectic relatives of the probands did not have oral lesions, and no other abnormalities were detected. The parents of the affected children were not known to be related; however, both parents and their families come from the same small rural community. The inheritance pattern in the kindred was compatible with an autosomal recessive disorder. It is postulated that the gingival lesions resulted from damage to tissue from hydrogen peroxide generated by organisms in gingival plaque. The hydrogen peroxide cannot be degraded by gingival tissue or by leukocytes genetically lacking the enzyme cat

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1979.tb01839.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract.A feature of radicular cyst histology is the observation that polymorphonuclear leucocytes infiltrate the epithelium whereas chronic inflammatory cells do not and accumulate in the sub‐epithelial connective tissue. Material for the study of this phenomenon consisted of radicular cysts fixed in formol saline. Observation under the SEM indicated that the lumenal surface of the radicular cyst is characterized by numerous interepithelial spaces through which polymorphonuclear cells reach the cyst cavity. The cells on the lumenal surface are associated with interepithelial spaces. Observations of the cut surface indicate that channels occur between epithelial cells through which the polymorphonuclear leucocytes migrate. The channels may also be a pathway for exudates from capillaries to reach the cyst cavity and provide a means for radicular cyst enlargement. Erosions of epithelial cells and features of necrosis of superficial cells were observed. Thus it appears that polymorphonuclear leucocytes migrate through definite channels between epithelial cells in the radicular cyst lining, the chemotactic stimulus being degeneration and breakdown of the superficial epithelial cell

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1979.tb01840.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Book reviews in this article:Principles and Techniques of Scanning Electron Microscopy: Biological Applications, Vol, 6, ed. Hayat, M. A.

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1979.tb01841.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

ISSN:0904-2512    

DOI:10.1111/j.1600-0714.1979.tb01842.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY